45dec2439e
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Signed-off-by: Christian Dupuis <cd@atomist.com>
84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
/*
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* Copyright © 2022 Docker, Inc.
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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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*/
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package registry
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import (
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"context"
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"fmt"
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"github.com/docker/cli/cli/command"
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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/daemon"
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"github.com/google/go-containerregistry/pkg/v1/remote"
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"github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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// DigestForImage retrieves the layer digests from either a local or remote image
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func DigestForImage(dockerCli command.Cli, image string) ([]digest.Digest, error) {
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digests := make([]digest.Digest, 0)
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limg, _, err := dockerCli.Client().ImageInspectWithRaw(context.Background(), image)
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if err == nil {
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for _, l := range limg.RootFS.Layers {
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parsed, _ := digest.Parse(l)
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digests = append(digests, parsed)
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}
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return digests, nil
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}
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ref, err := name.ParseReference(image)
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if err != nil {
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return nil, errors.Wrapf(err, "failed to parse reference: %s", image)
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}
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// check local daemon first
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img, err := daemon.Image(ref, daemon.WithClient(dockerCli.Client()))
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if err != nil {
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// image doesn't exist in daemon; try remote
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index, _ := remote.Index(ref, remote.WithAuthFromKeychain(authn.DefaultKeychain))
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if index != nil {
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m, _ := index.IndexManifest()
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for _, manifest := range m.Manifests {
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ref, _ = name.ParseReference(fmt.Sprintf("%s@%s", ref.Context(), manifest.Digest))
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if manifest.Platform.OS == "linux" && manifest.Platform.Architecture == "amd64" {
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break
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}
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}
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}
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desc, err := remote.Get(ref, remote.WithAuthFromKeychain(authn.DefaultKeychain))
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if err != nil {
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return nil, errors.Wrapf(err, "failed to pull image: %s", image)
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} else if desc != nil {
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img, _ = desc.Image()
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}
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}
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if img != nil {
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layers, _ := img.Layers()
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for _, layer := range layers {
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d, _ := layer.DiffID()
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parsed, _ := digest.Parse(d.String())
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digests = append(digests, parsed)
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}
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}
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return digests, nil
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}
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