#!/sbin/runscript
# Copyright 1999-2008 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2

description="Maintain a tarball of not udev managed device nodes"
[ -e /etc/conf.d/udev ] && . /etc/conf.d/udev

rc_device_tarball=${rc_device_tarball:-${RC_DEVICE_TARBALL:-NO}}
device_tarball=/lib/udev/state/devices.tar.bz2

depend() {
	if [ -f /etc/init.d/sysfs ]; then
		need udev-mount
	fi
}

start()
{
	_start
}

_start() {
	if yesno "${rc_device_tarball}" && \
		[ -s "${device_tarball}" ]
	then
		ebegin "Populating /dev with saved device nodes"
		tar -jxpf "${device_tarball}" -C /dev
		eend $?
	fi
}

stop() {
	if [ -e /dev/.devfsd ] || [ ! -e /dev/.udev ] || [ ! -z "${CDBOOT}" ] || \
		! yesno "${rc_device_tarball}" || \
		! touch "${device_tarball}" 2>/dev/null
	then
		return 0
	fi

	ebegin "Saving device nodes"
	# Handle our temp files
	save_tmp_base=/tmp/udev.savedevices."$$"
	devices_udev="${save_tmp_base}"/devices.udev
	devices_real="${save_tmp_base}"/devices.real
	devices_totar="${save_tmp_base}"/devices.totar
	device_tmp_tarball="${save_tmp_base}"/devices

	rm -rf "${save_tmp_base}"
	mkdir "${save_tmp_base}"
	touch "${devices_udev}" "${devices_real}" \
		"${devices_totar}" "${device_tmp_tarball}"

	if [ -f "${devices_udev}" -a -f "${devices_real}" -a \
		-f "${devices_totar}" -a -f "${device_tmp_tarball}" ]
	then
		cd /dev
		# Find all devices, but ignore .udev directory
		find . -xdev -type b -or -type c -or -type l | \
		cut -d/ -f2- | \
		grep -v ^\\.udev >"${devices_real}"

		# Figure out what udev created
		udevadm info --export-db | sed -ne 's,^[SN]: \(.*\),\1,p' >"${devices_udev}"
		# These ones we also do not want in there
		for x in MAKEDEV core fd initctl pts shm stderr stdin stdout root; do
			echo "${x}" >> "${devices_udev}"
		done
		if [ -d /lib/udev/devices ]; then
			cd /lib/udev/devices
			find . -xdev -type b -or -type c -or -type l | \
			cut -d/ -f2- >> "${devices_udev}"
			cd /dev
		fi

		fgrep -x -v -f "${devices_udev}" "${devices_real}" > "${devices_totar}"

		# Now only tarball those not created by udev if we have any
		if [ -s "${devices_totar}" ]; then
			# we dont want to descend into mounted filesystems (e.g. devpts)
			# looking up username may involve NIS/network
			# and net may be down
			tar --one-file-system --numeric-owner \
				-jcpf "${device_tmp_tarball}" -T "${devices_totar}"
			mv -f "${device_tmp_tarball}" "${device_tarball}"
		else
			rm -f "${device_tarball}"
		fi
		eend 0
	else
		eend 1 "Could not create temporary files!"
	fi

	rm -rf "${save_tmp_base}"
}