/github.com/hooks/pre-commit.sample

 1#!/bin/sh
 2#
 3# An example hook script to verify what is about to be committed.
 4# Called by git-commit with no arguments.  The hook should
 5# exit with non-zero status after issuing an appropriate message if
 6# it wants to stop the commit.
 7#
 8# To enable this hook, rename this file to "pre-commit".
 9
10if git-rev-parse --verify HEAD 2>/dev/null
11then
12	against=HEAD
13else
14	# Initial commit: diff against an empty tree object
15	against=4b825dc642cb6eb9a060e54bf8d69288fbee4904
16fi
17
18exec git diff-index --check --cached $against --