Validate image tags to contain required tags for plugin

Add method check_required_image_tags to validations/base.py which checks image tags to containing required tags
Add validation required tags for default image to cluster create validation and cluster create template validation
Add unit tests for this methods

Fixes: bug #1204410

Change-Id: Iff80057106fc73fc5f29b5a1f983f99b33840b73

savanna/tests/unit/service/validation/test_cluster_create_validation.py

@@ -162,3 +162,6 @@ class TestClusterCreateValidation(u.ValidationTestCase):
                 'default_image_id': '550e8400-e29b-41d4-a716-446655440000'
             }
         )
+
+    def test_cluster_create_v_default_image_required_tags(self):
+        self._assert_cluster_default_image_tags_validation()

savanna/tests/unit/service/validation/test_cluster_template_create_validation.py

@@ -200,3 +200,6 @@ class TestClusterTemplateCreateValidation(u.ValidationTestCase):
             bad_req_i=(1, 'NAME_ALREADY_EXISTS',
                        "Cluster template with name 'test' already exists")
         )
+
+    def test_cluster_create_v_default_image_required_tags(self):
+            self._assert_cluster_default_image_tags_validation()

savanna/tests/unit/service/validation/utils.py

@@ -74,7 +74,9 @@ def start_patch():
         mock.patch("savanna.service.api.get_cluster_template")
     nova_p = mock.patch("savanna.utils.openstack.nova.client")
     keystone_p = mock.patch("savanna.utils.openstack.keystone.client")
+    get_image_p = mock.patch("savanna.service.api.get_image")
 
+    get_image = get_image_p.start()
     get_clusters = get_clusters_p.start()
     get_cluster = get_cluster_p.start()
     get_ng_templates = get_ng_templates_p.start()
@@ -103,11 +105,32 @@ def start_patch():
     keystone().services.list.side_effect = _services_list
 
     class Image:
+        def __init__(self, name='test'):
+            self.name = name
+
         @property
         def id(self):
-            return '550e8400-e29b-41d4-a716-446655440000'
+            if self.name == 'test':
+                return '550e8400-e29b-41d4-a716-446655440000'
+            else:
+                return '813fe450-40d2-4acc-ade5-ea753a1bd5bc'
 
-    nova().images.list_registered.return_value = [Image()]
+        @property
+        def tags(self):
+            if self.name == 'test':
+                return ['vanilla', '1.1.2']
+            else:
+                return ['wrong_tag']
+
+    def _get_image(id):
+        if id == '550e8400-e29b-41d4-a716-446655440000':
+            return Image()
+        else:
+            return Image('wrong_test')
+
+    get_image.side_effect = _get_image
+    nova().images.list_registered.return_value = [Image(),
+                                                  Image(name='wrong_name')]
     cluster = m.Cluster('test', 't', 'vanilla', '1.2.2')
     cluster.id = 1
     cluster.status = 'Active'
@@ -143,7 +166,8 @@ def start_patch():
     # request data to validate
     patchers = (get_clusters_p, get_ng_templates_p, get_ng_template_p,
                 get_plugins_p, get_plugin_p,
-                get_cl_template_p, get_cl_templates_p, nova_p, keystone_p)
+                get_cl_template_p, get_cl_templates_p, nova_p, keystone_p,
+                get_image_p)
     return patchers
 
 
@@ -278,3 +302,25 @@ class ValidationTestCase(unittest2.TestCase):
                        "Plugin's applicable target 'HDFS' doesn't "
                        "contain config with name 's'")
         )
+
+    def _assert_cluster_default_image_tags_validation(self):
+        data = {
+            'name': 'test-cluster',
+            'plugin_name': 'vanilla',
+            'hadoop_version': '1.1.2',
+            'default_image_id': '550e8400-e29b-41d4-a716-446655440000'
+        }
+        self._assert_create_object_validation(data=data)
+        data = {
+            'name': 'test-cluster',
+            'plugin_name': 'vanilla',
+            'hadoop_version': '1.1.2',
+            'default_image_id': '813fe450-40d2-4acc-ade5-ea753a1bd5bc'
+        }
+        self._assert_create_object_validation(
+            data=data,
+            bad_req_i=(1, 'INVALID_REFERENCE',
+                       "Tags of requested image "
+                       "'813fe450-40d2-4acc-ade5-ea753a1bd5bc' "
+                       "don't contain required tags "
+                       "['vanilla', '1.1.2']"))