vendor: github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353

full diff:

- https://github.com/moby/buildkit/compare/20230620112432...v0.12.0
- https://github.com/moby/buildkit/compare/v0.12.0...faa0cc7da3536923d85b74b2bb2d13c12a6ecc99

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

go.mod

@@ -23,7 +23,7 @@ require (
 	github.com/google/uuid v1.3.0
 	github.com/hashicorp/go-cty-funcs v0.0.0-20200930094925-2721b1e36840
 	github.com/hashicorp/hcl/v2 v2.8.2
-	github.com/moby/buildkit v0.11.0-rc3.0.20230620112432-2d91ddcceedc
+	github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353 // v0.12.1-dev
 	github.com/moby/sys/mountinfo v0.6.2
 	github.com/moby/sys/signal v0.7.0
 	github.com/morikuni/aec v1.0.0
@@ -76,6 +76,7 @@ require (
 	github.com/cenkalti/backoff/v4 v4.2.0 // indirect
 	github.com/cespare/xxhash/v2 v2.2.0 // indirect
 	github.com/cloudflare/cfssl v0.0.0-20181213083726-b94e044bb51e // indirect
+	github.com/containerd/ttrpc v1.2.2 // indirect
 	github.com/cyphar/filepath-securejoin v0.2.3 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/distribution/distribution/v3 v3.0.0-20230214150026-36d8c594d7aa // indirect

go.sum

@@ -136,6 +136,7 @@ github.com/containerd/nydus-snapshotter v0.8.2 h1:7SOrMU2YmLzfbsr5J7liMZJlNi5WT6
 github.com/containerd/stargz-snapshotter v0.14.3 h1:OTUVZoPSPs8mGgmQUE1dqw3WX/3nrsmsurW7UPLWl1U=
 github.com/containerd/stargz-snapshotter/estargz v0.14.3 h1:OqlDCK3ZVUO6C3B/5FSkDwbkEETK84kQgEeFwDC+62k=
 github.com/containerd/ttrpc v1.2.2 h1:9vqZr0pxwOF5koz6N0N3kJ0zDHokrcPxIR/ZR2YFtOs=
+github.com/containerd/ttrpc v1.2.2/go.mod h1:sIT6l32Ph/H9cvnJsfXM5drIVzTr5A2flTf1G5tYZak=
 github.com/containerd/typeurl/v2 v2.1.1 h1:3Q4Pt7i8nYwy2KmQWIw2+1hTvwTE/6w9FqcttATPO/4=
 github.com/containerd/typeurl/v2 v2.1.1/go.mod h1:IDp2JFvbwZ31H8dQbEIY7sDl2L3o3HZj1hsSQlywkQ0=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
@@ -269,6 +270,7 @@ github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.6/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.8/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
@@ -370,8 +372,8 @@ github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 h1:DpOJ2HYzC
 github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7/go.mod h1:ZXFpozHsX6DPmq2I0TCekCxypsnAUbP2oI0UX1GXzOo=
 github.com/mitchellh/mapstructure v1.5.0 h1:jeMsZIYE/09sWLaz43PL7Gy6RuMjD2eJVyuac5Z2hdY=
 github.com/mitchellh/mapstructure v1.5.0/go.mod h1:bFUtVrKA4DC2yAKiSyO/QUcy7e+RRV2QTWOzhPopBRo=
-github.com/moby/buildkit v0.11.0-rc3.0.20230620112432-2d91ddcceedc h1:79EnLqFEkPn6sTBXDHE546AHmYeb/QzXgGyIpli8w34=
+github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353 h1:/ZIwqvOF3QKObJbjX96xVvAKtnWdw/AuEqysbbujaZA=
-github.com/moby/buildkit v0.11.0-rc3.0.20230620112432-2d91ddcceedc/go.mod h1:6Y1HYDrxg3sY5gBY2FVaEvQpswBj3g/ck7aKYCjOkk0=
+github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353/go.mod h1:+n9GmkxwBCjVz4u7wmiyh+oqvjIjQM+1zk3iJrWfdos=
 github.com/moby/locker v1.0.1 h1:fOXqR41zeveg4fFODix+1Ch4mj/gT0NE1XJbp/epuBg=
 github.com/moby/locker v1.0.1/go.mod h1:S7SDdo5zpBK84bzzVlKr2V0hz+7x9hWbYC/kq7oQppc=
 github.com/moby/patternmatcher v0.5.0 h1:YCZgJOeULcxLw1Q+sVR636pmS7sPEn1Qo2iAN6M7DBo=
@@ -436,6 +438,7 @@ github.com/prometheus/common v0.42.0/go.mod h1:xBwqVerjNdUDjgODMpudtOMwlOwf2SaTr
 github.com/prometheus/procfs v0.0.0-20181005140218-185b4288413d/go.mod h1:c3At6R/oaqEKCNdg8wHV1ftS6bRYblBhIjjI8uT2IGk=
 github.com/prometheus/procfs v0.0.2/go.mod h1:TjEm7ze935MbeOT/UhFTIMYKhuLP4wbCsTZCD3I8kEA=
 github.com/prometheus/procfs v0.0.3/go.mod h1:4A/X28fw3Fc593LaREMrKMqOKvUAntwMDaekg4FpcdQ=
+github.com/prometheus/procfs v0.6.0/go.mod h1:cz+aTbrPOrUb4q7XlbU9ygM+/jj0fzG6c1xBZuNvfVA=
 github.com/prometheus/procfs v0.9.0 h1:wzCHvIvM5SxWqYvwgVL7yJY8Lz3PKn49KQtpgMYJfhI=
 github.com/prometheus/procfs v0.9.0/go.mod h1:+pB4zwohETzFnmlpe6yd2lSc+0/46IYZRB/chUwxUZY=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
@@ -453,6 +456,7 @@ github.com/shibumi/go-pathspec v1.3.0 h1:QUyMZhFo0Md5B8zV8x2tesohbb5kfbpTi9rBnKh
 github.com/shibumi/go-pathspec v1.3.0/go.mod h1:Xutfslp817l2I1cZvgcfeMQJG5QnU2lh5tVaaMCl3jE=
 github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPxbbu5VWo=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/sirupsen/logrus v1.9.0 h1:trlNQbNUG3OdDrDil03MCb1H2o9nJ1x4/5LYw7byDE0=
 github.com/sirupsen/logrus v1.9.0/go.mod h1:naHLuLoDiP4jHNo9R0sCBMtWGeIprob74mVsIT4qYEQ=
 github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
@@ -633,6 +637,7 @@ golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.2.0 h1:PUR+T4wwASmuSTYdKjYHI5TD22Wy5ogLU5qZCOLxBrI=
 golang.org/x/sync v0.2.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -650,6 +655,7 @@ golang.org/x/sys v0.0.0-20190624142023-c5567b49c5d0/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20190801041406-cbf593c0f2f3/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191001151750-bb3f8db39f24/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191204072324-ce4227a45e2e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -674,6 +680,7 @@ golang.org/x/sys v0.0.0-20210616094352-59db8d763f22/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
 golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

vendor/github.com/containerd/containerd/identifiers/validate.go

@@ -0,0 +1,73 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+// Package identifiers provides common validation for identifiers and keys
+// across containerd.
+//
+// Identifiers in containerd must be a alphanumeric, allowing limited
+// underscores, dashes and dots.
+//
+// While the character set may be expanded in the future, identifiers
+// are guaranteed to be safely used as filesystem path components.
+package identifiers
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/containerd/containerd/errdefs"
+)
+
+const (
+	maxLength  = 76
+	alphanum   = `[A-Za-z0-9]+`
+	separators = `[._-]`
+)
+
+var (
+	// identifierRe defines the pattern for valid identifiers.
+	identifierRe = regexp.MustCompile(reAnchor(alphanum + reGroup(separators+reGroup(alphanum)) + "*"))
+)
+
+// Validate returns nil if the string s is a valid identifier.
+//
+// identifiers are similar to the domain name rules according to RFC 1035, section 2.3.1. However
+// rules in this package are relaxed to allow numerals to follow period (".") and mixed case is
+// allowed.
+//
+// In general identifiers that pass this validation should be safe for use as filesystem path components.
+func Validate(s string) error {
+	if len(s) == 0 {
+		return fmt.Errorf("identifier must not be empty: %w", errdefs.ErrInvalidArgument)
+	}
+
+	if len(s) > maxLength {
+		return fmt.Errorf("identifier %q greater than maximum length (%d characters): %w", s, maxLength, errdefs.ErrInvalidArgument)
+	}
+
+	if !identifierRe.MatchString(s) {
+		return fmt.Errorf("identifier %q must match %v: %w", s, identifierRe, errdefs.ErrInvalidArgument)
+	}
+	return nil
+}
+
+func reGroup(s string) string {
+	return `(?:` + s + `)`
+}
+
+func reAnchor(s string) string {
+	return `^` + s + `$`
+}

vendor/github.com/containerd/containerd/leases/context.go

@@ -0,0 +1,40 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package leases
+
+import "context"
+
+type leaseKey struct{}
+
+// WithLease sets a given lease on the context
+func WithLease(ctx context.Context, lid string) context.Context {
+	ctx = context.WithValue(ctx, leaseKey{}, lid)
+
+	// also store on the grpc headers so it gets picked up by any clients that
+	// are using this.
+	return withGRPCLeaseHeader(ctx, lid)
+}
+
+// FromContext returns the lease from the context.
+func FromContext(ctx context.Context) (string, bool) {
+	lid, ok := ctx.Value(leaseKey{}).(string)
+	if !ok {
+		return fromGRPCHeader(ctx)
+	}
+
+	return lid, ok
+}

vendor/github.com/containerd/containerd/leases/grpc.go

@@ -0,0 +1,58 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package leases
+
+import (
+	"context"
+
+	"google.golang.org/grpc/metadata"
+)
+
+const (
+	// GRPCHeader defines the header name for specifying a containerd lease.
+	GRPCHeader = "containerd-lease"
+)
+
+func withGRPCLeaseHeader(ctx context.Context, lid string) context.Context {
+	// also store on the grpc headers so it gets picked up by any clients
+	// that are using this.
+	txheader := metadata.Pairs(GRPCHeader, lid)
+	md, ok := metadata.FromOutgoingContext(ctx) // merge with outgoing context.
+	if !ok {
+		md = txheader
+	} else {
+		// order ensures the latest is first in this list.
+		md = metadata.Join(txheader, md)
+	}
+
+	return metadata.NewOutgoingContext(ctx, md)
+}
+
+func fromGRPCHeader(ctx context.Context) (string, bool) {
+	// try to extract for use in grpc servers.
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		return "", false
+	}
+
+	values := md[GRPCHeader]
+	if len(values) == 0 {
+		return "", false
+	}
+
+	return values[0], true
+}

vendor/github.com/containerd/containerd/leases/id.go

@@ -0,0 +1,43 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package leases
+
+import (
+	"crypto/rand"
+	"encoding/base64"
+	"fmt"
+	"time"
+)
+
+// WithRandomID sets the lease ID to a random unique value
+func WithRandomID() Opt {
+	return func(l *Lease) error {
+		t := time.Now()
+		var b [3]byte
+		rand.Read(b[:])
+		l.ID = fmt.Sprintf("%d-%s", t.Nanosecond(), base64.URLEncoding.EncodeToString(b[:]))
+		return nil
+	}
+}
+
+// WithID sets the ID for the lease
+func WithID(id string) Opt {
+	return func(l *Lease) error {
+		l.ID = id
+		return nil
+	}
+}

vendor/github.com/containerd/containerd/leases/lease.go

@@ -0,0 +1,91 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package leases
+
+import (
+	"context"
+	"time"
+)
+
+// Opt is used to set options on a lease
+type Opt func(*Lease) error
+
+// DeleteOpt allows configuring a delete operation
+type DeleteOpt func(context.Context, *DeleteOptions) error
+
+// Manager is used to create, list, and remove leases
+type Manager interface {
+	Create(context.Context, ...Opt) (Lease, error)
+	Delete(context.Context, Lease, ...DeleteOpt) error
+	List(context.Context, ...string) ([]Lease, error)
+	AddResource(context.Context, Lease, Resource) error
+	DeleteResource(context.Context, Lease, Resource) error
+	ListResources(context.Context, Lease) ([]Resource, error)
+}
+
+// Lease retains resources to prevent cleanup before
+// the resources can be fully referenced.
+type Lease struct {
+	ID        string
+	CreatedAt time.Time
+	Labels    map[string]string
+}
+
+// Resource represents low level resource of image, like content, ingest and
+// snapshotter.
+type Resource struct {
+	ID   string
+	Type string
+}
+
+// DeleteOptions provide options on image delete
+type DeleteOptions struct {
+	Synchronous bool
+}
+
+// SynchronousDelete is used to indicate that a lease deletion and removal of
+// any unreferenced resources should occur synchronously before returning the
+// result.
+func SynchronousDelete(ctx context.Context, o *DeleteOptions) error {
+	o.Synchronous = true
+	return nil
+}
+
+// WithLabels merges labels on a lease
+func WithLabels(labels map[string]string) Opt {
+	return func(l *Lease) error {
+		if l.Labels == nil {
+			l.Labels = map[string]string{}
+		}
+		for k, v := range labels {
+			l.Labels[k] = v
+		}
+		return nil
+	}
+}
+
+// WithExpiration sets an expiration on the lease
+func WithExpiration(d time.Duration) Opt {
+	return func(l *Lease) error {
+		if l.Labels == nil {
+			l.Labels = map[string]string{}
+		}
+		l.Labels["containerd.io/gc.expire"] = time.Now().Add(d).Format(time.RFC3339)
+
+		return nil
+	}
+}

vendor/github.com/containerd/containerd/namespaces/context.go

@@ -0,0 +1,78 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package namespaces
+
+import (
+	"context"
+	"fmt"
+	"os"
+
+	"github.com/containerd/containerd/errdefs"
+	"github.com/containerd/containerd/identifiers"
+)
+
+const (
+	// NamespaceEnvVar is the environment variable key name
+	NamespaceEnvVar = "CONTAINERD_NAMESPACE"
+	// Default is the name of the default namespace
+	Default = "default"
+)
+
+type namespaceKey struct{}
+
+// WithNamespace sets a given namespace on the context
+func WithNamespace(ctx context.Context, namespace string) context.Context {
+	ctx = context.WithValue(ctx, namespaceKey{}, namespace) // set our key for namespace
+	// also store on the grpc and ttrpc headers so it gets picked up by any clients that
+	// are using this.
+	return withTTRPCNamespaceHeader(withGRPCNamespaceHeader(ctx, namespace), namespace)
+}
+
+// NamespaceFromEnv uses the namespace defined in CONTAINERD_NAMESPACE or
+// default
+func NamespaceFromEnv(ctx context.Context) context.Context {
+	namespace := os.Getenv(NamespaceEnvVar)
+	if namespace == "" {
+		namespace = Default
+	}
+	return WithNamespace(ctx, namespace)
+}
+
+// Namespace returns the namespace from the context.
+//
+// The namespace is not guaranteed to be valid.
+func Namespace(ctx context.Context) (string, bool) {
+	namespace, ok := ctx.Value(namespaceKey{}).(string)
+	if !ok {
+		if namespace, ok = fromGRPCHeader(ctx); !ok {
+			return fromTTRPCHeader(ctx)
+		}
+	}
+	return namespace, ok
+}
+
+// NamespaceRequired returns the valid namespace from the context or an error.
+func NamespaceRequired(ctx context.Context) (string, error) {
+	namespace, ok := Namespace(ctx)
+	if !ok || namespace == "" {
+		return "", fmt.Errorf("namespace is required: %w", errdefs.ErrFailedPrecondition)
+	}
+	if err := identifiers.Validate(namespace); err != nil {
+		return "", fmt.Errorf("namespace validation: %w", err)
+	}
+	return namespace, nil
+}

vendor/github.com/containerd/containerd/namespaces/grpc.go

@@ -0,0 +1,61 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package namespaces
+
+import (
+	"context"
+
+	"google.golang.org/grpc/metadata"
+)
+
+const (
+	// GRPCHeader defines the header name for specifying a containerd namespace.
+	GRPCHeader = "containerd-namespace"
+)
+
+// NOTE(stevvooe): We can stub this file out if we don't want a grpc dependency here.
+
+func withGRPCNamespaceHeader(ctx context.Context, namespace string) context.Context {
+	// also store on the grpc headers so it gets picked up by any clients that
+	// are using this.
+	nsheader := metadata.Pairs(GRPCHeader, namespace)
+	md, ok := metadata.FromOutgoingContext(ctx) // merge with outgoing context.
+	if !ok {
+		md = nsheader
+	} else {
+		// order ensures the latest is first in this list.
+		md = metadata.Join(nsheader, md)
+	}
+
+	return metadata.NewOutgoingContext(ctx, md)
+}
+
+func fromGRPCHeader(ctx context.Context) (string, bool) {
+	// try to extract for use in grpc servers.
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		// TODO(stevvooe): Check outgoing context?
+		return "", false
+	}
+
+	values := md[GRPCHeader]
+	if len(values) == 0 {
+		return "", false
+	}
+
+	return values[0], true
+}

vendor/github.com/containerd/containerd/namespaces/store.go

@@ -0,0 +1,44 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package namespaces
+
+import "context"
+
+// Store provides introspection about namespaces.
+//
+// Note that these are slightly different than other objects, which are record
+// oriented. A namespace is really just a name and a set of labels. Objects
+// that belong to a namespace are returned when the namespace is assigned to a
+// given context.
+type Store interface {
+	Create(ctx context.Context, namespace string, labels map[string]string) error
+	Labels(ctx context.Context, namespace string) (map[string]string, error)
+	SetLabel(ctx context.Context, namespace, key, value string) error
+	List(ctx context.Context) ([]string, error)
+
+	// Delete removes the namespace. The namespace must be empty to be deleted.
+	Delete(ctx context.Context, namespace string, opts ...DeleteOpts) error
+}
+
+// DeleteInfo specifies information for the deletion of a namespace
+type DeleteInfo struct {
+	// Name of the namespace
+	Name string
+}
+
+// DeleteOpts allows the caller to set options for namespace deletion
+type DeleteOpts func(context.Context, *DeleteInfo) error

vendor/github.com/containerd/containerd/namespaces/ttrpc.go

@@ -0,0 +1,51 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package namespaces
+
+import (
+	"context"
+
+	"github.com/containerd/ttrpc"
+)
+
+const (
+	// TTRPCHeader defines the header name for specifying a containerd namespace
+	TTRPCHeader = "containerd-namespace-ttrpc"
+)
+
+func copyMetadata(src ttrpc.MD) ttrpc.MD {
+	md := ttrpc.MD{}
+	for k, v := range src {
+		md[k] = append(md[k], v...)
+	}
+	return md
+}
+
+func withTTRPCNamespaceHeader(ctx context.Context, namespace string) context.Context {
+	md, ok := ttrpc.GetMetadata(ctx)
+	if !ok {
+		md = ttrpc.MD{}
+	} else {
+		md = copyMetadata(md)
+	}
+	md.Set(TTRPCHeader, namespace)
+	return ttrpc.WithMetadata(ctx, md)
+}
+
+func fromTTRPCHeader(ctx context.Context) (string, bool) {
+	return ttrpc.GetMetadataValue(ctx, TTRPCHeader)
+}

vendor/github.com/containerd/ttrpc/.gitattributes

@@ -0,0 +1 @@
+*.go text eol=lf

vendor/github.com/containerd/ttrpc/.gitignore

@@ -0,0 +1,13 @@
+# Binaries for programs and plugins
+/bin/
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+coverage.txt

vendor/github.com/containerd/ttrpc/.golangci.yml

@@ -0,0 +1,52 @@
+linters:
+  enable:
+    - staticcheck
+    - unconvert
+    - gofmt
+    - goimports
+    - revive
+    - ineffassign
+    - vet
+    - unused
+    - misspell
+  disable:
+    - errcheck
+
+linters-settings:
+  revive:
+    ignore-generated-headers: true
+    rules:
+      - name: blank-imports
+      - name: context-as-argument
+      - name: context-keys-type
+      - name: dot-imports
+      - name: error-return
+      - name: error-strings
+      - name: error-naming
+      - name: exported
+      - name: if-return
+      - name: increment-decrement
+      - name: var-naming
+        arguments: [["UID", "GID"], []]
+      - name: var-declaration
+      - name: package-comments
+      - name: range
+      - name: receiver-naming
+      - name: time-naming
+      - name: unexported-return
+      - name: indent-error-flow
+      - name: errorf
+      - name: empty-block
+      - name: superfluous-else
+      - name: unused-parameter
+      - name: unreachable-code
+      - name: redefines-builtin-id
+
+issues:
+  include:
+    - EXC0002
+
+run:
+  timeout: 8m
+  skip-dirs:
+    - example

vendor/github.com/containerd/ttrpc/LICENSE

@@ -0,0 +1,201 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
+      and conversions to other media types.
+
+      "Work" shall mean the work of authorship, whether in Source or
+      Object form, made available under the License, as indicated by a
+      copyright notice that is included in or attached to the work
+      (an example is provided in the Appendix below).
+
+      "Derivative Works" shall mean any work, whether in Source or Object
+      form, that is based on (or derived from) the Work and for which the
+      editorial revisions, annotations, elaborations, or other modifications
+      represent, as a whole, an original work of authorship. For the purposes
+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
+
+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
+      the copyright owner. For the purposes of this definition, "submitted"
+      means any form of electronic, verbal, or written communication sent
+      to the Licensor or its representatives, including but not limited to
+      communication on electronic mailing lists, source code control systems,
+      and issue tracking systems that are managed by, or on behalf of, the
+      Licensor for the purpose of discussing and improving the Work, but
+      excluding communication that is conspicuously marked or otherwise
+      designated in writing by the copyright owner as "Not a Contribution."
+
+      "Contributor" shall mean Licensor and any individual or Legal Entity
+      on behalf of whom a Contribution has been received by Licensor and
+      subsequently incorporated within the Work.
+
+   2. Grant of Copyright License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      copyright license to reproduce, prepare Derivative Works of,
+      publicly display, publicly perform, sublicense, and distribute the
+      Work and such Derivative Works in Source or Object form.
+
+   3. Grant of Patent License. Subject to the terms and conditions of
+      this License, each Contributor hereby grants to You a perpetual,
+      worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+      (except as stated in this section) patent license to make, have made,
+      use, offer to sell, sell, import, and otherwise transfer the Work,
+      where such license applies only to those patent claims licensable
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+      institute patent litigation against any entity (including a
+      cross-claim or counterclaim in a lawsuit) alleging that the Work
+      or a Contribution incorporated within the Work constitutes direct
+      or contributory patent infringement, then any patent licenses
+      granted to You under this License for that Work shall terminate
+      as of the date such litigation is filed.
+
+   4. Redistribution. You may reproduce and distribute copies of the
+      Work or Derivative Works thereof in any medium, with or without
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+      meet the following conditions:
+
+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
+
+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
+
+      (c) You must retain, in the Source form of any Derivative Works
+          that You distribute, all copyright, patent, trademark, and
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+          excluding those notices that do not pertain to any part of
+          the Derivative Works; and
+
+      (d) If the Work includes a "NOTICE" text file as part of its
+          distribution, then any Derivative Works that You distribute must
+          include a readable copy of the attribution notices contained
+          within such NOTICE file, excluding those notices that do not
+          pertain to any part of the Derivative Works, in at least one
+          of the following places: within a NOTICE text file distributed
+          as part of the Derivative Works; within the Source form or
+          documentation, if provided along with the Derivative Works; or,
+          within a display generated by the Derivative Works, if and
+          wherever such third-party notices normally appear. The contents
+          of the NOTICE file are for informational purposes only and
+          do not modify the License. You may add Your own attribution
+          notices within Derivative Works that You distribute, alongside
+          or as an addendum to the NOTICE text from the Work, provided
+          that such additional attribution notices cannot be construed
+          as modifying the License.
+
+      You may add Your own copyright statement to Your modifications and
+      may provide additional or different license terms and conditions
+      for use, reproduction, or distribution of Your modifications, or
+      for any such Derivative Works as a whole, provided Your use,
+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
+      except as required for reasonable and customary use in describing the
+      origin of the Work and reproducing the content of the NOTICE file.
+
+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+      implied, including, without limitation, any warranties or conditions
+      of TITLE, NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A
+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
+
+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
+      incidental, or consequential damages of any character arising as a
+      result of this License or out of the use or inability to use the
+      Work (including but not limited to damages for loss of goodwill,
+      work stoppage, computer failure or malfunction, or any and all
+      other commercial damages or losses), even if such Contributor
+      has been advised of the possibility of such damages.
+
+   9. Accepting Warranty or Additional Liability. While redistributing
+      the Work or Derivative Works thereof, You may choose to offer,
+      and charge a fee for, acceptance of support, warranty, indemnity,
+      or other liability obligations and/or rights consistent with this
+      License. However, in accepting such obligations, You may act only
+      on Your own behalf and on Your sole responsibility, not on behalf
+      of any other Contributor, and only if You agree to indemnify,
+      defend, and hold each Contributor harmless for any liability
+      incurred by, or claims asserted against, such Contributor by reason
+      of your accepting any such warranty or additional liability.
+
+   END OF TERMS AND CONDITIONS
+
+   APPENDIX: How to apply the Apache License to your work.
+
+      To apply the Apache License to your work, attach the following
+      boilerplate notice, with the fields enclosed by brackets "[]"
+      replaced with your own identifying information. (Don't include
+      the brackets!)  The text should be enclosed in the appropriate
+      comment syntax for the file format. We also recommend that a
+      file or class name and description of purpose be included on the
+      same "printed page" as the copyright notice for easier
+      identification within third-party archives.
+
+   Copyright [yyyy] [name of copyright owner]
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.

