[QGIS-Developer] Qgis 3.6.0 fail to read shapefile with python on buster

[David Marteau]

Hi Alessandro

No there is nothing at all in the logs.

I have used the same reduced snippet on qgis 3.4.5 (ltr) on Stretch and qgis 3.6.0 (release) on buster, using the same datasource:

```
import os
from qgis.core import QgsApplication, QgsVectorLayer

# prevent display not found error
os.environ['QT_QPA_PLATFORM'] = 'offscreen'

qgis_application = QgsApplication([], False )
layer = QgsVectorLayer('path/to/data')

layer.isValid() # Return True on 3.4.5/stretch, False on 3.6.0/buster whatever the data
```

If the release package has not been updated in the previous  24 h, I suspect that something has been broken on the buster distro.

Note that I'm able to load shapefile in python with ogr (gdal-python).


> Le 26 mars 2019 à 17:47, Alessandro Pasotti <apasotti at gmail.com> a écrit :
> 
> 
> On Tue, Mar 26, 2019 at 5:45 PM David Marteau <dmarteau at 3liz.com <mailto:dmarteau at 3liz.com>> wrote:
> 
> The situation seems to be worst: it seems that no layers can be read from python whatever the format.
> 
> 
>> Le 26 mars 2019 à 17:38, David Marteau <dmarteau at 3liz.com <mailto:dmarteau at 3liz.com>> a écrit :
>> 
>> Hi devs,
>> 
>> We use to build docker images of the latest qgis releases and we have a regression  affecting version 3.6.0 official release on buster
>> 
>> Qgis: 3.6.0 on Debian
>> 
>> If we read a layer with python:
>> 
>>> layer = QgsVectorLayer('./mydata.shp')
>> 
>> Then the layer is invalid (no warning, no errors)
>> 
>> Doing the same thing on stretch + Qgis 3.4.5 (ltr) with same data work flawlessly and lead to a valid layer.
>> 
>> This was not affecting previous build 24 h ago (release end nightly-release)
>> 
>> The tests were based with shapefiles from testdata in qgis sources.
>> 
>> We are not sure it that come from Qgis itself or from a change on the distribution.
>> 
>> David,
>> 
> 
> 
> Hi David,
> 
> anything in the logs?
> 
> I would check QGIS_PREFIX_PATH env var, and make sure the provider libraries are found and loaded.
> 
> 
> -- 
> Alessandro Pasotti
> w3:   www.itopen.it <http://www.itopen.it/>
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