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moby--moby/api/client/export.go

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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
}