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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 (
"errors"
"fmt"
"net/http"
"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/remote/transport"
"golang.org/x/sync/errgroup"
)
// 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)
}
puller, err := remote.NewPuller(o.Remote...)
if err != nil {
return err
}
if tag, ok := dstRef.(name.Tag); ok {
if o.noclobber {
logs.Progress.Printf("Checking existing tag %v", tag)
head, err := puller.Head(o.ctx, tag)
var terr *transport.Error
if errors.As(err, &terr) {
if terr.StatusCode != http.StatusNotFound && terr.StatusCode != http.StatusForbidden {
return err
}
} else if err != nil {
return err
}
if head != nil {
return fmt.Errorf("refusing to clobber existing tag %s@%s", tag, head.Digest)
}
}
}
pusher, err := remote.NewPusher(o.Remote...)
if err != nil {
return err
}
logs.Progress.Printf("Copying from %v to %v", srcRef, dstRef)
desc, err := puller.Get(o.ctx, srcRef)
if err != nil {
return fmt.Errorf("fetching %q: %w", src, err)
}
if o.Platform == nil {
return pusher.Push(o.ctx, dstRef, desc)
}
// If platform is explicitly set, don't copy the whole index, just the appropriate image.
img, err := desc.Image()
if err != nil {
return err
}
return pusher.Push(o.ctx, dstRef, img)
}
// CopyRepository copies every tag from src to dst.
func CopyRepository(src, dst string, opt ...Option) error {
o := makeOptions(opt...)
srcRepo, err := name.NewRepository(src, o.Name...)
if err != nil {
return err
}
dstRepo, err := name.NewRepository(dst, o.Name...)
if err != nil {
return fmt.Errorf("parsing reference for %q: %w", dst, err)
}
puller, err := remote.NewPuller(o.Remote...)
if err != nil {
return err
}
ignoredTags := map[string]struct{}{}
if o.noclobber {
// TODO: It would be good to propagate noclobber down into remote so we can use Etags.
have, err := puller.List(o.ctx, dstRepo)
if err != nil {
var terr *transport.Error
if errors.As(err, &terr) {
// Some registries create repository on first push, so listing tags will fail.
// If we see 404 or 403, assume we failed because the repository hasn't been created yet.
if !(terr.StatusCode == http.StatusNotFound || terr.StatusCode == http.StatusForbidden) {
return err
}
} else {
return err
}
}
for _, tag := range have {
ignoredTags[tag] = struct{}{}
}
}
pusher, err := remote.NewPusher(o.Remote...)
if err != nil {
return err
}
lister, err := puller.Lister(o.ctx, srcRepo)
if err != nil {
return err
}
g, ctx := errgroup.WithContext(o.ctx)
g.SetLimit(o.jobs)
for lister.HasNext() {
tags, err := lister.Next(ctx)
if err != nil {
return err
}
for _, tag := range tags.Tags {
tag := tag
if o.noclobber {
if _, ok := ignoredTags[tag]; ok {
logs.Progress.Printf("Skipping %s due to no-clobber", tag)
continue
}
}
g.Go(func() error {
srcTag, err := name.ParseReference(src+":"+tag, o.Name...)
if err != nil {
return fmt.Errorf("failed to parse tag: %w", err)
}
dstTag, err := name.ParseReference(dst+":"+tag, o.Name...)
if err != nil {
return fmt.Errorf("failed to parse tag: %w", err)
}
logs.Progress.Printf("Fetching %s", srcTag)
desc, err := puller.Get(ctx, srcTag)
if err != nil {
return err
}
logs.Progress.Printf("Pushing %s", dstTag)
return pusher.Push(ctx, dstTag, desc)
})
}
}
return g.Wait()
}
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