scripts/commit-msg

#!/usr/bin/env bash

# Copyright (c) Microsoft Corporation
# SPDX-License-Identifier: Apache-2.0

set -o errexit

exit_() {
    echo ""
    echo "$1"
    echo ""
    echo "This hook can be skipped if needed with 'git commit --no-verify'"
    echo "See '.git/hooks/commit-msg., installed from 'scripts/commit-msg'"
    exit 1
}

sign_offs="$(grep '^Signed-off-by: ' "$1" || test $? = 1 )"

if [[ -z $sign_offs ]]; then
    exit_ "Commit failed: please sign-off on the DCO with 'git commit -s'"
fi

if [[ -n $(echo "$sign_offs" | sort | uniq -c | sed -e '/^[ 	]*1[ 	]/d') ]]; then
    exit_ "Commit failed: please remove duplicate Signed-off-by lines"
fi