packaging: don't fail if systemd is not ready

[brainexe]

We faced a small issue while upgrading the package in a non systemd-context (in chroot). I just made the prerm more tolerant now.

/usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold -o APT::Get::Remove=No install grafsy' returned 100: Reading package lists...
Building dependency tree...
Reading state information...
The following packages will be upgraded:
  grafsy
1 upgraded, 0 newly installed, 0 to remove and 113 not upgraded.
Need to get 0 B/4796 kB of archives.
After this operation, 1109 kB of additional disk space will be used.
(Reading database ... 54271 files and directories currently installed.)
Preparing to unpack .../grafsy_2.1.5.c14.gf4d3a0e_amd64.deb ...
Removed /etc/systemd/system/multi-user.target.wants/grafsy.service.
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
dpkg: warning: old grafsy package pre-removal script subprocess returned error exit status 1
dpkg: trying script from the new package instead ...
System has not been booted with systemd as init system (PID 1). Can't operate.
Failed to connect to bus: Host is down
dpkg: error processing archive /var/cache/apt/archives/grafsy_2.1.5.c14.gf4d3a0e_amd64.deb (--unpack):
 new grafsy package pre-removal script subprocess returned error exit status 1
disabled

[Felixoid]

Did you check it works with the new script? Could you provide the output?

[brainexe]

yea, I tested in the broken chroot context and in a default Debian environment. Both ones worked, here the new Debian logs from apt upgrade:

Preparing to unpack .../grafsy_2.1.6.c0.g11a5b18_amd64.deb ...
Removed /etc/systemd/system/multi-user.target.wants/grafsy.service.
Unpacking grafsy (2.1.6.c0.g11a5b18) over (2.1.5.c14.gf4d3a0e) ...
Setting up grafsy (2.1.6.c0.g11a5b18) ...
disabled
Created symlink /etc/systemd/system/multi-user.target.wants/grafsy.service -> /lib/systemd/system/grafsy.service.

For the other one I only have the history.log which does not contain whole stdout...just succeeded now:

/var/log/apt/history.log:Commandline: /usr/bin/apt-get -q -y -o DPkg::Options::=--force-confold -o APT::Get::Remove=No install grafsy
/var/log/apt/history.log-Requested-By: matze (25932)
/var/log/apt/history.log:Upgrade: grafsy:amd64 (2.1.5.c0.g1b35dc8, 2.1.6.c0.g11a5b18)
/var/log/apt/history.log-End-Date: 2025-02-07  10:08:58