vendor/github.com/containerd/ttrpc/Makefile

@@ -0,0 +1,180 @@
+#   Copyright The containerd Authors.
+
+#   Licensed under the Apache License, Version 2.0 (the "License");
+#   you may not use this file except in compliance with the License.
+#   You may obtain a copy of the License at
+
+#       http://www.apache.org/licenses/LICENSE-2.0
+
+#   Unless required by applicable law or agreed to in writing, software
+#   distributed under the License is distributed on an "AS IS" BASIS,
+#   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#   See the License for the specific language governing permissions and
+#   limitations under the License.
+
+
+# Go command to use for build
+GO ?= go
+INSTALL ?= install
+
+# Root directory of the project (absolute path).
+ROOTDIR=$(dir $(abspath $(lastword $(MAKEFILE_LIST))))
+
+WHALE = "🇩"
+ONI = "👹"
+
+# Project binaries.
+COMMANDS=protoc-gen-go-ttrpc protoc-gen-gogottrpc
+
+ifdef BUILDTAGS
+    GO_BUILDTAGS = ${BUILDTAGS}
+endif
+GO_BUILDTAGS ?=
+GO_TAGS=$(if $(GO_BUILDTAGS),-tags "$(strip $(GO_BUILDTAGS))",)
+
+# Project packages.
+PACKAGES=$(shell $(GO) list ${GO_TAGS} ./... | grep -v /example)
+TESTPACKAGES=$(shell $(GO) list ${GO_TAGS} ./... | grep -v /cmd | grep -v /integration | grep -v /example)
+BINPACKAGES=$(addprefix ./cmd/,$(COMMANDS))
+
+#Replaces ":" (*nix), ";" (windows) with newline for easy parsing
+GOPATHS=$(shell echo ${GOPATH} | tr ":" "\n" | tr ";" "\n")
+
+TESTFLAGS_RACE=
+GO_BUILD_FLAGS=
+# See Golang issue re: '-trimpath': https://github.com/golang/go/issues/13809
+GO_GCFLAGS=$(shell				\
+	set -- ${GOPATHS};			\
+	echo "-gcflags=-trimpath=$${1}/src";	\
+	)
+
+BINARIES=$(addprefix bin/,$(COMMANDS))
+
+# Flags passed to `go test`
+TESTFLAGS ?= $(TESTFLAGS_RACE) $(EXTRA_TESTFLAGS)
+TESTFLAGS_PARALLEL ?= 8
+
+# Use this to replace `go test` with, for instance, `gotestsum`
+GOTEST ?= $(GO) test
+
+.PHONY: clean all AUTHORS build binaries test integration generate protos check-protos coverage ci check help install vendor install-protobuf install-protobuild
+.DEFAULT: default
+
+# Forcibly set the default goal to all, in case an include above brought in a rule definition.
+.DEFAULT_GOAL := all
+
+all: binaries
+
+check: proto-fmt ## run all linters
+	@echo "$(WHALE) $@"
+	GOGC=75 golangci-lint run
+
+ci: check binaries check-protos coverage # coverage-integration ## to be used by the CI
+
+AUTHORS: .mailmap .git/HEAD
+	git log --format='%aN <%aE>' | sort -fu > $@
+
+generate: protos
+	@echo "$(WHALE) $@"
+	@PATH="${ROOTDIR}/bin:${PATH}" $(GO) generate -x ${PACKAGES}
+
+protos: bin/protoc-gen-gogottrpc bin/protoc-gen-go-ttrpc ## generate protobuf
+	@echo "$(WHALE) $@"
+	@(PATH="${ROOTDIR}/bin:${PATH}" protobuild --quiet ${PACKAGES})
+
+check-protos: protos ## check if protobufs needs to be generated again
+	@echo "$(WHALE) $@"
+	@test -z "$$(git status --short | grep ".pb.go" | tee /dev/stderr)" || \
+		((git diff | cat) && \
+		(echo "$(ONI) please run 'make protos' when making changes to proto files" && false))
+
+check-api-descriptors: protos ## check that protobuf changes aren't present.
+	@echo "$(WHALE) $@"
+	@test -z "$$(git status --short | grep ".pb.txt" | tee /dev/stderr)" || \
+		((git diff $$(find . -name '*.pb.txt') | cat) && \
+		(echo "$(ONI) please run 'make protos' when making changes to proto files and check-in the generated descriptor file changes" && false))
+
+proto-fmt: ## check format of proto files
+	@echo "$(WHALE) $@"
+	@test -z "$$(find . -name '*.proto' -type f -exec grep -Hn -e "^ " {} \; | tee /dev/stderr)" || \
+		(echo "$(ONI) please indent proto files with tabs only" && false)
+	@test -z "$$(find . -name '*.proto' -type f -exec grep -Hn "Meta meta = " {} \; | grep -v '(gogoproto.nullable) = false' | tee /dev/stderr)" || \
+		(echo "$(ONI) meta fields in proto files must have option (gogoproto.nullable) = false" && false)
+
+build: ## build the go packages
+	@echo "$(WHALE) $@"
+	@$(GO) build ${DEBUG_GO_GCFLAGS} ${GO_GCFLAGS} ${GO_BUILD_FLAGS} ${EXTRA_FLAGS} ${PACKAGES}
+
+test: ## run tests, except integration tests and tests that require root
+	@echo "$(WHALE) $@"
+	@$(GOTEST) ${TESTFLAGS} ${TESTPACKAGES}
+
+integration: ## run integration tests
+	@echo "$(WHALE) $@"
+	@cd "${ROOTDIR}/integration" && $(GOTEST) -v ${TESTFLAGS}  -parallel ${TESTFLAGS_PARALLEL} .
+
+benchmark: ## run benchmarks tests
+	@echo "$(WHALE) $@"
+	@$(GO) test ${TESTFLAGS} -bench . -run Benchmark
+
+FORCE:
+
+define BUILD_BINARY
+@echo "$(WHALE) $@"
+@$(GO) build ${DEBUG_GO_GCFLAGS} ${GO_GCFLAGS} ${GO_BUILD_FLAGS} -o $@ ${GO_TAGS}  ./$<
+endef
+
+# Build a binary from a cmd.
+bin/%: cmd/% FORCE
+	$(call BUILD_BINARY)
+
+binaries: $(BINARIES) ## build binaries
+	@echo "$(WHALE) $@"
+
+clean: ## clean up binaries
+	@echo "$(WHALE) $@"
+	@rm -f $(BINARIES)
+
+install: ## install binaries
+	@echo "$(WHALE) $@ $(BINPACKAGES)"
+	@$(GO) install $(BINPACKAGES)
+
+install-protobuf:
+	@echo "$(WHALE) $@"
+	@script/install-protobuf
+
+install-protobuild:
+	@echo "$(WHALE) $@"
+	@$(GO) install google.golang.org/protobuf/cmd/protoc-gen-go@v1.28.1
+	@$(GO) install github.com/containerd/protobuild@14832ccc41429f5c4f81028e5af08aa233a219cf
+
+coverage: ## generate coverprofiles from the unit tests, except tests that require root
+	@echo "$(WHALE) $@"
+	@rm -f coverage.txt
+	@$(GO) test ${TESTFLAGS} ${TESTPACKAGES} 2> /dev/null
+	@( for pkg in ${PACKAGES}; do \
+		$(GO) test ${TESTFLAGS} \
+			-cover \
+			-coverprofile=profile.out \
+			-covermode=atomic $$pkg || exit; \
+		if [ -f profile.out ]; then \
+			cat profile.out >> coverage.txt; \
+			rm profile.out; \
+		fi; \
+	done )
+
+vendor: ## ensure all the go.mod/go.sum files are up-to-date
+	@echo "$(WHALE) $@"
+	@$(GO) mod tidy
+	@$(GO) mod verify
+
+verify-vendor: ## verify if all the go.mod/go.sum files are up-to-date
+	@echo "$(WHALE) $@"
+	@$(GO) mod tidy
+	@$(GO) mod verify
+	@test -z "$$(git status --short | grep "go.sum" | tee /dev/stderr)" || \
+		((git diff | cat) && \
+		(echo "$(ONI) make sure to checkin changes after go mod tidy" && false))
+
+help: ## this help
+	@awk 'BEGIN {FS = ":.*?## "} /^[a-zA-Z_-]+:.*?## / {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}' $(MAKEFILE_LIST) | sort

vendor/github.com/containerd/ttrpc/PROTOCOL.md

@@ -0,0 +1,240 @@
+# Protocol Specification
+
+The ttrpc protocol is client/server protocol to support multiple request streams
+over a single connection with lightweight framing. The client represents the
+process which initiated the underlying connection and the server is the process
+which accepted the connection. The protocol is currently defined as
+asymmetrical, with clients sending requests and servers sending responses. Both
+clients and servers are able to send stream data. The roles are also used in
+determining the stream identifiers, with client initiated streams using odd
+number identifiers and server initiated using even number. The protocol may be
+extended in the future to support server initiated streams, that is not
+supported in the latest version.
+
+## Purpose
+
+The ttrpc protocol is designed to be lightweight and optimized for low latency
+and reliable connections between processes on the same host. The protocol does
+not include features for handling unreliable connections such as handshakes,
+resets, pings, or flow control. The protocol is designed to make low-overhead
+implementations as simple as possible. It is not intended as a suitable
+replacement for HTTP2/3 over the network.
+
+## Message Frame
+
+Each Message Frame consists of a 10-byte message header followed
+by message data. The data length and stream ID are both big-endian
+4-byte unsigned integers. The message type is an unsigned 1-byte
+integer. The flags are also an unsigned 1-byte integer and
+use is defined by the message type.
+
+    +---------------------------------------------------------------+
+    |                       Data Length (32)                        |
+    +---------------------------------------------------------------+
+    |                        Stream ID (32)                         |
+    +---------------+-----------------------------------------------+
+    | Msg Type (8)  |
+    +---------------+
+    |   Flags (8)   |
+    +---------------+-----------------------------------------------+
+    |                           Data (*)                            |
+    +---------------------------------------------------------------+
+
+The Data Length field represents the number of bytes in the Data field. The
+total frame size will always be Data Length + 10 bytes. The maximum data length
+is 4MB and any larger size should be rejected. Due to the maximum data size
+being less than 16MB, the first frame byte should always be zero. This first
+byte should be considered reserved for future use.
+
+The Stream ID must be odd for client initiated streams and even for server
+initiated streams. Server initiated streams are not currently supported.
+
+## Mesage Types
+
+| Message Type | Name     | Description                      |
+|--------------|----------|----------------------------------|
+| 0x01         | Request  | Initiates stream                 |
+| 0x02         | Response | Final stream data and terminates |
+| 0x03         | Data     | Stream data                      |
+
+### Request
+
+The request message is used to initiate stream and send along request data for
+properly routing and handling the stream. The stream may indicate unary without
+any inbound or outbound stream data with only a response is expected on the
+stream. The request may also indicate the stream is still open for more data and
+no response is expected until data is finished. If the remote indicates the
+stream is closed, the request may be considered non-unary but without anymore
+stream data sent. In the case of `remote closed`, the remote still expects to
+receive a response or stream data. For compatibility with non streaming clients,
+a request with empty flags indicates a unary request.
+
+#### Request Flags
+
+| Flag | Name            | Description                                      |
+|------|-----------------|--------------------------------------------------|
+| 0x01 | `remote closed` | Non-unary, but no more data expected from remote |
+| 0x02 | `remote open`   | Non-unary, remote is still sending data          |
+
+### Response
+
+The response message is used to end a stream with data, an empty response, or
+an error. A response message is the only expected message after a unary request.
+A non-unary request does not require a response message if the server is sending
+back stream data. A non-unary stream may return a single response message but no
+other stream data may follow.
+
+#### Response Flags
+
+No response flags are defined at this time, flags should be empty.
+
+### Data
+
+The data message is used to send data on an already initialized stream. Either
+client or server may send data. A data message is not allowed on a unary stream.
+A data message should not be sent after indicating `remote closed` to the peer.
+The last data message on a stream must set the `remote closed` flag.
+
+The `no data` flag is used to indicate that the data message does not include
+any data. This is normally used with the `remote closed` flag to indicate the
+stream is now closed without transmitting any data. Since ttrpc normally
+transmits a single object per message, a zero length data message may be
+interpreted as an empty object. For example, transmitting the number zero as a
+protobuf message ends up with a data length of zero, but the message is still
+considered data and should be processed.
+
+#### Data Flags
+
+| Flag | Name            | Description                       |
+|------|-----------------|-----------------------------------|
+| 0x01 | `remote closed` | No more data expected from remote |
+| 0x04 | `no data`       | This message does not have data   |
+
+## Streaming
+
+All ttrpc requests use streams to transfer data. Unary streams will only have
+two messages sent per stream, a request from a client and a response from the
+server. Non-unary streams, however, may send any numbers of messages from the
+client and the server. This makes stream management more complicated than unary
+streams since both client and server need to track additional state. To keep
+this management as simple as possible, ttrpc minimizes the number of states and
+uses two flags instead of control frames. Each stream has two states while a
+stream is still alive: `local closed` and `remote closed`. Each peer considers
+local and remote from their own perspective and sets flags from the other peer's
+perspective. For example, if a client sends a data frame with the
+`remote closed` flag, that is indicating that the client is now `local closed`
+and the server will be `remote closed`. A unary operation does not need to send
+these flags since each received message always indicates `remote closed`. Once a
+peer is both `local closed` and `remote closed`, the stream is considered
+finished and may be cleaned up.
+
+Due to the asymmetric nature of the current protocol, a client should
+always be in the `local closed` state before `remote closed` and a server should
+always be in the `remote closed` state before `local closed`. This happens
+because the client is always initiating requests and a client always expects a
+final response back from a server to indicate the initiated request has been
+fulfilled. This may mean server sends a final empty response to finish a stream
+even after it has already completed sending data before the client.
+
+### Unary State Diagram
+
+         +--------+                                    +--------+
+         | Client |                                    | Server |
+         +---+----+                                    +----+---+
+             |               +---------+                    |
+      local  >---------------+ Request +--------------------> remote
+      closed |               +---------+                    | closed
+             |                                              |
+             |              +----------+                    |
+    finished <--------------+ Response +--------------------< finished
+             |              +----------+                    |
+             |                                              |
+
+### Non-Unary State Diagrams
+
+RC: `remote closed` flag
+RO: `remote open` flag
+
+         +--------+                                    +--------+
+         | Client |                                    | Server |
+         +---+----+                                    +----+---+
+             |             +--------------+                 |
+             >-------------+ Request [RO] +----------------->
+             |             +--------------+                 |
+             |                                              |
+             |                 +------+                     |
+             >-----------------+ Data +--------------------->
+             |                 +------+                     |
+             |                                              |
+             |               +-----------+                  |
+      local  >---------------+ Data [RC] +------------------> remote
+      closed |               +-----------+                  | closed
+             |                                              |
+             |              +----------+                    |
+    finished <--------------+ Response +--------------------< finished
+             |              +----------+                    |
+             |                                              |
+
+         +--------+                                    +--------+
+         | Client |                                    | Server |
+         +---+----+                                    +----+---+
+             |             +--------------+                 |
+      local  >-------------+ Request [RC] +-----------------> remote
+      closed |             +--------------+                 | closed
+             |                                              |
+             |                 +------+                     |
+             <-----------------+ Data +---------------------<
+             |                 +------+                     |
+             |                                              |
+             |               +-----------+                  |
+    finished <---------------+ Data [RC] +------------------< finished
+             |               +-----------+                  |
+             |                                              |
+
+         +--------+                                    +--------+
+         | Client |                                    | Server |
+         +---+----+                                    +----+---+
+             |             +--------------+                 |
+             >-------------+ Request [RO] +----------------->
+             |             +--------------+                 |
+             |                                              |
+             |                 +------+                     |
+             >-----------------+ Data +--------------------->
+             |                 +------+                     |
+             |                                              |
+             |                 +------+                     |
+             <-----------------+ Data +---------------------<
+             |                 +------+                     |
+             |                                              |
+             |                 +------+                     |
+             >-----------------+ Data +--------------------->
+             |                 +------+                     |
+             |                                              |
+             |               +-----------+                  |
+      local  >---------------+ Data [RC] +------------------> remote
+      closed |               +-----------+                  | closed
+             |                                              |
+             |                 +------+                     |
+             <-----------------+ Data +---------------------<
+             |                 +------+                     |
+             |                                              |
+             |               +-----------+                  |
+    finished <---------------+ Data [RC] +------------------< finished
+             |               +-----------+                  |
+             |                                              |
+
+## RPC
+
+While this protocol is defined primarily to support Remote Procedure Calls, the
+protocol does not define the request and response types beyond the messages
+defined in the protocol. The implementation provides a default protobuf
+definition of request and response which may be used for cross language rpc.
+All implementations should at least define a request type which support
+routing by procedure name and a response type which supports call status.
+
+## Version History
+
+| Version | Features            |
+|---------|---------------------|
+| 1.0     | Unary requests only |
+| 1.2     | Streaming support   |

vendor/github.com/containerd/ttrpc/Protobuild.toml

@@ -0,0 +1,28 @@
+version = "2"
+generators = ["go"]
+
+# Control protoc include paths. Below are usually some good defaults, but feel
+# free to try it without them if it works for your project.
+[includes]
+  # Include paths that will be added before all others. Typically, you want to
+  # treat the root of the project as an include, but this may not be necessary.
+  before = ["."]
+
+  # Paths that will be added untouched to the end of the includes. We use
+  # `/usr/local/include` to pickup the common install location of protobuf.
+  # This is the default.
+  after = ["/usr/local/include"]
+
+# This section maps protobuf imports to Go packages. These will become
+# `-M` directives in the call to the go protobuf generator.
+[packages]
+  "google/protobuf/any.proto" = "github.com/gogo/protobuf/types"
+  "proto/status.proto" = "google.golang.org/genproto/googleapis/rpc/status"
+
+[[overrides]]
+# enable ttrpc and disable fieldpath and grpc for the shim
+prefixes = ["github.com/containerd/ttrpc/integration/streaming"]
+generators = ["go", "go-ttrpc"]
+
+[overrides.parameters.go-ttrpc]
+prefix = "TTRPC"

vendor/github.com/containerd/ttrpc/README.md

@@ -0,0 +1,59 @@
+# ttrpc
+
+[![Build Status](https://github.com/containerd/ttrpc/workflows/CI/badge.svg)](https://github.com/containerd/ttrpc/actions?query=workflow%3ACI)
+
+GRPC for low-memory environments.
+
+The existing grpc-go project requires a lot of memory overhead for importing
+packages and at runtime. While this is great for many services with low density
+requirements, this can be a problem when running a large number of services on
+a single machine or on a machine with a small amount of memory.
+
+Using the same GRPC definitions, this project reduces the binary size and
+protocol overhead required. We do this by eliding the `net/http`, `net/http2`
+and `grpc` package used by grpc replacing it with a lightweight framing
+protocol. The result are smaller binaries that use less resident memory with
+the same ease of use as GRPC.
+
+Please note that while this project supports generating either end of the
+protocol, the generated service definitions will be incompatible with regular
+GRPC services, as they do not speak the same protocol.
+
+# Protocol
+
+See the [protocol specification](./PROTOCOL.md).
+
+# Usage
+
+Create a gogo vanity binary (see
+[`cmd/protoc-gen-gogottrpc/main.go`](cmd/protoc-gen-gogottrpc/main.go) for an
+example with the ttrpc plugin enabled.
+
+It's recommended to use [`protobuild`](https://github.com/containerd/protobuild)
+to build the protobufs for this project, but this will work with protoc
+directly, if required.
+
+# Differences from GRPC
+
+- The protocol stack has been replaced with a lighter protocol that doesn't
+  require http, http2 and tls.
+- The client and server interface are identical whereas in GRPC there is a
+  client and server interface that are different.
+- The Go stdlib context package is used instead.
+
+# Status
+
+TODO:
+
+- [ ] Add testing under concurrent load to ensure
+- [ ] Verify connection error handling
+
+# Project details
+
+ttrpc is a containerd sub-project, licensed under the [Apache 2.0 license](./LICENSE).
+As a containerd sub-project, you will find the:
+ * [Project governance](https://github.com/containerd/project/blob/main/GOVERNANCE.md),
+ * [Maintainers](https://github.com/containerd/project/blob/main/MAINTAINERS),
+ * and [Contributing guidelines](https://github.com/containerd/project/blob/main/CONTRIBUTING.md)
+
+information in our [`containerd/project`](https://github.com/containerd/project) repository.

