D23378: Check if sddm user exists

[Filip Fila]

filipf created this revision.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
filipf requested review of this revision.

REVISION SUMMARY
  Sddm-kcm should depend on sddm.
  Sddm sets up an sddm user which is used to run the greeter.
  Therefore it should not be possible to run sddm-kcm without an sddm user existing.
  
  But if it should happen that's the case, this patch adds a check for the sddm user.
  If the user is not present, everything will be aborted and an error message will pop-up.
  
  openSUSE BUG: https://bugzilla.opensuse.org/show_bug.cgi?id=1146817, https://bugzilla.opensuse.org/show_bug.cgi?id=1146831

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  sddm-user-check (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23378

AFFECTED FILES
  src/advanceconfig.cpp

To: filipf
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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