ci_run_n_monitor: add ability to specify the pipeline to use, instead of auto-detecting it

The auto-detection code currently looks for a repo called "mesa" in the
current user's fork (ie. the user providing the api token), which is great for
the common use case, but sometimes needs to be able to be overridden, such as
when running a pipeline in another fork than one's own, when working with
someone else in their fork.

Signed-off-by: Eric Engestrom <eric@igalia.com>
Acked-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23230>

bin/ci/ci_run_n_monitor.py

@@ -26,6 +26,8 @@ from colorama import Fore, Style
 from gitlab_common import get_gitlab_project, read_token, wait_for_pipeline
 from gitlab_gql import GitlabGQL, create_job_needs_dag, filter_dag, print_dag
 
+GITLAB_URL = "https://gitlab.freedesktop.org"
+
 REFRESH_WAIT_LOG = 10
 REFRESH_WAIT_JOBS = 6
 
@@ -239,6 +241,10 @@ def parse_args() -> None:
     parser.add_argument(
         "--rev", metavar="revision", help="repository git revision (default: HEAD)"
     )
+    parser.add_argument(
+        "--pipeline-url",
+        help="URL of the pipeline to use, instead of auto-detecting it.",
+    )
     parser.add_argument(
         "--token",
         metavar="token",
@@ -277,18 +283,30 @@ if __name__ == "__main__":
 
         token = read_token(args.token)
 
-        gl = gitlab.Gitlab(url="https://gitlab.freedesktop.org",
+        gl = gitlab.Gitlab(url=GITLAB_URL,
                            private_token=token,
                            retry_transient_errors=True)
 
-        cur_project = get_gitlab_project(gl, "mesa")
-
         REV: str = args.rev
         if not REV:
             REV = check_output(['git', 'rev-parse', 'HEAD']).decode('ascii').strip()
         print(f"Revision: {REV}")
-        pipe = wait_for_pipeline(cur_project, REV)
+
+        if args.pipeline_url:
+            assert args.pipeline_url.startswith(GITLAB_URL)
+            url_path = args.pipeline_url[len(GITLAB_URL):]
+            url_path_components = url_path.split("/")
+            project_name = "/".join(url_path_components[1:3])
+            assert url_path_components[3] == "-"
+            assert url_path_components[4] == "pipelines"
+            pipeline_id = int(url_path_components[5])
+            cur_project = gl.projects.get(project_name)
+            pipe = cur_project.pipelines.get(pipeline_id)
+        else:
+            cur_project = get_gitlab_project(gl, "mesa")
+            pipe = wait_for_pipeline(cur_project, REV)
         print(f"Pipeline: {pipe.web_url}")
+
         deps = set()
         if args.target:
             print("🞋 job: " + Fore.BLUE + args.target + Style.RESET_ALL)