feat(core): allows transforms to have custom MR message

cube_doctor/__init__.py

@@ -323,6 +323,13 @@ class Command:
     NO_AUTO_MR = False
     TARGETS = ("cubes", "clients")
 
+    merge_request_description = (
+        "Hello dear contributors,\n\nThis is an auto generated modification to help you improve the"
+        " code base of logilab. If this commit is bad don't hesitate to close this MR and report it"
+        " here https://forge.extranet.logilab.fr/cubicweb/cube-doctor/-/issues."
+        "\n\nKind regards,"
+    )
+
     def pre_check(self, root_files):
         return
 
@@ -439,6 +446,13 @@ class Command:
                     else:
                         commit_message = metadata["commit_message"]
 
+                    if "merge_request_description" in metadata:
+                        merge_request_description = metadata[
+                            "merge_request_description"
+                        ]
+                    else:
+                        merge_request_description = self.merge_request_description
+
                     # if nothing has changed, continue
                     if not repo.run_command("hg status", capture_output=True):
                         logger.info("nothing has changed, skip")
@@ -551,12 +565,7 @@ class Command:
                                 "source_branch": branch_name,
                                 "title": commit_message[:254],
                                 "labels": ["To Review"],
-                                "description": "Hello dear contributors,\n\nThis is an "
-                                "auto generated modification to help you improve the code base "
-                                "of logilab. If this commit is bad don't hesitate to close "
-                                "this MR and report it here "
-                                "https://forge.extranet.logilab.fr/cubicweb/cube-doctor/-/issues."
-                                "\n\nKind regards,",
+                                "description": merge_request_description,
                             }
                         )
                         print(f"\n=> MR created at {mr.attributes['web_url']} \\o/\n")
@@ -579,9 +588,17 @@ class Command:
                                     print("ERROR: you aren't allowed to merge this MR")
                                     break
                             else:
-                                cube.mergerequests.get(mr.iid).merge(
-                                    merge_when_pipeline_succeeds=True
-                                )
+                                try:
+                                    cube.mergerequests.get(mr.iid).merge(
+                                        merge_when_pipeline_succeeds=True
+                                    )
+                                except gitlab.exceptions.GitlabMRClosedError:
+                                    import traceback
+
+                                    traceback.print_exc()
+                                    logger.error(
+                                        f"failed to mark MR {mr} on {cube.name} as merge_when_pipeline_succeeds"
+                                    )
 
                         open("created_mr.log", "a").write(
                             f"{branch_name.split('/')[-1]}: {mr.attributes['web_url']}\n"