Bug#935304: libpam-systemd: Please relax Depends: systemd-sysv

[Michael Biebl]

On Fri, 31 Jan 2020 02:36:29 -0500 Sam Hartman <hartmans at debian.org> wrote:
> >>>>> "Michael" == Michael Biebl <biebl at debian.org> writes:
> 
>     Michael> Tbh, I'm not sure what kind of answer you expect from me.
> 
>     Michael> I guess I already provided my feedback here and mentioned
>     Michael> what kind of solution I prefer. I can repeat this in this
>     Michael> bug report, but I'm not sure if this is helpful.
> 
> Are you referring to the idea of   using libsystemd0 and having elogind
> use the same dbus interface so be able to reuse libsystemd0?
> 
> If so, Mark explained  why that didn't work in #940034.
> I think when you originally raised the concern Mark may not have
> entirely  understood what you were thinking about.  But at least if I
> characterized things correctly above, Mark did fully explore that option
> in #940034.
> 
> A brief summary is that libelogind0 does basically use the same dbus
> interface as libsystemd0.  However, libsystemd0's interface requirements
> extends beyond dbus; there are a number of functions that for example
> are implemented purely in terms of cgroup membership tests.  Elogind's
> interface diverges among other reasons because elogind has a different
> cgroup hierarchy.

If this is unfixable in elogind, I only see two alternatives:

a/ elogind is not suitable for a binary distro like Debian and should be
removed
b/ you need a different way to switch over. Reboot into an environment
for which you have control over, then uninstall systemd/systemd-sysv
without triggering the removal of most packages.

I acknowledge that this is inconvenient, but such a switch-over should
not happen often.

Michael

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