[Bug 1771791] Re: Need to pre-depend on stuff used by systemctl, so systemctl works in other package's preinst

[Dimitri John Ledkov]

** Also affects: systemd (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: systemd (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: systemd (Ubuntu Cosmic)
       Status: New => Fix Committed

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Title:
  Need to pre-depend on stuff used by systemctl, so systemctl works in
  other package's preinst

Status in systemd package in Ubuntu:
  Fix Committed
Status in systemd source package in Bionic:
  New
Status in systemd source package in Cosmic:
  Fix Committed
Status in systemd package in Debian:
  New

Bug description:
  [Impact]
  systemd used to pre-depend on the libraries used by systemctl or something, but now systemctl uses libsystemd-shared, and there are no pre-depends for that, meaning that systemctl fails in maintainer scripts of other packages.

  [Test case]
  Grab the apt-clone file from comment #20 in bug 1766890, and upgrade it to bionic with apt dist-upgrade -o APT::Immediate-Configure=0. Make sure to not see error about missing libraries in systemctl.

  [Regression potential]
  Installation ordering changes. Might make things harder for apt to solve.

  [Other info]
  Debian 897986

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