hack: generate vtproto files for buildx

Integrates vtproto into buildx. The generated files dockerfile has been
modified to copy the buildkit equivalent file to ensure files are laid
out in the appropriate way for imports.

An import has also been included to change the grpc codec to the version
in buildkit that supports vtproto. This will allow buildx to utilize the
speed and memory improvements from that.

Also updates the gc control options for prune.

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/github.com/moby/buildkit/solver/pb/caps.go

@@ -67,6 +67,7 @@ const (
 	CapFileCopyIncludeExcludePatterns         apicaps.CapID = "file.copy.includeexcludepatterns"
 	CapFileRmNoFollowSymlink                  apicaps.CapID = "file.rm.nofollowsymlink"
 	CapFileCopyAlwaysReplaceExistingDestPaths apicaps.CapID = "file.copy.alwaysreplaceexistingdestpaths"
+	CapFileCopyModeStringFormat               apicaps.CapID = "file.copy.modestring"
 
 	CapConstraints apicaps.CapID = "constraints"
 	CapPlatform    apicaps.CapID = "platform"
@@ -91,6 +92,9 @@ const (
 	CapMultipleExporters apicaps.CapID = "exporter.multiple"
 
 	CapSourcePolicy apicaps.CapID = "source.policy"
+
+	// GC/Prune controls allow MinFreeSpace and MaxUsedSpace to be set
+	CapGCFreeSpaceFilter apicaps.CapID = "gc.freespacefilter"
 )
 
 func init() {
@@ -488,4 +492,10 @@ func init() {
 		Enabled: true,
 		Status:  apicaps.CapStatusExperimental,
 	})
+
+	Caps.Init(apicaps.Cap{
+		ID:      CapGCFreeSpaceFilter,
+		Enabled: true,
+		Status:  apicaps.CapStatusExperimental,
+	})
 }

vendor/github.com/moby/buildkit/solver/pb/generate.go

@@ -1,3 +0,0 @@
-package pb
-
-//go:generate protoc -I=. -I=../../vendor/ --go_out=paths=source_relative:. ops.proto

vendor/github.com/moby/buildkit/solver/pb/ops.go

@@ -1,23 +1,21 @@
 package pb
 
-import proto "google.golang.org/protobuf/proto"
-
 func (m *Definition) IsNil() bool {
 	return m == nil || m.Metadata == nil
 }
 
 func (m *Definition) Marshal() ([]byte, error) {
-	return proto.Marshal(m)
+	return m.MarshalVT()
 }
 
 func (m *Definition) Unmarshal(dAtA []byte) error {
-	return proto.Unmarshal(dAtA, m)
+	return m.UnmarshalVT(dAtA)
 }
 
 func (m *Op) Marshal() ([]byte, error) {
-	return proto.Marshal(m)
+	return m.MarshalVT()
 }
 
 func (m *Op) Unmarshal(dAtA []byte) error {
-	return proto.Unmarshal(dAtA, m)
+	return m.UnmarshalVT(dAtA)
 }

vendor/github.com/moby/buildkit/solver/pb/ops.proto

@@ -341,6 +341,8 @@ message FileActionCopy {
 	repeated string exclude_patterns = 13;
 	// alwaysReplaceExistingDestPaths results in an existing dest path that differs in type from the src path being replaced rather than the default of returning an error
 	bool alwaysReplaceExistingDestPaths = 14;
+	// mode in non-octal format
+	string modeStr = 15;
 }
 
 message FileActionMkFile {