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// 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/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: %w", src, err)
}
dstRef, err := name.ParseReference(dst, o.Name...)
if err != nil {
return fmt.Errorf("parsing reference for %q: %w", 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: %w", 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: %w", err)
}
} else {
if err := copyIndex(desc, dstRef, o); err != nil {
return fmt.Errorf("failed to copy index: %w", err)
}
}
case types.DockerManifestSchema1, types.DockerManifestSchema1Signed:
// Handle schema 1 images separately.
if err := legacy.CopySchema1(desc, srcRef, dstRef, o.Remote...); err != nil {
return fmt.Errorf("failed to copy schema 1 image: %w", 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: %w", 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...)
}
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