diff --git a/poky/meta/classes-recipe/externalsrc.bbclass b/poky/meta/classes-recipe/externalsrc.bbclass
index 51dbe9e..06a9548 100644
--- a/poky/meta/classes-recipe/externalsrc.bbclass
+++ b/poky/meta/classes-recipe/externalsrc.bbclass
@@ -91,16 +91,18 @@
                 # Since configure will likely touch ${S}, ensure only we lock so one task has access at a time
                 d.appendVarFlag(task, "lockfiles", " ${S}/singletask.lock")
 
-            for funcname in [task, "base_" + task, "kernel_" + task]:
+        for v in d.keys():
+            cleandirs = d.getVarFlag(v, "cleandirs", False)
+            if cleandirs:
                 # We do not want our source to be wiped out, ever (kernel.bbclass does this for do_clean)
-                cleandirs = oe.recipeutils.split_var_value(d.getVarFlag(funcname, 'cleandirs', False) or '')
+                cleandirs = oe.recipeutils.split_var_value(cleandirs)
                 setvalue = False
                 for cleandir in cleandirs[:]:
                     if oe.path.is_path_parent(externalsrc, d.expand(cleandir)):
                         cleandirs.remove(cleandir)
                         setvalue = True
                 if setvalue:
-                    d.setVarFlag(funcname, 'cleandirs', ' '.join(cleandirs))
+                    d.setVarFlag(v, 'cleandirs', ' '.join(cleandirs))
 
         fetch_tasks = ['do_fetch', 'do_unpack']
         # If we deltask do_patch, there's no dependency to ensure do_unpack gets run, so add one
@@ -228,15 +230,16 @@
             env['GIT_INDEX_FILE'] = tmp_index.name
             subprocess.check_output(['git', 'add', '-A', '.'], cwd=s_dir, env=env)
             git_sha1 = subprocess.check_output(['git', 'write-tree'], cwd=s_dir, env=env).decode("utf-8")
-            submodule_helper = subprocess.check_output(['git', 'submodule--helper', 'list'], cwd=s_dir, env=env).decode("utf-8")
-            for line in submodule_helper.splitlines():
-                module_dir = os.path.join(s_dir, line.rsplit(maxsplit=1)[1])
-                if os.path.isdir(module_dir):
-                    proc = subprocess.Popen(['git', 'add', '-A', '.'], cwd=module_dir, env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
-                    proc.communicate()
-                    proc = subprocess.Popen(['git', 'write-tree'], cwd=module_dir, env=env, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
-                    stdout, _ = proc.communicate()
-                    git_sha1 += stdout.decode("utf-8")
+            if os.path.exists(".gitmodules"):
+                submodule_helper = subprocess.check_output(["git", "config", "--file", ".gitmodules", "--get-regexp", "path"], cwd=s_dir, env=env).decode("utf-8")
+                for line in submodule_helper.splitlines():
+                    module_dir = os.path.join(s_dir, line.rsplit(maxsplit=1)[1])
+                    if os.path.isdir(module_dir):
+                        proc = subprocess.Popen(['git', 'add', '-A', '.'], cwd=module_dir, env=env, stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL)
+                        proc.communicate()
+                        proc = subprocess.Popen(['git', 'write-tree'], cwd=module_dir, env=env, stdout=subprocess.PIPE, stderr=subprocess.DEVNULL)
+                        stdout, _ = proc.communicate()
+                        git_sha1 += stdout.decode("utf-8")
             sha1 = hashlib.sha1(git_sha1.encode("utf-8")).hexdigest()
         with open(oe_hash_file, 'w') as fobj:
             fobj.write(sha1)