Snapper on Ubuntu 13.10

Setting up apt-get to make pre/post snapshots for installs

Add below to the file /etc/apt/apt.conf.d/80-btrfs-snapper
DPkg::Pre-Invoke {"[ -f '/usr/bin/snapper' ] && snapper create --type=pre --cleanup-algorithm=number --print-number --description='apt-get' > /var/tmp/snapperpreid"; };
DPkg::Post-Invoke {"[ -f '/usr/bin/snapper' ] && snapper create --type=post --cleanup-algorithm=number --print-number --pre-number=$(cat /var/tmp/snapperpreid) > /dev/null; rm /var/tmp/snapperpreid"; };

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