add the code

pre_commit_hooks/no_commit_to_branch.py

@@ -0,0 +1,24 @@
+from __future__ import print_function
+
+import argparse
+import sys
+
+import util
+
+
+def main(argv=None):
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-b', default='master', help='branch to disallow commits to')
+    parser.add_argument('filenames', nargs='*', help='filenames to check.')
+    args = parser.parse_args(argv)
+
+    retval = -1
+    branch = util.cmd_output('git', 'symbolic-ref', 'HEAD')
+    chunks = branch.split('/')
+    if chunks[2] == args.b:
+        retval = 0
+    return retval
+
+
+if __name__ == '__main__':
+    sys.exit(main())