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package main
import (
"os"
"strings"
"github.com/containers/libpod/cmd/podman/cliconfig"
"github.com/containers/libpod/cmd/podman/shared/parse"
"github.com/containers/libpod/pkg/adapter"
"github.com/containers/libpod/pkg/util"
"github.com/pkg/errors"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh/terminal"
)
const (
ociManifestDir = "oci-dir"
ociArchive = "oci-archive"
v2s2ManifestDir = "docker-dir"
v2s2Archive = "docker-archive"
)
var validFormats = []string{ociManifestDir, ociArchive, v2s2ManifestDir, v2s2Archive}
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 [flags] IMAGE",
Short: "Save image to an archive",
Long: saveDescription,
RunE: func(cmd *cobra.Command, args []string) error {
saveCommand.InputArgs = args
saveCommand.GlobalFlags = MainGlobalOpts
saveCommand.Remote = remoteclient
return saveCmd(&saveCommand)
},
Args: func(cmd *cobra.Command, args []string) error {
format, err := cmd.Flags().GetString("format")
if err != nil {
return err
}
if !util.StringInSlice(format, validFormats) {
return errors.Errorf("format value must be one of %s", strings.Join(validFormats, " "))
}
return nil
},
Example: `podman save --quiet -o myimage.tar imageID
podman save --format docker-dir -o ubuntu-dir ubuntu
podman save > alpine-all.tar alpine:latest`,
}
)
func init() {
saveCommand.Command = _saveCommand
saveCommand.SetHelpTemplate(HelpTemplate())
saveCommand.SetUsageTemplate(UsageTemplate())
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", v2s2Archive, "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-archive, docker-dir (directory with v2s2 manifest type)")
flags.StringVarP(&saveCommand.Output, "output", "o", "", "Write to a specified file (default: stdout, which must be redirected)")
flags.BoolVarP(&saveCommand.Quiet, "quiet", "q", false, "Suppress the output")
}
// 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 := adapter.GetRuntime(getContext(), &c.PodmanCommand)
if err != nil {
return errors.Wrapf(err, "could not create runtime")
}
defer runtime.DeferredShutdown(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'")
}
if len(c.Output) == 0 {
fi := os.Stdout
if terminal.IsTerminal(int(fi.Fd())) {
return errors.Errorf("refusing to save to terminal. Use -o flag or redirect")
}
c.Output = "/dev/stdout"
}
if err := parse.ValidateFileName(c.Output); err != nil {
return err
}
return runtime.SaveImage(getContext(), c)
}
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