package client import ( "errors" "io" "os" flag "github.com/docker/docker/pkg/mflag" ) // 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", []string{"CONTAINER"}, "Export the contents of a container's filesystem as a tar archive", true) outfile := cmd.String([]string{"o", "-output"}, "", "Write to a file, instead of STDOUT") cmd.Require(flag.Exact, 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.") } image := cmd.Arg(0) sopts := &streamOpts{ rawTerminal: true, out: output, } if _, err := cli.stream("GET", "/containers/"+image+"/export", sopts); err != nil { return err } return nil }