Update vendor

vendor/github.com/google/go-containerregistry/pkg/crane/copy.go

@@ -0,0 +1,102 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// 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 crane
+
+import (
+	"fmt"
+
+	"github.com/google/go-containerregistry/pkg/authn"
+	"github.com/google/go-containerregistry/pkg/internal/legacy"
+	"github.com/google/go-containerregistry/pkg/logs"
+	"github.com/google/go-containerregistry/pkg/name"
+	"github.com/google/go-containerregistry/pkg/v1/remote"
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// Copy copies a remote image or index from src to dst.
+func Copy(src, dst string, opt ...Option) error {
+	o := makeOptions(opt...)
+	srcRef, err := name.ParseReference(src, o.name...)
+	if err != nil {
+		return fmt.Errorf("parsing reference %q: %v", src, err)
+	}
+
+	dstRef, err := name.ParseReference(dst, o.name...)
+	if err != nil {
+		return fmt.Errorf("parsing reference for %q: %v", dst, err)
+	}
+
+	logs.Progress.Printf("Copying from %v to %v", srcRef, dstRef)
+	desc, err := remote.Get(srcRef, o.remote...)
+	if err != nil {
+		return fmt.Errorf("fetching %q: %v", src, err)
+	}
+
+	switch desc.MediaType {
+	case types.OCIImageIndex, types.DockerManifestList:
+		// Handle indexes separately.
+		if o.platform != nil {
+			// If platform is explicitly set, don't copy the whole index, just the appropriate image.
+			if err := copyImage(desc, dstRef, o); err != nil {
+				return fmt.Errorf("failed to copy image: %v", err)
+			}
+		} else {
+			if err := copyIndex(desc, dstRef, o); err != nil {
+				return fmt.Errorf("failed to copy index: %v", err)
+			}
+		}
+	case types.DockerManifestSchema1, types.DockerManifestSchema1Signed:
+		// Handle schema 1 images separately.
+		if err := copySchema1(desc, srcRef, dstRef); err != nil {
+			return fmt.Errorf("failed to copy schema 1 image: %v", err)
+		}
+	default:
+		// Assume anything else is an image, since some registries don't set mediaTypes properly.
+		if err := copyImage(desc, dstRef, o); err != nil {
+			return fmt.Errorf("failed to copy image: %v", err)
+		}
+	}
+
+	return nil
+}
+
+func copyImage(desc *remote.Descriptor, dstRef name.Reference, o options) error {
+	img, err := desc.Image()
+	if err != nil {
+		return err
+	}
+	return remote.Write(dstRef, img, o.remote...)
+}
+
+func copyIndex(desc *remote.Descriptor, dstRef name.Reference, o options) error {
+	idx, err := desc.ImageIndex()
+	if err != nil {
+		return err
+	}
+	return remote.WriteIndex(dstRef, idx, o.remote...)
+}
+
+func copySchema1(desc *remote.Descriptor, srcRef, dstRef name.Reference) error {
+	srcAuth, err := authn.DefaultKeychain.Resolve(srcRef.Context().Registry)
+	if err != nil {
+		return err
+	}
+	dstAuth, err := authn.DefaultKeychain.Resolve(dstRef.Context().Registry)
+	if err != nil {
+		return err
+	}
+
+	return legacy.CopySchema1(desc, srcRef, dstRef, srcAuth, dstAuth)
+}