Bug 97811 - Warn / fail if xdg-screensaver cannot find xprop
Summary: Warn / fail if xdg-screensaver cannot find xprop
Status: NEW
Alias: None
Product: Portland
Classification: Unclassified
Component: xdg-utils (show other bugs)
Version: 1.1.0
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Portland Bugs
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Reported: 2016-09-15 05:43 UTC by nicolas+freedesktop
Modified: 2017-02-18 21:11 UTC (History)
1 user (show)

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Description nicolas+freedesktop 2016-09-15 05:43:45 UTC
On Gnome 3, xdg-screensaver fails to suspend the screensaver if xprop is not installed.

Without xprop the $screensaver_file is not created (as xdg-screensaver cannot retrieve the window ID), and so the "inhibitor" placed on the session via DBus expires after the 10s sleep in the Perl DBus script loop.

---
while (1) {                                                                     
  sleep(10);                                                                    
  my $status = new IO::File($screensaver_file, "r")                             
    or exit 0;                       
---

xdg-screensaver seems to try to support the case where xprop is not installed (It checks for xprop, and various functions bail out early if it's not available). However with Gnome 3 (and perhaps with other environments) it seems it's a hard requirement, and as such the user should be warned if it's missing.

I believe that affects numerous users as there have been several reports of xdg-screensaver failing with Gnome in various projects:

* https://bugzilla.redhat.com/show_bug.cgi?id=665918
* https://trac.videolan.org/vlc/ticket/4739
* https://forum.videolan.org/viewtopic.php?t=127389


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