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layers.go
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layers.go
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package main
import (
"errors"
"fmt"
"io"
"os"
"strings"
"github.com/containers/common/pkg/retry"
"github.com/containers/image/v5/directory"
"github.com/containers/image/v5/image"
"github.com/containers/image/v5/pkg/blobinfocache"
"github.com/containers/image/v5/types"
"github.com/opencontainers/go-digest"
"github.com/spf13/cobra"
)
type layersOptions struct {
global *globalOptions
image *imageOptions
retryOpts *retry.Options
}
func layersCmd(global *globalOptions) *cobra.Command {
sharedFlags, sharedOpts := sharedImageFlags()
imageFlags, imageOpts := imageFlags(global, sharedOpts, nil, "", "")
retryFlags, retryOpts := retryFlags()
opts := layersOptions{
global: global,
image: imageOpts,
retryOpts: retryOpts,
}
cmd := &cobra.Command{
Hidden: true,
Use: "layers [command options] IMAGE-NAME [LAYER...]",
Short: "Get layers of IMAGE-NAME",
RunE: commandAction(opts.run),
}
adjustUsage(cmd)
flags := cmd.Flags()
flags.AddFlagSet(&sharedFlags)
flags.AddFlagSet(&imageFlags)
flags.AddFlagSet(&retryFlags)
return cmd
}
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)
var (
rawSource types.ImageSource
src types.ImageCloser
)
if err = retry.IfNecessary(ctx, func() error {
rawSource, err = parseImageSource(ctx, opts.image, imageName)
return err
}, opts.retryOpts); err != nil {
return err
}
if err = retry.IfNecessary(ctx, func() error {
src, err = image.FromSource(ctx, sys, rawSource)
return err
}, opts.retryOpts); err != nil {
if closeErr := rawSource.Close(); closeErr != nil {
return fmt.Errorf("%w (closing image source: %v)", err, closeErr)
}
return err
}
defer func() {
if err := src.Close(); err != nil {
retErr = noteCloseFailure(retErr, "closing image", 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 := os.MkdirTemp(".", "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 = noteCloseFailure(retErr, "closing destination", err)
}
}()
for _, bd := range blobDigests {
var (
r io.ReadCloser
blobSize int64
)
if err = retry.IfNecessary(ctx, func() error {
r, blobSize, err = rawSource.GetBlob(ctx, types.BlobInfo{Digest: bd.digest, Size: -1}, cache)
return err
}, opts.retryOpts); 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 fmt.Errorf("%w (close error: %v)", err, closeErr)
}
return err
}
}
var manifest []byte
if err = retry.IfNecessary(ctx, func() error {
manifest, _, err = src.Manifest(ctx)
return err
}, opts.retryOpts); err != nil {
return err
}
if err := dest.PutManifest(ctx, manifest, nil); err != nil {
return err
}
return dest.Commit(ctx, image.UnparsedInstance(rawSource, nil))
}