vendor/github.com/containerd/ttrpc/channel.go

@@ -0,0 +1,182 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"bufio"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"sync"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+const (
+	messageHeaderLength = 10
+	messageLengthMax    = 4 << 20
+)
+
+type messageType uint8
+
+const (
+	messageTypeRequest  messageType = 0x1
+	messageTypeResponse messageType = 0x2
+	messageTypeData     messageType = 0x3
+)
+
+func (mt messageType) String() string {
+	switch mt {
+	case messageTypeRequest:
+		return "request"
+	case messageTypeResponse:
+		return "response"
+	case messageTypeData:
+		return "data"
+	default:
+		return "unknown"
+	}
+}
+
+const (
+	flagRemoteClosed uint8 = 0x1
+	flagRemoteOpen   uint8 = 0x2
+	flagNoData       uint8 = 0x4
+)
+
+// messageHeader represents the fixed-length message header of 10 bytes sent
+// with every request.
+type messageHeader struct {
+	Length   uint32      // length excluding this header. b[:4]
+	StreamID uint32      // identifies which request stream message is a part of. b[4:8]
+	Type     messageType // message type b[8]
+	Flags    uint8       // type specific flags b[9]
+}
+
+func readMessageHeader(p []byte, r io.Reader) (messageHeader, error) {
+	_, err := io.ReadFull(r, p[:messageHeaderLength])
+	if err != nil {
+		return messageHeader{}, err
+	}
+
+	return messageHeader{
+		Length:   binary.BigEndian.Uint32(p[:4]),
+		StreamID: binary.BigEndian.Uint32(p[4:8]),
+		Type:     messageType(p[8]),
+		Flags:    p[9],
+	}, nil
+}
+
+func writeMessageHeader(w io.Writer, p []byte, mh messageHeader) error {
+	binary.BigEndian.PutUint32(p[:4], mh.Length)
+	binary.BigEndian.PutUint32(p[4:8], mh.StreamID)
+	p[8] = byte(mh.Type)
+	p[9] = mh.Flags
+
+	_, err := w.Write(p[:])
+	return err
+}
+
+var buffers sync.Pool
+
+type channel struct {
+	conn  net.Conn
+	bw    *bufio.Writer
+	br    *bufio.Reader
+	hrbuf [messageHeaderLength]byte // avoid alloc when reading header
+	hwbuf [messageHeaderLength]byte
+}
+
+func newChannel(conn net.Conn) *channel {
+	return &channel{
+		conn: conn,
+		bw:   bufio.NewWriter(conn),
+		br:   bufio.NewReader(conn),
+	}
+}
+
+// recv a message from the channel. The returned buffer contains the message.
+//
+// If a valid grpc status is returned, the message header
+// returned will be valid and caller should send that along to
+// the correct consumer. The bytes on the underlying channel
+// will be discarded.
+func (ch *channel) recv() (messageHeader, []byte, error) {
+	mh, err := readMessageHeader(ch.hrbuf[:], ch.br)
+	if err != nil {
+		return messageHeader{}, nil, err
+	}
+
+	if mh.Length > uint32(messageLengthMax) {
+		if _, err := ch.br.Discard(int(mh.Length)); err != nil {
+			return mh, nil, fmt.Errorf("failed to discard after receiving oversized message: %w", err)
+		}
+
+		return mh, nil, status.Errorf(codes.ResourceExhausted, "message length %v exceed maximum message size of %v", mh.Length, messageLengthMax)
+	}
+
+	var p []byte
+	if mh.Length > 0 {
+		p = ch.getmbuf(int(mh.Length))
+		if _, err := io.ReadFull(ch.br, p); err != nil {
+			return messageHeader{}, nil, fmt.Errorf("failed reading message: %w", err)
+		}
+	}
+
+	return mh, p, nil
+}
+
+func (ch *channel) send(streamID uint32, t messageType, flags uint8, p []byte) error {
+	// TODO: Error on send rather than on recv
+	//if len(p) > messageLengthMax {
+	//	return status.Errorf(codes.InvalidArgument, "refusing to send, message length %v exceed maximum message size of %v", len(p), messageLengthMax)
+	//}
+	if err := writeMessageHeader(ch.bw, ch.hwbuf[:], messageHeader{Length: uint32(len(p)), StreamID: streamID, Type: t, Flags: flags}); err != nil {
+		return err
+	}
+
+	if len(p) > 0 {
+		_, err := ch.bw.Write(p)
+		if err != nil {
+			return err
+		}
+	}
+
+	return ch.bw.Flush()
+}
+
+func (ch *channel) getmbuf(size int) []byte {
+	// we can't use the standard New method on pool because we want to allocate
+	// based on size.
+	b, ok := buffers.Get().(*[]byte)
+	if !ok || cap(*b) < size {
+		// TODO(stevvooe): It may be better to allocate these in fixed length
+		// buckets to reduce fragmentation but its not clear that would help
+		// with performance. An ilogb approach or similar would work well.
+		bb := make([]byte, size)
+		b = &bb
+	} else {
+		*b = (*b)[:size]
+	}
+	return *b
+}
+
+func (ch *channel) putmbuf(p []byte) {
+	buffers.Put(&p)
+}

vendor/github.com/containerd/ttrpc/client.go

@@ -0,0 +1,512 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+)
+
+// Client for a ttrpc server
+type Client struct {
+	codec   codec
+	conn    net.Conn
+	channel *channel
+
+	streamLock   sync.RWMutex
+	streams      map[streamID]*stream
+	nextStreamID streamID
+	sendLock     sync.Mutex
+
+	ctx    context.Context
+	closed func()
+
+	closeOnce       sync.Once
+	userCloseFunc   func()
+	userCloseWaitCh chan struct{}
+
+	interceptor UnaryClientInterceptor
+}
+
+// ClientOpts configures a client
+type ClientOpts func(c *Client)
+
+// WithOnClose sets the close func whenever the client's Close() method is called
+func WithOnClose(onClose func()) ClientOpts {
+	return func(c *Client) {
+		c.userCloseFunc = onClose
+	}
+}
+
+// WithUnaryClientInterceptor sets the provided client interceptor
+func WithUnaryClientInterceptor(i UnaryClientInterceptor) ClientOpts {
+	return func(c *Client) {
+		c.interceptor = i
+	}
+}
+
+// NewClient creates a new ttrpc client using the given connection
+func NewClient(conn net.Conn, opts ...ClientOpts) *Client {
+	ctx, cancel := context.WithCancel(context.Background())
+	channel := newChannel(conn)
+	c := &Client{
+		codec:           codec{},
+		conn:            conn,
+		channel:         channel,
+		streams:         make(map[streamID]*stream),
+		nextStreamID:    1,
+		closed:          cancel,
+		ctx:             ctx,
+		userCloseFunc:   func() {},
+		userCloseWaitCh: make(chan struct{}),
+		interceptor:     defaultClientInterceptor,
+	}
+
+	for _, o := range opts {
+		o(c)
+	}
+
+	go c.run()
+	return c
+}
+
+func (c *Client) send(sid uint32, mt messageType, flags uint8, b []byte) error {
+	c.sendLock.Lock()
+	defer c.sendLock.Unlock()
+	return c.channel.send(sid, mt, flags, b)
+}
+
+// Call makes a unary request and returns with response
+func (c *Client) Call(ctx context.Context, service, method string, req, resp interface{}) error {
+	payload, err := c.codec.Marshal(req)
+	if err != nil {
+		return err
+	}
+
+	var (
+		creq = &Request{
+			Service: service,
+			Method:  method,
+			Payload: payload,
+			// TODO: metadata from context
+		}
+
+		cresp = &Response{}
+	)
+
+	if metadata, ok := GetMetadata(ctx); ok {
+		metadata.setRequest(creq)
+	}
+
+	if dl, ok := ctx.Deadline(); ok {
+		creq.TimeoutNano = time.Until(dl).Nanoseconds()
+	}
+
+	info := &UnaryClientInfo{
+		FullMethod: fullPath(service, method),
+	}
+	if err := c.interceptor(ctx, creq, cresp, info, c.dispatch); err != nil {
+		return err
+	}
+
+	if err := c.codec.Unmarshal(cresp.Payload, resp); err != nil {
+		return err
+	}
+
+	if cresp.Status != nil && cresp.Status.Code != int32(codes.OK) {
+		return status.ErrorProto(cresp.Status)
+	}
+	return nil
+}
+
+// StreamDesc describes the stream properties, whether the stream has
+// a streaming client, a streaming server, or both
+type StreamDesc struct {
+	StreamingClient bool
+	StreamingServer bool
+}
+
+// ClientStream is used to send or recv messages on the underlying stream
+type ClientStream interface {
+	CloseSend() error
+	SendMsg(m interface{}) error
+	RecvMsg(m interface{}) error
+}
+
+type clientStream struct {
+	ctx          context.Context
+	s            *stream
+	c            *Client
+	desc         *StreamDesc
+	localClosed  bool
+	remoteClosed bool
+}
+
+func (cs *clientStream) CloseSend() error {
+	if !cs.desc.StreamingClient {
+		return fmt.Errorf("%w: cannot close non-streaming client", ErrProtocol)
+	}
+	if cs.localClosed {
+		return ErrStreamClosed
+	}
+	err := cs.s.send(messageTypeData, flagRemoteClosed|flagNoData, nil)
+	if err != nil {
+		return filterCloseErr(err)
+	}
+	cs.localClosed = true
+	return nil
+}
+
+func (cs *clientStream) SendMsg(m interface{}) error {
+	if !cs.desc.StreamingClient {
+		return fmt.Errorf("%w: cannot send data from non-streaming client", ErrProtocol)
+	}
+	if cs.localClosed {
+		return ErrStreamClosed
+	}
+
+	var (
+		payload []byte
+		err     error
+	)
+	if m != nil {
+		payload, err = cs.c.codec.Marshal(m)
+		if err != nil {
+			return err
+		}
+	}
+
+	err = cs.s.send(messageTypeData, 0, payload)
+	if err != nil {
+		return filterCloseErr(err)
+	}
+
+	return nil
+}
+
+func (cs *clientStream) RecvMsg(m interface{}) error {
+	if cs.remoteClosed {
+		return io.EOF
+	}
+
+	var msg *streamMessage
+	select {
+	case <-cs.ctx.Done():
+		return cs.ctx.Err()
+	case <-cs.s.recvClose:
+		// If recv has a pending message, process that first
+		select {
+		case msg = <-cs.s.recv:
+		default:
+			return cs.s.recvErr
+		}
+	case msg = <-cs.s.recv:
+	}
+
+	if msg.header.Type == messageTypeResponse {
+		resp := &Response{}
+		err := proto.Unmarshal(msg.payload[:msg.header.Length], resp)
+		// return the payload buffer for reuse
+		cs.c.channel.putmbuf(msg.payload)
+		if err != nil {
+			return err
+		}
+
+		if err := cs.c.codec.Unmarshal(resp.Payload, m); err != nil {
+			return err
+		}
+
+		if resp.Status != nil && resp.Status.Code != int32(codes.OK) {
+			return status.ErrorProto(resp.Status)
+		}
+
+		cs.c.deleteStream(cs.s)
+		cs.remoteClosed = true
+
+		return nil
+	} else if msg.header.Type == messageTypeData {
+		if !cs.desc.StreamingServer {
+			cs.c.deleteStream(cs.s)
+			cs.remoteClosed = true
+			return fmt.Errorf("received data from non-streaming server: %w", ErrProtocol)
+		}
+		if msg.header.Flags&flagRemoteClosed == flagRemoteClosed {
+			cs.c.deleteStream(cs.s)
+			cs.remoteClosed = true
+
+			if msg.header.Flags&flagNoData == flagNoData {
+				return io.EOF
+			}
+		}
+
+		err := cs.c.codec.Unmarshal(msg.payload[:msg.header.Length], m)
+		cs.c.channel.putmbuf(msg.payload)
+		if err != nil {
+			return err
+		}
+		return nil
+	}
+
+	return fmt.Errorf("unexpected %q message received: %w", msg.header.Type, ErrProtocol)
+}
+
+// Close closes the ttrpc connection and underlying connection
+func (c *Client) Close() error {
+	c.closeOnce.Do(func() {
+		c.closed()
+
+		c.conn.Close()
+	})
+	return nil
+}
+
+// UserOnCloseWait is used to blocks untils the user's on-close callback
+// finishes.
+func (c *Client) UserOnCloseWait(ctx context.Context) error {
+	select {
+	case <-c.userCloseWaitCh:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}
+
+func (c *Client) run() {
+	err := c.receiveLoop()
+	c.Close()
+	c.cleanupStreams(err)
+
+	c.userCloseFunc()
+	close(c.userCloseWaitCh)
+}
+
+func (c *Client) receiveLoop() error {
+	for {
+		select {
+		case <-c.ctx.Done():
+			return ErrClosed
+		default:
+			var (
+				msg = &streamMessage{}
+				err error
+			)
+
+			msg.header, msg.payload, err = c.channel.recv()
+			if err != nil {
+				_, ok := status.FromError(err)
+				if !ok {
+					// treat all errors that are not an rpc status as terminal.
+					// all others poison the connection.
+					return filterCloseErr(err)
+				}
+			}
+			sid := streamID(msg.header.StreamID)
+			s := c.getStream(sid)
+			if s == nil {
+				logrus.WithField("stream", sid).Errorf("ttrpc: received message on inactive stream")
+				continue
+			}
+
+			if err != nil {
+				s.closeWithError(err)
+			} else {
+				if err := s.receive(c.ctx, msg); err != nil {
+					logrus.WithError(err).WithField("stream", sid).Errorf("ttrpc: failed to handle message")
+				}
+			}
+		}
+	}
+}
+
+// createStream creates a new stream and registers it with the client
+// Introduce stream types for multiple or single response
+func (c *Client) createStream(flags uint8, b []byte) (*stream, error) {
+	c.streamLock.Lock()
+
+	// Check if closed since lock acquired to prevent adding
+	// anything after cleanup completes
+	select {
+	case <-c.ctx.Done():
+		c.streamLock.Unlock()
+		return nil, ErrClosed
+	default:
+	}
+
+	// Stream ID should be allocated at same time
+	s := newStream(c.nextStreamID, c)
+	c.streams[s.id] = s
+	c.nextStreamID = c.nextStreamID + 2
+
+	c.sendLock.Lock()
+	defer c.sendLock.Unlock()
+	c.streamLock.Unlock()
+
+	if err := c.channel.send(uint32(s.id), messageTypeRequest, flags, b); err != nil {
+		return s, filterCloseErr(err)
+	}
+
+	return s, nil
+}
+
+func (c *Client) deleteStream(s *stream) {
+	c.streamLock.Lock()
+	delete(c.streams, s.id)
+	c.streamLock.Unlock()
+	s.closeWithError(nil)
+}
+
+func (c *Client) getStream(sid streamID) *stream {
+	c.streamLock.RLock()
+	s := c.streams[sid]
+	c.streamLock.RUnlock()
+	return s
+}
+
+func (c *Client) cleanupStreams(err error) {
+	c.streamLock.Lock()
+	defer c.streamLock.Unlock()
+
+	for sid, s := range c.streams {
+		s.closeWithError(err)
+		delete(c.streams, sid)
+	}
+}
+
+// filterCloseErr rewrites EOF and EPIPE errors to ErrClosed. Use when
+// returning from call or handling errors from main read loop.
+//
+// This purposely ignores errors with a wrapped cause.
+func filterCloseErr(err error) error {
+	switch {
+	case err == nil:
+		return nil
+	case err == io.EOF:
+		return ErrClosed
+	case errors.Is(err, io.ErrClosedPipe):
+		return ErrClosed
+	case errors.Is(err, io.EOF):
+		return ErrClosed
+	case strings.Contains(err.Error(), "use of closed network connection"):
+		return ErrClosed
+	default:
+		// if we have an epipe on a write or econnreset on a read , we cast to errclosed
+		var oerr *net.OpError
+		if errors.As(err, &oerr) {
+			if (oerr.Op == "write" && errors.Is(err, syscall.EPIPE)) ||
+				(oerr.Op == "read" && errors.Is(err, syscall.ECONNRESET)) {
+				return ErrClosed
+			}
+		}
+	}
+
+	return err
+}
+
+// NewStream creates a new stream with the given stream descriptor to the
+// specified service and method. If not a streaming client, the request object
+// may be provided.
+func (c *Client) NewStream(ctx context.Context, desc *StreamDesc, service, method string, req interface{}) (ClientStream, error) {
+	var payload []byte
+	if req != nil {
+		var err error
+		payload, err = c.codec.Marshal(req)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	request := &Request{
+		Service: service,
+		Method:  method,
+		Payload: payload,
+		// TODO: metadata from context
+	}
+	p, err := c.codec.Marshal(request)
+	if err != nil {
+		return nil, err
+	}
+
+	var flags uint8
+	if desc.StreamingClient {
+		flags = flagRemoteOpen
+	} else {
+		flags = flagRemoteClosed
+	}
+	s, err := c.createStream(flags, p)
+	if err != nil {
+		return nil, err
+	}
+
+	return &clientStream{
+		ctx:  ctx,
+		s:    s,
+		c:    c,
+		desc: desc,
+	}, nil
+}
+
+func (c *Client) dispatch(ctx context.Context, req *Request, resp *Response) error {
+	p, err := c.codec.Marshal(req)
+	if err != nil {
+		return err
+	}
+
+	s, err := c.createStream(0, p)
+	if err != nil {
+		return err
+	}
+	defer c.deleteStream(s)
+
+	var msg *streamMessage
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-c.ctx.Done():
+		return ErrClosed
+	case <-s.recvClose:
+		// If recv has a pending message, process that first
+		select {
+		case msg = <-s.recv:
+		default:
+			return s.recvErr
+		}
+	case msg = <-s.recv:
+	}
+
+	if msg.header.Type == messageTypeResponse {
+		err = proto.Unmarshal(msg.payload[:msg.header.Length], resp)
+	} else {
+		err = fmt.Errorf("unexpected %q message received: %w", msg.header.Type, ErrProtocol)
+	}
+
+	// return the payload buffer for reuse
+	c.channel.putmbuf(msg.payload)
+
+	return err
+}

vendor/github.com/containerd/ttrpc/codec.go

@@ -0,0 +1,43 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"fmt"
+
+	"google.golang.org/protobuf/proto"
+)
+
+type codec struct{}
+
+func (c codec) Marshal(msg interface{}) ([]byte, error) {
+	switch v := msg.(type) {
+	case proto.Message:
+		return proto.Marshal(v)
+	default:
+		return nil, fmt.Errorf("ttrpc: cannot marshal unknown type: %T", msg)
+	}
+}
+
+func (c codec) Unmarshal(p []byte, msg interface{}) error {
+	switch v := msg.(type) {
+	case proto.Message:
+		return proto.Unmarshal(p, v)
+	default:
+		return fmt.Errorf("ttrpc: cannot unmarshal into unknown type: %T", msg)
+	}
+}

vendor/github.com/containerd/ttrpc/config.go

@@ -0,0 +1,52 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import "errors"
+
+type serverConfig struct {
+	handshaker  Handshaker
+	interceptor UnaryServerInterceptor
+}
+
+// ServerOpt for configuring a ttrpc server
+type ServerOpt func(*serverConfig) error
+
+// WithServerHandshaker can be passed to NewServer to ensure that the
+// handshaker is called before every connection attempt.
+//
+// Only one handshaker is allowed per server.
+func WithServerHandshaker(handshaker Handshaker) ServerOpt {
+	return func(c *serverConfig) error {
+		if c.handshaker != nil {
+			return errors.New("only one handshaker allowed per server")
+		}
+		c.handshaker = handshaker
+		return nil
+	}
+}
+
+// WithUnaryServerInterceptor sets the provided interceptor on the server
+func WithUnaryServerInterceptor(i UnaryServerInterceptor) ServerOpt {
+	return func(c *serverConfig) error {
+		if c.interceptor != nil {
+			return errors.New("only one interceptor allowed per server")
+		}
+		c.interceptor = i
+		return nil
+	}
+}

vendor/github.com/containerd/ttrpc/doc.go

@@ -0,0 +1,23 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+/*
+package ttrpc defines and implements a low level simple transfer protocol
+optimized for low latency and reliable connections between processes on the same
+host. The protocol uses simple framing for sending requests, responses, and data
+using multiple streams.
+*/
+package ttrpc

vendor/github.com/containerd/ttrpc/errors.go

@@ -0,0 +1,34 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import "errors"
+
+var (
+	// ErrProtocol is a general error in the handling the protocol.
+	ErrProtocol = errors.New("protocol error")
+
+	// ErrClosed is returned by client methods when the underlying connection is
+	// closed.
+	ErrClosed = errors.New("ttrpc: closed")
+
+	// ErrServerClosed is returned when the Server has closed its connection.
+	ErrServerClosed = errors.New("ttrpc: server closed")
+
+	// ErrStreamClosed is when the streaming connection is closed.
+	ErrStreamClosed = errors.New("ttrpc: stream closed")
+)

vendor/github.com/containerd/ttrpc/handshake.go

@@ -0,0 +1,50 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"net"
+)
+
+// Handshaker defines the interface for connection handshakes performed on the
+// server or client when first connecting.
+type Handshaker interface {
+	// Handshake should confirm or decorate a connection that may be incoming
+	// to a server or outgoing from a client.
+	//
+	// If this returns without an error, the caller should use the connection
+	// in place of the original connection.
+	//
+	// The second return value can contain credential specific data, such as
+	// unix socket credentials or TLS information.
+	//
+	// While we currently only have implementations on the server-side, this
+	// interface should be sufficient to implement similar handshakes on the
+	// client-side.
+	Handshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error)
+}
+
+type handshakerFunc func(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error)
+
+func (fn handshakerFunc) Handshake(ctx context.Context, conn net.Conn) (net.Conn, interface{}, error) {
+	return fn(ctx, conn)
+}
+
+func noopHandshake(_ context.Context, conn net.Conn) (net.Conn, interface{}, error) {
+	return conn, nil, nil
+}

