etc-gentoo/init.d/mount-ro

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#!/sbin/openrc-run
# Copyright (c) 2007-2009 Roy Marples <roy@marples.name>
# Released under the 2-clause BSD license.
description="Re-mount filesytems read-only for a clean reboot."
depend()
{
need killprocs savecache
keyword -openvz -prefix -systemd-nspawn -vserver -lxc
}
start()
{
local ret=0
# Flush all pending disk writes now
sync
ebegin "Remounting remaining filesystems read-only"
# We need the do_unmount function
. "$RC_LIBEXECDIR"/sh/rc-mount.sh
eindent
# Bug 381783
local rc_svcdir=$(echo $RC_SVCDIR | sed 's:/lib\(32\|64\)\?/:/lib(32|64)?/:g')
local m="/dev|/dev/.*|/proc|/proc.*|/sys|/sys/.*|/run|${rc_svcdir}" x= fs=
m="$m|/bin|/sbin|/lib(32|64)?|/libexec"
# RC_NO_UMOUNTS is an env var that can be set by plugins
local IFS="$IFS:"
for x in $no_umounts $RC_NO_UMOUNTS; do
m="$m|$x"
done
m="^($m)$"
fs=
for x in $net_fs_list $extra_net_fs_list; do
fs="$fs${fs:+|}$x"
done
[ -n "$fs" ] && fs="^($fs)$"
do_unmount "umount -r" \
--skip-point-regex "$m" \
"${fs:+--skip-fstype-regex}" $fs --nonetdev
ret=$?
eoutdent
eend $ret
}