1#!/bin/sh
2#
3# An example hook script to check the commit log message.
4# Called by "git commit" with one argument, the name of the file
5# that has the commit message.  The hook should exit with non-zero
6# status after issuing an appropriate message if it wants to stop the
7# commit.  The hook is allowed to edit the commit message file.
8#
9# To enable this hook, rename this file to "commit-msg".
10
11# Uncomment the below to add a Signed-off-by line to the message.
12# Doing this in a hook is a bad idea in general, but the prepare-commit-msg
13# hook is more suited to it.
14#
15# SOB=$(git var GIT_AUTHOR_IDENT | sed -n 's/^\(.*>\).*$/Signed-off-by: \1/p')
16# grep -qs "^$SOB" "$1" || echo "$SOB" >> "$1"
17
18# This example catches duplicate Signed-off-by lines.
19
20test "" = "$(grep '^Signed-off-by: ' "$1" |
21	 sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d')" || {
22	echo >&2 Duplicate Signed-off-by lines.
23	exit 1
24}
25