saving uncommitted changes in /etc prior to emerge run

init.d/udev-mount

@@ -0,0 +1,81 @@
+#!/sbin/runscript
+# Copyright 1999-2013 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+description="mount devtmpfs on /dev"
+
+depend()
+{
+	provide dev-mount
+	keyword -vserver -lxc
+}
+
+mount_dev_directory()
+{
+	local mounted=false fstab=false action=--mount msg=Mounting rc=0
+
+	if ! grep -qs devtmpfs /proc/filesystems; then
+		eerror "CONFIG_DEVTMPFS=y is required in your kernel configuration"
+		eerror "for this version of udev to run successfully."
+		eerror "This requires immediate attention."
+		if ! mountinfo -q /dev; then
+			mount -n -t tmpfs dev /dev
+			busybox mdev -s
+			mkdir /dev/pts
+		fi
+		return 1
+	fi
+
+	# Is /dev already a mounted devtmpfs?
+	mountinfo -q -f devtmpfs /dev && mounted=true
+
+	# If an entry for /dev exists in fstab it must be a devtmpfs.
+	fstabinfo -q -t devtmpfs /dev && fstab=true
+
+	# No options are processed here as they should all be in /etc/fstab
+	if $fstab; then
+		$mounted && action=--remount && msg=Remounting
+		ebegin "$msg /dev according to /etc/fstab"
+		fstabinfo $action /dev
+		rc=$?
+	elif ! $mounted; then
+		ebegin "Mounting /dev"
+		# Some devices require exec, Bug #92921
+		mount -n -t devtmpfs -o "exec,nosuid,mode=0755,size=10M" udev /dev
+		rc=$?
+	else
+		ebegin "Using /dev mounted from kernel"
+	fi
+
+	eend $rc
+}
+
+seed_dev()
+{
+	# Seed /dev with some things that we know we need
+
+	# creating /dev/console, /dev/tty and /dev/tty1 to be able to write
+	# to $CONSOLE with/without bootsplash before udevd creates it
+	[ -c /dev/console ] || mknod -m 600 /dev/console c 5 1
+	[ -c /dev/tty1 ] || mknod -m 620 /dev/tty1 c 4 1
+	[ -c /dev/tty ] || mknod -m 666 /dev/tty c 5 0
+
+	# udevd will dup its stdin/stdout/stderr to /dev/null
+	# and we do not want a file which gets buffered in ram
+	[ -c /dev/null ] || mknod -m 666 /dev/null c 1 3
+
+	# so udev can add its start-message to dmesg
+	[ -c /dev/kmsg ] || mknod -m 660 /dev/kmsg c 1 11
+
+	# Create problematic directories
+	mkdir -p /dev/pts /dev/shm
+	return 0
+}
+
+start()
+{
+	mount_dev_directory || return 1
+
+	seed_dev
+	return 0
+}