package client import ( "errors" "io" "os" Cli "github.com/docker/docker/cli" 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"}, Cli.DockerCommands["export"].Description, 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 = 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.") } responseBody, err := cli.client.ContainerExport(cmd.Arg(0)) if err != nil { return err } defer responseBody.Close() _, err = io.Copy(output, responseBody) return err }