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layers.go
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layers.go
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package main
import (
"fmt"
"io"
"io/ioutil"
"os"
"strings"
"github.com/containers/image/directory"
"github.com/containers/image/image"
"github.com/containers/image/pkg/blobinfocache"
"github.com/containers/image/types"
"github.com/opencontainers/go-digest"
"github.com/pkg/errors"
"github.com/urfave/cli"
)
type layersOptions struct {
global *globalOptions
image *imageOptions
}
func layersCmd(global *globalOptions) cli.Command {
sharedFlags, sharedOpts := sharedImageFlags()
imageFlags, imageOpts := imageFlags(global, sharedOpts, "", "")
opts := layersOptions{
global: global,
image: imageOpts,
}
return cli.Command{
Name: "layers",
Usage: "Get layers of IMAGE-NAME",
ArgsUsage: "IMAGE-NAME [LAYER...]",
Hidden: true,
Action: commandAction(opts.run),
Flags: append(sharedFlags, imageFlags...),
}
}
func (opts *layersOptions) run(args []string, stdout io.Writer) (retErr error) {
fmt.Fprintln(os.Stderr, `DEPRECATED: skopeo layers is deprecated in favor of skopeo copy`)
if len(args) == 0 {
return errors.New("Usage: layers imageReference [layer...]")
}
imageName := args[0]
if err := reexecIfNecessaryForImages(imageName); err != nil {
return err
}
ctx, cancel := opts.global.commandTimeoutContext()
defer cancel()
sys, err := opts.image.newSystemContext()
if err != nil {
return err
}
cache := blobinfocache.DefaultCache(sys)
rawSource, err := parseImageSource(ctx, opts.image, imageName)
if err != nil {
return err
}
src, err := image.FromSource(ctx, sys, rawSource)
if err != nil {
if closeErr := rawSource.Close(); closeErr != nil {
return errors.Wrapf(err, " (close error: %v)", closeErr)
}
return err
}
defer func() {
if err := src.Close(); err != nil {
retErr = errors.Wrapf(retErr, " (close error: %v)", err)
}
}()
type blobDigest struct {
digest digest.Digest
isConfig bool
}
var blobDigests []blobDigest
for _, dString := range args[1:] {
if !strings.HasPrefix(dString, "sha256:") {
dString = "sha256:" + dString
}
d, err := digest.Parse(dString)
if err != nil {
return err
}
blobDigests = append(blobDigests, blobDigest{digest: d, isConfig: false})
}
if len(blobDigests) == 0 {
layers := src.LayerInfos()
seenLayers := map[digest.Digest]struct{}{}
for _, info := range layers {
if _, ok := seenLayers[info.Digest]; !ok {
blobDigests = append(blobDigests, blobDigest{digest: info.Digest, isConfig: false})
seenLayers[info.Digest] = struct{}{}
}
}
configInfo := src.ConfigInfo()
if configInfo.Digest != "" {
blobDigests = append(blobDigests, blobDigest{digest: configInfo.Digest, isConfig: true})
}
}
tmpDir, err := ioutil.TempDir(".", "layers-")
if err != nil {
return err
}
tmpDirRef, err := directory.NewReference(tmpDir)
if err != nil {
return err
}
dest, err := tmpDirRef.NewImageDestination(ctx, nil)
if err != nil {
return err
}
defer func() {
if err := dest.Close(); err != nil {
retErr = errors.Wrapf(retErr, " (close error: %v)", err)
}
}()
for _, bd := range blobDigests {
r, blobSize, err := rawSource.GetBlob(ctx, types.BlobInfo{Digest: bd.digest, Size: -1}, cache)
if err != nil {
return err
}
if _, err := dest.PutBlob(ctx, r, types.BlobInfo{Digest: bd.digest, Size: blobSize}, cache, bd.isConfig); err != nil {
if closeErr := r.Close(); closeErr != nil {
return errors.Wrapf(err, " (close error: %v)", closeErr)
}
return err
}
}
manifest, _, err := src.Manifest(ctx)
if err != nil {
return err
}
if err := dest.PutManifest(ctx, manifest); err != nil {
return err
}
return dest.Commit(ctx)
}