openrc/init.d/mtab.in

#!@SBINDIR@/openrc-run
# Copyright (c) 2007-2008 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.

description="Update /etc/mtab to match what the kernel knows about"

depend()
{
	need root
	keyword -prefix -systemd-nspawn
}

start()
{
	[ -L /etc/mtab ] && return 0
	local rc=0
	ebegin "Updating /etc/mtab"
	if ! checkpath -W /etc; then
		rc=1
	elif [ ! -e /etc/mtab ]; then
		ln -snf /proc/self/mounts /etc/mtab
	else
		ewarn "The support for updating /etc/mtab as a file is"
		ewarn "deprecated and will be removed in the future."
		ewarn "Please run the following command as root on your system."
		ewarn
		ewarn "ln -snf /proc/self/mounts /etc/mtab"
		ewarn

		# 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~~
	fi
	eend $rc "/etc is not writable; unable to create /etc/mtab"
	return 0
}