b518f11dba
Export as a tar (Note: "-" can be used for stdout):
$ ctr images export /tmp/oci-busybox.tar docker.io/library/busybox:latest
Import a tar (Note: "-" can be used for stdin):
$ ctr images import foo/new:latest /tmp/oci-busybox.tar
Note: media types are not converted at the moment: e.g.
application/vnd.docker.image.rootfs.diff.tar.gzip
-> application/vnd.oci.image.layer.v1.tar+gzip
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
107 lines
2.4 KiB
Go
107 lines
2.4 KiB
Go
package main
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import (
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"io"
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"os"
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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 imagesExportCommand = 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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`,
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Flags: []cli.Flag{
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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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},
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Action: func(clicontext *cli.Context) error {
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var (
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out = clicontext.Args().First()
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local = clicontext.Args().Get(1)
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desc ocispec.Descriptor
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)
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ctx, cancel := appContext(clicontext)
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defer cancel()
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client, err := newClient(clicontext)
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if err != nil {
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return err
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}
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if manifest := clicontext.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 = clicontext.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 := clicontext.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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r, err := client.Export(ctx, desc)
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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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