mirror of https://github.com/kubernetes/kops.git
99 lines
2.9 KiB
Go
99 lines
2.9 KiB
Go
/*
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Copyright 2021 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package assets
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import (
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"fmt"
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"github.com/google/go-containerregistry/pkg/authn"
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"github.com/google/go-containerregistry/pkg/name"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/google/go-containerregistry/pkg/v1/types"
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"k8s.io/klog/v2"
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)
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// CopyImage copies a docker image from a source registry, to a target registry,
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// typically used for highly secure clusters.
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type CopyImage struct {
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Name string
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SourceImage string
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TargetImage string
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}
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func (e *CopyImage) Run() error {
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source := e.SourceImage
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target := e.TargetImage
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sourceRef, err := name.ParseReference(source)
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if err != nil {
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return fmt.Errorf("parsing reference %q: %v", source, err)
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}
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targetRef, err := name.ParseReference(target)
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if err != nil {
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return fmt.Errorf("parsing reference for %q: %v", target, err)
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}
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options := []remote.Option{remote.WithAuthFromKeychain(authn.DefaultKeychain)}
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desc, err := remote.Get(sourceRef, options...)
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if err != nil {
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return fmt.Errorf("fetching %q: %v", source, err)
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}
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targetDesc, err := remote.Get(targetRef, options...)
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if err == nil && desc.Digest.String() == targetDesc.Digest.String() {
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klog.Infof("no need to copy image from %v to %v", sourceRef, targetRef)
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return nil
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}
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switch desc.MediaType {
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case types.OCIImageIndex, types.DockerManifestList:
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// Handle indexes separately.
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if err := copyIndex(desc, sourceRef, targetRef, options...); err != nil {
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return fmt.Errorf("failed to copy index: %v", err)
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}
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default:
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// Assume anything else is an image, since some registries don't set mediaTypes properly.
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if err := copyImage(desc, sourceRef, targetRef, options...); err != nil {
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return fmt.Errorf("failed to copy image: %v", err)
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}
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}
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return nil
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}
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func copyImage(desc *remote.Descriptor, sourceRef name.Reference, targetRef name.Reference, options ...remote.Option) error {
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klog.Infof("copying image from %v to %v", sourceRef, targetRef)
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img, err := desc.Image()
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if err != nil {
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return err
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}
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return remote.Write(targetRef, img, options...)
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}
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func copyIndex(desc *remote.Descriptor, sourceRef name.Reference, targetRef name.Reference, options ...remote.Option) error {
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klog.Infof("copying image index from %v to %v", sourceRef, targetRef)
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idx, err := desc.ImageIndex()
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if err != nil {
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return err
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}
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return remote.WriteIndex(targetRef, idx, options...)
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}
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