From 183e20528865eaf12c80d5899a6bf64b048d009a Mon Sep 17 00:00:00 2001
From: Edgar Geier <egeier@rhrk.uni-kl.de>
Date: Mon, 22 Jul 2019 21:13:28 +0200
Subject: [PATCH] Check --config option is a path to a regular file

---
 pre_commit/main.py | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/pre_commit/main.py b/pre_commit/main.py
index 67a67a05..9f18210b 100644
--- a/pre_commit/main.py
+++ b/pre_commit/main.py
@@ -36,6 +36,17 @@ logger = logging.getLogger('pre_commit')
 os.environ.pop('__PYVENV_LAUNCHER__', None)
 
 
+def _file_path(path):
+    if os.path.isfile(path):
+        return path
+    elif os.path.exists(path):
+        msg = '{} is not a regular file'.format(path)
+        raise argparse.ArgumentTypeError(msg)
+    else:
+        msg = '{} does not exist'.format(path)
+        raise argparse.ArgumentTypeError(msg)
+
+
 def _add_color_option(parser):
     parser.add_argument(
         '--color', default='auto', type=color.use_color,
@@ -48,6 +59,7 @@ def _add_config_option(parser):
     parser.add_argument(
         '-c', '--config', default=C.CONFIG_FILE,
         help='Path to alternate config file',
+        type=_file_path,
     )