137 lines
3.5 KiB
Go
137 lines
3.5 KiB
Go
/*
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Copyright The containerd 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 images
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import (
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"io"
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"os"
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"github.com/containerd/containerd/cmd/ctr/commands"
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"github.com/containerd/containerd/images/oci"
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"github.com/containerd/containerd/reference"
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digest "github.com/opencontainers/go-digest"
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ocispec "github.com/opencontainers/image-spec/specs-go/v1"
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"github.com/pkg/errors"
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"github.com/urfave/cli"
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)
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var exportCommand = cli.Command{
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Name: "export",
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Usage: "export an image",
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ArgsUsage: "[flags] <out> <image>",
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Description: `Export an image to a tar stream.
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Currently, only OCI format is supported.
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`,
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Flags: []cli.Flag{
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// TODO(AkihiroSuda): make this map[string]string as in moby/moby#33355?
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cli.StringFlag{
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Name: "oci-ref-name",
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Value: "",
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Usage: "override org.opencontainers.image.ref.name annotation",
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},
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cli.StringFlag{
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Name: "manifest",
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Usage: "digest of manifest",
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},
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cli.StringFlag{
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Name: "manifest-type",
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Usage: "media type of manifest digest",
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Value: ocispec.MediaTypeImageManifest,
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},
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cli.BoolFlag{
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Name: "all-platforms",
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Usage: "exports content from all platforms",
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},
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},
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Action: func(context *cli.Context) error {
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var (
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out = context.Args().First()
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local = context.Args().Get(1)
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desc ocispec.Descriptor
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)
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if out == "" || local == "" {
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return errors.New("please provide both an output filename and an image reference to export")
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}
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client, ctx, cancel, err := commands.NewClient(context)
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if err != nil {
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return err
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}
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defer cancel()
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if manifest := context.String("manifest"); manifest != "" {
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desc.Digest, err = digest.Parse(manifest)
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if err != nil {
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return errors.Wrap(err, "invalid manifest digest")
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}
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desc.MediaType = context.String("manifest-type")
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} else {
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img, err := client.ImageService().Get(ctx, local)
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if err != nil {
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return errors.Wrap(err, "unable to resolve image to manifest")
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}
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desc = img.Target
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}
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if desc.Annotations == nil {
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desc.Annotations = make(map[string]string)
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}
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if s, ok := desc.Annotations[ocispec.AnnotationRefName]; !ok || s == "" {
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if ociRefName := determineOCIRefName(local); ociRefName != "" {
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desc.Annotations[ocispec.AnnotationRefName] = ociRefName
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}
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if ociRefName := context.String("oci-ref-name"); ociRefName != "" {
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desc.Annotations[ocispec.AnnotationRefName] = ociRefName
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}
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}
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var w io.WriteCloser
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if out == "-" {
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w = os.Stdout
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} else {
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w, err = os.Create(out)
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if err != nil {
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return nil
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}
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}
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var (
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exportOpts []oci.V1ExporterOpt
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)
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exportOpts = append(exportOpts, oci.WithAllPlatforms(context.Bool("all-platforms")))
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r, err := client.Export(ctx, desc, exportOpts...)
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if err != nil {
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return err
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}
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if _, err := io.Copy(w, r); err != nil {
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return err
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}
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if err := w.Close(); err != nil {
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return err
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}
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return r.Close()
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},
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}
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func determineOCIRefName(local string) string {
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refspec, err := reference.Parse(local)
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if err != nil {
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return ""
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}
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tag, _ := reference.SplitObject(refspec.Object)
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return tag
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}
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