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57 lines
1.3 KiB
Go
57 lines
1.3 KiB
Go
package image
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import (
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"errors"
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"io"
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"golang.org/x/net/context"
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"github.com/docker/docker/api/client"
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"github.com/docker/docker/cli"
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"github.com/spf13/cobra"
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)
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type saveOptions struct {
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images []string
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output string
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}
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// NewSaveCommand creates a new `docker save` command
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func NewSaveCommand(dockerCli *client.DockerCli) *cobra.Command {
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var opts saveOptions
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cmd := &cobra.Command{
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Use: "save [OPTIONS] IMAGE [IMAGE...]",
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Short: "Save one or more images to a tar archive (streamed to STDOUT by default)",
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Args: cli.RequiresMinArgs(1),
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RunE: func(cmd *cobra.Command, args []string) error {
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opts.images = args
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return runSave(dockerCli, opts)
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},
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}
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flags := cmd.Flags()
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flags.StringVarP(&opts.output, "output", "o", "", "Write to a file, instead of STDOUT")
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return cmd
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}
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func runSave(dockerCli *client.DockerCli, opts saveOptions) error {
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if opts.output == "" && dockerCli.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 := dockerCli.Client().ImageSave(context.Background(), opts.images)
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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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if opts.output == "" {
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_, err := io.Copy(dockerCli.Out(), responseBody)
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return err
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}
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return client.CopyToFile(opts.output, responseBody)
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}
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