Hooks for creating snapper pre- and post- snapshots before and after pacman transactions
Since the hooks themselves cannot pass information between them, and the post command requires the pre-number, a pair of auxiliary scripts are used and a small temp file created under /var/tmp to keep track of it.
Build and install the package, or copy the files over manually
snapper-*.hookgo to/usr/share/libalpm/hookssnapper-*.shgo to/usr/local/bin(or wherever you prefer, just make sure to change it on the hook files)
The hooks are set to fail in case of error taking the snapshot. If that's not what you want, then either comment the AbortFail directive on the hook files or, if you're feeling particularly lazy, just set the last line to exit 0 on the pre- helper script.
BEWARE that doing the above, however, might just kill you with the very weapon you're trying to use to defend yourself. You've been warned.
You have the right to get screwed by this, but you DON'T have the right to complain to me about it. No warranties, safeguards or anything else provided.
These scripts are licensed under public domain. Feel free to do whatever you want with them (because putting something like this under whatever license is not only useless, but waaay to much work for a dozen lines of obvious code).