vendor/github.com/containerd/ttrpc/interceptor.go

@@ -0,0 +1,65 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import "context"
+
+// UnaryServerInfo provides information about the server request
+type UnaryServerInfo struct {
+	FullMethod string
+}
+
+// UnaryClientInfo provides information about the client request
+type UnaryClientInfo struct {
+	FullMethod string
+}
+
+// StreamServerInfo provides information about the server request
+type StreamServerInfo struct {
+	FullMethod      string
+	StreamingClient bool
+	StreamingServer bool
+}
+
+// Unmarshaler contains the server request data and allows it to be unmarshaled
+// into a concrete type
+type Unmarshaler func(interface{}) error
+
+// Invoker invokes the client's request and response from the ttrpc server
+type Invoker func(context.Context, *Request, *Response) error
+
+// UnaryServerInterceptor specifies the interceptor function for server request/response
+type UnaryServerInterceptor func(context.Context, Unmarshaler, *UnaryServerInfo, Method) (interface{}, error)
+
+// UnaryClientInterceptor specifies the interceptor function for client request/response
+type UnaryClientInterceptor func(context.Context, *Request, *Response, *UnaryClientInfo, Invoker) error
+
+func defaultServerInterceptor(ctx context.Context, unmarshal Unmarshaler, _ *UnaryServerInfo, method Method) (interface{}, error) {
+	return method(ctx, unmarshal)
+}
+
+func defaultClientInterceptor(ctx context.Context, req *Request, resp *Response, _ *UnaryClientInfo, invoker Invoker) error {
+	return invoker(ctx, req, resp)
+}
+
+type StreamServerInterceptor func(context.Context, StreamServer, *StreamServerInfo, StreamHandler) (interface{}, error)
+
+func defaultStreamServerInterceptor(ctx context.Context, ss StreamServer, _ *StreamServerInfo, stream StreamHandler) (interface{}, error) {
+	return stream(ctx, ss)
+}
+
+type StreamClientInterceptor func(context.Context)

vendor/github.com/containerd/ttrpc/metadata.go

@@ -0,0 +1,107 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"strings"
+)
+
+// MD is the user type for ttrpc metadata
+type MD map[string][]string
+
+// Get returns the metadata for a given key when they exist.
+// If there is no metadata, a nil slice and false are returned.
+func (m MD) Get(key string) ([]string, bool) {
+	key = strings.ToLower(key)
+	list, ok := m[key]
+	if !ok || len(list) == 0 {
+		return nil, false
+	}
+
+	return list, true
+}
+
+// Set sets the provided values for a given key.
+// The values will overwrite any existing values.
+// If no values provided, a key will be deleted.
+func (m MD) Set(key string, values ...string) {
+	key = strings.ToLower(key)
+	if len(values) == 0 {
+		delete(m, key)
+		return
+	}
+	m[key] = values
+}
+
+// Append appends additional values to the given key.
+func (m MD) Append(key string, values ...string) {
+	key = strings.ToLower(key)
+	if len(values) == 0 {
+		return
+	}
+	current, ok := m[key]
+	if ok {
+		m.Set(key, append(current, values...)...)
+	} else {
+		m.Set(key, values...)
+	}
+}
+
+func (m MD) setRequest(r *Request) {
+	for k, values := range m {
+		for _, v := range values {
+			r.Metadata = append(r.Metadata, &KeyValue{
+				Key:   k,
+				Value: v,
+			})
+		}
+	}
+}
+
+func (m MD) fromRequest(r *Request) {
+	for _, kv := range r.Metadata {
+		m[kv.Key] = append(m[kv.Key], kv.Value)
+	}
+}
+
+type metadataKey struct{}
+
+// GetMetadata retrieves metadata from context.Context (previously attached with WithMetadata)
+func GetMetadata(ctx context.Context) (MD, bool) {
+	metadata, ok := ctx.Value(metadataKey{}).(MD)
+	return metadata, ok
+}
+
+// GetMetadataValue gets a specific metadata value by name from context.Context
+func GetMetadataValue(ctx context.Context, name string) (string, bool) {
+	metadata, ok := GetMetadata(ctx)
+	if !ok {
+		return "", false
+	}
+
+	if list, ok := metadata.Get(name); ok {
+		return list[0], true
+	}
+
+	return "", false
+}
+
+// WithMetadata attaches metadata map to a context.Context
+func WithMetadata(ctx context.Context, md MD) context.Context {
+	return context.WithValue(ctx, metadataKey{}, md)
+}

vendor/github.com/containerd/ttrpc/request.pb.go

@@ -0,0 +1,396 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.20.1
+// source: github.com/containerd/ttrpc/request.proto
+
+package ttrpc
+
+import (
+	status "google.golang.org/genproto/googleapis/rpc/status"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Request struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Service     string      `protobuf:"bytes,1,opt,name=service,proto3" json:"service,omitempty"`
+	Method      string      `protobuf:"bytes,2,opt,name=method,proto3" json:"method,omitempty"`
+	Payload     []byte      `protobuf:"bytes,3,opt,name=payload,proto3" json:"payload,omitempty"`
+	TimeoutNano int64       `protobuf:"varint,4,opt,name=timeout_nano,json=timeoutNano,proto3" json:"timeout_nano,omitempty"`
+	Metadata    []*KeyValue `protobuf:"bytes,5,rep,name=metadata,proto3" json:"metadata,omitempty"`
+}
+
+func (x *Request) Reset() {
+	*x = Request{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Request) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Request) ProtoMessage() {}
+
+func (x *Request) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Request.ProtoReflect.Descriptor instead.
+func (*Request) Descriptor() ([]byte, []int) {
+	return file_github_com_containerd_ttrpc_request_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Request) GetService() string {
+	if x != nil {
+		return x.Service
+	}
+	return ""
+}
+
+func (x *Request) GetMethod() string {
+	if x != nil {
+		return x.Method
+	}
+	return ""
+}
+
+func (x *Request) GetPayload() []byte {
+	if x != nil {
+		return x.Payload
+	}
+	return nil
+}
+
+func (x *Request) GetTimeoutNano() int64 {
+	if x != nil {
+		return x.TimeoutNano
+	}
+	return 0
+}
+
+func (x *Request) GetMetadata() []*KeyValue {
+	if x != nil {
+		return x.Metadata
+	}
+	return nil
+}
+
+type Response struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Status  *status.Status `protobuf:"bytes,1,opt,name=status,proto3" json:"status,omitempty"`
+	Payload []byte         `protobuf:"bytes,2,opt,name=payload,proto3" json:"payload,omitempty"`
+}
+
+func (x *Response) Reset() {
+	*x = Response{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Response) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Response) ProtoMessage() {}
+
+func (x *Response) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Response.ProtoReflect.Descriptor instead.
+func (*Response) Descriptor() ([]byte, []int) {
+	return file_github_com_containerd_ttrpc_request_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *Response) GetStatus() *status.Status {
+	if x != nil {
+		return x.Status
+	}
+	return nil
+}
+
+func (x *Response) GetPayload() []byte {
+	if x != nil {
+		return x.Payload
+	}
+	return nil
+}
+
+type StringList struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	List []string `protobuf:"bytes,1,rep,name=list,proto3" json:"list,omitempty"`
+}
+
+func (x *StringList) Reset() {
+	*x = StringList{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StringList) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StringList) ProtoMessage() {}
+
+func (x *StringList) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use StringList.ProtoReflect.Descriptor instead.
+func (*StringList) Descriptor() ([]byte, []int) {
+	return file_github_com_containerd_ttrpc_request_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *StringList) GetList() []string {
+	if x != nil {
+		return x.List
+	}
+	return nil
+}
+
+type KeyValue struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key   string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *KeyValue) Reset() {
+	*x = KeyValue{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *KeyValue) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*KeyValue) ProtoMessage() {}
+
+func (x *KeyValue) ProtoReflect() protoreflect.Message {
+	mi := &file_github_com_containerd_ttrpc_request_proto_msgTypes[3]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use KeyValue.ProtoReflect.Descriptor instead.
+func (*KeyValue) Descriptor() ([]byte, []int) {
+	return file_github_com_containerd_ttrpc_request_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *KeyValue) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (x *KeyValue) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+var File_github_com_containerd_ttrpc_request_proto protoreflect.FileDescriptor
+
+var file_github_com_containerd_ttrpc_request_proto_rawDesc = []byte{
+	0x0a, 0x29, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x6e,
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+	0x20, 0x01, 0x28, 0x03, 0x52, 0x0b, 0x74, 0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x4e, 0x61, 0x6e,
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+	0x61, 0x74, 0x75, 0x73, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x07, 0x2e, 0x53, 0x74, 0x61,
+	0x74, 0x75, 0x73, 0x52, 0x06, 0x73, 0x74, 0x61, 0x74, 0x75, 0x73, 0x12, 0x18, 0x0a, 0x07, 0x70,
+	0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x07, 0x70, 0x61,
+	0x79, 0x6c, 0x6f, 0x61, 0x64, 0x22, 0x20, 0x0a, 0x0a, 0x53, 0x74, 0x72, 0x69, 0x6e, 0x67, 0x4c,
+	0x69, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x6c, 0x69, 0x73, 0x74, 0x18, 0x01, 0x20, 0x03, 0x28,
+	0x09, 0x52, 0x04, 0x6c, 0x69, 0x73, 0x74, 0x22, 0x32, 0x0a, 0x08, 0x4b, 0x65, 0x79, 0x56, 0x61,
+	0x6c, 0x75, 0x65, 0x12, 0x10, 0x0a, 0x03, 0x6b, 0x65, 0x79, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09,
+	0x52, 0x03, 0x6b, 0x65, 0x79, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x42, 0x1d, 0x5a, 0x1b, 0x67,
+	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x6e, 0x74, 0x61, 0x69,
+	0x6e, 0x65, 0x72, 0x64, 0x2f, 0x74, 0x74, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
+}
+
+var (
+	file_github_com_containerd_ttrpc_request_proto_rawDescOnce sync.Once
+	file_github_com_containerd_ttrpc_request_proto_rawDescData = file_github_com_containerd_ttrpc_request_proto_rawDesc
+)
+
+func file_github_com_containerd_ttrpc_request_proto_rawDescGZIP() []byte {
+	file_github_com_containerd_ttrpc_request_proto_rawDescOnce.Do(func() {
+		file_github_com_containerd_ttrpc_request_proto_rawDescData = protoimpl.X.CompressGZIP(file_github_com_containerd_ttrpc_request_proto_rawDescData)
+	})
+	return file_github_com_containerd_ttrpc_request_proto_rawDescData
+}
+
+var file_github_com_containerd_ttrpc_request_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_github_com_containerd_ttrpc_request_proto_goTypes = []interface{}{
+	(*Request)(nil),       // 0: ttrpc.Request
+	(*Response)(nil),      // 1: ttrpc.Response
+	(*StringList)(nil),    // 2: ttrpc.StringList
+	(*KeyValue)(nil),      // 3: ttrpc.KeyValue
+	(*status.Status)(nil), // 4: Status
+}
+var file_github_com_containerd_ttrpc_request_proto_depIdxs = []int32{
+	3, // 0: ttrpc.Request.metadata:type_name -> ttrpc.KeyValue
+	4, // 1: ttrpc.Response.status:type_name -> Status
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_github_com_containerd_ttrpc_request_proto_init() }
+func file_github_com_containerd_ttrpc_request_proto_init() {
+	if File_github_com_containerd_ttrpc_request_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_github_com_containerd_ttrpc_request_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Request); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_github_com_containerd_ttrpc_request_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Response); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_github_com_containerd_ttrpc_request_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StringList); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_github_com_containerd_ttrpc_request_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*KeyValue); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_github_com_containerd_ttrpc_request_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_github_com_containerd_ttrpc_request_proto_goTypes,
+		DependencyIndexes: file_github_com_containerd_ttrpc_request_proto_depIdxs,
+		MessageInfos:      file_github_com_containerd_ttrpc_request_proto_msgTypes,
+	}.Build()
+	File_github_com_containerd_ttrpc_request_proto = out.File
+	file_github_com_containerd_ttrpc_request_proto_rawDesc = nil
+	file_github_com_containerd_ttrpc_request_proto_goTypes = nil
+	file_github_com_containerd_ttrpc_request_proto_depIdxs = nil
+}

vendor/github.com/containerd/ttrpc/request.proto

@@ -0,0 +1,29 @@
+syntax = "proto3";
+
+package ttrpc;
+
+import "proto/status.proto";
+
+option go_package = "github.com/containerd/ttrpc";
+
+message Request {
+	string service = 1;
+	string method = 2;
+	bytes payload = 3;
+	int64 timeout_nano = 4;
+	repeated KeyValue metadata = 5;
+}
+
+message Response {
+	Status status = 1;
+	bytes payload = 2;
+}
+
+message StringList {
+	repeated string list = 1;
+}
+
+message KeyValue {
+	string key = 1;
+	string value = 2;
+}

vendor/github.com/containerd/ttrpc/server.go

@@ -0,0 +1,579 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"errors"
+	"io"
+	"math/rand"
+	"net"
+	"sync"
+	"sync/atomic"
+	"syscall"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+)
+
+type Server struct {
+	config   *serverConfig
+	services *serviceSet
+	codec    codec
+
+	mu          sync.Mutex
+	listeners   map[net.Listener]struct{}
+	connections map[*serverConn]struct{} // all connections to current state
+	done        chan struct{}            // marks point at which we stop serving requests
+}
+
+func NewServer(opts ...ServerOpt) (*Server, error) {
+	config := &serverConfig{}
+	for _, opt := range opts {
+		if err := opt(config); err != nil {
+			return nil, err
+		}
+	}
+	if config.interceptor == nil {
+		config.interceptor = defaultServerInterceptor
+	}
+
+	return &Server{
+		config:      config,
+		services:    newServiceSet(config.interceptor),
+		done:        make(chan struct{}),
+		listeners:   make(map[net.Listener]struct{}),
+		connections: make(map[*serverConn]struct{}),
+	}, nil
+}
+
+// Register registers a map of methods to method handlers
+// TODO: Remove in 2.0, does not support streams
+func (s *Server) Register(name string, methods map[string]Method) {
+	s.services.register(name, &ServiceDesc{Methods: methods})
+}
+
+func (s *Server) RegisterService(name string, desc *ServiceDesc) {
+	s.services.register(name, desc)
+}
+
+func (s *Server) Serve(ctx context.Context, l net.Listener) error {
+	s.addListener(l)
+	defer s.closeListener(l)
+
+	var (
+		backoff    time.Duration
+		handshaker = s.config.handshaker
+	)
+
+	if handshaker == nil {
+		handshaker = handshakerFunc(noopHandshake)
+	}
+
+	for {
+		conn, err := l.Accept()
+		if err != nil {
+			select {
+			case <-s.done:
+				return ErrServerClosed
+			default:
+			}
+
+			if terr, ok := err.(interface {
+				Temporary() bool
+			}); ok && terr.Temporary() {
+				if backoff == 0 {
+					backoff = time.Millisecond
+				} else {
+					backoff *= 2
+				}
+
+				if max := time.Second; backoff > max {
+					backoff = max
+				}
+
+				sleep := time.Duration(rand.Int63n(int64(backoff)))
+				logrus.WithError(err).Errorf("ttrpc: failed accept; backoff %v", sleep)
+				time.Sleep(sleep)
+				continue
+			}
+
+			return err
+		}
+
+		backoff = 0
+
+		approved, handshake, err := handshaker.Handshake(ctx, conn)
+		if err != nil {
+			logrus.WithError(err).Error("ttrpc: refusing connection after handshake")
+			conn.Close()
+			continue
+		}
+
+		sc, err := s.newConn(approved, handshake)
+		if err != nil {
+			logrus.WithError(err).Error("ttrpc: create connection failed")
+			conn.Close()
+			continue
+		}
+
+		go sc.run(ctx)
+	}
+}
+
+func (s *Server) Shutdown(ctx context.Context) error {
+	s.mu.Lock()
+	select {
+	case <-s.done:
+	default:
+		// protected by mutex
+		close(s.done)
+	}
+	lnerr := s.closeListeners()
+	s.mu.Unlock()
+
+	ticker := time.NewTicker(200 * time.Millisecond)
+	defer ticker.Stop()
+	for {
+		s.closeIdleConns()
+
+		if s.countConnection() == 0 {
+			break
+		}
+
+		select {
+		case <-ctx.Done():
+			return ctx.Err()
+		case <-ticker.C:
+		}
+	}
+
+	return lnerr
+}
+
+// Close the server without waiting for active connections.
+func (s *Server) Close() error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	select {
+	case <-s.done:
+	default:
+		// protected by mutex
+		close(s.done)
+	}
+
+	err := s.closeListeners()
+	for c := range s.connections {
+		c.close()
+		delete(s.connections, c)
+	}
+
+	return err
+}
+
+func (s *Server) addListener(l net.Listener) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	s.listeners[l] = struct{}{}
+}
+
+func (s *Server) closeListener(l net.Listener) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	return s.closeListenerLocked(l)
+}
+
+func (s *Server) closeListenerLocked(l net.Listener) error {
+	defer delete(s.listeners, l)
+	return l.Close()
+}
+
+func (s *Server) closeListeners() error {
+	var err error
+	for l := range s.listeners {
+		if cerr := s.closeListenerLocked(l); cerr != nil && err == nil {
+			err = cerr
+		}
+	}
+	return err
+}
+
+func (s *Server) addConnection(c *serverConn) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	select {
+	case <-s.done:
+		return ErrServerClosed
+	default:
+	}
+
+	s.connections[c] = struct{}{}
+	return nil
+}
+
+func (s *Server) delConnection(c *serverConn) {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	delete(s.connections, c)
+}
+
+func (s *Server) countConnection() int {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	return len(s.connections)
+}
+
+func (s *Server) closeIdleConns() {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	for c := range s.connections {
+		if st, ok := c.getState(); !ok || st == connStateActive {
+			continue
+		}
+		c.close()
+		delete(s.connections, c)
+	}
+}
+
+type connState int
+
+const (
+	connStateActive = iota + 1 // outstanding requests
+	connStateIdle              // no requests
+	connStateClosed            // closed connection
+)
+
+func (cs connState) String() string {
+	switch cs {
+	case connStateActive:
+		return "active"
+	case connStateIdle:
+		return "idle"
+	case connStateClosed:
+		return "closed"
+	default:
+		return "unknown"
+	}
+}
+
+func (s *Server) newConn(conn net.Conn, handshake interface{}) (*serverConn, error) {
+	c := &serverConn{
+		server:    s,
+		conn:      conn,
+		handshake: handshake,
+		shutdown:  make(chan struct{}),
+	}
+	c.setState(connStateIdle)
+	if err := s.addConnection(c); err != nil {
+		c.close()
+		return nil, err
+	}
+	return c, nil
+}
+
+type serverConn struct {
+	server    *Server
+	conn      net.Conn
+	handshake interface{} // data from handshake, not used for now
+	state     atomic.Value
+
+	shutdownOnce sync.Once
+	shutdown     chan struct{} // forced shutdown, used by close
+}
+
+func (c *serverConn) getState() (connState, bool) {
+	cs, ok := c.state.Load().(connState)
+	return cs, ok
+}
+
+func (c *serverConn) setState(newstate connState) {
+	c.state.Store(newstate)
+}
+
+func (c *serverConn) close() error {
+	c.shutdownOnce.Do(func() {
+		close(c.shutdown)
+	})
+
+	return nil
+}
+
+func (c *serverConn) run(sctx context.Context) {
+	type (
+		response struct {
+			id          uint32
+			status      *status.Status
+			data        []byte
+			closeStream bool
+			streaming   bool
+		}
+	)
+
+	var (
+		ch                     = newChannel(c.conn)
+		ctx, cancel            = context.WithCancel(sctx)
+		state        connState = connStateIdle
+		responses              = make(chan response)
+		recvErr                = make(chan error, 1)
+		done                   = make(chan struct{})
+		streams                = sync.Map{}
+		active       int32
+		lastStreamID uint32
+	)
+
+	defer c.conn.Close()
+	defer cancel()
+	defer close(done)
+	defer c.server.delConnection(c)
+
+	sendStatus := func(id uint32, st *status.Status) bool {
+		select {
+		case responses <- response{
+			// even though we've had an invalid stream id, we send it
+			// back on the same stream id so the client knows which
+			// stream id was bad.
+			id:          id,
+			status:      st,
+			closeStream: true,
+		}:
+			return true
+		case <-c.shutdown:
+			return false
+		case <-done:
+			return false
+		}
+	}
+
+	go func(recvErr chan error) {
+		defer close(recvErr)
+		for {
+			select {
+			case <-c.shutdown:
+				return
+			case <-done:
+				return
+			default: // proceed
+			}
+
+			mh, p, err := ch.recv()
+			if err != nil {
+				status, ok := status.FromError(err)
+				if !ok {
+					recvErr <- err
+					return
+				}
+
+				// in this case, we send an error for that particular message
+				// when the status is defined.
+				if !sendStatus(mh.StreamID, status) {
+					return
+				}
+
+				continue
+			}
+
+			if mh.StreamID%2 != 1 {
+				// enforce odd client initiated identifiers.
+				if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "StreamID must be odd for client initiated streams")) {
+					return
+				}
+				continue
+			}
+
+			if mh.Type == messageTypeData {
+				i, ok := streams.Load(mh.StreamID)
+				if !ok {
+					if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "StreamID is no longer active")) {
+						return
+					}
+				}
+				sh := i.(*streamHandler)
+				if mh.Flags&flagNoData != flagNoData {
+					unmarshal := func(obj interface{}) error {
+						err := protoUnmarshal(p, obj)
+						ch.putmbuf(p)
+						return err
+					}
+
+					if err := sh.data(unmarshal); err != nil {
+						if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "data handling error: %v", err)) {
+							return
+						}
+					}
+				}
+
+				if mh.Flags&flagRemoteClosed == flagRemoteClosed {
+					sh.closeSend()
+					if len(p) > 0 {
+						if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "data close message cannot include data")) {
+							return
+						}
+					}
+				}
+			} else if mh.Type == messageTypeRequest {
+				if mh.StreamID <= lastStreamID {
+					// enforce odd client initiated identifiers.
+					if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "StreamID cannot be re-used and must increment")) {
+						return
+					}
+					continue
+
+				}
+				lastStreamID = mh.StreamID
+
+				// TODO: Make request type configurable
+				// Unmarshaller which takes in a byte array and returns an interface?
+				var req Request
+				if err := c.server.codec.Unmarshal(p, &req); err != nil {
+					ch.putmbuf(p)
+					if !sendStatus(mh.StreamID, status.Newf(codes.InvalidArgument, "unmarshal request error: %v", err)) {
+						return
+					}
+					continue
+				}
+				ch.putmbuf(p)
+
+				id := mh.StreamID
+				respond := func(status *status.Status, data []byte, streaming, closeStream bool) error {
+					select {
+					case responses <- response{
+						id:          id,
+						status:      status,
+						data:        data,
+						closeStream: closeStream,
+						streaming:   streaming,
+					}:
+					case <-done:
+						return ErrClosed
+					}
+					return nil
+				}
+				sh, err := c.server.services.handle(ctx, &req, respond)
+				if err != nil {
+					status, _ := status.FromError(err)
+					if !sendStatus(mh.StreamID, status) {
+						return
+					}
+					continue
+				}
+
+				streams.Store(id, sh)
+				atomic.AddInt32(&active, 1)
+			}
+			// TODO: else we must ignore this for future compat. log this?
+		}
+	}(recvErr)
+
+	for {
+		var (
+			newstate connState
+			shutdown chan struct{}
+		)
+
+		activeN := atomic.LoadInt32(&active)
+		if activeN > 0 {
+			newstate = connStateActive
+			shutdown = nil
+		} else {
+			newstate = connStateIdle
+			shutdown = c.shutdown // only enable this branch in idle mode
+		}
+		if newstate != state {
+			c.setState(newstate)
+			state = newstate
+		}
+
+		select {
+		case response := <-responses:
+			if !response.streaming || response.status.Code() != codes.OK {
+				p, err := c.server.codec.Marshal(&Response{
+					Status:  response.status.Proto(),
+					Payload: response.data,
+				})
+				if err != nil {
+					logrus.WithError(err).Error("failed marshaling response")
+					return
+				}
+
+				if err := ch.send(response.id, messageTypeResponse, 0, p); err != nil {
+					logrus.WithError(err).Error("failed sending message on channel")
+					return
+				}
+			} else {
+				var flags uint8
+				if response.closeStream {
+					flags = flagRemoteClosed
+				}
+				if response.data == nil {
+					flags = flags | flagNoData
+				}
+				if err := ch.send(response.id, messageTypeData, flags, response.data); err != nil {
+					logrus.WithError(err).Error("failed sending message on channel")
+					return
+				}
+			}
+
+			if response.closeStream {
+				// The ttrpc protocol currently does not support the case where
+				// the server is localClosed but not remoteClosed. Once the server
+				// is closing, the whole stream may be considered finished
+				streams.Delete(response.id)
+				atomic.AddInt32(&active, -1)
+			}
+		case err := <-recvErr:
+			// TODO(stevvooe): Not wildly clear what we should do in this
+			// branch. Basically, it means that we are no longer receiving
+			// requests due to a terminal error.
+			recvErr = nil // connection is now "closing"
+			if errors.Is(err, io.EOF) || errors.Is(err, io.ErrUnexpectedEOF) || errors.Is(err, syscall.ECONNRESET) {
+				// The client went away and we should stop processing
+				// requests, so that the client connection is closed
+				return
+			}
+			logrus.WithError(err).Error("error receiving message")
+			// else, initiate shutdown
+		case <-shutdown:
+			return
+		}
+	}
+}
+
+var noopFunc = func() {}
+
+func getRequestContext(ctx context.Context, req *Request) (retCtx context.Context, cancel func()) {
+	if len(req.Metadata) > 0 {
+		md := MD{}
+		md.fromRequest(req)
+		ctx = WithMetadata(ctx, md)
+	}
+
+	cancel = noopFunc
+	if req.TimeoutNano == 0 {
+		return ctx, cancel
+	}
+
+	ctx, cancel = context.WithTimeout(ctx, time.Duration(req.TimeoutNano))
+	return ctx, cancel
+}

