post_install() {
  # Change default wallpaper
  dbus-launch gsettings set org.gnome.desktop.background picture-uri file:///usr/share/parabola/artwork/stripes.png
  dbus-launch gsettings set org.gnome.desktop.background picture-options zoom
  
  # Change default lock screen wallpaper.
  dbus-launch gsettings set org.gnome.desktop.screensaver picture-uri file:///usr/share/parabola/artwork/stripes-desaturated.png
  dbus-launch gsettings set org.gnome.desktop.screensaver picture-options zoom
}

post_upgrade() {
  post_install $1
}

post_remove() {
  # Reset default wallpaper to default for GNOME (if the user didn't choose some other).
  if [ $(dbus-launch gsettings get org.gnome.desktop.background picture-uri) == "file:///usr/share/parabola/artwork/stripes.png" ]
  then
    dbus-launch gsettings reset org.gnome.desktop.background picture-uri
    dbus-launch gsettings reset org.gnome.desktop.background picture-options
  fi

  # Reset default lock screen wallpaper to default for GNOME (if the user didn't choose some other).
  if [ $(dbus-launch gsettings get org.gnome.desktop.screensaver picture-uri) == "file:///usr/share/parabola/artwork/stripes.png" ]
  then
    dbus-launch gsettings reset org.gnome.desktop.screensaver picture-uri
    dbus-launch gsettings reset org.gnome.desktop.screensaver picture-options
  fi
}