Bug#993947: Time lost, /etc/systemd/timesyncd.conf gets replaced with a default one

[Michael Biebl]

Hi Felipe

Am 08.09.21 um 19:25 schrieb Michael Biebl:
> systemd-timesyncd was split into a separate binary package in bullseye. 
> Transferring the ownership of the conffile from systemd to 
> systemd-timesyncd is a tricky business as dpkg does not have native 
> support for that and so we need to go behind dpkg's back for that.
> 
> We do have some custom maintainer scripts code where we try to preserve 
> local modifications:
> https://salsa.debian.org/systemd-team/systemd/-/blob/debian/master/debian/systemd-timesyncd.postinst 

This code is based on
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=797048
i.e.
https://salsa.debian.org/systemd-team/systemd/commit/f5f5028055f25fa733a45265e7c008e06960e0a7

A typescript log from an upgrade is attached.
One can see, that systemd-timesyncd.postinst is run before 
systemd.postinst and as a result timesyncd.conf.dpkg-bak does not exist yet.

Afaics, this could only be fixed with a versioned Pre-Depends on systemd 
(>= 245.4-2). I don't think a Depends gives us any guarantees regarding 
the order postinst is run?

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