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57 lines
1.6 KiB
57 lines
1.6 KiB
// Copyright 2019 Google LLC All Rights Reserved.
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Package legacy provides methods for interacting with legacy image formats.
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package legacy
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import (
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"bytes"
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"encoding/json"
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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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)
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// CopySchema1 allows `[g]crane cp` to work with old images without adding
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// full support for schema 1 images to this package.
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func CopySchema1(desc *remote.Descriptor, srcRef, dstRef name.Reference, opts ...remote.Option) error {
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m := schema1{}
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if err := json.NewDecoder(bytes.NewReader(desc.Manifest)).Decode(&m); err != nil {
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return err
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}
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for _, layer := range m.FSLayers {
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src := srcRef.Context().Digest(layer.BlobSum)
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dst := dstRef.Context().Digest(layer.BlobSum)
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blob, err := remote.Layer(src, opts...)
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if err != nil {
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return err
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}
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if err := remote.WriteLayer(dst.Context(), blob, opts...); err != nil {
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return err
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}
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}
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return remote.Put(dstRef, desc, opts...)
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}
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type fslayer struct {
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BlobSum string `json:"blobSum"`
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}
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type schema1 struct {
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FSLayers []fslayer `json:"fsLayers"`
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}
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