[GRASS-dev] Working with TGIS without starting GRASS explicitly

[Laurent C.]

Hello all,

I've ran into another related issue.
One of the goal of running the software outside of GRASS shell is to
batch process simulations in various Locations/mapsets.

I set the GRASS session for each case. The simulation works well for
the first case.
However when starting the second case, tgis.init() fails with the
following error:

ERROR: Unable to execute sql statement. There is no temporal database
connection defined for mapset <hull>

The mapset and location are properly set.
If this case is run first, it works well and it's the second one that fail.
Running t.connect -c between two cases does not solve the problem.
Actually, t.connect -p shows the correct connection parameters, but
tgis.init() still fails.

Regards,
Laurent


2016-09-21 18:27 GMT-05:00 Laurent C. <lrntct at gmail.com>:
> Hi Sören,
>
> Setting LD_LIBRARY_PATH is working, thanks. But it cannot be set at
> run-time, which is not very user-friendly.
> I guess this issue is related to the ticket 2424 [1].
>
> I managed to get it work at run-time by restarting the program with
> sys.execv() after setting the path [2], but I find it a bit ugly and
> quite verbose to be multi-platform.
>
> It would be great if an easier option was possible.
>
> Regards,
> Laurent
>
> [1] https://trac.osgeo.org/grass/ticket/2424
> [2] http://stackoverflow.com/questions/6543847/setting-ld-library-path-from-inside-python
>
>
> 2016-09-21 15:40 GMT-05:00 Sören Gebbert <soerengebbert at googlemail.com>:
>> Hi,
>> i think you have to put the GRASS libraries into your LD_LIBRARY_PATH so
>> that the python wrapper can access them.
>>
>> Best regards
>> Soeren
>>
>> 2016-09-21 20:37 GMT+02:00 Laurent C. <lrntct at gmail.com>:
>>>
>>> Hello all,
>>>
>>> I'm trying to adapt a python module in order for it to be run outside of
>>> GRASS.
>>> I followed the instructions from the wiki and lib/python/script/setup.py
>>>
>>> gsetup.init() run without error and I can list maps like in the example.
>>>
>>> However, when I try to import the temporal module, I receive this error:
>>>
>>> import grass.temporal as tgis
>>>   File "/usr/lib/grass70/etc/python/grass/temporal/__init__.py", line
>>> 1, in <module>
>>>     from core import *
>>>   File "/usr/lib/grass70/etc/python/grass/temporal/core.py", line 38,
>>> in <module>
>>>     from c_libraries_interface import *
>>>   File
>>> "/usr/lib/grass70/etc/python/grass/temporal/c_libraries_interface.py",
>>> line 19, in <module>
>>>     import grass.lib.gis as libgis
>>>   File "/usr/lib/grass70/etc/python/grass/lib/gis.py", line 23, in
>>> <module>
>>>     _libs["grass_gis.7.0.4"] = load_library("grass_gis.7.0.4")
>>>   File "/usr/lib/grass70/etc/python/grass/lib/ctypes_loader.py", line
>>> 55, in load_library
>>>     return self.load(path)
>>>   File "/usr/lib/grass70/etc/python/grass/lib/ctypes_loader.py", line
>>> 71, in load
>>>     raise ImportError,e
>>> ImportError: libgrass_datetime.7.0.4.so: cannot open shared object
>>> file: No such file or directory
>>>
>>>
>>> Did I forgot to set-up something or this is a bug?
>>>
>>> Cheers,
>>> Laurent
>>> _______________________________________________
>>> grass-dev mailing list
>>> grass-dev at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/grass-dev
>>
>>