#!/bin/sh
#
# Copyright (c) 2026 The NetBSD Foundation, Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#

#
# pre-receive
#
#	This git hook is run by git-receive-pack(1) before applying
#	updates from a client running `git push', once per push.  The
#	refs being updated are fed to this hook on standard input, one
#	per LF-terminated line, of the form:
#
#		<old-value> SP <new-value> SP <ref> LF
#
#	If this hook fails, the entire push fails and has no effect.
#
#	See the githooks(5) man page for details.
#
# WHAT THIS HOOK IMPLEMENTATION DOES
#
#	Nothing for now.  For the hg<->git bridge, the `update' hook is
#	more convenient for obscure technical reasons; see
#	https://lore.kernel.org/git/20241105013433.4E52260A64@jupiter.mumble.net/T/
#	for related discussion.
#
#	XXX Should explain exactly why `update' works but `pre-receive'
#	does not -- something to do with locking and/or quarantine
#	environment.
#

DEBUG=$(git config --type bool --default false netbsd.debug)
if $DEBUG; then
	echo BEGIN pre-receive $$
	trap 'echo END pre-receive $$' EXIT HUP INT TERM
fi

set -Ceu
if $DEBUG; then
	set -x
fi

if $DEBUG; then
	i=0
	while [ "$i" -lt "${GIT_PUSH_OPTION_COUNT:-0}" ]; do
		eval echo [pre-receive] GIT_PUSH_OPTION_$i=\$GIT_PUSH_OPTION_$i
		i=$((i + 1))
	done
fi

if $DEBUG; then
	awk '{ print "[pre-receive]", $0 }'
fi
