Update the open bugs when the corresponding package changes maintainer

Fixes https://pagure.io/fedora-infrastructure/issue/6940

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

distgit_bugzilla_sync/script.py

@@ -234,6 +234,45 @@ class BugzillaProxy:
         bz_email = email_overrides.get(bz_email, bz_email)
         return bz_email
 
+    def update_open_bugs(self, new_poc, prev_poc, product, name):
+        '''Change the package owner
+        :arg new_poc: email of the new point of contact.
+        :arg prev_poc: Username of the previous point of contact
+        :arg product: The product of the package to change in bugzilla
+        :arg name: Name of the package to change the owner.
+        '''
+        bz_query = {}
+        bz_query['product'] = product
+        bz_query['component'] = name
+        bz_query['bug_status'] = [
+            'NEW', 'ASSIGNED', 'ON_DEV', 'ON_QA', 'MODIFIED', 'POST',
+            'FAILS_QA', 'PASSES_QA', 'RELEASE_PENDING']
+        # Update only maintained releases
+        bz_query['version'] = self.config["products_versions"][product]
+
+        query_results = self.server.query(bz_query)
+
+        for bug in query_results:
+            if bug.assigned_to == prev_poc and bug.assigned_to != new_poc:
+                if self.config["verbose"]:
+                    print(
+                        f'    - reassigning bug #{bug.bug_id} '
+                        f'from {bug.assigned_to} to {new_poc}'
+                    )
+                if not self.config["dryrun"]:
+                    try:
+                        bug.setassignee(
+                            assigned_to=new_poc,
+                            comment=self.config['bz_maintainer_change_comment'],
+                        )
+                    except xmlrpc.client.Fault as e:
+                        # Output something useful in args
+                        e.args = (data, e.faultCode, e.faultString)
+                        raise
+                    except xmlrpc.client.ProtocolError as e:
+                        e.args = ('ProtocolError', e.errcode, e.errmsg)
+                        raise
+
     def add_edit_component(self, package, collection, owner, description=None,
                            qacontact=None, cclist=None, print_fas_names=False):
         '''Add or update a component to have the values specified.
@@ -344,6 +383,8 @@ class BugzillaProxy:
                             else:
                                 print(f"    {key} changed from `{old_value}` to `{new_value}`")
 
+                owner_changed = "initialowner" in data
+
                 # FIXME: initialowner has been made mandatory for some
                 # reason.  Asking dkl why.
                 data['initialowner'] = owner_email
@@ -357,6 +398,13 @@ class BugzillaProxy:
                     except xmlrpc.client.ProtocolError as e:
                         e.args = ('ProtocolError', e.errcode, e.errmsg)
                         raise
+                if owner_changed:
+                    self.update_open_bugs(
+                        new_poc=owner_email,
+                        prev_poc=product[pkg_key]['initialowner'],
+                        name=package,
+                        product=self.config['products'][collection],
+                    )
             else:
                 if self.config.get("print-no-change"):
                     print(f"[NOCHANGE] {package}/{self.config['products'][collection]}")