github.com/hustcat/docker@v1.3.3-0.20160314103604-901c67a8eeab/api/client/export.go (about)

     1  package client
     2  
     3  import (
     4  	"errors"
     5  	"io"
     6  
     7  	"golang.org/x/net/context"
     8  
     9  	Cli "github.com/docker/docker/cli"
    10  	flag "github.com/docker/docker/pkg/mflag"
    11  )
    12  
    13  // CmdExport exports a filesystem as a tar archive.
    14  //
    15  // The tar archive is streamed to STDOUT by default or written to a file.
    16  //
    17  // Usage: docker export [OPTIONS] CONTAINER
    18  func (cli *DockerCli) CmdExport(args ...string) error {
    19  	cmd := Cli.Subcmd("export", []string{"CONTAINER"}, Cli.DockerCommands["export"].Description, true)
    20  	outfile := cmd.String([]string{"o", "-output"}, "", "Write to a file, instead of STDOUT")
    21  	cmd.Require(flag.Exact, 1)
    22  
    23  	cmd.ParseFlags(args, true)
    24  
    25  	if *outfile == "" && cli.isTerminalOut {
    26  		return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.")
    27  	}
    28  
    29  	responseBody, err := cli.client.ContainerExport(context.Background(), cmd.Arg(0))
    30  	if err != nil {
    31  		return err
    32  	}
    33  	defer responseBody.Close()
    34  
    35  	if *outfile == "" {
    36  		_, err := io.Copy(cli.out, responseBody)
    37  		return err
    38  	}
    39  
    40  	return copyToFile(*outfile, responseBody)
    41  
    42  }