#!/bin/bash

base_packages=(base base-devel sudo)

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

usage() {
	echo "usage $(basename "$0")"
	echo '    -c         Recreate the chroot before building'
	echo '    -r <dir>   Create chroots in this directory'
	exit 1
}

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

if [[ "$EUID" != '0' ]]; then
	echo 'This script must be run as root.'
	exit 1
fi

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

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

		# Lock the copy
		exec 9>"${copy}.lock"
		flock 9

		{ type -P btrfs && btrfs subvolume delete "${copy}"; } &>/dev/null
		rm -rf "${copy}"
	done
	exec 9>&-

	rm -rf "${chroots}/${repo}-${arch}"
	mkdir -p "${chroots}/${repo}-${arch}"
	setarch "${arch}" mkarchroot \
		-C "/usr/share/devtools/pacman-${repo}.conf" \
		-M "/usr/share/devtools/makepkg-${arch}.conf" \
		"${chroots}/${repo}-${arch}/root" \
		"${base_packages[@]}"
else
	setarch ${arch} mkarchroot \
		-u \
		"${chroots}/${repo}-${arch}/root"
fi

echo "Building in chroot for [${repo}] (${arch})..."
setarch "${arch}" makechrootpkg -c -r "${chroots}/${repo}-${arch}"