[live-images] Fix crash when repo_from is not a list

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/phases/live_images.py

@@ -22,7 +22,7 @@ import pipes
 import shutil
 
 from kobo.threads import ThreadPool, WorkerThread
-from kobo.shortcuts import run, save_to_file
+from kobo.shortcuts import run, save_to_file, force_list
 from productmd.images import Image
 
 from pungi.wrappers.kojiwrapper import KojiWrapper
@@ -106,7 +106,7 @@ class LiveImagesPhase(PhaseBase):
 
         # additional repos
         repos.extend(data.get("additional_repos", []))
-        repos.extend(self._get_extra_repos(arch, variant, data.get('repo_from', [])))
+        repos.extend(self._get_extra_repos(arch, variant, force_list(data.get('repo_from', []))))
         return repos
 
     def _get_release(self, image_conf):

tests/test_liveimagesphase.py

@@ -59,6 +59,49 @@ class TestLiveImagesPhase(PungiTestCase):
                                           compose.variants['Client'],
                                           'amd64'))])
 
+    @mock.patch('pungi.phases.live_images.ThreadPool')
+    def test_live_image_build_single_repo_from(self, ThreadPool):
+        compose = DummyCompose(self.topdir, {
+            'live_images': [
+                ('^Client$', {
+                    'amd64': {
+                        'kickstart': 'test.ks',
+                        'additional_repos': ['http://example.com/repo/'],
+                        'repo_from': 'Everything',
+                        'release': None,
+                    }
+                })
+            ],
+        })
+
+        phase = LiveImagesPhase(compose)
+
+        phase.run()
+
+        # assert at least one thread was started
+        self.assertTrue(phase.pool.add.called)
+        self.maxDiff = None
+        self.assertItemsEqual(phase.pool.queue_put.mock_calls,
+                              [mock.call((compose,
+                                          {'ks_file': 'test.ks',
+                                           'build_arch': 'amd64',
+                                           'dest_dir': self.topdir + '/compose/Client/amd64/iso',
+                                           'scratch': False,
+                                           'repos': [self.topdir + '/compose/Client/amd64/os',
+                                                     'http://example.com/repo/',
+                                                     self.topdir + '/compose/Everything/amd64/os'],
+                                           'label': '',
+                                           'name': None,
+                                           'filename': 'image-name',
+                                           'version': None,
+                                           'specfile': None,
+                                           'sign': False,
+                                           'type': 'live',
+                                           'release': '20151203.0',
+                                           'ksurl': None},
+                                          compose.variants['Client'],
+                                          'amd64'))])
+
     @mock.patch('pungi.phases.live_images.ThreadPool')
     def test_live_image_build_without_rename(self, ThreadPool):
         compose = DummyCompose(self.topdir, {