openrc/init.d/checkroot

#!/sbin/runscript
# Copyright 1999-2007 Gentoo Foundation
# Copyright 2007 Roy Marples
# All rights reserved

# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.

description="Check the root filesystem according to /etc/fstab for errors \
and optionally repair them."

do_mtab() {
	# Don't create mtab if /etc is readonly
	if ! printf "" 2>/dev/null >/etc/mtab ; then
		ewarn "Skipping /etc/mtab initialization (ro root?)"
		return 0
	fi
	ebegin "Updating /etc/mtab"

	# With / as tmpfs we cannot umount -at tmpfs in localmount as that
	# makes / readonly and dismounts all tmpfs even if in use which is
	# not good. Luckily, umount uses /etc/mtab instead of /proc/mounts
	# which allows this hack to work.
	grep -v "^[^ ]* / tmpfs " /proc/mounts > /etc/mtab

	# Remove stale backups
	rm -f /etc/mtab~ /etc/mtab~~
	eend 0
}

root_rw() {
	echo 2>/dev/null >/.test.$$ || return 1
	rm -f /.test.$$
}

do_fsck() {
	local retval=0 opts= root=
	case "${RC_UNAME}" in
		FreeBSD) opts="-F";;
		Linux) opts="-T -C0";;
	esac

	# Don't bother doing a fsck on these
	if [ -n "${CDBOOT}" ] || is_net_fs / || is_union_fs / ; then
		return 0
	fi

	if root_rw; then
		einfo "root filesystem is mounted read-write - skipping"
		return 0
	fi

	root=$(fstabinfo --blockdevice /)
	[ ! -e "${root}" -a -e /dev/root ] && root=/dev/root

	if [ -e /forcefsck ] || get_bootparam "forcefsck" ; then
		ebegin "Checking root filesystem (full fsck forced)"
		fsck ${opts} -f -n "${root}"
		# /forcefsck isn't deleted because checkfs needs it.
		# it'll be deleted in that script.
		retval=$?
	else
		# Obey the fs_passno setting for / (see fstab(5))
		local pass=$(fstabinfo --passno /)
		if [ ${pass:-0} != "0" ] ; then
			ebegin "Checking root filesystem"
			fsck ${opts} -p "${root}"
			retval=$?
		else
			ebegin "Skipping root filesystem check" "(fstab's passno == 0)"
			retval=0
		fi
	fi

	if [ ${retval} -eq 0 ] ; then
		eend 0
	elif [ ${retval} -eq 1 ] ; then
		ewend 1 "Filesystem repaired"
		retval=0
	elif [ ${retval} -eq 8 ] ; then
		ewend 1 $"Operational error, continuing"
		retval=0
	elif [ ${retval} -eq 2 -o ${retval} -eq 3 ] ; then
		ewend 1 "Filesystem repaired, but reboot needed!"
		if ! yesno ${rc_force_auto:-${RC_FORCE_AUTO}}; then
			printf "\a"; sleep 1; printf "\a"; sleep 1
			printf "\a"; sleep 1; printf "\a"; sleep 1
			ewarn "Rebooting in 10 seconds ..."
			sleep 10
		fi
		einfo "Rebooting"
		reboot -f
	else
		if yesno ${rc_force_auto:-${RC_FORCE_AUTO}}; then
			eend 2 "Rerunning fsck in force mode"
			fsck ${opts} -y "${root}"
			retval=$?
		else
			eend 2 "Filesystem couldn't be fixed :("
			exec rc-abort || exit 1
		fi
		if [ ${retval} != "0" ] ; then
			einfo "Unmounting filesystems"
			if [ "${RC_UNAME}" = "Linux" ] ; then
				mount -a -o remount,ro /
			else
				mount -u -o ro /
			fi
			einfo "Rebooting"
			reboot -f
		fi
	fi
}

start() {
	do_fsck || return 1

	if ! root_rw; then
		ebegin "Remounting root filesystem read/write"
		if [ "${RC_UNAME}" = "Linux" ] ; then
			mount -n -o remount,rw /
		else
			mount -u -o rw /
		fi
		eend $? "Root filesystem could not be mounted read/write" || return $?
	fi

	# Only Linux has mtab
	[ "${RC_UNAME}" = "Linux" -a -e /proc/mounts ] && do_mtab

	# We got here, so return 0
	return 0
}

# vim: set ts=4 :