Avoid CLI crash if image has no tags

Signed-off-by: Joffrey F <joffrey@docker.com>

compose/cli/main.py

@@ -511,7 +511,10 @@ class TopLevelCommand(object):
             rows = []
             for container in containers:
                 image_config = container.image_config
-                repo_tags = image_config['RepoTags'][0].rsplit(':', 1)
+                repo_tags = (
+                    image_config['RepoTags'][0].rsplit(':', 1) if image_config['RepoTags']
+                    else ('<none>', '<none>')
+                )
                 image_id = image_config['Id'].split(':')[1][:12]
                 size = human_readable_file_size(image_config['Size'])
                 rows.append([

tests/acceptance/cli_test.py

@@ -2447,14 +2447,30 @@ class CLITestCase(DockerClientTestCase):
         assert 'multiplecomposefiles_another_1' in result.stdout
         assert 'multiplecomposefiles_simple_1' in result.stdout
 
+    @mock.patch.dict(os.environ)
+    def test_images_tagless_image(self):
+        self.base_dir = 'tests/fixtures/tagless-image'
+        stream = self.client.build(self.base_dir, decode=True)
+        img_id = None
+        for data in stream:
+            if 'aux' in data:
+                img_id = data['aux']['ID']
+                break
+            if 'stream' in data and 'Successfully built' in data['stream']:
+                img_id = self.client.inspect_image(data['stream'].split(' ')[2].strip())['Id']
+
+        assert img_id
+
+        os.environ['IMAGE_ID'] = img_id
+        self.project.get_service('foo').create_container()
+        result = self.dispatch(['images'])
+        assert '<none>' in result.stdout
+        assert 'taglessimage_foo_1' in result.stdout
+
     def test_up_with_override_yaml(self):
         self.base_dir = 'tests/fixtures/override-yaml-files'
         self._project = get_project(self.base_dir, [])
-        self.dispatch(
-            [
-                'up', '-d',
-            ],
-            None)
+        self.dispatch(['up', '-d'], None)
 
         containers = self.project.containers()
         self.assertEqual(len(containers), 2)

tests/fixtures/tagless-image/Dockerfile

@@ -0,0 +1,2 @@
+FROM busybox:latest
+RUN touch /blah

tests/fixtures/tagless-image/docker-compose.yml

@@ -0,0 +1,5 @@
+version: '2.3'
+services:
+  foo:
+    image: ${IMAGE_ID}
+    command: top