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package main
import (
"fmt"
"io"
"os"
"strings"
"github.com/containers/image/directory"
dockerarchive "github.com/containers/image/docker/archive"
"github.com/containers/image/docker/reference"
"github.com/containers/image/manifest"
ociarchive "github.com/containers/image/oci/archive"
"github.com/containers/image/types"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/libpodruntime"
libpodImage "github.com/containers/libpod/libpod/image"
imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
)
const (
ociManifestDir = "oci-dir"
v2s2ManifestDir = "docker-dir"
)
var (
saveCommand cliconfig.SaveValues
saveDescription = `
Save an image to docker-archive or oci-archive on the local machine.
Default is docker-archive`
_saveCommand = &cobra.Command{
Use: "save",
Short: "Save image to an archive",
Long: saveDescription,
RunE: func(cmd *cobra.Command, args []string) error {
saveCommand.InputArgs = args
saveCommand.GlobalFlags = MainGlobalOpts
return saveCmd(&saveCommand)
},
Example: "",
}
)
func init() {
saveCommand.Command = _saveCommand
flags := saveCommand.Flags()
flags.BoolVar(&saveCommand.Compress, "compress", false, "Compress tarball image layers when saving to a directory using the 'dir' transport. (default is same compression type as source)")
flags.StringVar(&saveCommand.Format, "format", "", "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-dir (directory with v2s2 manifest type)")
flags.StringVarP(&saveCommand.Output, "output", "o", "/dev/stdout", "Write to a file, default is STDOUT")
flags.BoolVarP(&saveCommand.Quiet, "quiet", "q", false, "Suppress the output")
rootCmd.AddCommand(saveCommand.Command)
}
// saveCmd saves the image to either docker-archive or oci
func saveCmd(c *cliconfig.SaveValues) error {
args := c.InputArgs
if len(args) == 0 {
return errors.Errorf("need at least 1 argument")
}
runtime, err := libpodruntime.GetRuntime(&c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not create runtime")
}
defer runtime.Shutdown(false)
if c.Flag("compress").Changed && (c.Format != ociManifestDir && c.Format != v2s2ManifestDir && c.Format == "") {
return errors.Errorf("--compress can only be set when --format is either 'oci-dir' or 'docker-dir'")
}
var writer io.Writer
if !c.Quiet {
writer = os.Stderr
}
output := c.Output
if output == "/dev/stdout" {
fi := os.Stdout
if logrus.IsTerminal(fi) {
return errors.Errorf("refusing to save to terminal. Use -o flag or redirect")
}
}
if err := validateFileName(output); err != nil {
return err
}
source := args[0]
newImage, err := runtime.ImageRuntime().NewFromLocal(source)
if err != nil {
return err
}
var destRef types.ImageReference
var manifestType string
switch c.Format {
case "oci-archive":
destImageName := imageNameForSaveDestination(newImage, source)
destRef, err = ociarchive.NewReference(output, destImageName) // destImageName may be ""
if err != nil {
return errors.Wrapf(err, "error getting OCI archive ImageReference for (%q, %q)", output, destImageName)
}
case "oci-dir":
destRef, err = directory.NewReference(output)
if err != nil {
return errors.Wrapf(err, "error getting directory ImageReference for %q", output)
}
manifestType = imgspecv1.MediaTypeImageManifest
case "docker-dir":
destRef, err = directory.NewReference(output)
if err != nil {
return errors.Wrapf(err, "error getting directory ImageReference for %q", output)
}
manifestType = manifest.DockerV2Schema2MediaType
case "docker-archive", "":
dst := output
destImageName := imageNameForSaveDestination(newImage, source)
if destImageName != "" {
dst = fmt.Sprintf("%s:%s", dst, destImageName)
}
destRef, err = dockerarchive.ParseReference(dst) // FIXME? Add dockerarchive.NewReference
if err != nil {
return errors.Wrapf(err, "error getting Docker archive ImageReference for %q", dst)
}
default:
return errors.Errorf("unknown format option %q", c.String("format"))
}
// supports saving multiple tags to the same tar archive
var additionaltags []reference.NamedTagged
if len(args) > 1 {
additionaltags, err = libpodImage.GetAdditionalTags(args[1:])
if err != nil {
return err
}
}
if err := newImage.PushImageToReference(getContext(), destRef, manifestType, "", "", writer, c.Bool("compress"), libpodImage.SigningOptions{}, &libpodImage.DockerRegistryOptions{}, additionaltags); err != nil {
if err2 := os.Remove(output); err2 != nil {
logrus.Errorf("error deleting %q: %v", output, err)
}
return errors.Wrapf(err, "unable to save %q", args)
}
return nil
}
// imageNameForSaveDestination returns a Docker-like reference appropriate for saving img,
// which the user referred to as imgUserInput; or an empty string, if there is no appropriate
// reference.
func imageNameForSaveDestination(img *libpodImage.Image, imgUserInput string) string {
if strings.Contains(img.ID(), imgUserInput) {
return ""
}
prepend := ""
localRegistryPrefix := fmt.Sprintf("%s/", libpodImage.DefaultLocalRegistry)
if !strings.HasPrefix(imgUserInput, localRegistryPrefix) {
// we need to check if localhost was added to the image name in NewFromLocal
for _, name := range img.Names() {
// If the user is saving an image in the localhost registry, getLocalImage need
// a name that matches the format localhost/<tag1>:<tag2> or localhost/<tag>:latest to correctly
// set up the manifest and save.
if strings.HasPrefix(name, localRegistryPrefix) && (strings.HasSuffix(name, imgUserInput) || strings.HasSuffix(name, fmt.Sprintf("%s:latest", imgUserInput))) {
prepend = localRegistryPrefix
break
}
}
}
return fmt.Sprintf("%s%s", prepend, imgUserInput)
}
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