#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
#
# git-request-pull wrapper with sanity checks
#

baserev=
headrev=

parse_options() {
	# The code below if borrowed from git-request-pull

	# Skip all options
	while [[ $# != 0 ]] ; do
		case "$1" in
		-p)
			;;
		--)
			shift
			break
			;;
		-*)
			return
			;;
		*)
			break
			;;
		esac
		shift
	done

	local base=$1
	local head=

	baserev=$(git rev-parse --verify --quiet "$base"^0)
	if [[ -z "$baserev" ]] ; then
		return
	fi

	local=${3%:*}
	local=${local:-HEAD}
	head=$(git symbolic-ref -q "$local")
	head=${head:-$(git show-ref --heads --tags "$local" | cut -d' ' -f2)}
	head=${head:-$(git rev-parse --quiet --verify "$local")}

	if [[ -z "$head" ]] ; then
		return
	fi

	headrev=$(git rev-parse --verify --quiet "$head"^0)
}

check_commits() {
	if [[ -z "$baserev" || -z "$headrev" ]] ; then
		# git request-pull will catch this issue
		return
	fi

	local author
	local commit
	local committer
	local errors=0
	local sob

	for commit in $(git rev-list ^$baserev $headrev) ; do
		local author=$(git show --pretty='format:%an <%ae>' -s $commit)
		local committer=$(git show --pretty='format:%cn <%ce>' -s $commit)
		local summary=$(git show --pretty='format:%h ("%s")' -s $commit)

		git show -s $commit | grep -Fqx "    Signed-off-by: $author" || {
			echo "Commit $summary is not signed off by author"
			errors=$((errors+1))
		}
		git show -s $commit | grep -Fqx "    Signed-off-by: $committer" || {
			echo "Commit $summary is not signed off by committer"
			errors=$((errors+1))
		}
	done

	if [[ $errors != 0 ]] ; then
		echo "$errors errors found, please fix"
		exit 1
	fi
}

parse_options $*
check_commits

git request-pull $*