#!/bin/bash

#DESC Changes drive references in /etc/fstab to uuids instead of device names.

#HELP For every device that has a block id per $blkid, /etc/fstab is checked, and if the device is listed, replaces the drive with the uuid identifier.

cd /tmp
rm -f /tmp/blkidfile
[ ! -d /usr2/upgrade ] && mkdir /usr2/upgrade
cp /etc/fstab /usr2/upgrade/fstab.orig
blkid>blkidfile

DEV=sda
[ "`grep sda blkidfile | wc -l`" != "3" ] && DEV=sdb

uuid_fstab_line="`cat ./blkidfile | grep ${DEV}1 | cut -d" " -f2`"
sed -i "s/\/dev\/sda1/$uuid_fstab_line/g" /etc/fstab

uuid_fstab_line="`cat ./blkidfile | grep ${DEV}2 | cut -d" " -f2`"
sed -i "s/\/dev\/sda2/$uuid_fstab_line/g" /etc/fstab

uuid_fstab_line="`cat ./blkidfile | grep ${DEV}3 | cut -d" " -f2`"
sed -i "s/\/dev\/sda3/$uuid_fstab_line/g" /etc/fstab

systemctl daemon-reload
mount -a
[ "$?" == "0" ] && echo "Success." && exit 0

cp -f /usr2/upgrade/fstab.orig /etc/fstab
systemctl daemon-reload

exit 1