stack/monitor: Add promise runner script

This script reuses the promise launcher from slapos.core to launch the
instance promises using the python executable installed by the SR.

stack/monitor/buildout.cfg

@@ -41,6 +41,68 @@ eggs =
   Jinja2
 depends =
   ${slapos-toolbox:recipe}
+promises-need-this-script-in-path =
+  ${runpromise:recipe}
+
+[runpromise]
+recipe = zc.recipe.egg
+eggs =
+  slapos.core
+scripts = ${:_buildout_section_name_}
+entry-points =
+  ${:scripts}=never_used:never_called
+initialization =
+  import argparse
+
+  from slapos.grid.promise import PromiseLauncher
+  from slapos.cli.entry import SlapOSApp
+
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--promise-folder', required=True)
+  parser.add_argument('--legacy-promise-folder', required=True)
+  parser.add_argument('--promise-timeout', type=int, required=True)
+  parser.add_argument('--uid', type=int, required=True)
+  parser.add_argument('--gid', type=int, required=True)
+  parser.add_argument('--partition-folder', required=True)
+  parser.add_argument('--log-folder', required=True)
+  parser.add_argument('--force', type=int, required=True)
+  parser.add_argument('--check-anomaly', type=int, required=True)
+  parser.add_argument('--master-url', required=True)
+  parser.add_argument('--partition-cert', required=True)
+  parser.add_argument('--partition-key', required=True)
+  parser.add_argument('--partition-id', required=True)
+  parser.add_argument('--computer-id', required=True)
+  args = parser.parse_args()
+
+  promise_config = {
+    'promise-folder': args.promise_folder,
+    'legacy-promise-folder': args.legacy_promise_folder,
+    'promise-timeout': args.promise_timeout,
+    'uid': args.uid,
+    'gid': args.gid,
+    'partition-folder': args.partition_folder,
+    'log-folder': args.log_folder,
+    'force': bool(args.force),
+    'check-anomaly': bool(args.check_anomaly),
+    'master-url': args.master_url,
+    'partition-cert': args.partition_cert,
+    'partition-key': args.partition_key,
+    'partition-id': args.partition_id,
+    'computer-id': args.computer_id,
+  }
+
+  # Get the same logger as a standard slapos command
+  app = SlapOSApp()
+  app.options, _ = app.parser.parse_known_args([])
+  app.configure_logging()
+  logger = app.log
+
+  try:
+    promise_checker = PromiseLauncher(config=promise_config, logger=logger)
+    promise_checker.run()
+  except Exception:
+    sys.exit(1)
+  sys.exit(0)
 
 
 # Monitor templates files