#!/bin/sh

set -e

NCPUS=$(sysctl hw.ncpufound | sed 's/.*=//')

# Try to find a valid way to become root if not already
SUDO=
if [ -e '/etc/doas.conf' ]; then
	SUDO='/usr/bin/doas'
elif [ -x '/usr/local/bin/sudo' ]; then
	SUDO='/usr/local/bin/sudo'
fi

# Bail out if not root and neither sudo or doas was found.
_uid=$(id -u)
if [ -z ${SUDO} -a \( ${_uid} -ne 0 \) ]; then
	echo 'Need a way to become root, neither sudo or doas found...' 1>&2
	exit 1
elif [ ${_uid} -eq 0 ]; then
	# Clear SUDO if already root
	SUDO=
fi

# Find the source tree for the base system
if [ -e /etc/mk.conf ]; then
	BSDSRCDIR=$(make -f /etc/mk.conf -V BSDSRCDIR)
	BSDOBJDIR=$(make -f /etc/mk.conf -V BSDOBJDIR)
fi
BSDSRCDIR=${BSDSRCDIR:=/usr/src}
BSDOBJDIR=${BSDOBJDIR:=/usr/obj}

START_TIME=$(date)
cd ${BSDOBJDIR} && mkdir -p .old && ${SUDO} mv * .old && ${SUDO} rm -rf .old &
cd ${BSDSRCDIR} && make obj
cd ${BSDSRCDIR}/etc && ${SUDO} make DESTDIR=/ distrib-dirs
cd ${BSDSRCDIR}
make SUDO=${SUDO} build -j $((NCPUS * 2))
RESULT=$?
END_TIME=$(date)
echo "Build started at ${START_TIME}, ended at ${END_TIME}"
exit ${RESULT}