saving uncommitted changes in /etc prior to emerge run

init.d/mount-ro

@@ -0,0 +1,49 @@
+#!/sbin/runscript
+# 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 -vserver -lxc
+}
+
+start()
+{
+	local ret=0
+
+	# Flush all pending disk writes now
+	sync; 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
+}