vendor: update buildkit with typed errors support

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

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

@@ -0,0 +1,98 @@
+package llb
+
+import (
+	"context"
+
+	"github.com/moby/buildkit/solver/pb"
+	"github.com/moby/buildkit/util/flightcontrol"
+	digest "github.com/opencontainers/go-digest"
+	"github.com/pkg/errors"
+)
+
+type asyncState struct {
+	f      func(context.Context, State) (State, error)
+	prev   State
+	target State
+	set    bool
+	err    error
+	g      flightcontrol.Group
+}
+
+func (as *asyncState) Output() Output {
+	return as
+}
+
+func (as *asyncState) Vertex(ctx context.Context) Vertex {
+	err := as.Do(ctx)
+	if err != nil {
+		return &errVertex{err}
+	}
+	if as.set {
+		out := as.target.Output()
+		if out == nil {
+			return nil
+		}
+		return out.Vertex(ctx)
+	}
+	return nil
+}
+
+func (as *asyncState) ToInput(ctx context.Context, c *Constraints) (*pb.Input, error) {
+	err := as.Do(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if as.set {
+		out := as.target.Output()
+		if out == nil {
+			return nil, nil
+		}
+		return out.ToInput(ctx, c)
+	}
+	return nil, nil
+}
+
+func (as *asyncState) Do(ctx context.Context) error {
+	_, err := as.g.Do(ctx, "", func(ctx context.Context) (interface{}, error) {
+		if as.set {
+			return as.target, as.err
+		}
+		res, err := as.f(ctx, as.prev)
+		if err != nil {
+			select {
+			case <-ctx.Done():
+				if errors.Is(err, ctx.Err()) {
+					return res, err
+				}
+			default:
+			}
+		}
+		as.target = res
+		as.err = err
+		as.set = true
+		return res, err
+	})
+	if err != nil {
+		return err
+	}
+	return as.err
+}
+
+type errVertex struct {
+	err error
+}
+
+func (v *errVertex) Validate(context.Context) error {
+	return v.err
+}
+func (v *errVertex) Marshal(context.Context, *Constraints) (digest.Digest, []byte, *pb.OpMetadata, []*SourceLocation, error) {
+	return "", nil, nil, nil, v.err
+}
+func (v *errVertex) Output() Output {
+	return nil
+}
+func (v *errVertex) Inputs() []Output {
+	return nil
+}
+
+var _ Vertex = &errVertex{}