#!/sbin/runscript
# Copyright 1999-2010 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

opts="dump"
description="Backup and restore /var/run directory structure (useful for systems with tmpfs-based /var/run)"
description_dump="Creates a backup tarball of /var/run directory structure"

[ -e /etc/conf.d/varrun ] && . /etc/conf.d/varrun

rc_varrun_tarball="${rc_varrun_tarball:-${RC_VARRUN_TARBALL:-NO}}"
rc_varrun_exclude="${rc_varrun_exclude}"
varrun_tarball="/var/cache/varrun.tar.bz2"

depend() {
		need localmount
}

start() {
	if yesno "${rc_varrun_tarball}" && \
		[ -s "${varrun_tarball}" ]
	then
		ebegin "Restoring saved /var/run structure"
		echo
#		tar -jxpf "${varrun_tarball}" -C /var/run
		eend $?
	fi
}

_stop() {
	if ! yesno "${rc_varrun_tarball}" || \
		! touch "${varrun_tarball}" 2>/dev/null
	then
		return 0
	fi

	ebegin "Saving /var/run structure"
	# Handle our temp files
	save_varrun_base=/tmp/varrun.savedirs."$$"
	varrun_tmp_tarball="${save_varrun_base}"/varrun
	dirs_exclude="${save_varrun_base}"/dirs.exclude
	dirs_tosave="${save_varrun_base}"/dirs.tosave
	dirs_totar="${save_varrun_base}"/dirs.totar
	files_notar="${save_varrun_base}"/files.notar

	rm -rf "${save_varrun_base}"
	mkdir "${save_varrun_base}"
	touch "${varrun_tmp_tarball}" "${dirs_exclude}" "${dirs_tosave}" "${dirs_totar}" "${files_notar}"

	if [ -f "${varrun_tmp_tarball}" -a -f "${dirs_exclude}" -a \
		-f "${dirs_tosave}" -a -f "${dirs_totar}" -a -f "${files_notar}" ]
	then
		cd /var/run
		# We don't want to save some dirs
                # You can add to this list via rc_varrun_exclude variable in /etc/conf.d/varrun
                # All subdirectories of listed directories will be excluded as well
                if [ -n "${rc_varrun_exclude}" ]
                then
            		    for x in ${rc_varrun_exclude} ; do
            			ls -d1 /var/run/"${x}" | sed -e "s:/var/run/::" >> "${dirs_exclude}"
            			ls -d1 /var/run/"${x}"/* | sed -e "s:/var/run/::" >> "${dirs_exclude}"
            		    done
            	fi
		# We don't want to save any files (PIDs), sockets, pipes etc., only the directory structure
            	cd /var/run
		find . -xdev -type f -or -type b -or -type c -or -type p -or -type s | \
			cut -d/ -f2- >> "${files_notar}"

		# Now stuff that we want to save
		find . -xdev -type d | cut -d/ -f2- | grep -v ^\\. > "${dirs_tosave}"
		fgrep -x -v -f "${dirs_exclude}" "${dirs_tosave}" > "${dirs_totar}"

		# Lets pack it up
		if [ -s "${dirs_totar}" ]
		then
			# we dont want to descend into mounted filesystems
			# looking up username may involve NIS/network
			# and net may be down
			tar --one-file-system --numeric-owner \
				-jcpf "${varrun_tmp_tarball}" -T "${dirs_totar}" -X "${files_notar}"
			mv -f "${varrun_tmp_tarball}" "${varrun_tarball}"
		else
			rm -f "${varrun_tarball}"
		fi
		eend 0
	else
		eend 1 "Could not save temporary files!"
	fi

	rm -rf "${save_varrun_base}"
}

stop() {
	_stop
}

dump() {
	_stop
}