[arch-releng] HEADSUP: mkinitcpio and shutdown

[Thomas Bächler]

The new mkinitcpio 16 (yes, we bumped from 0.15 to 16) in testing
contains a new feature that automatically generates an "initramfs" on
shutdown. systemd will pivot to this image on shutdown. All it does is
re-run systemd-shutdown in a ramdisk, thus allowing a proper umount of /
and proper shutdown of ALL loop and device mapper devices.

This feature is enabled automatically if
* /run/initramfs exists (will be created on your next boot by tmpfiles),
* /run/initramfs/shutdown doesn't exist or is not an executable,
* The user hasn't masked mkinitcpio-generate-shutdown-ramfs.service.

This method should also be able to completely obsolete the custom
shutdown hook in archiso and the mkinitcpio shutdown hook (using any of
those will disable the new stuff).

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