--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/checker.py	Mon Jun 13 09:47:55 2016 +0800
@@ -0,0 +1,80 @@
+#!/usr/bin/env python -u
+from __future__ import print_function
+
+import os
+from argparse import ArgumentParser, FileType
+from datetime import datetime
+from shutil import rmtree
+from subprocess import check_call, CalledProcessError
+from tempfile import mkdtemp
+
+import yaml
+
+
+rel = lambda *x: os.path.abspath(os.path.join(os.path.dirname(__file__), *x))
+
+
+def print_and_run(args):
+    print('$ ' + ' '.join(args))
+    check_call(args)
+
+
+def run_ignore_1(fn, args):
+    try:
+        fn(args)
+    except CalledProcessError as e:
+        if e.returncode == 1:
+            pass
+
+
+def run(args, silent=False, ignore_1=False):
+    if silent:
+        fn = check_call
+    else:
+        fn = print_and_run
+    try:
+        if ignore_1:
+            run_ignore_1(fn, args)
+        else:
+            fn(args)
+        return True
+    except Exception as e:
+        print('# C&O error: {}'.format(e))
+        print('# C&O job failed')
+        return False
+
+
+def now():
+    return datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S+00:00')
+
+
+def execute(config):
+    ok = True
+
+    print('# C&O job started: {}'.format(now()))
+    tmp = mkdtemp(prefix='candolint.', dir=rel('workdir'))
+    os.chdir(tmp)
+
+    print('# C&O task: clone')
+    print('# C&O project URL: {}'.format(config['url']))
+    source = './source'
+
+    if ok and not run(['hg', 'clone', config['url'], source]):
+        ok = False
+
+    print('# C&O task: cleanup')
+    rmtree(tmp)
+
+    print('# C&O job finished: {}'.format(now()))
+
+
+def main():
+    parser = ArgumentParser()
+    parser.add_argument('config', help='configuration file (YAML)', type=FileType('r'))
+    args = parser.parse_args()
+    config = yaml.safe_load(args.config)
+    execute(config)
+
+
+if __name__ == '__main__':
+    main()

--- a/requirements.txt	Sun Jun 12 22:28:31 2016 +0800
+++ b/requirements.txt	Mon Jun 13 09:47:55 2016 +0800
@@ -1,1 +1,2 @@
 peewee==2.8.1
+PyYAML==3.11