On 2013-12-14 15:00, Mattia Verga wrote:
Il 14/12/2013 12:55, Dridi Boukelmoune ha scritto:
Hi,
On Sat, Dec 14, 2013 at 12:44 PM, Mattia Verga<mattia.ve...@tiscali.it> wrote:
Hello,
I'm trying to give a user access rights to X with xhost command.
I've created a script named '/usr/bin/boincxhost' (chmod 555) like this:
#!/bin/sh
xhost +SI:localuser:boinc &> /dev/null
exit 0
"exit 0" will hide a non-zero exit status of the previous command.
In this case I'm not sure what's happening, but if you're running the
command in background, and don't wait for it to complete, you may be
facing a race condition.
Ok, I tried to edit the boincxhost script in this way:
#!/bin/sh
xhost +SI:localuser:boinc
sleep 1
Now if I run the script from console I get:
$ /usr/bin/boincxhost
localuser:boinc being added to access control list
$ xhost
access control enabled, only authorized clients can connect
SI:localuser:boinc
SI:localuser:marvin
But if I run it within systemd unit the service is started, but xhost
command "silently" fails:
# systemctl start boinc-client.service
# systemctl status boinc-client.service
boinc-client.service - Berkeley Open Infrastructure Network Computing
Client
Loaded: loaded (/usr/lib/systemd/system/boinc-client.service; disabled)
Active: active (running) since sab 2013-12-14 14:52:25 CET; 4s ago
Process: 2843 ExecStopPost=/bin/rm -f /var/lib/boinc/lockfile
(code=exited, status=0/SUCCESS)
*Process: 2947 ExecStartPre=/usr/bin/boincxhost (code=exited,
status=0/SUCCESS)*
Process: 2944 ExecStartPre=/usr/bin/chown boinc:boinc
/var/log/boinc.log /var/log/boincerr.log (code=exited, status=0/SUCCESS)
Process: 2941 ExecStartPre=/usr/bin/touch /var/log/boinc.log
/var/log/boincerr.log (code=exited, status=0/SUCCESS)
Process: 2938 ExecStartPre=/bin/sleep 1 (code=exited, status=0/SUCCESS)
Main PID: 2952 (boinc)
CGroup: name=systemd:/system/boinc-client.service
├─2952 /bin/bash /usr/bin/boinc --dir /var/lib/boinc
└─2953 /usr/bin/boinc_client --allow_multiple_clients --dir
/var/l...
dic 14 14:52:23 deneb systemd[1]: Starting Berkeley Open
Infrastructure Net.....
*dic 14 14:52:24 deneb boincxhost[2947]: xhost: unable to open
display ""*
dic 14 14:52:25 deneb systemd[1]: Started Berkeley Open Infrastructure
Netw...t.
# xhost
access control enabled, only authorized clients can connect
SI:localuser:marvin
I really wonder if $DISPLAY is defined within systemd's execution
context. IMHO, it shouldn't E. g., try adding
exec &> /tmp/boincxhost.log
set -x
at the top of your script. That should give debug output from the
script. I'd presume there is some error message when run from systemd.
Or, I'm just plain wrong. Dunno :)
--alec
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