[Qgis-user] Readonly gpkg

[Even Rouault]

> So it looks like qgis is also resetting the mode to delete, or perhaps
> GDAL is doing that.   I haven't found that in the sources so far.

Both attempt at doing this:

- QGIS at 
https://github.com/qgis/QGIS/blob/master/src/core/providers/ogr/qgsogrproviderutils.cpp#L1172 
to #L1230 when it closes the last connection instance of a GPKG file

- and OGR too : 
https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/sqlite/ogrsqlitedatasource.cpp#L367


Probably the most reasonable & simple change for QGIS would be turn WAL 
only when QGIS update mode is turned on. Would require testing that 
deadlocks don't occur with existing readers prior to turning WAL on (or 
accept that risk...)


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