Install pack with the latest tag

CHANGELOG.rst

@@ -4,6 +4,12 @@ Changelog
 in development
 --------------
 
+Changed
+~~~~~~~
+
+* Install pack with the latest tag version if it exists when branch is not specialized.
+  (improvement) #4743
+
 Fixed
 ~~~~~
 

contrib/packs/tests/test_action_download.py

@@ -81,6 +81,22 @@ def mock_is_dir_func(path):
     return original_is_dir_func(path)
 
 
+def mock_get_gitref(repo, ref):
+    """
+    Mock get_gitref function which return mocked object if ref passed is
+    PACK_INDEX['test']['version']
+    """
+    if PACK_INDEX['test']['version'] in ref:
+        if ref[0] == 'v':
+            return mock.MagicMock(hexsha=PACK_INDEX['test']['version'])
+        else:
+            return None
+    elif ref:
+        return mock.MagicMock(hexsha="abcDef")
+    else:
+        return None
+
+
 @mock.patch.object(pack_service, 'fetch_pack_index', mock.MagicMock(return_value=(PACK_INDEX, {})))
 class DownloadGitRepoActionTestCase(BaseActionTestCase):
     action_cls = DownloadGitRepoAction
@@ -520,7 +536,7 @@ def side_effect(ref):
 
             # Fool _get_gitref into working when its ref == our ref
             def fake_commit(arg_ref):
-                if arg_ref == ref:
+                if not ref or arg_ref == ref:
                     return gitref
                 else:
                     raise BadName()
@@ -572,3 +588,28 @@ def test_run_pack_download_local_directory(self):
         destination_path = os.path.join(self.repo_base, 'test4')
         self.assertTrue(os.path.exists(destination_path))
         self.assertTrue(os.path.exists(os.path.join(destination_path, 'pack.yaml')))
+
+    @mock.patch('st2common.util.pack_management.get_gitref', mock_get_gitref)
+    def test_run_pack_download_with_tag(self):
+        action = self.get_action_instance()
+        result = action.run(packs=['test'], abs_repo_base=self.repo_base)
+        temp_dir = hashlib.md5(PACK_INDEX['test']['repo_url'].encode()).hexdigest()
+
+        self.assertEqual(result, {'test': 'Success.'})
+        self.clone_from.assert_called_once_with(PACK_INDEX['test']['repo_url'],
+                                                os.path.join(os.path.expanduser('~'), temp_dir))
+        self.assertTrue(os.path.isfile(os.path.join(self.repo_base, 'test/pack.yaml')))
+
+        # Check repo.git.checkout is called three times
+        self.assertEqual(self.repo_instance.git.checkout.call_count, 3)
+
+        # Check repo.git.checkout called with latest tag or branch
+        self.assertEqual(PACK_INDEX['test']['version'],
+                         self.repo_instance.git.checkout.call_args_list[1][0][0])
+
+        # Check repo.git.checkout called with head
+        self.assertEqual(self.repo_instance.head.reference,
+                         self.repo_instance.git.checkout.call_args_list[2][0][0])
+
+        self.repo_instance.git.branch.assert_called_with(
+            '-f', self.repo_instance.head.reference, PACK_INDEX['test']['version'])

st2common/st2common/util/pack_management.py

@@ -370,7 +370,7 @@ def get_repo_url(pack, proxy_config=None):
         if not pack:
             raise Exception('No record of the "%s" pack in the index.' % (name_or_url))
 
-        return (pack['repo_url'], version)
+        return (pack['repo_url'], version or pack['version'])
     else:
         return (eval_repo_url(name_or_url), version)