Add script and workflow that is able to "cancel all CI runs for a spe…

…cific PR/commit" (project-chip#35975)

* Add a script and workflow for 'cancel running workflows'.

The intent for this is to allow failing workflows to trigger
a "cancel all the rest of the runs" for a current PR.

* Restyle

* Rename parameter to make it clear it is a github token

* Update scripts/tools/cancel_workflows_for_pr.py

Co-authored-by: C Freeman <[email protected]>

---------

Co-authored-by: Andrei Litvin <[email protected]>
Co-authored-by: C Freeman <[email protected]>

.github/workflows/cancel_workflows_for_pr.yaml

@@ -0,0 +1,55 @@
+# Copyright (c) 2024 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Cancel workflow on PR
+on:
+    workflow_dispatch:
+      inputs:
+        pull_request_id:
+          description: 'PR number to consider'
+          required: true
+          type: number
+        commit_sha:
+          description: 'Cancel runs for this specific SHA'
+          required: true
+          type: string
+
+jobs:
+    cancel_workflow:
+        name: Report on pull requests
+
+        runs-on: ubuntu-latest
+
+        # Don't run on forked repos
+        if: github.repository_owner == 'project-chip'
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v4
+            - uses: actions/setup-python@v5
+              with:
+                python-version: '3.12'
+            - name: Setup pip modules we use
+              run: |
+                  pip install     \
+                      click       \
+                      coloredlogs \
+                      pygithub    \
+                      && echo "DONE installint python prerequisites"
+            - name: Cancel runs
+              run: |
+                  scripts/tools/cancel_workflows_for_pr.py       \
+                    --pull-request ${{ inputs.pull_request_id }} \
+                    --commit-sha "${{ inputs.commit_sha }}"      \
+                    --gh-api-token "${{ secrets.GITHUB_TOKEN }}"

scripts/tools/cancel_workflows_for_pr.py

@@ -0,0 +1,87 @@
+#!/usr/bin/env python3
+#
+# Copyright (c) 2024 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+import logging
+
+import click
+import coloredlogs
+from github import Github
+
+__LOG_LEVELS__ = {
+    "debug": logging.DEBUG,
+    "info": logging.INFO,
+    "warn": logging.WARN,
+    "fatal": logging.FATAL,
+}
+
+REPOSITORY = "project-chip/connectedhomeip"
+
+
+class Canceller:
+    def __init__(self, token):
+        self.api = Github(token)
+        self.repo = self.api.get_repo(REPOSITORY)
+
+    def cancel_all_runs(self, pr_number, commit_sha, dry_run):
+        pr = self.repo.get_pull(pr_number)
+        logging.info("Examining PR '%s'", pr.title)
+        for commit in pr.get_commits():
+            if commit.sha != commit_sha:
+                logging.info("Skipping SHA '%s' as it was not selected", commit.sha)
+                continue
+
+            for check_suite in commit.get_check_suites():
+                for run in check_suite.get_check_runs():
+                    if run.status in {"in_progress", "queued"}:
+                        if dry_run:
+                            logging.warning("DRY RUN: Will not stop run %s", run.name)
+                        else:
+                            logging.warning("Stopping run %s", run.name)
+                            self.repo.get_workflow_run(run.id).cancel()
+                    else:
+                        logging.info("Skip over run %s (%s)", run.name, run.status)
+
+
+@click.command()
+@click.option(
+    "--log-level",
+    default="INFO",
+    type=click.Choice(list(__LOG_LEVELS__.keys()), case_sensitive=False),
+    help="Determines the verbosity of script output.",
+)
+@click.option("--pull-request", type=int, help="Pull request number to consider")
+@click.option("--commit-sha", help="Commit to look at when cancelling pull requests")
+@click.option("--gh-api-token", help="Github token to use")
+@click.option("--token-file", help="Read github token from the given file")
+@click.option("--dry-run", default=False, is_flag=True, help="Actually cancel or not")
+def main(log_level, pull_request, commit_sha, gh_api_token, token_file, dry_run):
+    coloredlogs.install(
+        level=__LOG_LEVELS__[log_level], fmt="%(asctime)s %(levelname)-7s %(message)s"
+    )
+
+    if gh_api_token:
+        gh_token = gh_api_token
+    elif token_file:
+        gh_token = open(token_file, "rt").read().strip()
+    else:
+        raise Exception("Require a --gh-api-token or --token-file to access github")
+
+    Canceller(gh_token).cancel_all_runs(pull_request, commit_sha, dry_run)
+
+
+if __name__ == "__main__":
+    main()