Support custom batch_branch_name from parameter

If nothing is set, we use old default branch name

marge/app.py

@@ -137,6 +137,12 @@ def regexp(str_regex):
         action='store_true',
         help='Enable processing MRs in batches\n',
     )
+    parser.add_argument(
+        '--batch-branch-name',
+        type=str,
+        default=None,
+        help='Branch name when batching is enabled\n',
+    )
     parser.add_argument(
         '--add-part-of',
         action='store_true',
@@ -249,6 +255,8 @@ def regexp(str_regex):
         raise MargeBotCliArgError('--use-merge-strategy and --batch are currently mutually exclusive')
     if config.use_merge_strategy and config.add_tested:
         raise MargeBotCliArgError('--use-merge-strategy and --add-tested are currently mutually exclusive')
+    if config.batch_branch_name and not config.batch:
+        raise MargeBotCliArgError('Setting --batch-branch-name without enabling --batch is not supported')
     if config.rebase_remotely:
         conflicting_flag = [
             '--use-merge-strategy',
@@ -351,6 +359,7 @@ def main(args=None):
                 guarantee_final_pipeline=options.guarantee_final_pipeline,
             ),
             batch=options.batch,
+            batch_branch_name=options.batch_branch_name
             cli=options.cli,
         )
 

marge/batch_job.py

@@ -15,24 +15,28 @@ class CannotBatch(Exception):
 
 
 class BatchMergeJob(MergeJob):
-    BATCH_BRANCH_NAME = 'marge_bot_batch_merge_job'
+    DEFAULT_BATCH_BRANCH_NAME = 'marge_bot_batch_merge_job'
 
-    def __init__(self, *, api, user, project, repo, options, merge_requests):
+    def __init__(self, *, api, user, project, repo, options, merge_requests, batch_branch_name):
         super().__init__(api=api, user=user, project=project, repo=repo, options=options)
+        if not batch_branch_name:
+            self.batch_branch_name = DEFAULT_BATCH_BRANCH_NAME
+        else:
+            self.batch_branch_name = batch_branch_name
         self._merge_requests = merge_requests
 
     def remove_batch_branch(self):
         log.info('Removing local batch branch')
         try:
-            self._repo.remove_branch(BatchMergeJob.BATCH_BRANCH_NAME)
+            self._repo.remove_branch(self.batch_branch_name)
         except git.GitError:
             pass
 
     def close_batch_mr(self):
         log.info('Closing batch MRs')
         params = {
             'author_id': self._user.id,
-            'labels': BatchMergeJob.BATCH_BRANCH_NAME,
+            'labels': self.batch_branch_name,
             'state': 'opened',
             'order_by': 'created_at',
             'sort': 'desc',
@@ -50,10 +54,10 @@ def create_batch_mr(self, target_branch):
         self.push_batch()
         log.info('Creating batch MR')
         params = {
-            'source_branch': BatchMergeJob.BATCH_BRANCH_NAME,
+            'source_branch': self.batch_branch_name,
             'target_branch': target_branch,
             'title': 'Marge Bot Batch MR - DO NOT TOUCH',
-            'labels': BatchMergeJob.BATCH_BRANCH_NAME,
+            'labels': self.batch_branch_name,
         }
         batch_mr = MergeRequest.create(
             api=self._api,
@@ -96,7 +100,7 @@ def get_mergeable_mrs(self, merge_requests):
 
     def push_batch(self):
         log.info('Pushing batch branch')
-        self._repo.push(BatchMergeJob.BATCH_BRANCH_NAME, force=True)
+        self._repo.push(self.batch_branch_name, force=True)
 
     def ensure_mr_not_changed(self, merge_request):
         log.info('Ensuring MR !%s did not change', merge_request.iid)
@@ -218,7 +222,7 @@ def execute(self):
         remote_target_branch_sha = self._repo.get_commit_hash('origin/%s' % target_branch)
 
