Bug#922647: Info received (Bug#922647: systemd --user no longer running)

[Michael Biebl]

Am 09.03.19 um 15:00 schrieb Michael Biebl:
> Am 09.03.19 um 14:10 schrieb Julien Leproust:
>> Hi,
>>
>> I found the issue.
>>
>> When looking for /etc files not belonging to any package, I discovered
>> that /etc/pam.d/common-* files are managed by pam-auth-update.
>>
>> Most pam profiles were enabled, except "Register user sessions in the
>> systemd control group hierarchy", and just enabling it fixed the
>> problem. The systemd user service and logind session are now correctly
>> started and everything works fine (device permissions, pulseaudio, etc).
>>
>> The real issue becomes why this pam profile got disabled in the first
>> place.
> 
> libpam-systemd uses pam-auth-update as documented.
> There is no code in the libpam-systemd package which disables/removes
> pam_systemd.so.
> 
> So either you have at some point modified /etc/pam.d/common-* yourself
> or there is a bug in pam-auth-update.
> 
> If I had to guess, the former is more likely.

Afaik, if at some point in the past you have modified
/etc/pam.d/common-* manually and you then install libpam-systemd,
pam-auth-update will preserve your local changes and not add pam_systemd.so.

Are you absolutely sure, pam_systemd.so was enabled in the past and at
some point suddenly removed from /etc/pam.d/common-session?

Or is it more likely that pam_systemd.so was never enabled?
If pam_systemd.so was suddenly disabled, can you pin this to a certain
event, like files being restored from a backup?

In case, there is not really something we can do about this in the
libpam-systemd package. As said, it does not actively remove pam_systemd.so.

What we might do is to include the contents of /etc/pam.d/common-session
in the bug report (via a libpam-systemd bugscript) to make issues like
this easier to spot in the future.

Michael




-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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