pacman-systemd-inhibit

Inhibit system shutdown, reboot etc. when pacman is upgrading the system.

Accidental shutdown or reboot of the system when pacman is upgrading the system, can lead to unbootable / broken system or broken packages.

These hooks and script, inhibit accidental system shutdown, reboot etc. when pacman is upgrading the system.

How to install?

1. Create a symlink file, /usr/bin/pacman-systemd-inhibit-sleep, symlinked to /usr/bin/sleep
2. Place hook files in /usr/share/libalpm/hooks directory.
3. Place script file in /usr/share/libalpm/scripts directory.

How it works?

1. When pacman begins the upgrade, it calls a PreTransaction hook 00-50-systemd-inhibit.hook. This hook puts an inhibition lock for shutdown, restart etc. with timeout of 15 minutes.
2. When pacman finishes the upgrade, it calls a PostTransaction hook zz-50-systemd-inhibit.hook. This hook removes the inhibition lock.

Note: In case pacman takes more than 15 minutes to upgrade (which is highly unlikely), then the inhibition lock gets removed, but pacman continues to function normally.