         self._repo.checkout_branch(target_branch, 'origin/%s' % target_branch)
-        self._repo.checkout_branch(BatchMergeJob.BATCH_BRANCH_NAME, 'origin/%s' % target_branch)
+        self._repo.checkout_branch(self.batch_branch_name, 'origin/%s' % target_branch)
 
         batch_mr = self.create_batch_mr(
             target_branch=target_branch,
@@ -243,7 +247,7 @@ def execute(self):
                     )
                     # Update <batch> branch with MR changes
                     batch_mr_sha = self._repo.merge(
-                        BatchMergeJob.BATCH_BRANCH_NAME,
+                        self.batch_branch_name,
                         merge_request.source_branch,
                         '-m',
                         'Batch merge !%s into %s (!%s)' % (
@@ -257,13 +261,13 @@ def execute(self):
                     # Update <source_branch> on latest <batch> branch so it contains previous MRs
                     self.fuse(
                         merge_request.source_branch,
-                        BatchMergeJob.BATCH_BRANCH_NAME,
+                        self.batch_branch_name,
                         source_repo_url=source_repo_url,
                         local=True,
                     )
                     # Update <batch> branch with MR changes
                     batch_mr_sha = self._repo.fast_forward(
-                        BatchMergeJob.BATCH_BRANCH_NAME,
+                        self.batch_branch_name,
                         merge_request.source_branch,
                         local=True,
                     )

marge/bot.py

@@ -167,6 +167,7 @@ def _process_merge_requests(self, repo_manager, project, merge_requests):
                 merge_requests=merge_requests,
                 repo=repo,
                 options=self._config.merge_opts,
+                batch_branch_name=self._options.batch_branch_name,
             )
             try:
                 batch_merge_job.execute()
@@ -199,7 +200,8 @@ def _get_single_job(self, project, merge_request, repo, options):
 
 class BotConfig(namedtuple('BotConfig',
                            'user use_https auth_token ssh_key_file project_regexp merge_order merge_opts ' +
-                           'git_timeout git_reference_repo branch_regexp source_branch_regexp batch cli')):
+                           'git_timeout git_reference_repo branch_regexp source_branch_regexp batch cli ' + 
+                           'batch_branch_name')):
     pass
 
 

tests/test_batch_job.py

@@ -51,7 +51,7 @@ def test_remove_batch_branch(self, api, mocklab):
         batch_merge_job = self.get_batch_merge_job(api, mocklab, repo=repo)
         batch_merge_job.remove_batch_branch()
         repo.remove_branch.assert_called_once_with(
-            BatchMergeJob.BATCH_BRANCH_NAME,
+            batch_merge_job.batch_branch_name,
         )
 
     def test_close_batch_mr(self, api, mocklab):
@@ -64,7 +64,7 @@ def test_close_batch_mr(self, api, mocklab):
 
             params = {
                 'author_id': batch_merge_job._user.id,
-                'labels': BatchMergeJob.BATCH_BRANCH_NAME,
+                'labels': batch_merge_job.batch_branch_name,
                 'state': 'opened',
                 'order_by': 'created_at',
                 'sort': 'desc',
@@ -86,10 +86,10 @@ def test_create_batch_mr(self, api, mocklab):
             r_batch_mr = batch_merge_job.create_batch_mr(target_branch)
 
             params = {
-                'source_branch': BatchMergeJob.BATCH_BRANCH_NAME,
+                'source_branch': batch_merge_job.batch_branch_name,
                 'target_branch': target_branch,
                 'title': 'Marge Bot Batch MR - DO NOT TOUCH',
-                'labels': BatchMergeJob.BATCH_BRANCH_NAME,
+                'labels': batch_merge_job.batch_branch_name,
             }
             mr_class.create.assert_called_once_with(
                 api=ANY,
@@ -134,7 +134,7 @@ def test_push_batch(self, api, mocklab):
         batch_merge_job = self.get_batch_merge_job(api, mocklab)
         batch_merge_job.push_batch()
         batch_merge_job._repo.push.assert_called_once_with(
-            BatchMergeJob.BATCH_BRANCH_NAME,
+            batch_merge_job.batch_branch_name,
             force=True,
         )