package client import ( "errors" "io" "net/url" "os" flag "github.com/docker/docker/pkg/mflag" "github.com/docker/docker/utils" ) // CmdExport exports a filesystem as a tar archive. // // The tar archive is streamed to STDOUT by default or written to a file. // // Usage: docker export [OPTIONS] CONTAINER func (cli *DockerCli) CmdExport(args ...string) error { cmd := cli.Subcmd("export", "CONTAINER", "Export a filesystem as a tar archive (streamed to STDOUT by default)", true) outfile := cmd.String([]string{"o", "-output"}, "", "Write to a file, instead of STDOUT") cmd.Require(flag.Exact, 1) utils.ParseFlags(cmd, 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", "/containers/"+image+"/export", 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", "/containers/get?"+v.Encode(), nil, output, nil); err != nil { return err } } return nil }