git/templates/hooks--commit-msg

#!/bin/sh
#
# An example hook script to check the commit log message.
# Called by git-commit-script 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, make this file executable.

# This example catches duplicate Signed-off-by lines.

test "" = "$(grep '^Signed-off-by: ' "$1" |
	 sort | uniq -c | sed -e '/^[ 	]*1 /d')"
Add commit hook and make the verification customizable. There are three hooks: - 'pre-commit' is given an opportunity to inspect what is being committed, before we invoke the EDITOR for the commit message; - 'commit-msg' is invoked on the commit log message after the user prepares it; - 'post-commit' is run after a successful commit is made. The first two can interfere to stop the commit. The last one is for after-the-fact notification. The earlier built-in commit checker is now moved to pre-commit. Signed-off-by: Junio C Hamano <junkio@cox.net> 20 years ago			`#!/bin/sh`
			`#`
			`# An example hook script to check the commit log message.`
			`# Called by git-commit-script 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, make this file executable.`

			`# This example catches duplicate Signed-off-by lines.`

			`test "" = "$(grep '^Signed-off-by: ' "$1" \|`
			`sort \| uniq -c \| sed -e '/^[ ]*1 /d')"`