mirror of https://github.com/docker/cli.git
74 lines
1.7 KiB
Go
74 lines
1.7 KiB
Go
package image
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import (
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"context"
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"io"
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"os"
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"path/filepath"
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"github.com/docker/cli/cli"
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"github.com/docker/cli/cli/command"
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"github.com/pkg/errors"
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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 command.Cli) *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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// RunSave performs a save against the engine based on the specified options
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func RunSave(dockerCli command.Cli, opts saveOptions) error {
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if opts.output == "" && dockerCli.Out().IsTerminal() {
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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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if err := validateOutputPath(opts.output); err != nil {
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return errors.Wrap(err, "failed to save image")
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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 command.CopyToFile(opts.output, responseBody)
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}
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func validateOutputPath(path string) error {
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dir := filepath.Dir(path)
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if dir != "" && dir != "." {
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if _, err := os.Stat(dir); os.IsNotExist(err) {
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return errors.Errorf("unable to validate output path: directory %q does not exist", dir)
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}
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}
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return nil
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}
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