Refactor the way that git executables are launched in depot tools.

git-cl

Index: git-cl
diff --git a/git-cl b/git-cl
index 8032f98377a22e9b515695d17b128b02c01cd2e0..7b17d25bee415ca610d6b23fe5034900cf046ef9 100755
--- a/git-cl
+++ b/git-cl
@@ -1,27 +1,9 @@
-#!/bin/sh
-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+#!/bin/bash
+# Copyright (c) 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-# git-cl -- a git-command for integrating reviews on Rietveld
+# git_cl.py -- a git-command for integrating reviews on Rietveld
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
-# Test if this script is running under a MSys install.  If it is, we will
-# hardcode the path to Python where possible.
-OUTPUT="$(uname | grep 'MINGW')"
-MINGW=$?
-
-if [ $MINGW = 0 ]; then
-  base_dir="${0%\\*}"
-else
-  base_dir=$(dirname "$0")
-fi
-
-# Uncomment this line if you never use gclient.
-# "$base_dir"/update_depot_tools
-
-if [ -e "$base_dir/python.bat" -a $MINGW = 0 ]; then
-  PYTHONDONTWRITEBYTECODE=1 cmd.exe //c "$base_dir\\python.bat" "$base_dir\\git_cl.py" "$@"
-else
-  PYTHONDONTWRITEBYTECODE=1 exec "$base_dir/git_cl.py" "$@"
-fi
+. $(type -P python_git_runner.sh)