Bump moby/buildkit

Signed-off-by: ulyssessouza <ulyssessouza@gmail.com>

vendor/github.com/containerd/containerd/content/helpers.go

@@ -55,7 +55,14 @@ func ReadBlob(ctx context.Context, provider Provider, desc ocispec.Descriptor) (
 
 	p := make([]byte, ra.Size())
 
-	_, err = ra.ReadAt(p, 0)
+	n, err := ra.ReadAt(p, 0)
+	if err == io.EOF {
+		if int64(n) != ra.Size() {
+			err = io.ErrUnexpectedEOF
+		} else {
+			err = nil
+		}
+	}
 	return p, err
 }
 
@@ -162,6 +169,28 @@ func CopyReaderAt(cw Writer, ra ReaderAt, n int64) error {
 	return err
 }
 
+// CopyReader copies to a writer from a given reader, returning
+// the number of bytes copied.
+// Note: if the writer has a non-zero offset, the total number
+// of bytes read may be greater than those copied if the reader
+// is not an io.Seeker.
+// This copy does not commit the writer.
+func CopyReader(cw Writer, r io.Reader) (int64, error) {
+	ws, err := cw.Status()
+	if err != nil {
+		return 0, errors.Wrap(err, "failed to get status")
+	}
+
+	if ws.Offset > 0 {
+		r, err = seekReader(r, ws.Offset, 0)
+		if err != nil {
+			return 0, errors.Wrapf(err, "unable to resume write to %v", ws.Ref)
+		}
+	}
+
+	return copyWithBuffer(cw, r)
+}
+
 // seekReader attempts to seek the reader to the given offset, either by
 // resolving `io.Seeker`, by detecting `io.ReaderAt`, or discarding
 // up to the given offset.

vendor/github.com/containerd/containerd/content/local/store.go

@@ -35,7 +35,6 @@ import (
 	"github.com/containerd/containerd/log"
 	"github.com/sirupsen/logrus"
 
-	"github.com/containerd/continuity"
 	digest "github.com/opencontainers/go-digest"
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 	"github.com/pkg/errors"
@@ -661,6 +660,19 @@ func writeTimestampFile(p string, t time.Time) error {
 	if err != nil {
 		return err
 	}
-
-	return continuity.AtomicWriteFile(p, b, 0666)
+	return atomicWrite(p, b, 0666)
+}
+
+func atomicWrite(path string, data []byte, mode os.FileMode) error {
+	tmp := fmt.Sprintf("%s.tmp", path)
+	f, err := os.OpenFile(tmp, os.O_RDWR|os.O_CREATE|os.O_TRUNC|os.O_SYNC, mode)
+	if err != nil {
+		return errors.Wrap(err, "create tmp file")
+	}
+	_, err = f.Write(data)
+	f.Close()
+	if err != nil {
+		return errors.Wrap(err, "write atomic data")
+	}
+	return os.Rename(tmp, path)
 }