Bug#934491: libelogind0: failing to switch from systemd to sysvinit-core/elogind results in libsystemd.so.0 disappearing

[Thorsten Glaser]

On Tue, 13 Aug 2019, Adam Borowski wrote:

> The prerm also makes systemd non-removable without uninstalling most packages,
> rebooting, then installing anew.  Requiring such a reinstall is pretty much
> RC in by book.
> 
> I've reported this before as #930105 but this got insta-closed+downgraded by

Hm ☹ but I just had this crazy idea:

1. Merge elogind into libpam-elogind (not the other way round),
   as elogind without libpam-elogind is apparently (see the
   other thread) not useful in any way.

2. Make libpam-elogind (which apparently Provides logind) work with
   libsystemd0 and not Conflict with systemd, only systemd-sysv.
   This means code changes (so it works with either library) and
   packaging changes: Depends: libelogind0 (>= …) | libsystemd0 (>= …)
   (note libelogind0 is first, for fresh installs)

3. Create a new package elogind which Depends on libelogind0 and
   libpam-elogind and Conflicts with systemd, to finish the install.
   It probably belongs into Section metapackages and has no content
   and can use dh_installdocs --link-doc=libpam-elogind so even its
   /usr/share/doc/elogind is just a symlink.

This way, a sequence would look like:

- apt-get install libpam-elogind
  ⇒ removes libpam-systemd and systemd-sysv
  ⇒ installs libpam-elogind and sysvinit-core
- reboot
- apt-get install elogind
  ⇒ removes systemd
  ⇒ replaces libsystemd0 with libelogind0

If this is not suitable I’m blaming the beer I’ve had with supper.

bye,
//mirabilos
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