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