rollback_oldstable_nach_stable_und_testing.sh

#!/bin/bash
# Rollback OLDSTABLE -> STABLE -> TESTING
# ---------------------------
# Rollback - Btrfs
# ---------------------------

BTRFS=/usr/bin/btrfs
CP=/usr/bin/cp
ECHO=/usr/bin/echo
GREP=/usr/bin/grep
MOUNT=/usr/bin/mount
MV=/usr/bin/mv
PACAUR=/usr/bin/pacaur
PACMAN=/usr/bin/pacman
REFLECTOR=/usr/bin/reflector
SED=/usr/bin/sed
SUDO=/usr/bin/sudo

# ---------------------------
#      Rollback System
# ---------------------------
bootstate=`$MOUNT | $GREP "on / type btrfs" | $GREP "subvol=/@snapshots/OLDSTABLE"`
if [ -z $"{bootstate}" ]
    then
        $ECHO ""
        $ECHO $bootstate
        $ECHO ""
        $ECHO "System ist nicht mit OLDSTABLE hochgefahren !"
        $ECHO "ENDE !"
        exit
    else
        # --------- ROLLBACK - OLDSTABLE -> STABLE ----------
        $SUDO $BTRFS subvolume delete /.snapshots/STABLE
        $SUDO $BTRFS subvolume snapshot / /.snapshots/STABLE
        $SUDO $SED -i 's/OLDSTABLE/STABLE/g' /.snapshots/STABLE/etc/fstab
        $SUDO $CP /boot/vmlinuz-linux-oldstable /boot/vmlinuz-linux-stable
        $SUDO $CP /boot/initramfs-linux-oldstable.img /boot/initramfs-linux-stable.img

        # -------- ROLLBACK - OLDSTABLE -> TESTING --------
        $SUDO $BTRFS subvolume delete /.snapshots/TESTING
        $SUDO $BTRFS subvolume snapshot / /.snapshots/TESTING
        $SUDO $SED -i 's/OLDSTABLE/TESTING/g' /.snapshots/TESTING/etc/fstab
        $SUDO $CP /boot/vmlinuz-linux-oldstable /boot/vmlinuz-linux
        $SUDO $CP /boot/initramfs-linux-oldstable.img /boot/initramfs-linux.img

        # ---------------------------
        #    Balance Filesystem
        # --------------------------
        $SUDO $BTRFS balance start -dusage=5 /btrfs
fi