# one time jobs

# determine packet manager:
if [ ! -z "$(which apt-get)" ]; then
	PACKET_MANAGER="apt"
elif [ ! -z "$(which zypper)" ]; then
	PACKET_MANAGER="zypper"
else
	perror "Could not determine this platform's packet manager"
fi

#

# copy list of files using tar
tarcopy () {
	[ $# -ne 2 ] && perror "Sanity check failed: tarcopy needs exactly two params, but $# were given."
	local FROM=$(trim "$1")
	local TO=$(trim "$2")
	if [ -z "$FROM" ]; then
		pwarning "tarcopy called with empty input list (dest was '$TO')"
		return
	fi
	local SHORT=$FROM
	[ ${#SHORT} -gt 23 ] && SHORT=$(echo "$SHORT" | cut -c-18)...$(echo "$SHORT" | cut -c$[${#SHORT} - 4]-)
	[ -z "$TO" ] && perror "tarcopy called with empty destination."
	tar -cp $FROM | tar -xp -C "$TO"
	local PS=(${PIPESTATUS[*]})
	[ "x${PS[0]}" != "x0" ] && perror "packing-part of tar-copy from '$SHORT' to '$TO' failed. (${PS[0]})"
	[ "x${PS[1]}" != "x0" ] && perror "unpacking-part of tar-copy from '$SHORT' to '$TO' failed. (${PS[1]})"
}

# get all files of required packages by a module
list_packet_files() {
	[ -z "$REQUIRED_PACKAGES" ] && return
	for PACKAGE in $REQUIRED_PACKAGES; do
		local FILES=""
		if [ "$PACKET_MANAGER" = "apt" ]; then
			FILES="$(dpkg -L "$PACKAGE" | grep -v share/doc | grep -v share/man; echo ":###:${PIPESTATUS[0]}")"
		elif [ "$PACKET_MANAGER" = "zypper" ]; then
			FILES="$(rpm -ql "$PACKAGE" | grep -v share/doc | grep -v share/man; echo ":###:${PIPESTATUS[0]}")"
		fi
		# ugly hack to get our return value
		#local LPRET=$(echo "$FILES" | tail -1 | sed 's/^.*:###:\([0-9]*\)$/\1/g')
		#FILES=$(echo "$FILES" | sed 's/^\(.*\):###:[0-9]*$/\1/g')
		local LPRET=$(echo "$FILES" | awk -F ':###:' '{printf $2}')
		FILES=$(echo "$FILES" | awk -F ':###:' '{print $1}')
		[ "x$LPRET" != "x0" ] && perror "list_packet_files exited with code '$LPRET' for packet ${PACKAGE}."
		[ -z "$FILES" ] && perror "list_packet_files empty for packet ${PACKAGE}."
		for FILE in $FILES; do
			[ ! -d "$FILE" ] && echo "$FILE"
		done
	done
}

# install all dependencies of a module
install_dependencies() {
	[ -z "$REQUIRED_DEPENDENCIES" ] && return
	if [ "$PACKET_MANAGER" = "apt" ]; then
		apt-get install -y $REQUIRED_DEPENDENCIES || perror "Could not apt-get install $REQUIRED_DEPENDENCIES"
	elif [ "$PACKET_MANAGER" = "zypper" ]; then
		zypper install -y $REQUIRED_DEPENDENCIES || perror "Could not zypper install $REQUIRED_DEPENDENCIES"
	fi
}

# generate initramfs of directory
generate_initramfs() {
	[ $# -ne 2 ] && perror "Sanity check failed: generate_initramfs needs exactly two params, but $# were given."
        cd "$2" || perror "Cannot cd to '$2'"
        find . | cpio --format="newc" --create | gzip -9 > "${MODULE_DIR}/$1"
        local PS=(${PIPESTATUS[*]})
        [ "x${PS[0]}" != "x0" ] && perror "'find .' in '$(pwd)' failed."
        [ "x${PS[1]}" != "x0" ] && perror "cpio create failed."
        [ "x${PS[2]}" != "x0" ] && perror "gzip to '${MODULE_DIR}/$1' failed."
        cd -
        pinfo "initramfs of $2 created at ${MODULE_DIR}/$1"
}