docker/cli · error

saving creds: %w

Error message

saving creds: %w

What it means

Error "saving creds: %w" thrown in docker/cli.

Source

Thrown at cli/command/container/create.go:406

		return fmt.Errorf(
			"invalid pull option: '%s': must be one of %q, %q or %q",
			val,
			PullImageAlways,
			PullImageMissing,
			PullImageNever,
		)
	}
}

// copyDockerConfigIntoContainer takes the client configuration and copies it
// into the container.
//
// The path should be an absolute path in the container, commonly
// /root/.docker/config.json.
func copyDockerConfigIntoContainer(ctx context.Context, apiClient client.APIClient, containerID string, configPath string, config *configfile.ConfigFile) error {
	var configBuf bytes.Buffer
	if err := config.SaveToWriter(&configBuf); err != nil {
		return fmt.Errorf("saving creds: %w", err)
	}

	// We don't need to get super fancy with the tar creation.
	var tarBuf bytes.Buffer
	tarWriter := tar.NewWriter(&tarBuf)
	_ = tarWriter.WriteHeader(&tar.Header{
		Name: configPath,
		Size: int64(configBuf.Len()),
		Mode: 0o600,
	})

	if _, err := io.Copy(tarWriter, &configBuf); err != nil {
		_ = tarWriter.Close()
		return fmt.Errorf("writing config to tar file for config copy: %w", err)
	}

	if err := tarWriter.Close(); err != nil {
		return fmt.Errorf("closing tar for config copy failed: %w", err)

View on GitHub (pinned to e9452d6e78)

When it happens

Trigger: Thrown at cli/command/container/create.go:406 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of docker/cli@e9452d6e78 (2026-08-01). Data as JSON: /data/errors/b95627a1d62210fb.json. Report an issue: GitHub.