DEPENDS=$(cat_file_merge "ROOTFS" | sort -u)

build() {
	local SOURCE="$1"
	local DEPLOY="$2"

	# setup skeleton
	mkdir -pv ${PKGBUILDDIR}/{bin,lib,etc,dev,sys,proc,tmp,var,run}
	mkdir -pv ${PKGBUILDDIR}/{boot,usr,mnt}
	mkdir -pv ${PKGBUILDDIR}/cfg/{preserve,overlay}

	cp -r "$SCRIPTDIR/pkg/$PKGNAME/etc" "$PKGBUILDDIR"
	cp -r "$SCRIPTDIR/pkg/$PKGNAME/lib" "$PKGBUILDDIR"

	# install packages to rootfs
	dependencies | tsort | tac | \
		grep -v "$PKGNAME" > "$PKGBUILDDIR/etc/packages"

	while read pkgname; do
		if [ ! -e "$PKGDEPLOYDIR/$pkgname" ]; then
			continue
		fi

		cp -ru --remove-destination ${PKGDEPLOYDIR}/${pkgname}/* \
			"$PKGBUILDDIR"
	done < "$PKGBUILDDIR/etc/packages"

	# version info
	local fname=$(echo "${OS_NAME}-release" | tr '[:upper:]' '[:lower:]')

	echo $OS_RELEASE > $PKGBUILDDIR/etc/$fname

	# setup root home directory
	mkdir -p "$PKGBUILDDIR/cfg/preserve/usr"

	cp -r "$PKGBUILDDIR/etc/skel" "$PKGBUILDDIR/cfg/preserve/usr/root"
	chmod 750 "$PKGBUILDDIR/cfg/preserve/usr/root"

	# move configuration to preserve directory
	mv "$PKGBUILDDIR/etc" "$PKGBUILDDIR/cfg/preserve"
	mv "$PKGBUILDDIR/var/lib" "$PKGBUILDDIR/cfg/preserve/var_lib"
	rm -rf "$PKGBUILDDIR/var"

	mkdir -p ${PKGBUILDDIR}/{etc,var}
}

deploy() {
	local SOURCE="$1"
	local DEPLOY="$2"

	mksquashfs "$PKGBUILDDIR" "$DEPLOY/rootfs.img" -comp xz \
		-all-root -no-progress -no-xattrs
}