#!/bin/bash
# $Id$
#
# rebuilds /etc/{ld.so.conf,profile.env} with given files from /etc/env.d
#

SPECIALVARS="KDEDIRS PATH CLASSPATH LDPATH MANPATH INFODIR INFOPATH ROOTPATH"
SPECIALVARS+=" CONFIG_PROTECT CONFIG_PROTECT_MASK CONFIG_PROTECT_IGNORE"
SPECIALVARS+=" PRELINK_PATH PRELINK_PATH_MASK"
SPECIALVARS+=" OMF_DIR LIBGL_DRIVERS_PATH XDG_CONFIG_DIRS XDG_DATA_DIRS"

# secure tmp dir
if [ -x /bin/mktemp ]
then
	TMPDIR="$(/bin/mktemp -d -p /var/tmp)"
else
	TMPDIR="/var/tmp/tmp.$$"
	install -d ${TMPDIR}
fi

echo -en "\n>>>> Rebuilding environment... "

# clean existing conf files
:> ${MROOT}/etc/ld.so.conf
:> ${MROOT}/etc/profile.env

# read everything from /etc/env.d
for file in ${MROOT}/etc/env.d/*
do
	# abort if "empty"
	[[ ${file} = ${MROOT}/etc/env.d/\* ]] && continue

	# reads content of every file
	while read line
	do
		# ignore if empty or a comment
		case "${line}" in
			\#*|"") continue ;;
		esac

		variable="${line%%=*}"
		value="${line##*=}"

		# substitudes " or ' from $value if exists
		value="${value//\"}"	#}" <--- make code readable again :)
		value="${value//\'}"

		# writes LDPATH to ${MROOT}/etc/ld.so.conf,
		# anything else to ${MROOT}/etc/profile.env
		if [[ ${variable} = LDPATH ]]
		then
			echo "${value}" >> ${MROOT}/etc/ld.so.conf
		else
			# checks if var exists in specialvars
			for i in ${SPECIALVARS}
			do
				[[ ${variable} = ${i} ]] && SPECVAR="yes"
			done

			if [[ ${SPECVAR} = yes ]]
			then
				case ${variable} in
					CONFIG_PROTECT*)
						# CONFIG_PROTECT** have as delimiter  not ':'  but ' '
						echo -n "${value} " >> ${TMPDIR}/${variable}
						unset SPECVAR
						;;
					*)
						# special vars are written to tmpfile
						# to substitude them to one variable
						echo -n "${value}:" >> ${TMPDIR}/${variable}
						unset SPECVAR
						;;
				esac
			else
				# all other vars go directly to /etc/profile.env
				echo "export ${line}" >> ${MROOT}/etc/profile.env
			fi
		fi
	done << EOF
$(cat ${file})
EOF

done

# reads special vars tmp files and writes them to /etc/profile.env
for variable in ${SPECIALVARS}
do
	if [ -f ${TMPDIR}/${variable} ]
	then
		# only OMF_DIR goes to /etc/scrollkeeper.conf
		if [[ ${variable} = OMF_DIR ]]
		then
			echo "${variable}=$(< ${TMPDIR}/${variable})" > ${MROOT}/etc/scrollkeeper.conf
		else
			echo "export ${variable}=\"$(< ${TMPDIR}/${variable})\"" >> ${MROOT}/etc/profile.env
		fi
		rm ${TMPDIR}/${variable}
	fi
done

# rebuilds environment
ldconfig -r "${MROOT}" -f /etc/ld.so.conf -C /etc/ld.so.cache
[ -f ${MROOT}/etc/profile ] && source ${MROOT}/etc/profile

# cleanups
[ -d ${TMPDIR} ] && rm -rf ${TMPDIR}

echo -e "done.\n"