[ptxdist] systemd: Using second offline update service beside rc-once in PTXDIST

["Schenk, Gavin" <G.Schenk@eckelmann.de>]

Hi,

before continuing to hack ptxdist and rc-once, I would appreciate some feedback from the gurus.
 
I want to use systemd.offline-updated as introduced here and already used in PTXDIST by rc-once:
https://www.freedesktop.org/software/systemd/man/systemd.offline-updates.html#

In my use case, I have to do some data-migration stuff on an already delivered target. The data-migration has some deep impacts on the targets storages and I want to ensure no other stuff is running on the machine. Additionally I would like to provide my customers some gui when transforming the targets data. As the migration is done via shell scripts I use pv and dialog. To be able to use dialog a VT on the framebuffer I have to do some settings in the service file e.g.:

...
StandardOutput=tty                                                                                                                                                                             
StandardInput=tty                                                                                                                                                                              
TTYPath=/dev/tty1                                                                                                                                                                              
TTYReset=yes                                                                                                                                                                                   
TTYVHangup=yes
...

One of my problems is, that rc-once does not check where /system-update points to, as suggested. My idea is to install a second update-service that does the migration stuff instead of hacking rc-once service file and do it there. Running both in parallel is a bad idea!
 
What do you think about using readlink in systemd-rc-once and just exit without error if /system-update does point to another location than /etc/rc-once?
Another idea is to add a second service that doesn´t check /system-update either and use a after directive in its service file?
Is this something we want a common solution for?

Best regards
Gavin Schenk

Eckelmann AG
Vorstand: Dipl.-Ing. Peter Frankenbach (Sprecher) Dipl.-Wi.-Ing. Philipp Eckelmann
Dr.-Ing. Marco Münchhof Dr.-Ing. Frank Uhlemann
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Stv. Vorsitzender des Aufsichtsrats: Dr.-Ing. Gerd Eckelmann
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