[BLFS Trac] #23271: Instructions to test xfce4-notifyd may fail

#23271: Instructions to test xfce4-notifyd may fail
-------------------------+-----------------------
 Reporter:  pierre       |      Owner:  blfs-book
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  13.1
Component:  BOOK         |    Version:  git
 Severity:  normal       |   Keywords:
-------------------------+-----------------------
 In the book, we say to issue:
 {{{
 notify-send -i info Information "Hello $USER, this is a test"
 }}}
 to test xfce4-notifyd after installing it. But there are several reasons
 why this may fail:
 - DISPLAY is not defined in the systemd user environment. Then, since
 xfce4-notifyd is started by systemd, it cannot find the display and fails
 - several .service files with the same bus name
 "org.freedesktop.Notifications" may be installed in
 /usr/share/dbus-1/services, and the wrong one may be used. An
 [https://github.com/systemd/systemd/issues/312 old thread] seems to
 conclude that the only way to avoid this is to remove the faulty file(s).

 We should therefore decide how to modify the instructions so that the test
 does not fail in the above cases. We can either:
 - tell the user to run:
   {{{
      systemctl --user set-environment DISPLAY=$DISPLAY
   }}}
   '''and''' to ensure that only one .service file containing
 Name=org.freedesktop.Notifications is in the services directory
 - start the daemon before running the test:
   {{{
      /usr/lib/xfce4/notifyd/xfce4-notifyd &
   }}}
 - remove the test altogether (we don't test other notify daemons in this
 way)

 But we cannot leave the instructions as they are...
-- 
Ticket URL: <https://wiki.linuxfromscratch.org/blfs/ticket/23271>
BLFS Trac <https://wiki.linuxfromscratch.org/blfs/>
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