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/sirupsen/logrus" "github.com/spf13/cobra" ) 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 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", "/dev/stdout", "Write to a file, default is STDOUT") 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(&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'") } 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 := parse.ValidateFileName(output); err != nil { return err } return runtime.SaveImage(getContext(), c) }