util: Strip file:// from local urls

Make sure that the function returns a path even for local files
specified by file:// urls.

JIRA: RHELCMP-5340
Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>

pungi/util.py

@@ -1046,6 +1046,8 @@ def as_local_file(url):
             yield local_filename
         finally:
             os.remove(local_filename)
+    elif url.startswith("file://"):
+        yield url[7:]
     else:
         # Not a remote url, return unchanged.
         yield url

tests/test_util.py

@@ -1060,3 +1060,8 @@ class TestAsLocalFile(PungiTestCase):
             self.assertEqual(fn, self.filename)
             self.assertTrue(os.path.exists(self.filename))
         self.assertFalse(os.path.exists(self.filename))
+
+    def test_file_url(self, urlretrieve):
+        with util.as_local_file("file:///tmp/foo") as fn:
+            self.assertEqual(fn, "/tmp/foo")
+        self.assertEqual(urlretrieve.call_args_list, [])