60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package container
|
|
|
|
import (
|
|
"errors"
|
|
"io"
|
|
|
|
"golang.org/x/net/context"
|
|
|
|
"github.com/docker/docker/api/client"
|
|
"github.com/docker/docker/cli"
|
|
"github.com/spf13/cobra"
|
|
)
|
|
|
|
type exportOptions struct {
|
|
container string
|
|
output string
|
|
}
|
|
|
|
// NewExportCommand creates a new `docker export` command
|
|
func NewExportCommand(dockerCli *client.DockerCli) *cobra.Command {
|
|
var opts exportOptions
|
|
|
|
cmd := &cobra.Command{
|
|
Use: "export [OPTIONS] CONTAINER",
|
|
Short: "Export a container's filesystem as a tar archive",
|
|
Args: cli.ExactArgs(1),
|
|
RunE: func(cmd *cobra.Command, args []string) error {
|
|
opts.container = args[0]
|
|
return runExport(dockerCli, opts)
|
|
},
|
|
}
|
|
|
|
flags := cmd.Flags()
|
|
|
|
flags.StringVarP(&opts.output, "output", "o", "", "Write to a file, instead of STDOUT")
|
|
|
|
return cmd
|
|
}
|
|
|
|
func runExport(dockerCli *client.DockerCli, opts exportOptions) error {
|
|
if opts.output == "" && dockerCli.IsTerminalOut() {
|
|
return errors.New("Cowardly refusing to save to a terminal. Use the -o flag or redirect.")
|
|
}
|
|
|
|
clnt := dockerCli.Client()
|
|
|
|
responseBody, err := clnt.ContainerExport(context.Background(), opts.container)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer responseBody.Close()
|
|
|
|
if opts.output == "" {
|
|
_, err := io.Copy(dockerCli.Out(), responseBody)
|
|
return err
|
|
}
|
|
|
|
return client.CopyToFile(opts.output, responseBody)
|
|
}
|