Add script to rebuild PRs on Buildmaster

ci/buildmaster-rebuild-pr.py

@@ -0,0 +1,71 @@
+#!/usr/bin/env python3
+
+import argparse
+import hashlib
+import hmac
+import json
+import logging
+import os
+import uuid
+
+import requests
+
+logging.basicConfig(level=logging.DEBUG)
+
+
+def get_required_env(name):
+    value = os.environ.get(name)
+    if not value:
+        raise ValueError(f'Expected environment variable {name!r} to be non-empty')
+    return value
+
+
+def make_sig(body, secret, algorithm):
+    return hmac.new(secret.encode(), body.encode(), algorithm).hexdigest()
+
+
+webhook_url = get_required_env('DFHACK_BUILDMASTER_WEBHOOK_URL')
+secret = get_required_env('DFHACK_BUILDMASTER_WEBHOOK_SECRET')
+api_token = get_required_env('GITHUB_TOKEN')
+repo = get_required_env('GITHUB_REPO')
+
+
+parser = argparse.ArgumentParser()
+target_group = parser.add_mutually_exclusive_group(required=True)
+target_group.add_argument('--pull-request', type=int, help='Pull request to rebuild')
+args = parser.parse_args()
+
+
+response = requests.get(
+    f'https://api.github.com/repos/{repo}/pulls/{args.pull_request}',
+    headers={
+        'Authorization': f'Bearer {api_token}',
+    },
+)
+response.raise_for_status()
+pull_request_data = response.json()
+
+
+body = json.dumps({
+    'action': 'synchronize',
+    'number': args.pull_request,
+    'pull_request': pull_request_data,
+})
+
+response = requests.post(
+    'https://lubar-webhook-proxy.appspot.com/github/buildmaster',
+    headers={
+        'Content-Type': 'application/json',
+        'User-Agent': 'GitHub-Hookshot/' + requests.utils.default_user_agent(),
+        'X-GitHub-Delivery': 'dfhack-rebuild-' + str(uuid.uuid4()),
+        'X-GitHub-Event': 'pull_request',
+        'X-Hub-Signature': 'sha1=' + make_sig(body, secret, hashlib.sha1),
+        'X-Hub-Signature-256': 'sha256=' + make_sig(body, secret, hashlib.sha256),
+    },
+    data=body,
+    timeout=15,
+)
+
+print(response)
+print(str(response.text))
+response.raise_for_status()