On Tuesday, January 18, 2011 08:52:57 pm Robert Nichols wrote: > On 01/18/2011 12:28 PM, Rick Sewill wrote: > > On Tuesday, January 18, 2011 09:00:22 am Robert Nichols wrote: > >> On 01/18/2011 01:34 AM, Rick Sewill wrote: > >>> On Monday, January 17, 2011 10:57:00 pm Robert Nichols wrote: > >>>> On 01/17/2011 09:57 PM, Rick Sewill wrote: > >>>>> Question please: > >>>>> > >>>>> Can you use > >>>>> gnome-screensaver-command -q > >>>>> > >>>>> man gnome-screensaver-command > >>>>> > >>>>> I'm currently trying out KDE so I don't know > >>>>> what is returned by the above command for the > >>>>> various gnome-screensaver states. > >>>> > >>>> As I said in my original message, when run from a cron job that fails: > >>>> ** Message: Failed to connect to the D-BUS daemon: > >>>> /bin/dbus-launch terminated abnormally with the following > >>>> error: Autolaunch error: X11 initialization failed. > >>>> > >>>> And yes, I did try it with "DISPLAY=:0.0" in the environment. > >>> > >>> You have a good puzzle! > >>> > >>> I read all the responses for the problem, > >>> http://www.mail-archive.com/debian-kde@xxxxxxxxxxxxxxxx/msg30421.html > >>> > >>> I tried to condense their answer to the following...please give it a > >>> try: > >>> > >>> I created a file, ${HOME}/bin/testscreensaver > >>> ===== Please begin contents of file testscreensaver with following line > >>> #!/bin/bash > >>> > >>> # We must set the DISPLAY variable so dbus is happy. > >>> > >>> export DISPLAY=:0.0 > >>> > >>> # We must find the DBUS_SESSION_BUS_ADDRESS so dbus is happy. > >>> > >>> for pid in $(pgrep -u $USER) > >>> do > >>> > >>> declare DBUS_SESSION_BUS_ADDRESS=$(cat /proc/${pid}/environ | \ > >>> > >>> tr '\0' '\n' | grep "DBUS_SESSION_BUS_ADDRESS=") > >>> > >>> # I looked for the first DBUS_SESSION_BUS_ADDRESS found. > >>> > >>> [ -z "${DBUS_SESSION_BUS_ADDRESS}" ] || break > >>> > >>> done > >>> > >>> > >>> # Strip off the DBUS_SESSION_BUS_ADDRESS= string at the beginning. > >>> DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:25}" > >>> > >>> # I echo it for debugging purposes...you probably don't want to echo > >>> it. echo "Set bus address to<${DBUS_SESSION_BUS_ADDRESS}>" > >>> > >>> # If I have a string, I call the gnome-screensaver-command > >>> [ -z "${DBUS_SESSION_BUS_ADDRESS}" ] || gnome-screensaver-command -q > >>> > >>> ===== Please end file testscreensaver with previous line > >> > >> Hmmm, in that script you're not doing anything with > >> DBUS_SESSION_BUS_ADDRESS beyond testing for non-null (it's not > >> exported), so "Set bus address to" is a misnomer. "Found bus address" > >> might be more to the point. It does test whether this user currently > >> has a session, which is useful. > > > > Please see "man dbus-daemon". > > > > I believe the variable, DBUS_SESSION_BUS_ADDRESS, must be set for desktop > > applications to find the per-session daemon to have interprocess > > communication amongst themselves. From "man dbus-daemon", I am > > referring to the per-session daemon, not the systemwide daemon. > > Look again at the script you posted and explain where it does anything but > set and test for non-null an internal shell variable that has no special > meaning to the shell itself. Had you in some manner exported that variable > so that gnome-screensaver-command could see it, then I would have more > reason to believe you. I stand corrected. I ran a test without DBUS_SESSION_BUS_ADDRESS set. Only the export DISPLAY=:0.0 seems to be needed.
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