add save flags

cmd/sealer/cmd/image/save.go

@@ -62,6 +62,7 @@ func NewSaveCmd() *cobra.Command {
 	flags.StringVar(&saveOpts.Format, "format", buildah.OCIArchive, "Save image to oci-archive, oci-dir (directory with oci manifest type), docker-archive, docker-dir (directory with v2s2 manifest type)")
 	flags.StringVarP(&saveOpts.Output, "output", "o", "", "Write image to a specified file")
 	flags.BoolVarP(&saveOpts.Quiet, "quiet", "q", false, "Suppress the output")
+	flags.StringVar(&saveOpts.TmpDir, "tmp-dir", "", "set temporary directory when save image. if not set, use system`s temporary directory")
 	flags.BoolVar(&saveOpts.Compress, "compress", false, "Compress tarball image layers when saving to a directory using the 'dir' transport. (default is same compression type as source)")
 	if err := saveCmd.MarkFlagRequired("output"); err != nil {
 		logrus.Errorf("failed to init flag: %v", err)

pkg/define/options/options.go

@@ -128,6 +128,7 @@ type SaveOptions struct {
 	Output            string
 	Quiet             bool
 	ImageNameOrID     string
+	TmpDir            string
 }
 
 type LoadOptions struct {

pkg/imageengine/buildah/save.go

@@ -78,7 +78,7 @@ func (engine *Engine) Save(opts *options.SaveOptions) error {
 		}
 	}()
 
-	tempDir, err := os.MkdirTemp("", "sealer-save-tmp")
+	tempDir, err := os.MkdirTemp(opts.TmpDir, "sealer-save-tmp")
 	if err != nil {
 		return fmt.Errorf("failed to create %s, err: %v", tempDir, err)
 	}