4754d2aeee
Add manifest.json file which is used by Docker to import images. Signed-off-by: Derek McGowan <derek@mcgstyle.net>
114 lines
3.1 KiB
Go
114 lines
3.1 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/archive"
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"github.com/containerd/containerd/platforms"
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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 images",
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ArgsUsage: "[flags] <out> <image> ...",
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Description: `Export images to an OCI tar archive.
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Tar output is formatted as an OCI archive, a Docker manifest is provided for the platform.
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Use '--skip-manifest-json' to avoid including the Docker manifest.json file.
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Use '--platform' to define the output platform.
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When '--all-platforms' is given all images in a manifest list must be available.
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`,
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Flags: []cli.Flag{
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cli.BoolFlag{
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Name: "skip-manifest-json",
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Usage: "do not add Docker compatible manifest.json to archive",
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},
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cli.StringSliceFlag{
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Name: "platform",
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Usage: "Pull content from a specific platform",
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Value: &cli.StringSlice{},
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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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images = context.Args().Tail()
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exportOpts = []archive.ExportOpt{}
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)
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if out == "" || len(images) == 0 {
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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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if pss := context.StringSlice("platform"); len(pss) > 0 {
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var all []ocispec.Platform
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for _, ps := range pss {
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p, err := platforms.Parse(ps)
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if err != nil {
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return errors.Wrapf(err, "invalid platform %q", ps)
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}
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all = append(all, p)
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}
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exportOpts = append(exportOpts, archive.WithPlatform(platforms.Ordered(all...)))
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} else {
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exportOpts = append(exportOpts, archive.WithPlatform(platforms.Default()))
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}
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if context.Bool("all-platforms") {
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exportOpts = append(exportOpts, archive.WithAllPlatforms())
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}
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if context.Bool("skip-manifest-json") {
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exportOpts = append(exportOpts, archive.WithSkipDockerManifest())
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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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is := client.ImageService()
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for _, img := range images {
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exportOpts = append(exportOpts, archive.WithImage(is, img))
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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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defer w.Close()
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return client.Export(ctx, w, exportOpts...)
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},
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}
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