package client import ( "errors" "io" "net/url" "os" flag "github.com/docker/docker/pkg/mflag" ) // CmdSave saves one or more images to a tar archive. // // The tar archive is written to STDOUT by default, or written to a file. // // Usage: docker save [OPTIONS] IMAGE [IMAGE...] func (cli *DockerCli) CmdSave(args ...string) error { cmd := cli.Subcmd("save", "IMAGE [IMAGE...]", "Save an image(s) to a tar archive (streamed to STDOUT by default)", true) outfile := cmd.String([]string{"o", "-output"}, "", "Write to an file, instead of STDOUT") cmd.Require(flag.Min, 1) cmd.ParseFlags(args, true) var ( output io.Writer = cli.out err error ) if *outfile != "" { output, err = os.Create(*outfile) if err != nil { return err } } else if cli.isTerminalOut { return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.") } if len(cmd.Args()) == 1 { image := cmd.Arg(0) if err := cli.stream("GET", "/images/"+image+"/get", nil, output, nil); err != nil { return err } } else { v := url.Values{} for _, arg := range cmd.Args() { v.Add("names", arg) } if err := cli.stream("GET", "/images/get?"+v.Encode(), nil, output, nil); err != nil { return err } } return nil }