Chang inter funs name to correct meaning

Signed-off-by: linzhinan(zen Lin) <linzhinan@huawei.com>

units/unit.go

@@ -170,7 +170,7 @@ func (unit *TestUnit) prepareBundle() {
 
 	// Create rootfs for bundle
 	rootfs := unit.BundleDir + "/rootfs"
-	if err := tarRootfs(rootfs); err != nil {
+	if err := untarRootfs(rootfs); err != nil {
 		logrus.Fatalf("tar roofts.tar.gz to %v err: %v\n", rootfs, err)
 	}
 
@@ -220,13 +220,13 @@ func (unit *TestUnit) generateConfigs() {
 		logrus.Debugln(a)
 	}
 
-	err := ocitoolGen(args)
+	err := genConfigs(args)
 	if err != nil {
 		logrus.Fatalf("generate *.json err: %v\n", err)
 	}
 }
 
-func tarRootfs(rootfs string) error {
+func untarRootfs(rootfs string) error {
 	// Create rootfs folder to bundle
 	if err := os.Mkdir(rootfs, os.ModePerm); err != nil {
 		logrus.Fatalf("mkdir rootfs for bundle %v err: %v\n", rootfs, err)
@@ -245,7 +245,7 @@ func tarRootfs(rootfs string) error {
 	return nil
 }
 
-func ocitoolGen(args []string) error {
+func genConfigs(args []string) error {
 	argsNew := make([]string, len(args)+1)
 	argsNew[0] = "generate"
 	for i, a := range args {