bin/ci_run_n_monitor: automatically pick MR pipelines when they exist

When an MR has been created, we usually want to run the jobs in the MR
pipeline so that reviewers see that things work as expected.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25153>

bin/ci/ci_run_n_monitor.py

@@ -315,10 +315,13 @@ if __name__ == "__main__":
             pipe = cur_project.pipelines.get(pipeline_id)
             REV = pipe.sha
         else:
-            cur_project = get_gitlab_project(gl, args.project)
             if not REV:
                 REV = check_output(['git', 'rev-parse', 'HEAD']).decode('ascii').strip()
-            pipe = wait_for_pipeline(cur_project, REV)
+            cur_project = gl.projects.get("mesa/mesa")
+            pipe = wait_for_pipeline(cur_project, REV, timeout=10)
+            if not pipe:
+                cur_project = get_gitlab_project(gl, args.project)
+                pipe = wait_for_pipeline(cur_project, REV)
 
         print(f"Revision: {REV}")
         print(f"Pipeline: {pipe.web_url}")

bin/ci/gitlab_common.py

@@ -30,13 +30,17 @@ def read_token(token_arg: Optional[str]) -> str:
     )
 
 
-def wait_for_pipeline(project, sha: str):
+def wait_for_pipeline(project, sha: str, timeout=None):
     """await until pipeline appears in Gitlab"""
     print(f"⏲ for the pipeline to appear in {project.path_with_namespace}..", end="")
+    start_time = time.time()
     while True:
         pipelines = project.pipelines.list(sha=sha)
         if pipelines:
             print("", flush=True)
             return pipelines[0]
         print("", end=".", flush=True)
+        if timeout and time.time() - start_time > timeout:
+            print(" not found", flush=True)
+            return None
         time.sleep(1)