live-build/frontend/lb

#!/bin/sh

## live-build(7) - System Build Scripts
## Copyright (C) 2006-2015 Daniel Baumann <mail@daniel-baumann.ch>
##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


set -e

# Including common functions
[ -e "${LIVE_BUILD}/scripts/build.sh" ] && . "${LIVE_BUILD}/scripts/build.sh" || . /usr/lib/live/build.sh

# Setting static variables
DESCRIPTION="Utility to build live systems"
HELP=""
USAGE="lb {clean|config|build}"

case "${1}" in
	-h|--help)
		if [ $(which man) ]
		then
			man lb
			exit 0
		else
			${0} --usage
			exit 0
		fi
		;;

	""|-u|--usage)
		Usage
		;;

	-v|--version)
		echo "${VERSION}"
		exit 0
		;;

	*)
		COMMAND="${1}"
		shift

		ENV=""

		if [ "${COMMAND}" != "config" ]
		then
			# Checking user account
			if [ "$(id -u)" -ne "0" ]
			then
				Echo_error "Root privileges needed!"
				exit 1
			fi
		fi

		for _FILE in config/environment config/environment.binary
		do
			if [ -e "${_FILE}" ]
			then
				ENV="${ENV} $(grep -v '^#' ${_FILE})"
			fi
		done

		if [ -x "${LIVE_BUILD}/scripts/build/${COMMAND}" ]
		then
			# User has live-build copied locally in the system
			SCRIPT="${LIVE_BUILD}/scripts/build/${COMMAND}"
		elif [ -x "local/live-build/scripts/build/${COMMAND}" ]
		then
			# User has live-build copied locally in the config
			SCRIPT="local/live-build/scripts/build/${COMMAND}"
		elif [ -x /usr/lib/live/build/${COMMAND} ]
		then
			# User has live-build installed in the system
			SCRIPT=/usr/lib/live/build/"${COMMAND}"
		elif [ $(which "${COMMAND}") ]
		then
			# User has live-build commands in path
			SCRIPT="${COMMAND}"
		else
			Echo_error "No such script: ${COMMAND}"
			exit 1
		fi

		Echo "[%s] %s" "$(date +'%F %T')" "lb ${COMMAND} $(echo ${@})"
		${ENV} exec "${SCRIPT}" "${@}"
		;;
esac