Andreas,
Nice job hunting this down. I'd been seeing it as well upstream (http://trac.mapnik.org/ticket/392
) but had not taken the time to debug.
I agree that #2 is critical - that we avoid crashes if pycairo python
module is unavailable at import time even if mapnik was compiled with
pycairo support.
Dane
On Jul 27, 2009, at 8:13 AM, Andreas Barth wrote:
Package: python-mapnik
Version: 0.6.0-1
Severity: serious
Tags: patch
Hi,
after installation of python-mapnik I tried to generate images, but I
got segmentation faults.
After some debugging (thanks, Steve) we found that the culprit is that
Pycairo_CAPI is null. This should be set by Pycairo_IMPORT. Howver,
looking at the code of PyCObject_Import this function returns null if
the requested python library is not there.
So, there are two possibilities to resolve this issue:
1. Add an dependency to python-cairo to the package.
2. Add an error message to the initalization function in case the
function returns null.
I think best both should be done.
Cheers,
Andi
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