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package main
import (
"io"
"os"
"strings"
"github.com/containers/image/manifest"
imgspecv1 "github.com/opencontainers/image-spec/specs-go/v1"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
const (
ociManifestDir = "oci-dir"
v2s2ManifestDir = "docker-dir"
)
var (
saveFlags = []cli.Flag{
cli.BoolFlag{
Name: "compress",
Usage: "compress tarball image layers when saving to a directory using the 'dir' transport. (default is same compression type as source)",
},
cli.StringFlag{
Name: "output, o",
Usage: "Write to a file, default is STDOUT",
Value: "/dev/stdout",
},
cli.BoolFlag{
Name: "quiet, q",
Usage: "Suppress the output",
},
cli.StringFlag{
Name: "format",
Usage: "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-dir (directory with v2s2 manifest type)",
},
}
saveDescription = `
Save an image to docker-archive or oci-archive on the local machine.
Default is docker-archive`
saveCommand = cli.Command{
Name: "save",
Usage: "Save image to an archive",
Description: saveDescription,
Flags: saveFlags,
Action: saveCmd,
ArgsUsage: "",
SkipArgReorder: true,
}
)
// saveCmd saves the image to either docker-archive or oci
func saveCmd(c *cli.Context) error {
args := c.Args()
if len(args) == 0 {
return errors.Errorf("need at least 1 argument")
}
if err := validateFlags(c, saveFlags); err != nil {
return err
}
runtime, err := getRuntime(c)
if err != nil {
return errors.Wrapf(err, "could not create runtime")
}
defer runtime.Shutdown(false)
if c.IsSet("compress") && (c.String("format") != ociManifestDir && c.String("format") != v2s2ManifestDir && c.String("format") == "") {
return errors.Errorf("--compress can only be set when --format is either 'oci-dir' or 'docker-dir'")
}
var writer io.Writer
if !c.Bool("quiet") {
writer = os.Stdout
}
output := c.String("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")
}
}
var dst, manifestType string
switch c.String("format") {
case libpod.OCIArchive:
dst = libpod.OCIArchive + ":" + output
case "oci-dir":
dst = libpod.DirTransport + ":" + output
manifestType = imgspecv1.MediaTypeImageManifest
case "docker-dir":
dst = libpod.DirTransport + ":" + output
manifestType = manifest.DockerV2Schema2MediaType
case libpod.DockerArchive:
fallthrough
case "":
dst = libpod.DockerArchive + ":" + output
default:
return errors.Errorf("unknown format option %q", c.String("format"))
}
saveOpts := libpod.CopyOptions{
SignaturePolicyPath: "",
Writer: writer,
ManifestMIMEType: manifestType,
ForceCompress: c.Bool("compress"),
}
// only one image is supported for now
// future pull requests will fix this
for _, image := range args {
dest := dst
// need dest to be in the format transport:path:reference for the following transports
if strings.Contains(dst, libpod.OCIArchive) || strings.Contains(dst, libpod.DockerArchive) {
dest = dst + ":" + image
}
if err := runtime.PushImage(image, dest, saveOpts); 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", image)
}
}
return nil
}
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