vendor/github.com/containerd/ttrpc/services.go

@@ -0,0 +1,275 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"os"
+	"path"
+	"unsafe"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/proto"
+)
+
+type Method func(ctx context.Context, unmarshal func(interface{}) error) (interface{}, error)
+
+type StreamHandler func(context.Context, StreamServer) (interface{}, error)
+
+type Stream struct {
+	Handler         StreamHandler
+	StreamingClient bool
+	StreamingServer bool
+}
+
+type ServiceDesc struct {
+	Methods map[string]Method
+	Streams map[string]Stream
+}
+
+type serviceSet struct {
+	services          map[string]*ServiceDesc
+	unaryInterceptor  UnaryServerInterceptor
+	streamInterceptor StreamServerInterceptor
+}
+
+func newServiceSet(interceptor UnaryServerInterceptor) *serviceSet {
+	return &serviceSet{
+		services:          make(map[string]*ServiceDesc),
+		unaryInterceptor:  interceptor,
+		streamInterceptor: defaultStreamServerInterceptor,
+	}
+}
+
+func (s *serviceSet) register(name string, desc *ServiceDesc) {
+	if _, ok := s.services[name]; ok {
+		panic(fmt.Errorf("duplicate service %v registered", name))
+	}
+
+	s.services[name] = desc
+}
+
+func (s *serviceSet) unaryCall(ctx context.Context, method Method, info *UnaryServerInfo, data []byte) (p []byte, st *status.Status) {
+	unmarshal := func(obj interface{}) error {
+		return protoUnmarshal(data, obj)
+	}
+
+	resp, err := s.unaryInterceptor(ctx, unmarshal, info, method)
+	if err == nil {
+		if isNil(resp) {
+			err = errors.New("ttrpc: marshal called with nil")
+		} else {
+			p, err = protoMarshal(resp)
+		}
+	}
+
+	st, ok := status.FromError(err)
+	if !ok {
+		st = status.New(convertCode(err), err.Error())
+	}
+
+	return p, st
+}
+
+func (s *serviceSet) streamCall(ctx context.Context, stream StreamHandler, info *StreamServerInfo, ss StreamServer) (p []byte, st *status.Status) {
+	resp, err := s.streamInterceptor(ctx, ss, info, stream)
+	if err == nil {
+		p, err = protoMarshal(resp)
+	}
+	st, ok := status.FromError(err)
+	if !ok {
+		st = status.New(convertCode(err), err.Error())
+	}
+	return
+}
+
+func (s *serviceSet) handle(ctx context.Context, req *Request, respond func(*status.Status, []byte, bool, bool) error) (*streamHandler, error) {
+	srv, ok := s.services[req.Service]
+	if !ok {
+		return nil, status.Errorf(codes.Unimplemented, "service %v", req.Service)
+	}
+
+	if method, ok := srv.Methods[req.Method]; ok {
+		go func() {
+			ctx, cancel := getRequestContext(ctx, req)
+			defer cancel()
+
+			info := &UnaryServerInfo{
+				FullMethod: fullPath(req.Service, req.Method),
+			}
+			p, st := s.unaryCall(ctx, method, info, req.Payload)
+
+			respond(st, p, false, true)
+		}()
+		return nil, nil
+	}
+	if stream, ok := srv.Streams[req.Method]; ok {
+		ctx, cancel := getRequestContext(ctx, req)
+		info := &StreamServerInfo{
+			FullMethod:      fullPath(req.Service, req.Method),
+			StreamingClient: stream.StreamingClient,
+			StreamingServer: stream.StreamingServer,
+		}
+		sh := &streamHandler{
+			ctx:     ctx,
+			respond: respond,
+			recv:    make(chan Unmarshaler, 5),
+			info:    info,
+		}
+		go func() {
+			defer cancel()
+			p, st := s.streamCall(ctx, stream.Handler, info, sh)
+			respond(st, p, stream.StreamingServer, true)
+		}()
+
+		if req.Payload != nil {
+			unmarshal := func(obj interface{}) error {
+				return protoUnmarshal(req.Payload, obj)
+			}
+			if err := sh.data(unmarshal); err != nil {
+				return nil, err
+			}
+		}
+
+		return sh, nil
+	}
+	return nil, status.Errorf(codes.Unimplemented, "method %v", req.Method)
+}
+
+type streamHandler struct {
+	ctx     context.Context
+	respond func(*status.Status, []byte, bool, bool) error
+	recv    chan Unmarshaler
+	info    *StreamServerInfo
+
+	remoteClosed bool
+	localClosed  bool
+}
+
+func (s *streamHandler) closeSend() {
+	if !s.remoteClosed {
+		s.remoteClosed = true
+		close(s.recv)
+	}
+}
+
+func (s *streamHandler) data(unmarshal Unmarshaler) error {
+	if s.remoteClosed {
+		return ErrStreamClosed
+	}
+	select {
+	case s.recv <- unmarshal:
+		return nil
+	case <-s.ctx.Done():
+		return s.ctx.Err()
+	}
+}
+
+func (s *streamHandler) SendMsg(m interface{}) error {
+	if s.localClosed {
+		return ErrStreamClosed
+	}
+	p, err := protoMarshal(m)
+	if err != nil {
+		return err
+	}
+	return s.respond(nil, p, true, false)
+}
+
+func (s *streamHandler) RecvMsg(m interface{}) error {
+	select {
+	case unmarshal, ok := <-s.recv:
+		if !ok {
+			return io.EOF
+		}
+		return unmarshal(m)
+	case <-s.ctx.Done():
+		return s.ctx.Err()
+
+	}
+}
+
+func protoUnmarshal(p []byte, obj interface{}) error {
+	switch v := obj.(type) {
+	case proto.Message:
+		if err := proto.Unmarshal(p, v); err != nil {
+			return status.Errorf(codes.Internal, "ttrpc: error unmarshalling payload: %v", err.Error())
+		}
+	default:
+		return status.Errorf(codes.Internal, "ttrpc: error unsupported request type: %T", v)
+	}
+	return nil
+}
+
+func protoMarshal(obj interface{}) ([]byte, error) {
+	if obj == nil {
+		return nil, nil
+	}
+
+	switch v := obj.(type) {
+	case proto.Message:
+		r, err := proto.Marshal(v)
+		if err != nil {
+			return nil, status.Errorf(codes.Internal, "ttrpc: error marshaling payload: %v", err.Error())
+		}
+
+		return r, nil
+	default:
+		return nil, status.Errorf(codes.Internal, "ttrpc: error unsupported response type: %T", v)
+	}
+}
+
+// convertCode maps stdlib go errors into grpc space.
+//
+// This is ripped from the grpc-go code base.
+func convertCode(err error) codes.Code {
+	switch err {
+	case nil:
+		return codes.OK
+	case io.EOF:
+		return codes.OutOfRange
+	case io.ErrClosedPipe, io.ErrNoProgress, io.ErrShortBuffer, io.ErrShortWrite, io.ErrUnexpectedEOF:
+		return codes.FailedPrecondition
+	case os.ErrInvalid:
+		return codes.InvalidArgument
+	case context.Canceled:
+		return codes.Canceled
+	case context.DeadlineExceeded:
+		return codes.DeadlineExceeded
+	}
+	switch {
+	case os.IsExist(err):
+		return codes.AlreadyExists
+	case os.IsNotExist(err):
+		return codes.NotFound
+	case os.IsPermission(err):
+		return codes.PermissionDenied
+	}
+	return codes.Unknown
+}
+
+func fullPath(service, method string) string {
+	return "/" + path.Join(service, method)
+}
+
+func isNil(resp interface{}) bool {
+	return (*[2]uintptr)(unsafe.Pointer(&resp))[1] == 0
+}

vendor/github.com/containerd/ttrpc/stream.go

@@ -0,0 +1,84 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"sync"
+)
+
+type streamID uint32
+
+type streamMessage struct {
+	header  messageHeader
+	payload []byte
+}
+
+type stream struct {
+	id     streamID
+	sender sender
+	recv   chan *streamMessage
+
+	closeOnce sync.Once
+	recvErr   error
+	recvClose chan struct{}
+}
+
+func newStream(id streamID, send sender) *stream {
+	return &stream{
+		id:        id,
+		sender:    send,
+		recv:      make(chan *streamMessage, 1),
+		recvClose: make(chan struct{}),
+	}
+}
+
+func (s *stream) closeWithError(err error) error {
+	s.closeOnce.Do(func() {
+		if err != nil {
+			s.recvErr = err
+		} else {
+			s.recvErr = ErrClosed
+		}
+		close(s.recvClose)
+	})
+	return nil
+}
+
+func (s *stream) send(mt messageType, flags uint8, b []byte) error {
+	return s.sender.send(uint32(s.id), mt, flags, b)
+}
+
+func (s *stream) receive(ctx context.Context, msg *streamMessage) error {
+	select {
+	case <-s.recvClose:
+		return s.recvErr
+	default:
+	}
+	select {
+	case <-s.recvClose:
+		return s.recvErr
+	case s.recv <- msg:
+		return nil
+	case <-ctx.Done():
+		return ctx.Err()
+	}
+}
+
+type sender interface {
+	send(uint32, messageType, uint8, []byte) error
+}

vendor/github.com/containerd/ttrpc/stream_server.go

@@ -0,0 +1,22 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+type StreamServer interface {
+	SendMsg(m interface{}) error
+	RecvMsg(m interface{}) error
+}

vendor/github.com/containerd/ttrpc/test.proto

@@ -0,0 +1,16 @@
+syntax = "proto3";
+
+package ttrpc;
+
+option go_package = "github.com/containerd/ttrpc/internal";
+
+message TestPayload {
+	string foo = 1;
+	int64 deadline = 2;
+	string metadata = 3;
+}
+
+message EchoPayload {
+	int64 seq = 1;
+	string msg = 2;
+}

vendor/github.com/containerd/ttrpc/unixcreds_linux.go

@@ -0,0 +1,105 @@
+/*
+   Copyright The containerd Authors.
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+package ttrpc
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+type UnixCredentialsFunc func(*unix.Ucred) error
+
+func (fn UnixCredentialsFunc) Handshake(_ context.Context, conn net.Conn) (net.Conn, interface{}, error) {
+	uc, err := requireUnixSocket(conn)
+	if err != nil {
+		return nil, nil, fmt.Errorf("ttrpc.UnixCredentialsFunc: require unix socket: %w", err)
+	}
+
+	rs, err := uc.SyscallConn()
+	if err != nil {
+		return nil, nil, fmt.Errorf("ttrpc.UnixCredentialsFunc: (net.UnixConn).SyscallConn failed: %w", err)
+	}
+	var (
+		ucred    *unix.Ucred
+		ucredErr error
+	)
+	if err := rs.Control(func(fd uintptr) {
+		ucred, ucredErr = unix.GetsockoptUcred(int(fd), unix.SOL_SOCKET, unix.SO_PEERCRED)
+	}); err != nil {
+		return nil, nil, fmt.Errorf("ttrpc.UnixCredentialsFunc: (*syscall.RawConn).Control failed: %w", err)
+	}
+
+	if ucredErr != nil {
+		return nil, nil, fmt.Errorf("ttrpc.UnixCredentialsFunc: failed to retrieve socket peer credentials: %w", ucredErr)
+	}
+
+	if err := fn(ucred); err != nil {
+		return nil, nil, fmt.Errorf("ttrpc.UnixCredentialsFunc: credential check failed: %w", err)
+	}
+
+	return uc, ucred, nil
+}
+
+// UnixSocketRequireUidGid requires specific *effective* UID/GID, rather than the real UID/GID.
+//
+// For example, if a daemon binary is owned by the root (UID 0) with SUID bit but running as an
+// unprivileged user (UID 1001), the effective UID becomes 0, and the real UID becomes 1001.
+// So calling this function with uid=0 allows a connection from effective UID 0 but rejects
+// a connection from effective UID 1001.
+//
+// See socket(7), SO_PEERCRED: "The returned credentials are those that were in effect at the time of the call to connect(2) or socketpair(2)."
+func UnixSocketRequireUidGid(uid, gid int) UnixCredentialsFunc {
+	return func(ucred *unix.Ucred) error {
+		return requireUidGid(ucred, uid, gid)
+	}
+}
+
+func UnixSocketRequireRoot() UnixCredentialsFunc {
+	return UnixSocketRequireUidGid(0, 0)
+}
+
+// UnixSocketRequireSameUser resolves the current effective unix user and returns a
+// UnixCredentialsFunc that will validate incoming unix connections against the
+// current credentials.
+//
+// This is useful when using abstract sockets that are accessible by all users.
+func UnixSocketRequireSameUser() UnixCredentialsFunc {
+	euid, egid := os.Geteuid(), os.Getegid()
+	return UnixSocketRequireUidGid(euid, egid)
+}
+
+func requireUidGid(ucred *unix.Ucred, uid, gid int) error {
+	if (uid != -1 && uint32(uid) != ucred.Uid) || (gid != -1 && uint32(gid) != ucred.Gid) {
+		return fmt.Errorf("ttrpc: invalid credentials: %v", syscall.EPERM)
+	}
+	return nil
+}
+
+func requireUnixSocket(conn net.Conn) (*net.UnixConn, error) {
+	uc, ok := conn.(*net.UnixConn)
+	if !ok {
+		return nil, errors.New("a unix socket connection is required")
+	}
+
+	return uc, nil
+}

vendor/github.com/moby/buildkit/client/client.go

@@ -25,6 +25,7 @@ import (
 	sdktrace "go.opentelemetry.io/otel/sdk/trace"
 	"go.opentelemetry.io/otel/trace"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/credentials"
 	"google.golang.org/grpc/credentials/insecure"
 )
@@ -184,6 +185,19 @@ func (c *Client) Dialer() session.Dialer {
 	return grpchijack.Dialer(c.ControlClient())
 }
 
+func (c *Client) Wait(ctx context.Context) error {
+	opts := []grpc.CallOption{grpc.WaitForReady(true)}
+	_, err := c.ControlClient().Info(ctx, &controlapi.InfoRequest{}, opts...)
+	if err != nil {
+		if code := grpcerrors.Code(err); code == codes.Unimplemented {
+			// only buildkit v0.11+ supports the info api, but an unimplemented
+			// response error is still a response so we can ignore it
+			return nil
+		}
+	}
+	return err
+}
+
 func (c *Client) Close() error {
 	return c.conn.Close()
 }

vendor/github.com/moby/buildkit/client/llb/async.go

@@ -15,7 +15,7 @@ type asyncState struct {
 	target State
 	set    bool
 	err    error
-	g      flightcontrol.Group
+	g      flightcontrol.Group[State]
 }
 
 func (as *asyncState) Output() Output {
@@ -53,7 +53,7 @@ func (as *asyncState) ToInput(ctx context.Context, c *Constraints) (*pb.Input, e
 }
 
 func (as *asyncState) Do(ctx context.Context, c *Constraints) error {
-	_, err := as.g.Do(ctx, "", func(ctx context.Context) (interface{}, error) {
+	_, err := as.g.Do(ctx, "", func(ctx context.Context) (State, error) {
 		if as.set {
 			return as.target, as.err
 		}

vendor/github.com/moby/buildkit/client/llb/fileop.go

@@ -145,6 +145,7 @@ func Mkdir(p string, m os.FileMode, opt ...MkdirOption) *FileAction {
 	for _, o := range opt {
 		o.SetMkdirOption(&mi)
 	}
+
 	return &FileAction{
 		action: &fileActionMkdir{
 			file: p,
@@ -447,7 +448,6 @@ func Copy(input CopyInput, src, dest string, opts ...CopyOption) *FileAction {
 	for _, o := range opts {
 		o.SetCopyOption(&mi)
 	}
-
 	return &FileAction{
 		action: &fileActionCopy{
 			state: state,
@@ -523,22 +523,19 @@ func (a *fileActionCopy) toProtoAction(ctx context.Context, parent string, base
 
 func (a *fileActionCopy) sourcePath(ctx context.Context) (string, error) {
 	p := path.Clean(a.src)
+	dir := "/"
+	var err error
 	if !path.IsAbs(p) {
 		if a.state != nil {
-			dir, err := a.state.GetDir(ctx)
+			dir, err = a.state.GetDir(ctx)
-			if err != nil {
-				return "", err
-			}
-			p = path.Join("/", dir, p)
 		} else if a.fas != nil {
-			dir, err := a.fas.state.GetDir(ctx)
+			dir, err = a.fas.state.GetDir(ctx)
+		}
 		if err != nil {
 			return "", err
 		}
-			p = path.Join("/", dir, p)
 	}
-	}
+	return path.Join(dir, p), nil
-	return p, nil
 }
 
 func (a *fileActionCopy) addCaps(f *FileOp) {

vendor/github.com/moby/buildkit/client/llb/meta.go

@@ -10,6 +10,7 @@ import (
 	"github.com/google/shlex"
 	"github.com/moby/buildkit/solver/pb"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
 )
 
 type contextKeyT string
@@ -78,7 +79,7 @@ func dirf(value string, replace bool, v ...interface{}) StateOption {
 			if !path.IsAbs(value) {
 				prev, err := getDir(s)(ctx, c)
 				if err != nil {
-					return nil, err
+					return nil, errors.Wrap(err, "getting dir from state")
 				}
 				if prev == "" {
 					prev = "/"

vendor/github.com/moby/buildkit/client/llb/resolver.go

@@ -3,6 +3,7 @@ package llb
 import (
 	"context"
 
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
 	digest "github.com/opencontainers/go-digest"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 )
@@ -31,7 +32,7 @@ func WithLayerLimit(l int) ImageOption {
 
 // ImageMetaResolver can resolve image config metadata from a reference
 type ImageMetaResolver interface {
-	ResolveImageConfig(ctx context.Context, ref string, opt ResolveImageConfigOpt) (digest.Digest, []byte, error)
+	ResolveImageConfig(ctx context.Context, ref string, opt ResolveImageConfigOpt) (string, digest.Digest, []byte, error)
 }
 
 type ResolverType int
@@ -49,6 +50,8 @@ type ResolveImageConfigOpt struct {
 	LogName     string
 
 	Store ResolveImageConfigOptStore
+
+	SourcePolicies []*spb.Policy
 }
 
 type ResolveImageConfigOptStore struct {

vendor/github.com/moby/buildkit/client/llb/source.go

@@ -135,7 +135,7 @@ func Image(ref string, opts ...ImageOption) State {
 				if p == nil {
 					p = c.Platform
 				}
-				_, dt, err := info.metaResolver.ResolveImageConfig(ctx, ref, ResolveImageConfigOpt{
+				_, _, dt, err := info.metaResolver.ResolveImageConfig(ctx, ref, ResolveImageConfigOpt{
 					Platform:     p,
 					ResolveMode:  info.resolveMode.String(),
 					ResolverType: ResolverTypeRegistry,
@@ -151,7 +151,7 @@ func Image(ref string, opts ...ImageOption) State {
 			if p == nil {
 				p = c.Platform
 			}
-			dgst, dt, err := info.metaResolver.ResolveImageConfig(context.TODO(), ref, ResolveImageConfigOpt{
+			ref, dgst, dt, err := info.metaResolver.ResolveImageConfig(context.TODO(), ref, ResolveImageConfigOpt{
 				Platform:     p,
 				ResolveMode:  info.resolveMode.String(),
 				ResolverType: ResolverTypeRegistry,
@@ -159,6 +159,10 @@ func Image(ref string, opts ...ImageOption) State {
 			if err != nil {
 				return State{}, err
 			}
+			r, err := reference.ParseNormalizedNamed(ref)
+			if err != nil {
+				return State{}, err
+			}
 			if dgst != "" {
 				r, err = reference.WithDigest(r, dgst)
 				if err != nil {

vendor/github.com/moby/buildkit/exporter/containerimage/image/docker_image.go

@@ -22,6 +22,7 @@ type HealthConfig struct {
 	Interval      time.Duration `json:",omitempty"` // Interval is the time to wait between checks.
 	Timeout       time.Duration `json:",omitempty"` // Timeout is the time to wait before considering the check to have hung.
 	StartPeriod   time.Duration `json:",omitempty"` // The start period for the container to initialize before the retries starts to count down.
+	StartInterval time.Duration `json:",omitempty"` // StartInterval is the time to wait between checks during the start period.
 
