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

[David Marteau]

Hi Alessandro

I have found the problem, qgis packaging on buster is totally broken: it mixes 3.6.0 and 3.6.1 dependencies

If you try to install  python-qgis you get the following packages installed:

ii  libqgis-3d3.6.0                         1:3.6.0+15buster            amd64        QGIS - shared 3d library
ii  libqgis-analysis3.6.0                   1:3.6.0+15buster            amd64        QGIS - shared analysis library
ii  libqgis-core3.6.0                       1:3.6.0+15buster            amd64        QGIS - shared core library 
ii  libqgis-core3.6.1                       1:3.6.1+15buster            amd64        QGIS - shared core library
ii  libqgis-customwidgets                   1:3.6.1+15buster            amd64        QGIS custom widgets for Qt Designer
ii  libqgis-gui3.6.0                        1:3.6.0+15buster            amd64        QGIS - shared gui library
ii  libqgis-gui3.6.1                        1:3.6.1+15buster            amd64        QGIS - shared gui library
ii  libqgis-native3.6.0                     1:3.6.0+15buster            amd64        QGIS - shared native gui library
ii  libqgis-native3.6.1                     1:3.6.1+15buster            amd64        QGIS - shared native gui library
ii  libqgis-server3.6.0                     1:3.6.0+15buster            amd64        QGIS - shared server library
ii  libqgispython3.6.0                      1:3.6.0+15buster            amd64        QGIS - shared Python library
ii  python-qgis                             1:3.6.0+15buster            amd64        Python bindings to QGIS
ii  python-qgis-common                      1:3.6.0+15buster            all          Python bindings to QGIS - architecture-independent files

Packages are installed twice in both version 3.6.0 and 3.6.1 !!!!!

This lead to very unpredictible behavior when using qgis in python (simply not working or crashing randomly)


David,

> Le 26 mars 2019 à 18:38, David Marteau <dmarteau at 3liz.com> a écrit :
> 
> 
> 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 <mailto: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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