#!/bin/bash
# License: Unspecified

m4_include(lib/common.sh)
m4_include(lib/archroot.sh)

base_packages=(base-devel)
makechrootpkg_args=(-c -n)

cmd="${0##*/}"
if [[ "${cmd%%-*}" == 'multilib' ]]; then
	repo="${cmd%-build}"
	arch='x86_64'
	arch_ext=''
	base_packages+=(multilib-devel)
else
	tag="${cmd%-build}"
	repo=${tag%-*}
	arch=${tag##*-}
	if [ "${arch}" = 'x86_64' ]; then
		arch_ext=''
	else
		arch_ext="-${arch}"
	fi
fi
chroots='/var/lib/archbuild'
clean_first=false

usage() {
	echo "Usage: $cmd [options] -- [makechrootpkg args]"
	echo '    -h         This help'
	echo '    -c         Recreate the chroot before building'
	echo '    -r <dir>   Create chroots in this directory'
	echo ''
	echo "Default makechrootpkg args: ${makechrootpkg_args[*]}"
	echo ''
	exit 1
}

while getopts 'hcr:' arg; do
	case "${arg}" in
		c) clean_first=true ;;
		r) chroots="$OPTARG" ;;
		*) usage ;;
	esac
done

check_root SOURCE_DATE_EPOCH

if [ "${arch}" = "x86_64" ]; then
	cache_dir=''
else
	mkdir -p '/var/cache/archbuild32'
	cache_dir='-c/var/cache/archbuild32'
	makechrootpkg_args+=('-d/var/cache/archbuild32:/var/cache/pacman/pkg')
fi

# Pass all arguments after -- right to makepkg
makechrootpkg_args+=("${@:$OPTIND}")

if ${clean_first} || [[ ! -d "${chroots}/${repo}-${arch}" ]]; then
	msg "Creating chroot for [%s] (%s)..." "${repo}" "${arch}"

	for copy in "${chroots}/${repo}-${arch}"/*; do
		[[ -d $copy ]] || continue
		msg2 "Deleting chroot copy '%s'..." "$(basename "${copy}")"

		lock 9 "$copy.lock" "Locking chroot copy '%s'" "$copy"

		subvolume_delete_recursive "${copy}"
		rm -rf --one-file-system "${copy}"
	done
	lock_close 9

	rm -rf --one-file-system "${chroots}/${repo}-${arch}"
	mkdir -p "${chroots}/${repo}-${arch}"
	setarch "${arch}" mkarchroot \
		-C "@pkgdatadir@/pacman-${repo}${arch_ext}.conf" \
		-M "@pkgdatadir@/makepkg-${arch}.conf" \
		${cache_dir} \
		"${chroots}/${repo}-${arch}/root" \
		"${base_packages[@]}" || abort
else
	lock 9 "${chroots}/${repo}-${arch}/root.lock" "Locking clean chroot"
	arch-nspawn \
		-C "@pkgdatadir@/pacman-${repo}${arch_ext}.conf" \
		-M "@pkgdatadir@/makepkg-${arch}.conf" \
		${cache_dir} \
		"${chroots}/${repo}-${arch}/root" \
		pacman -Syu --noconfirm || abort
fi

# Always build official packages reproducibly
if [[ ! -v SOURCE_DATE_EPOCH ]]; then
	export SOURCE_DATE_EPOCH=$(date +%s)
fi

msg "Building in chroot for [%s] (%s)..." "${repo}" "${arch}"
exec makechrootpkg -r "${chroots}/${repo}-${arch}" "${makechrootpkg_args[@]}"