 	// Retries is the number of consecutive failures needed to consider a container as unhealthy.
 	// Zero means inherit.

vendor/github.com/moby/buildkit/frontend/dockerui/config.go

@@ -19,6 +19,7 @@ import (
 	"github.com/moby/buildkit/frontend/gateway/client"
 	"github.com/moby/buildkit/solver/pb"
 	"github.com/moby/buildkit/util/flightcontrol"
+	digest "github.com/opencontainers/go-digest"
 	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
 )
@@ -76,7 +77,7 @@ type Client struct {
 	client      client.Client
 	ignoreCache []string
 	bctx        *buildContext
-	g           flightcontrol.Group
+	g           flightcontrol.Group[*buildContext]
 	bopts       client.BuildOpts
 
 	dockerignore []byte
@@ -96,6 +97,7 @@ type ContextOpt struct {
 	LocalOpts      []llb.LocalOption
 	Platform       *ocispecs.Platform
 	ResolveMode    string
+	CaptureDigest  *digest.Digest
 }
 
 func validateMinCaps(c client.Client) error {
@@ -278,7 +280,7 @@ func (bc *Client) init() error {
 }
 
 func (bc *Client) buildContext(ctx context.Context) (*buildContext, error) {
-	bctx, err := bc.g.Do(ctx, "initcontext", func(ctx context.Context) (interface{}, error) {
+	return bc.g.Do(ctx, "initcontext", func(ctx context.Context) (*buildContext, error) {
 		if bc.bctx != nil {
 			return bc.bctx, nil
 		}
@@ -288,10 +290,6 @@ func (bc *Client) buildContext(ctx context.Context) (*buildContext, error) {
 		}
 		return bctx, err
 	})
-	if err != nil {
-		return nil, err
-	}
-	return bctx.(*buildContext), nil
 }
 
 func (bc *Client) ReadEntrypoint(ctx context.Context, lang string, opts ...llb.LocalOption) (*Source, error) {

vendor/github.com/moby/buildkit/frontend/dockerui/namedcontext.go

@@ -13,25 +13,36 @@ import (
 	"github.com/moby/buildkit/exporter/containerimage/image"
 	"github.com/moby/buildkit/frontend/dockerfile/dockerignore"
 	"github.com/moby/buildkit/frontend/gateway/client"
+	"github.com/moby/buildkit/util/imageutil"
 	"github.com/pkg/errors"
 )
 
 const (
 	contextPrefix       = "context:"
 	inputMetadataPrefix = "input-metadata:"
+	maxContextRecursion = 10
 )
 
 func (bc *Client) namedContext(ctx context.Context, name string, nameWithPlatform string, opt ContextOpt) (*llb.State, *image.Image, error) {
+	return bc.namedContextRecursive(ctx, name, nameWithPlatform, opt, 0)
+}
+
+func (bc *Client) namedContextRecursive(ctx context.Context, name string, nameWithPlatform string, opt ContextOpt, count int) (*llb.State, *image.Image, error) {
 	opts := bc.bopts.Opts
 	v, ok := opts[contextPrefix+nameWithPlatform]
 	if !ok {
 		return nil, nil, nil
 	}
 
+	if count > maxContextRecursion {
+		return nil, nil, errors.New("context recursion limit exceeded; this may indicate a cycle in the provided source policies: " + v)
+	}
+
 	vv := strings.SplitN(v, ":", 2)
 	if len(vv) != 2 {
 		return nil, nil, errors.Errorf("invalid context specifier %s for %s", v, nameWithPlatform)
 	}
+
 	// allow git@ without protocol for SSH URLs for backwards compatibility
 	if strings.HasPrefix(vv[0], "git@") {
 		vv[0] = "git"
@@ -58,13 +69,17 @@ func (bc *Client) namedContext(ctx context.Context, name string, nameWithPlatfor
 
 		named = reference.TagNameOnly(named)
 
-		_, data, err := bc.client.ResolveImageConfig(ctx, named.String(), llb.ResolveImageConfigOpt{
+		ref, dgst, data, err := bc.client.ResolveImageConfig(ctx, named.String(), llb.ResolveImageConfigOpt{
 			Platform:     opt.Platform,
 			ResolveMode:  opt.ResolveMode,
 			LogName:      fmt.Sprintf("[context %s] load metadata for %s", nameWithPlatform, ref),
 			ResolverType: llb.ResolverTypeRegistry,
 		})
 		if err != nil {
+			e := &imageutil.ResolveToNonImageError{}
+			if errors.As(err, &e) {
+				return bc.namedContextRecursive(ctx, e.Updated, name, opt, count+1)
+			}
 			return nil, nil, err
 		}
 
@@ -79,6 +94,9 @@ func (bc *Client) namedContext(ctx context.Context, name string, nameWithPlatfor
 		if err != nil {
 			return nil, nil, err
 		}
+		if opt.CaptureDigest != nil {
+			*opt.CaptureDigest = dgst
+		}
 		return &st, &img, nil
 	case "git":
 		st, ok := DetectGitContext(v, true)
@@ -119,7 +137,8 @@ func (bc *Client) namedContext(ctx context.Context, name string, nameWithPlatfor
 			return nil, nil, errors.Wrapf(err, "could not wrap %q with digest", name)
 		}
 
-		_, data, err := bc.client.ResolveImageConfig(ctx, dummyRef.String(), llb.ResolveImageConfigOpt{
+		// TODO: How should source policy be handled here with a dummy ref?
+		_, dgst, data, err := bc.client.ResolveImageConfig(ctx, dummyRef.String(), llb.ResolveImageConfigOpt{
 			Platform:     opt.Platform,
 			ResolveMode:  opt.ResolveMode,
 			LogName:      fmt.Sprintf("[context %s] load metadata for %s", nameWithPlatform, dummyRef.String()),
@@ -153,6 +172,9 @@ func (bc *Client) namedContext(ctx context.Context, name string, nameWithPlatfor
 		if err != nil {
 			return nil, nil, err
 		}
+		if opt.CaptureDigest != nil {
+			*opt.CaptureDigest = dgst
+		}
 		return &st, &img, nil
 	case "local":
 		st := llb.Local(vv[1],

vendor/github.com/moby/buildkit/frontend/gateway/client/client.go

@@ -27,7 +27,7 @@ func NewResult() *Result {
 
 type Client interface {
 	Solve(ctx context.Context, req SolveRequest) (*Result, error)
-	ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt) (digest.Digest, []byte, error)
+	ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt) (string, digest.Digest, []byte, error)
 	BuildOpts() BuildOpts
 	Inputs(ctx context.Context) (map[string]llb.State, error)
 	NewContainer(ctx context.Context, req NewContainerRequest) (Container, error)
@@ -71,6 +71,7 @@ type Container interface {
 type StartRequest struct {
 	Args           []string
 	Env            []string
+	SecretEnv      []*pb.SecretEnv
 	User           string
 	Cwd            string
 	Tty            bool

vendor/github.com/moby/buildkit/frontend/gateway/grpcclient/client.go

@@ -478,7 +478,7 @@ func (c *grpcClient) Solve(ctx context.Context, creq client.SolveRequest) (res *
 	return res, nil
 }
 
-func (c *grpcClient) ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt) (digest.Digest, []byte, error) {
+func (c *grpcClient) ResolveImageConfig(ctx context.Context, ref string, opt llb.ResolveImageConfigOpt) (string, digest.Digest, []byte, error) {
 	var p *opspb.Platform
 	if platform := opt.Platform; platform != nil {
 		p = &opspb.Platform{
@@ -489,6 +489,7 @@ func (c *grpcClient) ResolveImageConfig(ctx context.Context, ref string, opt llb
 			OSFeatures:   platform.OSFeatures,
 		}
 	}
+
 	resp, err := c.client.ResolveImageConfig(ctx, &pb.ResolveImageConfigRequest{
 		ResolverType:   int32(opt.ResolverType),
 		Ref:            ref,
@@ -497,11 +498,18 @@ func (c *grpcClient) ResolveImageConfig(ctx context.Context, ref string, opt llb
 		LogName:        opt.LogName,
 		SessionID:      opt.Store.SessionID,
 		StoreID:        opt.Store.StoreID,
+		SourcePolicies: opt.SourcePolicies,
 	})
 	if err != nil {
-		return "", nil, err
+		return "", "", nil, err
 	}
-	return resp.Digest, resp.Config, nil
+	newRef := resp.Ref
+	if newRef == "" {
+		// No ref returned, use the original one.
+		// This could occur if the version of buildkitd is too old.
+		newRef = ref
+	}
+	return newRef, resp.Digest, resp.Config, nil
 }
 
 func (c *grpcClient) BuildOpts() client.BuildOpts {
@@ -806,6 +814,7 @@ func (c *grpcClient) NewContainer(ctx context.Context, req client.NewContainerRe
 
 	return &container{
 		client:   c.client,
+		caps:     c.caps,
 		id:       id,
 		execMsgs: c.execMsgs,
 	}, nil
@@ -813,6 +822,7 @@ func (c *grpcClient) NewContainer(ctx context.Context, req client.NewContainerRe
 
 type container struct {
 	client   pb.LLBBridgeClient
+	caps     apicaps.CapSet
 	id       string
 	execMsgs *messageForwarder
 }
@@ -821,6 +831,12 @@ func (ctr *container) Start(ctx context.Context, req client.StartRequest) (clien
 	pid := fmt.Sprintf("%s:%s", ctr.id, identity.NewID())
 	msgs := ctr.execMsgs.Register(pid)
 
+	if len(req.SecretEnv) > 0 {
+		if err := ctr.caps.Supports(pb.CapGatewayExecSecretEnv); err != nil {
+			return nil, err
+		}
+	}
+
 	init := &pb.InitMessage{
 		ContainerID: ctr.id,
 		Meta: &opspb.Meta{
@@ -831,6 +847,7 @@ func (ctr *container) Start(ctx context.Context, req client.StartRequest) (clien
 		},
 		Tty:       req.Tty,
 		Security:  req.SecurityMode,
+		Secretenv: req.SecretEnv,
 	}
 	init.Meta.RemoveMountStubsRecursive = req.RemoveMountStubsRecursive
 	if req.Stdin != nil {

vendor/github.com/moby/buildkit/frontend/gateway/pb/caps.go

@@ -44,6 +44,10 @@ const (
 	// /etc/hosts for containers created via gateway exec.
 	CapGatewayExecExtraHosts apicaps.CapID = "gateway.exec.extrahosts"
 
+	// CapGatewayExecExtraHosts is the capability to set secrets as env vars for
+	// containers created via gateway exec.
+	CapGatewayExecSecretEnv apicaps.CapID = "gateway.exec.secretenv"
+
 	// CapGatewayExecExtraHosts is the capability to send signals to a process
 	// created via gateway exec.
 	CapGatewayExecSignals apicaps.CapID = "gateway.exec.signals"
@@ -179,6 +183,13 @@ func init() {
 		Status:  apicaps.CapStatusExperimental,
 	})
 
+	Caps.Init(apicaps.Cap{
+		ID:      CapGatewayExecSecretEnv,
+		Name:    "gateway exec secret env",
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
+
 	Caps.Init(apicaps.Cap{
 		ID:      CapGatewayExecSignals,
 		Name:    "gateway exec signals",

vendor/github.com/moby/buildkit/frontend/gateway/pb/gateway.pb.go

@@ -743,6 +743,7 @@ type ResolveImageConfigRequest struct {
 	ResolverType         int32         `protobuf:"varint,5,opt,name=ResolverType,proto3" json:"ResolverType,omitempty"`
 	SessionID            string        `protobuf:"bytes,6,opt,name=SessionID,proto3" json:"SessionID,omitempty"`
 	StoreID              string        `protobuf:"bytes,7,opt,name=StoreID,proto3" json:"StoreID,omitempty"`
+	SourcePolicies       []*pb1.Policy `protobuf:"bytes,8,rep,name=SourcePolicies,proto3" json:"SourcePolicies,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}      `json:"-"`
 	XXX_unrecognized     []byte        `json:"-"`
 	XXX_sizecache        int32         `json:"-"`
@@ -830,9 +831,17 @@ func (m *ResolveImageConfigRequest) GetStoreID() string {
 	return ""
 }
 
+func (m *ResolveImageConfigRequest) GetSourcePolicies() []*pb1.Policy {
+	if m != nil {
+		return m.SourcePolicies
+	}
+	return nil
+}
+
 type ResolveImageConfigResponse struct {
 	Digest               github_com_opencontainers_go_digest.Digest `protobuf:"bytes,1,opt,name=Digest,proto3,customtype=github.com/opencontainers/go-digest.Digest" json:"Digest"`
 	Config               []byte                                     `protobuf:"bytes,2,opt,name=Config,proto3" json:"Config,omitempty"`
+	Ref                  string                                     `protobuf:"bytes,3,opt,name=Ref,proto3" json:"Ref,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}                                   `json:"-"`
 	XXX_unrecognized     []byte                                     `json:"-"`
 	XXX_sizecache        int32                                      `json:"-"`
@@ -878,6 +887,13 @@ func (m *ResolveImageConfigResponse) GetConfig() []byte {
 	return nil
 }
 
+func (m *ResolveImageConfigResponse) GetRef() string {
+	if m != nil {
+		return m.Ref
+	}
+	return ""
+}
+
 type SolveRequest struct {
 	Definition  *pb.Definition    `protobuf:"bytes,1,opt,name=Definition,proto3" json:"Definition,omitempty"`
 	Frontend    string            `protobuf:"bytes,2,opt,name=Frontend,proto3" json:"Frontend,omitempty"`
@@ -2204,6 +2220,7 @@ type InitMessage struct {
 	Fds                  []uint32        `protobuf:"varint,3,rep,packed,name=Fds,proto3" json:"Fds,omitempty"`
 	Tty                  bool            `protobuf:"varint,4,opt,name=Tty,proto3" json:"Tty,omitempty"`
 	Security             pb.SecurityMode `protobuf:"varint,5,opt,name=Security,proto3,enum=pb.SecurityMode" json:"Security,omitempty"`
+	Secretenv            []*pb.SecretEnv `protobuf:"bytes,6,rep,name=secretenv,proto3" json:"secretenv,omitempty"`
 	XXX_NoUnkeyedLiteral struct{}        `json:"-"`
 	XXX_unrecognized     []byte          `json:"-"`
 	XXX_sizecache        int32           `json:"-"`
@@ -2277,6 +2294,13 @@ func (m *InitMessage) GetSecurity() pb.SecurityMode {
 	return pb.SecurityMode_SANDBOX
 }
 
+func (m *InitMessage) GetSecretenv() []*pb.SecretEnv {
+	if m != nil {
+		return m.Secretenv
+	}
+	return nil
+}
+
 type ExitMessage struct {
 	Code                 uint32      `protobuf:"varint,1,opt,name=Code,proto3" json:"Code,omitempty"`
 	Error                *rpc.Status `protobuf:"bytes,2,opt,name=Error,proto3" json:"Error,omitempty"`
@@ -2635,161 +2659,164 @@ func init() {
 func init() { proto.RegisterFile("gateway.proto", fileDescriptor_f1a937782ebbded5) }
 
 var fileDescriptor_f1a937782ebbded5 = []byte{
-	// 2464 bytes of a gzipped FileDescriptorProto
+	// 2497 bytes of a gzipped FileDescriptorProto
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+	0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -4022,6 +4049,20 @@ func (m *ResolveImageConfigRequest) MarshalToSizedBuffer(dAtA []byte) (int, erro
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if len(m.SourcePolicies) > 0 {
+		for iNdEx := len(m.SourcePolicies) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.SourcePolicies[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintGateway(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0x42
+		}
+	}
 	if len(m.StoreID) > 0 {
 		i -= len(m.StoreID)
 		copy(dAtA[i:], m.StoreID)
@@ -4101,6 +4142,13 @@ func (m *ResolveImageConfigResponse) MarshalToSizedBuffer(dAtA []byte) (int, err
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if len(m.Ref) > 0 {
+		i -= len(m.Ref)
+		copy(dAtA[i:], m.Ref)
+		i = encodeVarintGateway(dAtA, i, uint64(len(m.Ref)))
+		i--
+		dAtA[i] = 0x1a
+	}
 	if len(m.Config) > 0 {
 		i -= len(m.Config)
 		copy(dAtA[i:], m.Config)
@@ -5348,6 +5396,20 @@ func (m *InitMessage) MarshalToSizedBuffer(dAtA []byte) (int, error) {
 		i -= len(m.XXX_unrecognized)
 		copy(dAtA[i:], m.XXX_unrecognized)
 	}
+	if len(m.Secretenv) > 0 {
+		for iNdEx := len(m.Secretenv) - 1; iNdEx >= 0; iNdEx-- {
+			{
+				size, err := m.Secretenv[iNdEx].MarshalToSizedBuffer(dAtA[:i])
+				if err != nil {
+					return 0, err
+				}
+				i -= size
+				i = encodeVarintGateway(dAtA, i, uint64(size))
+			}
+			i--
+			dAtA[i] = 0x32
+		}
+	}
 	if m.Security != 0 {
 		i = encodeVarintGateway(dAtA, i, uint64(m.Security))
 		i--
@@ -5973,6 +6035,12 @@ func (m *ResolveImageConfigRequest) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovGateway(uint64(l))
 	}
+	if len(m.SourcePolicies) > 0 {
+		for _, e := range m.SourcePolicies {
+			l = e.Size()
+			n += 1 + l + sovGateway(uint64(l))
+		}
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -5993,6 +6061,10 @@ func (m *ResolveImageConfigResponse) Size() (n int) {
 	if l > 0 {
 		n += 1 + l + sovGateway(uint64(l))
 	}
+	l = len(m.Ref)
+	if l > 0 {
+		n += 1 + l + sovGateway(uint64(l))
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -6586,6 +6658,12 @@ func (m *InitMessage) Size() (n int) {
 	if m.Security != 0 {
 		n += 1 + sovGateway(uint64(m.Security))
 	}
+	if len(m.Secretenv) > 0 {
+		for _, e := range m.Secretenv {
+			l = e.Size()
+			n += 1 + l + sovGateway(uint64(l))
+		}
+	}
 	if m.XXX_unrecognized != nil {
 		n += len(m.XXX_unrecognized)
 	}
@@ -8819,6 +8897,40 @@ func (m *ResolveImageConfigRequest) Unmarshal(dAtA []byte) error {
 			}
 			m.StoreID = string(dAtA[iNdEx:postIndex])
 			iNdEx = postIndex
+		case 8:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field SourcePolicies", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.SourcePolicies = append(m.SourcePolicies, &pb1.Policy{})
+			if err := m.SourcePolicies[len(m.SourcePolicies)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGateway(dAtA[iNdEx:])
@@ -8936,6 +9048,38 @@ func (m *ResolveImageConfigResponse) Unmarshal(dAtA []byte) error {
 				m.Config = []byte{}
 			}
 			iNdEx = postIndex
+		case 3:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Ref", wireType)
+			}
+			var stringLen uint64
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				stringLen |= uint64(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			intStringLen := int(stringLen)
+			if intStringLen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + intStringLen
+			if postIndex < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Ref = string(dAtA[iNdEx:postIndex])
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGateway(dAtA[iNdEx:])
@@ -12261,6 +12405,40 @@ func (m *InitMessage) Unmarshal(dAtA []byte) error {
 					break
 				}
 			}
+		case 6:
+			if wireType != 2 {
+				return fmt.Errorf("proto: wrong wireType = %d for field Secretenv", wireType)
+			}
+			var msglen int
+			for shift := uint(0); ; shift += 7 {
+				if shift >= 64 {
+					return ErrIntOverflowGateway
+				}
+				if iNdEx >= l {
+					return io.ErrUnexpectedEOF
+				}
+				b := dAtA[iNdEx]
+				iNdEx++
+				msglen |= int(b&0x7F) << shift
+				if b < 0x80 {
+					break
+				}
+			}
+			if msglen < 0 {
+				return ErrInvalidLengthGateway
+			}
+			postIndex := iNdEx + msglen
+			if postIndex < 0 {
+				return ErrInvalidLengthGateway
+			}
+			if postIndex > l {
+				return io.ErrUnexpectedEOF
+			}
+			m.Secretenv = append(m.Secretenv, &pb.SecretEnv{})
+			if err := m.Secretenv[len(m.Secretenv)-1].Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
+				return err
+			}
+			iNdEx = postIndex
 		default:
 			iNdEx = preIndex
 			skippy, err := skipGateway(dAtA[iNdEx:])

vendor/github.com/moby/buildkit/frontend/gateway/pb/gateway.proto

@@ -11,6 +11,7 @@ import "github.com/tonistiigi/fsutil/types/stat.proto";
 import "github.com/moby/buildkit/sourcepolicy/pb/policy.proto";
 
 
+
 option (gogoproto.sizer_all) = true;
 option (gogoproto.marshaler_all) = true;
 option (gogoproto.unmarshaler_all) = true;
@@ -124,11 +125,13 @@ message ResolveImageConfigRequest {
 	int32 ResolverType = 5;
 	string SessionID = 6;
 	string StoreID = 7;
+	repeated moby.buildkit.v1.sourcepolicy.Policy SourcePolicies = 8;
 }
 
 message ResolveImageConfigResponse {
 	string Digest = 1 [(gogoproto.customtype) = "github.com/opencontainers/go-digest.Digest", (gogoproto.nullable) = false];
 	bytes Config = 2;
+	string Ref = 3;
 }
 
 message SolveRequest {
@@ -281,6 +284,7 @@ message InitMessage{
 	repeated uint32 Fds = 3;
 	bool Tty = 4;
 	pb.SecurityMode Security = 5;
+	repeated pb.SecretEnv secretenv = 6;
 }
 
 message ExitMessage {

vendor/github.com/moby/buildkit/session/filesync/filesync.go

@@ -4,8 +4,11 @@ import (
 	"context"
 	"fmt"
 	io "io"
+	"net/url"
 	"os"
+	"strconv"
 	"strings"
+	"unicode"
 
