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45 lines
1 KiB
Go
45 lines
1 KiB
Go
package client
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import (
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"errors"
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"io"
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"os"
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Cli "github.com/docker/docker/cli"
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flag "github.com/docker/docker/pkg/mflag"
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)
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// CmdExport exports a filesystem as a tar archive.
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//
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// The tar archive is streamed to STDOUT by default or written to a file.
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//
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// Usage: docker export [OPTIONS] CONTAINER
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func (cli *DockerCli) CmdExport(args ...string) error {
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cmd := Cli.Subcmd("export", []string{"CONTAINER"}, Cli.DockerCommands["export"].Description, true)
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outfile := cmd.String([]string{"o", "-output"}, "", "Write to a file, instead of STDOUT")
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cmd.Require(flag.Exact, 1)
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cmd.ParseFlags(args, true)
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var (
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output = cli.out
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err error
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)
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if *outfile != "" {
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output, err = os.Create(*outfile)
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if err != nil {
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return err
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}
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} else if cli.isTerminalOut {
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return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.")
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}
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responseBody, err := cli.client.ContainerExport(cmd.Arg(0))
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if err != nil {
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return err
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}
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defer responseBody.Close()
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_, err = io.Copy(output, responseBody)
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return err
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}
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