[Bug 1804887] Re: software-properties-qt should not run as root

[Carlo Vanini]

** Branch linked: lp:~silhusk/software-properties/lp1804887-qt-dbus

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Title:
  software-properties-qt should not run as root

Status in software-properties package in Ubuntu:
  New

Bug description:
  s-p-qt should not be run as root (with sudo or pkexec), instead it
  should use the DBus backend like s-p-gtk does. This way the UI runs as
  unprivileged user, and the user is asked for credentials when making
  changes.

  Motivation:
  * Running the UI with sudo is bad.
  * It doesn't work in Wayland. (https://bugs.kde.org/show_bug.cgi?id=391965)
  * The DBus backend already exists and is used by s-p-gtk.

  RFC:
  The attached patch changes s-p-qt to use the DBus service for the settings in the first tab (enable/disable components, change server).
  Any comment on how it works or should work?

  Known issues with the patch:
  * When a change fails to be applied the UI doesn't notice and is out of sync with system state. That's because the DBus service never returns a value (except for DBus error). Solution is to reload the config after every change attempt.

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