 	"github.com/moby/buildkit/session"
 	"github.com/pkg/errors"
@@ -82,6 +85,7 @@ func (sp *fsSyncProvider) handle(method string, stream grpc.ServerStream) (retEr
 	}
 
 	opts, _ := metadata.FromIncomingContext(stream.Context()) // if no metadata continue with empty object
+	opts = decodeOpts(opts)
 
 	dirName := ""
 	name, ok := opts[keyDirName]
@@ -209,6 +213,8 @@ func FSSync(ctx context.Context, c session.Caller, opt FSSendRequestOpt) error {
 
 	var stream grpc.ClientStream
 
+	opts = encodeOpts(opts)
+
 	ctx = metadata.NewOutgoingContext(ctx, opts)
 
 	switch pr.name {
@@ -337,3 +343,60 @@ func (e InvalidSessionError) Error() string {
 func (e InvalidSessionError) Unwrap() error {
 	return e.err
 }
+
+func encodeOpts(opts map[string][]string) map[string][]string {
+	md := make(map[string][]string, len(opts))
+	for k, v := range opts {
+		out, encoded := encodeStringForHeader(v)
+		md[k] = out
+		if encoded {
+			md[k+"-encoded"] = []string{"1"}
+		}
+	}
+	return md
+}
+
+func decodeOpts(opts map[string][]string) map[string][]string {
+	md := make(map[string][]string, len(opts))
+	for k, v := range opts {
+		out := make([]string, len(v))
+		var isDecoded bool
+		if v, ok := opts[k+"-encoded"]; ok && len(v) > 0 {
+			if b, _ := strconv.ParseBool(v[0]); b {
+				isDecoded = true
+			}
+		}
+		if isDecoded {
+			for i, s := range v {
+				out[i], _ = url.QueryUnescape(s)
+			}
+		} else {
+			copy(out, v)
+		}
+		md[k] = out
+	}
+	return md
+}
+
+// encodeStringForHeader encodes a string value so it can be used in grpc header. This encoding
+// is backwards compatible and avoids encoding ASCII characters.
+func encodeStringForHeader(inputs []string) ([]string, bool) {
+	var encode bool
+	for _, input := range inputs {
+		for _, runeVal := range input {
+			// Only encode non-ASCII characters, and characters that have special
+			// meaning during decoding.
+			if runeVal > unicode.MaxASCII {
+				encode = true
+				break
+			}
+		}
+	}
+	if !encode {
+		return inputs, false
+	}
+	for i, input := range inputs {
+		inputs[i] = url.QueryEscape(input)
+	}
+	return inputs, true
+}

vendor/github.com/moby/buildkit/source/types/types.go

@@ -0,0 +1,10 @@
+package srctypes
+
+const (
+	DockerImageScheme = "docker-image"
+	GitScheme         = "git"
+	LocalScheme       = "local"
+	HTTPScheme        = "http"
+	HTTPSScheme       = "https"
+	OCIScheme         = "oci-layout"
+)

vendor/github.com/moby/buildkit/sourcepolicy/engine.go

@@ -0,0 +1,161 @@
+package sourcepolicy
+
+import (
+	"context"
+
+	"github.com/moby/buildkit/solver/pb"
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
+	"github.com/moby/buildkit/util/bklog"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
+)
+
+var (
+	// ErrSourceDenied is returned by the policy engine when a source is denied by the policy.
+	ErrSourceDenied = errors.New("source denied by policy")
+
+	// ErrTooManyOps is returned by the policy engine when there are too many converts for a single source op.
+	ErrTooManyOps = errors.New("too many operations")
+)
+
+// Engine is the source policy engine.
+// It is responsible for evaluating a source policy against a source operation.
+// Create one with `NewEngine`
+//
+// Rule matching is delegated to the `Matcher` interface.
+// Mutations are delegated to the `Mutater` interface.
+type Engine struct {
+	pol     []*spb.Policy
+	sources map[string]*selectorCache
+}
+
+// NewEngine creates a new source policy engine.
+func NewEngine(pol []*spb.Policy) *Engine {
+	return &Engine{
+		pol: pol,
+	}
+}
+
+// TODO: The key here can't be used to cache attr constraint regexes.
+func (e *Engine) selectorCache(src *spb.Selector) *selectorCache {
+	if e.sources == nil {
+		e.sources = map[string]*selectorCache{}
+	}
+
+	key := src.MatchType.String() + " " + src.Identifier
+
+	if s, ok := e.sources[key]; ok {
+		return s
+	}
+
+	s := &selectorCache{Selector: src}
+
+	e.sources[key] = s
+	return s
+}
+
+// Evaluate evaluates a source operation against the policy.
+//
+// Policies are re-evaluated for each convert rule.
+// Evaluate will error if the there are too many converts for a single source op to prevent infinite loops.
+// This function may error out even if the op was mutated, in which case `true` will be returned along with the error.
+//
+// An error is returned when the source is denied by the policy.
+func (e *Engine) Evaluate(ctx context.Context, op *pb.Op) (bool, error) {
+	if len(e.pol) == 0 {
+		return false, nil
+	}
+
+	var mutated bool
+	const maxIterr = 20
+
+	for i := 0; ; i++ {
+		if i > maxIterr {
+			return mutated, errors.Wrapf(ErrTooManyOps, "too many mutations on a single source")
+		}
+
+		srcOp := op.GetSource()
+		if srcOp == nil {
+			return false, nil
+		}
+		if i == 0 {
+			ctx = bklog.WithLogger(ctx, bklog.G(ctx).WithField("orig", *srcOp).WithField("updated", op.GetSource()))
+		}
+
+		mut, err := e.evaluatePolicies(ctx, srcOp)
+		if mut {
+			mutated = true
+		}
+		if err != nil {
+			return mutated, err
+		}
+		if !mut {
+			break
+		}
+	}
+
+	return mutated, nil
+}
+
+func (e *Engine) evaluatePolicies(ctx context.Context, srcOp *pb.SourceOp) (bool, error) {
+	for _, pol := range e.pol {
+		mut, err := e.evaluatePolicy(ctx, pol, srcOp)
+		if mut || err != nil {
+			return mut, err
+		}
+	}
+	return false, nil
+}
+
+// evaluatePolicy evaluates a single policy against a source operation.
+// If the source is mutated the policy is short-circuited and `true` is returned.
+// If the source is denied, an error will be returned.
+//
+// For Allow/Deny rules, the last matching rule wins.
+// E.g. `ALLOW foo; DENY foo` will deny `foo`, `DENY foo; ALLOW foo` will allow `foo`.
+func (e *Engine) evaluatePolicy(ctx context.Context, pol *spb.Policy, srcOp *pb.SourceOp) (retMut bool, retErr error) {
+	ident := srcOp.GetIdentifier()
+
+	ctx = bklog.WithLogger(ctx, bklog.G(ctx).WithField("ref", ident))
+	defer func() {
+		if retMut || retErr != nil {
+			bklog.G(ctx).WithFields(
+				logrus.Fields{
+					"mutated":       retMut,
+					"updated":       srcOp.GetIdentifier(),
+					logrus.ErrorKey: retErr,
+				}).Debug("Evaluated source policy")
+		}
+	}()
+
+	var deny bool
+	for _, rule := range pol.Rules {
+		selector := e.selectorCache(rule.Selector)
+		matched, err := match(ctx, selector, ident, srcOp.Attrs)
+		if err != nil {
+			return false, errors.Wrap(err, "error matching source policy")
+		}
+		if !matched {
+			continue
+		}
+
+		switch rule.Action {
+		case spb.PolicyAction_ALLOW:
+			deny = false
+		case spb.PolicyAction_DENY:
+			deny = true
+		case spb.PolicyAction_CONVERT:
+			mut, err := mutate(ctx, srcOp, rule, selector, ident)
+			if err != nil || mut {
+				return mut, errors.Wrap(err, "error mutating source policy")
+			}
+		default:
+			return false, errors.Errorf("source policy: rule %s %s: unknown type %q", rule.Action, rule.Selector.Identifier, ident)
+		}
+	}
+
+	if deny {
+		return false, errors.Wrapf(ErrSourceDenied, "source %q denied by policy", ident)
+	}
+	return false, nil
+}

vendor/github.com/moby/buildkit/sourcepolicy/formatter.go

@@ -0,0 +1,92 @@
+package sourcepolicy
+
+import (
+	"regexp"
+
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
+	"github.com/moby/buildkit/util/wildcard"
+	"github.com/pkg/errors"
+)
+
+// Source wraps a a protobuf source in order to store cached state such as the compiled regexes.
+type selectorCache struct {
+	*spb.Selector
+
+	re *regexp.Regexp
+	w  *wildcardCache
+}
+
+// Format formats the provided ref according to the match/type of the source.
+//
+// For example, if the source is a wildcard, the ref will be formatted with the wildcard in the source replacing the parameters in the destination.
+//
+//	matcher: wildcard source: "docker.io/library/golang:*"  match: "docker.io/library/golang:1.19" format: "docker.io/library/golang:${1}-alpine" result: "docker.io/library/golang:1.19-alpine"
+func (s *selectorCache) Format(match, format string) (string, error) {
+	switch s.MatchType {
+	case spb.MatchType_EXACT:
+		return s.Identifier, nil
+	case spb.MatchType_REGEX:
+		re, err := s.regex()
+		if err != nil {
+			return "", err
+		}
+		return re.ReplaceAllString(match, format), nil
+	case spb.MatchType_WILDCARD:
+		w, err := s.wildcard()
+		if err != nil {
+			return "", err
+		}
+		m := w.Match(match)
+		if m == nil {
+			return match, nil
+		}
+
+		return m.Format(format)
+	}
+	return "", errors.Errorf("unknown match type: %s", s.MatchType)
+}
+
+// wildcardCache wraps a wildcard.Wildcard to cache returned matches by ref.
+// This way a match only needs to be computed once per ref.
+type wildcardCache struct {
+	w *wildcard.Wildcard
+	m map[string]*wildcard.Match
+}
+
+func (w *wildcardCache) Match(ref string) *wildcard.Match {
+	if w.m == nil {
+		w.m = make(map[string]*wildcard.Match)
+	}
+
+	if m, ok := w.m[ref]; ok {
+		return m
+	}
+
+	m := w.w.Match(ref)
+	w.m[ref] = m
+	return m
+}
+
+func (s *selectorCache) wildcard() (*wildcardCache, error) {
+	if s.w != nil {
+		return s.w, nil
+	}
+	w, err := wildcard.New(s.Identifier)
+	if err != nil {
+		return nil, err
+	}
+	s.w = &wildcardCache{w: w}
+	return s.w, nil
+}
+
+func (s *selectorCache) regex() (*regexp.Regexp, error) {
+	if s.re != nil {
+		return s.re, nil
+	}
+	re, err := regexp.Compile(s.Identifier)
+	if err != nil {
+		return nil, err
+	}
+	s.re = re
+	return re, nil
+}

vendor/github.com/moby/buildkit/sourcepolicy/matcher.go

@@ -0,0 +1,58 @@
+package sourcepolicy
+
+import (
+	"context"
+	"regexp"
+
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
+	"github.com/pkg/errors"
+)
+
+func match(ctx context.Context, src *selectorCache, ref string, attrs map[string]string) (bool, error) {
+	for _, c := range src.Constraints {
+		switch c.Condition {
+		case spb.AttrMatch_EQUAL:
+			if attrs[c.Key] != c.Value {
+				return false, nil
+			}
+		case spb.AttrMatch_NOTEQUAL:
+			if attrs[c.Key] == c.Value {
+				return false, nil
+			}
+		case spb.AttrMatch_MATCHES:
+			// TODO: Cache the compiled regex
+			matches, err := regexp.MatchString(c.Value, attrs[c.Key])
+			if err != nil {
+				return false, errors.Errorf("invalid regex %q: %v", c.Value, err)
+			}
+			if !matches {
+				return false, nil
+			}
+		default:
+			return false, errors.Errorf("unknown attr condition: %s", c.Condition)
+		}
+	}
+
+	if src.Identifier == ref {
+		return true, nil
+	}
+
+	switch src.MatchType {
+	case spb.MatchType_EXACT:
+		return false, nil
+	case spb.MatchType_REGEX:
+		re, err := src.regex()
+		if err != nil {
+			return false, err
+		}
+		return re.MatchString(ref), nil
+	case spb.MatchType_WILDCARD:
+		w, err := src.wildcard()
+		if err != nil {
+			return false, err
+		}
+		return w.Match(ref) != nil, nil
+	default:
+		return false, errors.Errorf("unknown match type: %s", src.MatchType)
+	}
+}

vendor/github.com/moby/buildkit/sourcepolicy/mutate.go

@@ -0,0 +1,50 @@
+package sourcepolicy
+
+import (
+	"context"
+
+	"github.com/moby/buildkit/solver/pb"
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
+	"github.com/moby/buildkit/util/bklog"
+	"github.com/pkg/errors"
+)
+
+// mutate is a MutateFn which converts the source operation to the identifier and attributes provided by the policy.
+// If there is no change, then the return value should be false and is not considered an error.
+func mutate(ctx context.Context, op *pb.SourceOp, rule *spb.Rule, selector *selectorCache, ref string) (bool, error) {
+	if rule.Updates == nil {
+		return false, errors.Errorf("missing destination for convert rule")
+	}
+
+	dest := rule.Updates.Identifier
+	if dest == "" {
+		dest = rule.Selector.Identifier
+	}
+	dest, err := selector.Format(ref, dest)
+	if err != nil {
+		return false, errors.Wrap(err, "error formatting destination")
+	}
+
+	bklog.G(ctx).Debugf("sourcepolicy: converting %s to %s, pattern: %s", ref, dest, rule.Updates.Identifier)
+
+	var mutated bool
+	if op.Identifier != dest && dest != "" {
+		mutated = true
+		op.Identifier = dest
+	}
+
+	if rule.Updates.Attrs != nil {
+		if op.Attrs == nil {
+			op.Attrs = make(map[string]string, len(rule.Updates.Attrs))
+		}
+		for k, v := range rule.Updates.Attrs {
+			if op.Attrs[k] != v {
+				bklog.G(ctx).Debugf("setting attr %s=%s", k, v)
+				op.Attrs[k] = v
+				mutated = true
+			}
+		}
+	}
+
+	return mutated, nil
+}

vendor/github.com/moby/buildkit/util/contentutil/refs.go

@@ -20,7 +20,6 @@ func ProviderFromRef(ref string) (ocispecs.Descriptor, content.Provider, error)
 	headers := http.Header{}
 	headers.Set("User-Agent", version.UserAgent())
 	remote := docker.NewResolver(docker.ResolverOptions{
-		Client:  http.DefaultClient,
 		Headers: headers,
 	})
 
@@ -40,7 +39,6 @@ func IngesterFromRef(ref string) (content.Ingester, error) {
 	headers := http.Header{}
 	headers.Set("User-Agent", version.UserAgent())
 	remote := docker.NewResolver(docker.ResolverOptions{
-		Client:  http.DefaultClient,
 		Headers: headers,
 	})
 

vendor/github.com/moby/buildkit/util/flightcontrol/flightcontrol.go

@@ -25,13 +25,13 @@ type contextKeyT string
 var contextKey = contextKeyT("buildkit/util/flightcontrol.progress")
 
 // Group is a flightcontrol synchronization group
-type Group struct {
+type Group[T any] struct {
 	mu sync.Mutex          // protects m
-	m  map[string]*call // lazily initialized
+	m  map[string]*call[T] // lazily initialized
 }
 
 // Do executes a context function syncronized by the key
-func (g *Group) Do(ctx context.Context, key string, fn func(ctx context.Context) (interface{}, error)) (v interface{}, err error) {
+func (g *Group[T]) Do(ctx context.Context, key string, fn func(ctx context.Context) (T, error)) (v T, err error) {
 	var backoff time.Duration
 	for {
 		v, err = g.do(ctx, key, fn)
@@ -53,10 +53,10 @@ func (g *Group) Do(ctx context.Context, key string, fn func(ctx context.Context)
 	}
 }
 
-func (g *Group) do(ctx context.Context, key string, fn func(ctx context.Context) (interface{}, error)) (interface{}, error) {
+func (g *Group[T]) do(ctx context.Context, key string, fn func(ctx context.Context) (T, error)) (T, error) {
 	g.mu.Lock()
 	if g.m == nil {
-		g.m = make(map[string]*call)
+		g.m = make(map[string]*call[T])
 	}
 
 	if c, ok := g.m[key]; ok { // register 2nd waiter
@@ -78,16 +78,16 @@ func (g *Group) do(ctx context.Context, key string, fn func(ctx context.Context)
 	return c.wait(ctx)
 }
 
-type call struct {
+type call[T any] struct {
 	mu      sync.Mutex
-	result  interface{}
+	result  T
 	err     error
 	ready   chan struct{}
 	cleaned chan struct{}
 
-	ctx  *sharedContext
+	ctx  *sharedContext[T]
 	ctxs []context.Context
-	fn   func(ctx context.Context) (interface{}, error)
+	fn   func(ctx context.Context) (T, error)
 	once sync.Once
 
 	closeProgressWriter func()
@@ -95,8 +95,8 @@ type call struct {
 	progressCtx         context.Context
 }
 
-func newCall(fn func(ctx context.Context) (interface{}, error)) *call {
+func newCall[T any](fn func(ctx context.Context) (T, error)) *call[T] {
-	c := &call{
+	c := &call[T]{
 		fn:            fn,
 		ready:         make(chan struct{}),
 		cleaned:       make(chan struct{}),
@@ -114,7 +114,7 @@ func newCall(fn func(ctx context.Context) (interface{}, error)) *call {
 	return c
 }
 
-func (c *call) run() {
+func (c *call[T]) run() {
 	defer c.closeProgressWriter()
 	ctx, cancel := context.WithCancel(c.ctx)
 	defer cancel()
@@ -126,7 +126,8 @@ func (c *call) run() {
 	close(c.ready)
 }
 
-func (c *call) wait(ctx context.Context) (v interface{}, err error) {
+func (c *call[T]) wait(ctx context.Context) (v T, err error) {
+	var empty T
 	c.mu.Lock()
 	// detect case where caller has just returned, let it clean up before
 	select {
@@ -134,7 +135,7 @@ func (c *call) wait(ctx context.Context) (v interface{}, err error) {
 		c.mu.Unlock()
 		if c.err != nil { // on error retry
 			<-c.cleaned
-			return nil, errRetry
+			return empty, errRetry
 		}
 		pw, ok, _ := progress.NewFromContext(ctx)
 		if ok {
@@ -145,7 +146,7 @@ func (c *call) wait(ctx context.Context) (v interface{}, err error) {
 	case <-c.ctx.done: // could return if no error
 		c.mu.Unlock()
 		<-c.cleaned
-		return nil, errRetry
+		return empty, errRetry
 	default:
 	}
 
@@ -174,13 +175,13 @@ func (c *call) wait(ctx context.Context) (v interface{}, err error) {
 		if ok {
 			c.progressState.close(pw)
 		}
-		return nil, ctx.Err()
+		return empty, ctx.Err()
 	case <-c.ready:
 		return c.result, c.err // shared not implemented yet
 	}
 }
 
-func (c *call) Deadline() (deadline time.Time, ok bool) {
+func (c *call[T]) Deadline() (deadline time.Time, ok bool) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 	for _, ctx := range c.ctxs {
@@ -196,11 +197,11 @@ func (c *call) Deadline() (deadline time.Time, ok bool) {
 	return time.Time{}, false
 }
 
-func (c *call) Done() <-chan struct{} {
+func (c *call[T]) Done() <-chan struct{} {
 	return c.ctx.done
 }
 
-func (c *call) Err() error {
+func (c *call[T]) Err() error {
 	select {
 	case <-c.ctx.Done():
 		return c.ctx.err
@@ -209,7 +210,7 @@ func (c *call) Err() error {
 	}
 }
 
-func (c *call) Value(key interface{}) interface{} {
+func (c *call[T]) Value(key interface{}) interface{} {
 	if key == contextKey {
 		return c.progressState
 	}
@@ -239,17 +240,17 @@ func (c *call) Value(key interface{}) interface{} {
 	return nil
 }
 
-type sharedContext struct {
+type sharedContext[T any] struct {
-	*call
+	*call[T]
 	done chan struct{}
 	err  error
 }
 
-func newContext(c *call) *sharedContext {
+func newContext[T any](c *call[T]) *sharedContext[T] {
-	return &sharedContext{call: c, done: make(chan struct{})}
+	return &sharedContext[T]{call: c, done: make(chan struct{})}
 }
 
