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#!/bin/bash

m4_include(lib/common.sh)

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

cmd="${0##*/}"
if [[ "${cmd%%-*}" == 'multilib' ]]; then
	repo="${cmd%-build}"
	arch='x86_64'
	base_packages+=(multilib-devel)
else
	tag="${cmd%-build}"
	repo=${tag%-*}
	arch=${tag##*-}
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

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

if (( EUID )); then
	die 'This script must be run as root.'
fi

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

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

		exec 9>"$copydir.lock"
		if ! flock -n 9; then
			stat_busy "Locking chroot copy '$copy'"
			flock 9
			stat_done
		fi

		if [[ "$(stat -f -c %T "${copy}")" == btrfs ]]; then
			{ type -P btrfs && btrfs subvolume delete "${copy}"; } &>/dev/null
		fi
		rm -rf --one-file-system "${copy}"
	done
	exec 9>&-

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

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