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 <apaso...@gmail.com> a écrit : > > > On Tue, Mar 26, 2019 at 5:45 PM David Marteau <dmart...@3liz.com > <mailto:dmart...@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 <dmart...@3liz.com >> <mailto:dmart...@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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