-func (sc *sharedContext) checkDone() bool {
+func (sc *sharedContext[T]) checkDone() bool {
 	sc.mu.Lock()
 	select {
 	case <-sc.done:

vendor/github.com/moby/buildkit/util/imageutil/config.go

@@ -0,0 +1,285 @@
+package imageutil
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/containerd/containerd/content"
+	"github.com/containerd/containerd/images"
+	"github.com/containerd/containerd/leases"
+	"github.com/containerd/containerd/platforms"
+	"github.com/containerd/containerd/reference"
+	"github.com/containerd/containerd/remotes"
+	"github.com/containerd/containerd/remotes/docker"
+	intoto "github.com/in-toto/in-toto-golang/in_toto"
+	"github.com/moby/buildkit/solver/pb"
+	srctypes "github.com/moby/buildkit/source/types"
+	"github.com/moby/buildkit/sourcepolicy"
+	spb "github.com/moby/buildkit/sourcepolicy/pb"
+	"github.com/moby/buildkit/util/contentutil"
+	"github.com/moby/buildkit/util/leaseutil"
+	"github.com/moby/buildkit/util/resolver/limited"
+	"github.com/moby/buildkit/util/resolver/retryhandler"
+	digest "github.com/opencontainers/go-digest"
+	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+type ContentCache interface {
+	content.Ingester
+	content.Provider
+	content.Manager
+}
+
+var leasesMu sync.Mutex
+var leasesF []func(context.Context) error
+
+func CancelCacheLeases() {
+	leasesMu.Lock()
+	for _, f := range leasesF {
+		f(context.TODO())
+	}
+	leasesF = nil
+	leasesMu.Unlock()
+}
+
+func AddLease(f func(context.Context) error) {
+	leasesMu.Lock()
+	leasesF = append(leasesF, f)
+	leasesMu.Unlock()
+}
+
+// ResolveToNonImageError is returned by the resolver when the ref is mutated by policy to a non-image ref
+type ResolveToNonImageError struct {
+	Ref     string
+	Updated string
+}
+
+func (e ResolveToNonImageError) Error() string {
+	return fmt.Sprintf("ref mutated by policy to non-image: %s://%s -> %s", srctypes.DockerImageScheme, e.Ref, e.Updated)
+}
+
+func Config(ctx context.Context, str string, resolver remotes.Resolver, cache ContentCache, leaseManager leases.Manager, p *ocispecs.Platform, spls []*spb.Policy) (string, digest.Digest, []byte, error) {
+	// TODO: fix buildkit to take interface instead of struct
+	var platform platforms.MatchComparer
+	if p != nil {
+		platform = platforms.Only(*p)
+	} else {
+		platform = platforms.Default()
+	}
+	ref, err := reference.Parse(str)
+	if err != nil {
+		return "", "", nil, errors.WithStack(err)
+	}
+
+	op := &pb.Op{
+		Op: &pb.Op_Source{
+			Source: &pb.SourceOp{
+				Identifier: srctypes.DockerImageScheme + "://" + ref.String(),
+			},
+		},
+	}
+
+	mut, err := sourcepolicy.NewEngine(spls).Evaluate(ctx, op)
+	if err != nil {
+		return "", "", nil, errors.Wrap(err, "could not resolve image due to policy")
+	}
+
+	if mut {
+		var (
+			t  string
+			ok bool
+		)
+		t, newRef, ok := strings.Cut(op.GetSource().GetIdentifier(), "://")
+		if !ok {
+			return "", "", nil, errors.Errorf("could not parse ref: %s", op.GetSource().GetIdentifier())
+		}
+		if ok && t != srctypes.DockerImageScheme {
+			return "", "", nil, &ResolveToNonImageError{Ref: str, Updated: newRef}
+		}
+		ref, err = reference.Parse(newRef)
+		if err != nil {
+			return "", "", nil, errors.WithStack(err)
+		}
+	}
+
+	if leaseManager != nil {
+		ctx2, done, err := leaseutil.WithLease(ctx, leaseManager, leases.WithExpiration(5*time.Minute), leaseutil.MakeTemporary)
+		if err != nil {
+			return "", "", nil, errors.WithStack(err)
+		}
+		ctx = ctx2
+		defer func() {
+			// this lease is not deleted to allow other components to access manifest/config from cache. It will be deleted after 5 min deadline or on pruning inactive builder
+			AddLease(done)
+		}()
+	}
+
+	desc := ocispecs.Descriptor{
+		Digest: ref.Digest(),
+	}
+	if desc.Digest != "" {
+		ra, err := cache.ReaderAt(ctx, desc)
+		if err == nil {
+			info, err := cache.Info(ctx, desc.Digest)
+			if err == nil {
+				if ok, err := contentutil.HasSource(info, ref); err == nil && ok {
+					desc.Size = ra.Size()
+					mt, err := DetectManifestMediaType(ra)
+					if err == nil {
+						desc.MediaType = mt
+					}
+				}
+			}
+		}
+	}
+	// use resolver if desc is incomplete
+	if desc.MediaType == "" {
+		_, desc, err = resolver.Resolve(ctx, ref.String())
+		if err != nil {
+			return "", "", nil, err
+		}
+	}
+
+	fetcher, err := resolver.Fetcher(ctx, ref.String())
+	if err != nil {
+		return "", "", nil, err
+	}
+
+	if desc.MediaType == images.MediaTypeDockerSchema1Manifest {
+		dgst, dt, err := readSchema1Config(ctx, ref.String(), desc, fetcher, cache)
+		return ref.String(), dgst, dt, err
+	}
+
+	children := childrenConfigHandler(cache, platform)
+
+	dslHandler, err := docker.AppendDistributionSourceLabel(cache, ref.String())
+	if err != nil {
+		return "", "", nil, err
+	}
+
+	handlers := []images.Handler{
+		retryhandler.New(limited.FetchHandler(cache, fetcher, str), func(_ []byte) {}),
+		dslHandler,
+		children,
+	}
+	if err := images.Dispatch(ctx, images.Handlers(handlers...), nil, desc); err != nil {
+		return "", "", nil, err
+	}
+	config, err := images.Config(ctx, cache, desc, platform)
+	if err != nil {
+		return "", "", nil, err
+	}
+
+	dt, err := content.ReadBlob(ctx, cache, config)
+	if err != nil {
+		return "", "", nil, err
+	}
+
+	return ref.String(), desc.Digest, dt, nil
+}
+
+func childrenConfigHandler(provider content.Provider, platform platforms.MatchComparer) images.HandlerFunc {
+	return func(ctx context.Context, desc ocispecs.Descriptor) ([]ocispecs.Descriptor, error) {
+		var descs []ocispecs.Descriptor
+		switch desc.MediaType {
+		case images.MediaTypeDockerSchema2Manifest, ocispecs.MediaTypeImageManifest:
+			p, err := content.ReadBlob(ctx, provider, desc)
+			if err != nil {
+				return nil, err
+			}
+
+			// TODO(stevvooe): We just assume oci manifest, for now. There may be
+			// subtle differences from the docker version.
+			var manifest ocispecs.Manifest
+			if err := json.Unmarshal(p, &manifest); err != nil {
+				return nil, err
+			}
+
+			descs = append(descs, manifest.Config)
+		case images.MediaTypeDockerSchema2ManifestList, ocispecs.MediaTypeImageIndex:
+			p, err := content.ReadBlob(ctx, provider, desc)
+			if err != nil {
+				return nil, err
+			}
+
+			var index ocispecs.Index
+			if err := json.Unmarshal(p, &index); err != nil {
+				return nil, err
+			}
+
+			if platform != nil {
+				for _, d := range index.Manifests {
+					if d.Platform == nil || platform.Match(*d.Platform) {
+						descs = append(descs, d)
+					}
+				}
+			} else {
+				descs = append(descs, index.Manifests...)
+			}
+		case images.MediaTypeDockerSchema2Config, ocispecs.MediaTypeImageConfig, docker.LegacyConfigMediaType,
+			intoto.PayloadType:
+			// childless data types.
+			return nil, nil
+		default:
+			return nil, errors.Errorf("encountered unknown type %v; children may not be fetched", desc.MediaType)
+		}
+
+		return descs, nil
+	}
+}
+
+// specs.MediaTypeImageManifest, // TODO: detect schema1/manifest-list
+func DetectManifestMediaType(ra content.ReaderAt) (string, error) {
+	// TODO: schema1
+
+	dt := make([]byte, ra.Size())
+	if _, err := ra.ReadAt(dt, 0); err != nil {
+		return "", err
+	}
+
+	return DetectManifestBlobMediaType(dt)
+}
+
+func DetectManifestBlobMediaType(dt []byte) (string, error) {
+	var mfst struct {
+		MediaType *string         `json:"mediaType"`
+		Config    json.RawMessage `json:"config"`
+		Manifests json.RawMessage `json:"manifests"`
+		Layers    json.RawMessage `json:"layers"`
+	}
+
+	if err := json.Unmarshal(dt, &mfst); err != nil {
+		return "", err
+	}
+
+	mt := images.MediaTypeDockerSchema2ManifestList
+
+	if mfst.Config != nil || mfst.Layers != nil {
+		mt = images.MediaTypeDockerSchema2Manifest
+
+		if mfst.Manifests != nil {
+			return "", errors.Errorf("invalid ambiguous manifest and manifest list")
+		}
+	}
+
+	if mfst.MediaType != nil {
+		switch *mfst.MediaType {
+		case images.MediaTypeDockerSchema2ManifestList, ocispecs.MediaTypeImageIndex:
+			if mt != images.MediaTypeDockerSchema2ManifestList {
+				return "", errors.Errorf("mediaType in manifest does not match manifest contents")
+			}
+			mt = *mfst.MediaType
+		case images.MediaTypeDockerSchema2Manifest, ocispecs.MediaTypeImageManifest:
+			if mt != images.MediaTypeDockerSchema2Manifest {
+				return "", errors.Errorf("mediaType in manifest does not match manifest contents")
+			}
+			mt = *mfst.MediaType
+		}
+	}
+	return mt, nil
+}

vendor/github.com/moby/buildkit/util/imageutil/schema1.go

@@ -0,0 +1,88 @@
+package imageutil
+
+import (
+	"context"
+	"encoding/json"
+	"io"
+	"strings"
+	"time"
+
+	"github.com/containerd/containerd/remotes"
+	"github.com/moby/buildkit/exporter/containerimage/image"
+	digest "github.com/opencontainers/go-digest"
+	ocispecs "github.com/opencontainers/image-spec/specs-go/v1"
+	"github.com/pkg/errors"
+)
+
+func readSchema1Config(ctx context.Context, ref string, desc ocispecs.Descriptor, fetcher remotes.Fetcher, cache ContentCache) (digest.Digest, []byte, error) {
+	rc, err := fetcher.Fetch(ctx, desc)
+	if err != nil {
+		return "", nil, err
+	}
+	defer rc.Close()
+	dt, err := io.ReadAll(rc)
+	if err != nil {
+		return "", nil, errors.Wrap(err, "failed to fetch schema1 manifest")
+	}
+	dt, err = convertSchema1ConfigMeta(dt)
+	if err != nil {
+		return "", nil, err
+	}
+	return desc.Digest, dt, nil
+}
+
+func convertSchema1ConfigMeta(in []byte) ([]byte, error) {
+	type history struct {
+		V1Compatibility string `json:"v1Compatibility"`
+	}
+	var m struct {
+		History []history `json:"history"`
+	}
+	if err := json.Unmarshal(in, &m); err != nil {
+		return nil, errors.Wrap(err, "failed to unmarshal schema1 manifest")
+	}
+	if len(m.History) == 0 {
+		return nil, errors.Errorf("invalid schema1 manifest")
+	}
+
+	var img image.Image
+	if err := json.Unmarshal([]byte(m.History[0].V1Compatibility), &img); err != nil {
+		return nil, errors.Wrap(err, "failed to unmarshal image from schema 1 history")
+	}
+
+	img.RootFS = ocispecs.RootFS{
+		Type: "layers", // filled in by exporter
+	}
+	img.History = make([]ocispecs.History, len(m.History))
+
+	for i := range m.History {
+		var h v1History
+		if err := json.Unmarshal([]byte(m.History[i].V1Compatibility), &h); err != nil {
+			return nil, errors.Wrap(err, "failed to unmarshal history")
+		}
+		img.History[len(m.History)-i-1] = ocispecs.History{
+			Author:     h.Author,
+			Comment:    h.Comment,
+			Created:    &h.Created,
+			CreatedBy:  strings.Join(h.ContainerConfig.Cmd, " "),
+			EmptyLayer: (h.ThrowAway != nil && *h.ThrowAway) || (h.Size != nil && *h.Size == 0),
+		}
+	}
+
+	dt, err := json.MarshalIndent(img, "", "  ")
+	if err != nil {
+		return nil, errors.Wrap(err, "failed to marshal schema1 config")
+	}
+	return dt, nil
+}
+
+type v1History struct {
+	Author          string    `json:"author,omitempty"`
+	Created         time.Time `json:"created"`
+	Comment         string    `json:"comment,omitempty"`
+	ThrowAway       *bool     `json:"throwaway,omitempty"`
+	Size            *int      `json:"Size,omitempty"` // used before ThrowAway field
+	ContainerConfig struct {
+		Cmd []string `json:"Cmd,omitempty"`
+	} `json:"container_config,omitempty"`
+}

vendor/github.com/moby/buildkit/util/leaseutil/manager.go

@@ -0,0 +1,83 @@
+package leaseutil
+
+import (
+	"context"
+	"time"
+
+	"github.com/containerd/containerd/leases"
+	"github.com/containerd/containerd/namespaces"
+)
+
+func WithLease(ctx context.Context, ls leases.Manager, opts ...leases.Opt) (context.Context, func(context.Context) error, error) {
+	_, ok := leases.FromContext(ctx)
+	if ok {
+		return ctx, func(context.Context) error {
+			return nil
+		}, nil
+	}
+
+	l, err := ls.Create(ctx, append([]leases.Opt{leases.WithRandomID(), leases.WithExpiration(time.Hour)}, opts...)...)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	ctx = leases.WithLease(ctx, l.ID)
+	return ctx, func(ctx context.Context) error {
+		return ls.Delete(ctx, l)
+	}, nil
+}
+
+func MakeTemporary(l *leases.Lease) error {
+	if l.Labels == nil {
+		l.Labels = map[string]string{}
+	}
+	l.Labels["buildkit/lease.temporary"] = time.Now().UTC().Format(time.RFC3339Nano)
+	return nil
+}
+
+func WithNamespace(lm leases.Manager, ns string) *Manager {
+	return &Manager{manager: lm, ns: ns}
+}
+
+type Manager struct {
+	manager leases.Manager
+	ns      string
+}
+
+func (l *Manager) Namespace() string {
+	return l.ns
+}
+
+func (l *Manager) WithNamespace(ns string) *Manager {
+	return WithNamespace(l.manager, ns)
+}
+
+func (l *Manager) Create(ctx context.Context, opts ...leases.Opt) (leases.Lease, error) {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.Create(ctx, opts...)
+}
+
+func (l *Manager) Delete(ctx context.Context, lease leases.Lease, opts ...leases.DeleteOpt) error {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.Delete(ctx, lease, opts...)
+}
+
+func (l *Manager) List(ctx context.Context, filters ...string) ([]leases.Lease, error) {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.List(ctx, filters...)
+}
+
+func (l *Manager) AddResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.AddResource(ctx, lease, resource)
+}
+
+func (l *Manager) DeleteResource(ctx context.Context, lease leases.Lease, resource leases.Resource) error {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.DeleteResource(ctx, lease, resource)
+}
+
+func (l *Manager) ListResources(ctx context.Context, lease leases.Lease) ([]leases.Resource, error) {
+	ctx = namespaces.WithNamespace(ctx, l.ns)
+	return l.manager.ListResources(ctx, lease)
+}

vendor/github.com/moby/buildkit/util/system/path.go

@@ -37,8 +37,8 @@ func NormalizePath(parent, newPath, inputOS string, keepSlash bool) (string, err
 		inputOS = "linux"
 	}
 
-	newPath = toSlash(newPath, inputOS)
+	newPath = ToSlash(newPath, inputOS)
-	parent = toSlash(parent, inputOS)
+	parent = ToSlash(parent, inputOS)
 	origPath := newPath
 
 	if parent == "" {
@@ -82,18 +82,17 @@ func NormalizePath(parent, newPath, inputOS string, keepSlash bool) (string, err
 		}
 	}
 
-	return toSlash(newPath, inputOS), nil
+	return ToSlash(newPath, inputOS), nil
 }
 
-func toSlash(inputPath, inputOS string) string {
+func ToSlash(inputPath, inputOS string) string {
-	separator := "/"
+	if inputOS != "windows" {
-	if inputOS == "windows" {
+		return inputPath
-		separator = "\\"
 	}
-	return strings.Replace(inputPath, separator, "/", -1)
+	return strings.Replace(inputPath, "\\", "/", -1)
 }
 
-func fromSlash(inputPath, inputOS string) string {
+func FromSlash(inputPath, inputOS string) string {
 	separator := "/"
 	if inputOS == "windows" {
 		separator = "\\"
@@ -119,7 +118,7 @@ func NormalizeWorkdir(current, wd string, inputOS string) (string, error) {
 
 	// Make sure we use the platform specific path separator. HCS does not like forward
 	// slashes in CWD.
-	return fromSlash(wd, inputOS), nil
+	return FromSlash(wd, inputOS), nil
 }
 
 // IsAbs returns a boolean value indicating whether or not the path
@@ -142,7 +141,7 @@ func IsAbs(pth, inputOS string) bool {
 	if err != nil {
 		return false
 	}
-	cleanedPath = toSlash(cleanedPath, inputOS)
+	cleanedPath = ToSlash(cleanedPath, inputOS)
 	// We stripped any potential drive letter and converted any backslashes to
 	// forward slashes. We can safely use path.IsAbs() for both Windows and Linux.
 	return path.IsAbs(cleanedPath)
@@ -189,14 +188,14 @@ func CheckSystemDriveAndRemoveDriveLetter(path string, inputOS string) (string,
 	}
 
 	// UNC paths should error out
-	if len(path) >= 2 && toSlash(path[:2], inputOS) == "//" {
+	if len(path) >= 2 && ToSlash(path[:2], inputOS) == "//" {
 		return "", errors.Errorf("UNC paths are not supported")
 	}
 
 	parts := strings.SplitN(path, ":", 2)
 	// Path does not have a drive letter. Just return it.
 	if len(parts) < 2 {
-		return toSlash(filepath.Clean(path), inputOS), nil
+		return ToSlash(filepath.Clean(path), inputOS), nil
 	}
 
 	// We expect all paths to be in C:
@@ -221,5 +220,5 @@ func CheckSystemDriveAndRemoveDriveLetter(path string, inputOS string) (string,
 	//
 	// We must return the second element of the split path, as is, without attempting to convert
 	// it to an absolute path. We have no knowledge of the CWD; that is treated elsewhere.
-	return toSlash(filepath.Clean(parts[1]), inputOS), nil
+	return ToSlash(filepath.Clean(parts[1]), inputOS), nil
 }

vendor/github.com/moby/buildkit/util/testutil/integration/dockerd.go

@@ -137,6 +137,7 @@ func (c Moby) New(ctx context.Context, cfg *BackendConfig) (b Backend, cl func()
 	dockerdFlags := []string{
 		"--config-file", dockerdConfigFile,
 		"--userland-proxy=false",
+		"--tls=false",
 		"--debug",
 	}
 	if s := os.Getenv("BUILDKIT_INTEGRATION_DOCKERD_FLAGS"); s != "" {

vendor/github.com/moby/buildkit/util/wildcard/wildcard.go

@@ -0,0 +1,87 @@
+package wildcard
+
+import (
+	"regexp"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// New returns a wildcard object for a string that contains "*" symbols.
+func New(s string) (*Wildcard, error) {
+	reStr, err := Wildcard2Regexp(s)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to translate wildcard %q to regexp", s)
+	}
+	re, err := regexp.Compile(reStr)
+	if err != nil {
+		return nil, errors.Wrapf(err, "failed to compile regexp %q (translated from wildcard %q)", reStr, s)
+	}
+	w := &Wildcard{
+		orig: s,
+		re:   re,
+	}
+	return w, nil
+}
+
+// Wildcard2Regexp translates a wildcard string to a regexp string.
+func Wildcard2Regexp(wildcard string) (string, error) {
+	s := regexp.QuoteMeta(wildcard)
+	if strings.Contains(s, "\\*\\*") {
+		return "", errors.New("invalid wildcard: \"**\"")
+	}
+	s = strings.ReplaceAll(s, "\\*", "(.*)")
+	s = "^" + s + "$"
+	return s, nil
+}
+
+// Wildcard is a wildcard matcher object.
+type Wildcard struct {
+	orig string
+	re   *regexp.Regexp
+}
+
+// String implements fmt.Stringer.
+func (w *Wildcard) String() string {
+	return w.orig
+}
+
+// Match returns a non-nil Match on match.
+func (w *Wildcard) Match(q string) *Match {
+	submatches := w.re.FindStringSubmatch(q)
+	if len(submatches) == 0 {
+		return nil
+	}
+	m := &Match{
+		w:          w,
+		Submatches: submatches,
+		// FIXME: avoid executing regexp twice
+		idx: w.re.FindStringSubmatchIndex(q),
+	}
+	return m
+}
+
+// Match is a matched result.
+type Match struct {
+	w          *Wildcard
+	Submatches []string // 0: the entire query, 1: the first submatch, 2: the second submatch, ...
+	idx        []int
+}
+
+// String implements fmt.Stringer.
+func (m *Match) String() string {
+	if len(m.Submatches) == 0 {
+		return ""
+	}
+	return m.Submatches[0]
+}
+
+// Format formats submatch strings like "$1", "$2".
+func (m *Match) Format(f string) (string, error) {
+	if m.w == nil || len(m.Submatches) == 0 || len(m.idx) == 0 {
+		return "", errors.New("invalid state")
+	}
+	var b []byte
+	b = m.w.re.ExpandString(b, f, m.Submatches[0], m.idx)
+	return string(b), nil
+}

vendor/modules.txt

@@ -157,10 +157,13 @@ github.com/containerd/containerd/content/proxy
 github.com/containerd/containerd/defaults
 github.com/containerd/containerd/errdefs
 github.com/containerd/containerd/filters
+github.com/containerd/containerd/identifiers
 github.com/containerd/containerd/images
 github.com/containerd/containerd/images/archive
 github.com/containerd/containerd/labels
+github.com/containerd/containerd/leases
 github.com/containerd/containerd/log
+github.com/containerd/containerd/namespaces
 github.com/containerd/containerd/pkg/dialer
 github.com/containerd/containerd/pkg/randutil
 github.com/containerd/containerd/pkg/seed
@@ -188,6 +191,9 @@ github.com/containerd/continuity/fs/fstest
 github.com/containerd/continuity/pathdriver
 github.com/containerd/continuity/proto
 github.com/containerd/continuity/sysx
+# github.com/containerd/ttrpc v1.2.2
+## explicit; go 1.13
+github.com/containerd/ttrpc
 # github.com/containerd/typeurl/v2 v2.1.1
 ## explicit; go 1.13
 github.com/containerd/typeurl/v2
@@ -495,7 +501,7 @@ github.com/mitchellh/go-wordwrap
 # github.com/mitchellh/mapstructure v1.5.0
 ## explicit; go 1.14
 github.com/mitchellh/mapstructure
-# github.com/moby/buildkit v0.11.0-rc3.0.20230620112432-2d91ddcceedc
+# github.com/moby/buildkit v0.12.1-0.20230717122532-faa0cc7da353
 ## explicit; go 1.20
 github.com/moby/buildkit/api/services/control
 github.com/moby/buildkit/api/types
@@ -536,6 +542,8 @@ github.com/moby/buildkit/session/upload/uploadprovider
 github.com/moby/buildkit/solver/errdefs
 github.com/moby/buildkit/solver/pb
 github.com/moby/buildkit/solver/result
+github.com/moby/buildkit/source/types
+github.com/moby/buildkit/sourcepolicy
 github.com/moby/buildkit/sourcepolicy/pb
 github.com/moby/buildkit/util/apicaps
 github.com/moby/buildkit/util/apicaps/pb
@@ -547,6 +555,8 @@ github.com/moby/buildkit/util/entitlements
 github.com/moby/buildkit/util/flightcontrol
 github.com/moby/buildkit/util/gitutil
 github.com/moby/buildkit/util/grpcerrors
+github.com/moby/buildkit/util/imageutil
+github.com/moby/buildkit/util/leaseutil
 github.com/moby/buildkit/util/progress
 github.com/moby/buildkit/util/progress/progressui
 github.com/moby/buildkit/util/progress/progresswriter
@@ -564,6 +574,7 @@ github.com/moby/buildkit/util/tracing/detect
 github.com/moby/buildkit/util/tracing/detect/delegated
 github.com/moby/buildkit/util/tracing/env
 github.com/moby/buildkit/util/tracing/otlptracegrpc
+github.com/moby/buildkit/util/wildcard
 github.com/moby/buildkit/version
 # github.com/moby/locker v1.0.1
 ## explicit; go 1.13