Accept "Fix: " as a bug line am: e745062e33

Original change: https://android-review.googlesource.com/c/platform/tools/repohooks/+/3295916

Change-Id: I9507260024ec8a1acc27c4a1b519a85d4d054061
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
diff --git a/rh/hooks.py b/rh/hooks.py
index 5dc7911..8588f93 100644
--- a/rh/hooks.py
+++ b/rh/hooks.py
@@ -497,13 +497,12 @@
 
 
 def check_commit_msg_bug_field(project, commit, desc, _diff, options=None):
-    """Check the commit message for a 'Bug:' line."""
-    field = 'Bug'
-    regex = fr'^{field}: (None|[0-9]+(, [0-9]+)*)$'
+    """Check the commit message for a 'Bug:' or 'Fix:' line."""
+    regex = r'^(Bug|Fix): (None|[0-9]+(, [0-9]+)*)$'
     check_re = re.compile(regex)
 
     if options.args():
-        raise ValueError(f'commit msg {field} check takes no options')
+        raise ValueError('commit msg Bug check takes no options')
 
     found = []
     for line in desc.splitlines():
@@ -512,13 +511,13 @@
 
     if not found:
         error = (
-            f'Commit message is missing a "{field}:" line.  It must match the\n'
+            'Commit message is missing a "Bug:" line.  It must match the\n'
             f'following case-sensitive regex:\n\n    {regex}'
         )
     else:
         return None
 
-    return [rh.results.HookResult(f'commit msg: "{field}:" check',
+    return [rh.results.HookResult('commit msg: "Bug:" check',
                                   project, commit, error=error)]
 
 
diff --git a/rh/hooks_unittest.py b/rh/hooks_unittest.py
index 1fc0c15..a54e24f 100755
--- a/rh/hooks_unittest.py
+++ b/rh/hooks_unittest.py
@@ -473,6 +473,7 @@
             rh.hooks.check_commit_msg_bug_field, True, (
                 'subj\n\nBug: 1234\n',
                 'subj\n\nBug: 1234\nChange-Id: blah\n',
+                'subj\n\nFix: 1234\n',
             ))
 
         # Check some bad messages.
@@ -483,6 +484,7 @@
                 'subj\n\nBUG: 1234\n',
                 'subj\n\nBug: N/A\n',
                 'subj\n\nBug:\n',
+                'subj\n\nFIX=1234\n',
             ))
 
     def test_commit_msg_changeid_field(self, _mock_check, _mock_run):