[Bug 1958055] Re: sudo apport-kde is in a different design (stripped XDG_CURRENT_DESKTOP)

[Benjamin Drung]

Upstream plugins/sudoers/env.c defines:

static const char *initial_keepenv_table[] = {
    "COLORS",
    "DISPLAY",
    "HOSTNAME",
    "KRB5CCNAME",
    "LS_COLORS",
    "PATH",
    "PS1",
    "PS2",
    "XAUTHORITY",
    "XAUTHORIZATION",
    NULL
};

Debian adds DPKG_COLORS to it.

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https://bugs.launchpad.net/bugs/1958055

Title:
  sudo apport-kde is in a different design (stripped
  XDG_CURRENT_DESKTOP)

Status in sudo package in Ubuntu:
  Confirmed

Bug description:
  Running ubuntu-bug as normal user has the correct theme (see
  screenshots attached to bug #1881640), but running "sudo ubuntu-bug"
  has a different, non-matching theme (see attached screenshot).

  This problem can be reproduce by running a KDE application on Ubuntu
  Desktop (GNOME):

  1. Launch ubuntu-22.04-desktop-amd64.iso
  2. Install apport-kde
  3. Run: /usr/share/apport/apport-kde -f
  4. Run: sudo /usr/share/apport/apport-kde -f
  5. Compare both windows. They have different icons and font size.

  Same result with KDE:

  1. Use kubuntu-22.04-desktop-amd64.iso
  2. Run ubuntu-bug -f
  3. Run: sudo ubuntu-bug -f

  [Analysis]

  Qt needs XDG_CURRENT_DESKTOP to be set to determine the correct theme,
  but XDG_CURRENT_DESKTOP is not in the list of environment variables to
  preserve (and not in env_keep in /etc/sudoers).

  On other other hand, sudo preserves the DISPLAY environment variable:

  $ sudo env | grep -Ev '^(LC|LS|SUDO|LANG|COLOR|TERM|PATH)'
  XAUTHORITY=/run/user/1000/gdm/Xauthority
  DISPLAY=:0
  MAIL=/var/mail/root
  LOGNAME=root
  USER=root
  HOME=/root
  SHELL=/bin/bash

  [Workaround]

  Prevent sudo from dropping XDG_CURRENT_DESKTOP by running: sudo
  XDG_CURRENT_DESKTOP=$XDG_CURRENT_DESKTOP /usr/share/apport/apport-kde
  -f

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: apport 2.20.9-0ubuntu7.27
  ProcVersionSignature: Ubuntu 5.4.0-94.106~18.04.1-generic 5.4.157
  Uname: Linux 5.4.0-94-generic i686
  ApportVersion: 2.20.9-0ubuntu7.27
  Architecture: i386
  CurrentDesktop: KDE
  Date: Sun Jan 16 05:04:24 2022
  InstallationDate: Installed on 2022-01-15 (0 days ago)
  InstallationMedia: Kubuntu 18.04.5 LTS "Bionic Beaver" - Release i386 (20200806.1)
  PackageArchitecture: all
  SourcePackage: apport
  UpgradeStatus: No upgrade log present (probably fresh install)

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