[Qgis-developer] QGIS Server - GetPrint with a composer containing HTML block causes segfault

[kimaidou]

Hi Tim and Marco

I come back to this subject after helping to solve the performance problem
with Mathias.
So, I am first runnning my tests on my ubuntu laptop. Since it is my
computer, it is not ubuntu server but the classical Ubuntu with an X server
running.

I tried in my terminal
echo $DISPLAY
:0

So it seems (but I am far from being a X server guru !) that this is the
DISPLAY value I should pass to QGIS Server.
This is why I added the following configurartion in my virtual host (and in
the fastcgi config file):

In the virtual host
        ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/
        <Directory "/usr/lib/cgi-bin">
                AllowOverride None
                Options +ExecCGI -MultiViews FollowSymLinks
                Order allow,deny
                Allow from all
                SetEnv LD_LIBRARY_PATH "/home/kimaidou/src/qgis/build/lib"
                SetEnv DISPLAY :0
        </Directory>


In /etc/apache2/mods-available/fastcgi.conf

<IfModule mod_fastcgi.c>
  AddHandler fastcgi-script .fcgi
  #FastCgiWrapper /usr/lib/apache2/suexec
  FastCgiIpcDir /var/lib/apache2/fastcgi
  FastCgiConfig -idle-timeout 70 -maxClassProcesses 50 -minProcesses 3
-init-start-delay 3 -restart-delay 20 -startDelay 15 -initial-env
DISPLAY=:0 -initial-env LD_LIBRARY_PATH=/home/kimaidou/src/qgis/build/lib/
</IfModule>

I am pretty confident the default configuration is not used but I doubled
it just in case

After restarting my Apache Server, QGIS Server just hangs with the very
simple URL
http://localhost/cgi-bin/qgis_mapserv.fcgi
which should reply with an error in XML format.
So it seems Apache/QGIServer do not like my DISPLAY parameter.

Any hint ?
Would it be simplier to test this in a real server with no existing X
Server by using Xfvb ?

Michael


2013/5/22 Tim Sutton <lists at linfiniti.com>

> Hi
>
> You might also want to consider using Xfvb as a 'fake' xserver.
>
> Regards
>
> Tim
>
> On Wed, May 22, 2013 at 10:19 AM, kimaidou <kimaidou at gmail.com> wrote:
> > Thanks for your answer Marco. I will try to use the workaround you
> described
> > and report progress here.
> >
> > Michael
> >
> >
> > 2013/5/22 Marco Hugentobler <marco.hugentobler at sourcepole.ch>
> >>
> >> Hi Michael
> >>
> >> I also encountered that problem. Unfortunately, it seems that QWebKit
> >> requires a running x-server. So it won't be possible to use html items
> in
> >> server projects (or you can run an x-server and set the DISPLAY
> variable in
> >> the fcgi conf).
> >>
> >> Regards,
> >> Marco
> >>
> >> On 22.05.2013 09:43, kimaidou wrote:
> >>
> >> Hi list
> >>
> >> I have tried it with today's qgis master.
> >>
> >> I have a very simple project with one shapefile containing 3 polygones.
> I
> >> created a composer with a map. GetPrint request works fine with it. If
> I add
> >> an HTML block in the composer (refering to one HTML file or not), the
> >> getPrint request raises a segfault.
> >>
> >> Apache error log is the well-known :
> >> "Premature end of script headers: qgis_mapserv2.fcgi"
> >>
> >> By the way, I compiled QGIS with -DCMAKE_BUILD_TYPE=debug , but I do not
> >> know where I can find complet log for QGIS Server. Is there a file
> where I
> >> can get complete log for QGIS Server ?
> >>
> >> I can provide a sample project if needed. I have not found a ticket in
> the
> >> hub, so I will fill one, but I would prefer to do so with a
> self-explaining
> >> log.
> >>
> >> Michael
> >>
> >>
> >> _______________________________________________
> >> Qgis-developer mailing list
> >> Qgis-developer at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>
> >>
> >>
> >> --
> >> Dr. Marco Hugentobler
> >> Sourcepole -  Linux & Open Source Solutions
> >> Weberstrasse 5, CH-8004 Zürich, Switzerland
> >> marco.hugentobler at sourcepole.ch http://www.sourcepole.ch
> >> Technical Advisor QGIS Project Steering Committee
> >>
> >>
> >> _______________________________________________
> >> Qgis-developer mailing list
> >> Qgis-developer at lists.osgeo.org
> >> http://lists.osgeo.org/mailman/listinfo/qgis-developer
> >>
> >
> >
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> >
>
>
>
> --
> Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
> ==============================================
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