package image import ( "context" "io" "github.com/docker/cli/cli" "github.com/docker/cli/cli/command" "github.com/docker/cli/cli/command/completion" "github.com/docker/docker/pkg/jsonmessage" "github.com/moby/sys/sequential" "github.com/pkg/errors" "github.com/spf13/cobra" ) type loadOptions struct { input string quiet bool } // NewLoadCommand creates a new `docker load` command func NewLoadCommand(dockerCli command.Cli) *cobra.Command { var opts loadOptions cmd := &cobra.Command{ Use: "load [OPTIONS]", Short: "Load an image from a tar archive or STDIN", Args: cli.NoArgs, RunE: func(cmd *cobra.Command, args []string) error { return runLoad(dockerCli, opts) }, Annotations: map[string]string{ "aliases": "docker image load, docker load", }, ValidArgsFunction: completion.NoComplete, } flags := cmd.Flags() flags.StringVarP(&opts.input, "input", "i", "", "Read from tar archive file, instead of STDIN") flags.BoolVarP(&opts.quiet, "quiet", "q", false, "Suppress the load output") return cmd } func runLoad(dockerCli command.Cli, opts loadOptions) error { var input io.Reader = dockerCli.In() if opts.input != "" { // We use sequential.Open to use sequential file access on Windows, avoiding // depleting the standby list un-necessarily. On Linux, this equates to a regular os.Open. file, err := sequential.Open(opts.input) if err != nil { return err } defer file.Close() input = file } // To avoid getting stuck, verify that a tar file is given either in // the input flag or through stdin and if not display an error message and exit. if opts.input == "" && dockerCli.In().IsTerminal() { return errors.Errorf("requested load from stdin, but stdin is empty") } if !dockerCli.Out().IsTerminal() { opts.quiet = true } response, err := dockerCli.Client().ImageLoad(context.Background(), input, opts.quiet) if err != nil { return err } defer response.Body.Close() if response.Body != nil && response.JSON { return jsonmessage.DisplayJSONMessagesToStream(response.Body, dockerCli.Out(), nil) } _, err = io.Copy(dockerCli.Out(), response.Body) return err }