[Trigger]
Type=Package
Operation=Install
Operation=Upgrade
Operation=Remove
Target=*

[Action]
Description=Making BTRFS snapshot...
Depends=btrfs-progs
When=PreTransaction
Exec=/usr/bin/sh -c "/usr/bin/btrfs subvolume snapshot / /snaps/root@$(date +%Y-%m-%d_%H-%M-%S)_pacman_pre"
AbortOnFail
NeedsTargets