Fix the merging of group configuration

when that group configuration is a dict => members.

cloudinit/distros/__init__.py

@@ -425,12 +425,36 @@ def _get_arch_package_mirror_info(package_mirrors, arch):
 # is the standard form used in the rest
 # of cloud-init
 def _normalize_groups(grp_cfg):
-    if isinstance(grp_cfg, (str, basestring, list)):
+    if isinstance(grp_cfg, (str, basestring)):
+        grp_cfg = grp_cfg.strip().split(",")
+    if isinstance(grp_cfg, (list)):
         c_grp_cfg = {}
-        for i in util.uniq_merge(grp_cfg):
-            c_grp_cfg[i] = []
+        for i in grp_cfg:
+            if isinstance(i, (dict)):
+                for k, v in i.items():
+                    if k not in c_grp_cfg:
+                        if isinstance(v, (list)):
+                            c_grp_cfg[k] = list(v)
+                        elif isinstance(v, (basestring, str)):
+                            c_grp_cfg[k] = [v]
+                        else:
+                            raise TypeError("Bad group member type %s" %
+                                            util.obj_name(v))
+                    else:
+                        if isinstance(v, (list)):
+                            c_grp_cfg[k].extend(v)
+                        elif isinstance(v, (basestring, str)):
+                            c_grp_cfg[k].append(v)
+                        else:
+                            raise TypeError("Bad group member type %s" %
+                                            util.obj_name(v))
+            elif isinstance(i, (str, basestring)):
+                if i not in c_grp_cfg:
+                    c_grp_cfg[i] = []
+            else:
+                raise TypeError("Unknown group name type %s" %
+                                util.obj_name(i))
         grp_cfg = c_grp_cfg
-
     groups = {}
     if isinstance(grp_cfg, (dict)):
         for (grp_name, grp_members) in grp_cfg.items():

tests/unittests/test_distros/test_user_data_normalize.py

@@ -30,6 +30,28 @@ class TestUGNormalize(MockerTestCase):
     def _norm(self, cfg, distro):
         return distros.normalize_users_groups(cfg, distro)
 
+    def test_group_dict(self):
+        distro = self._make_distro('ubuntu')
+        g = {'groups': [
+                {
+                    'ubuntu': ['foo', 'bar'],
+                    'bob': 'users',
+                },
+                'cloud-users',
+                {
+                    'bob': 'users2',
+                },
+            ]
+        }
+        (users, groups) = self._norm(g, distro)
+        self.assertIn('ubuntu', groups)
+        ub_members = groups['ubuntu']
+        self.assertEquals(sorted(['foo', 'bar']), sorted(ub_members))
+        self.assertIn('bob', groups)
+        b_members = groups['bob']
+        self.assertEquals(sorted(['users', 'users2']), 
+                          sorted(b_members))
+
     def test_basic_groups(self):
         distro = self._make_distro('ubuntu')
         ug_cfg = {