Support .deb archives that contain an uncompressed control.tar. Thanks to...

Support .deb archives that contain an uncompressed control.tar. Thanks to Roderich Schupp <roderich.schupp@gmail.com> for the bug report. (Closes: #903391)

diffoscope/comparators/deb.py

@@ -110,7 +110,7 @@ class DebFile(File):
             control_tar = self.as_container.control_tar
             md5sums_file = control_tar.as_container.lookup_file(
                 './md5sums') if control_tar else None
-            if md5sums_file:
+            if isinstance(md5sums_file, Md5sumsFile):
                 self._md5sums = md5sums_file.parse()
             else:
                 logger.debug("Unable to find a md5sums file")

tests/comparators/test_deb.py

@@ -130,6 +130,8 @@ def test_compare_non_existing(monkeypatch, deb1):
 
 bug881937_deb1 = load_fixture('bug881937_1.deb')
 bug881937_deb2 = load_fixture('bug881937_2.deb')
+bug903391_deb1 = load_fixture('bug903391_1.deb')
+bug903391_deb2 = load_fixture('bug903391_2.deb')
 
 
 @skip_unless_tools_exist('xz')
@@ -139,3 +141,7 @@ def test_compare_different_compression(bug881937_deb1, bug881937_deb2):
     assert difference.details[1].source2 == 'control.tar.xz'
     expected_diff = get_data('bug881937_control_expected_diff')
     assert difference.details[1].details[2].details[1].unified_diff == expected_diff
+
+
+def test_uncompressed_control_tar(bug903391_deb1, bug903391_deb2):
+    bug903391_deb1.compare(bug903391_deb2)