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47 lines
1.4 KiB
47 lines
1.4 KiB
// Copyright 2018 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 crane
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import (
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"io"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/mutate"
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)
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// Export writes the filesystem contents (as a tarball) of img to w.
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// If img has a single layer, just write the (uncompressed) contents to w so
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// that this "just works" for images that just wrap a single blob.
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func Export(img v1.Image, w io.Writer) error {
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layers, err := img.Layers()
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if err != nil {
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return err
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}
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if len(layers) == 1 {
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// If it's a single layer, we don't have to flatten the filesystem.
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// An added perk of skipping mutate.Extract here is that this works
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// for non-tarball layers.
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l := layers[0]
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rc, err := l.Uncompressed()
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if err != nil {
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return err
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}
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_, err = io.Copy(w, rc)
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return err
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}
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fs := mutate.Extract(img)
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_, err = io.Copy(w, fs)
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return err
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}
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