QGIS » QGIS Application

Opening a Vector Geopackage in QGIS alters its file. Simply loading the file is enough, you do not even need to load any actual data (visibly to the user).



<pre>

$ wget http://www.geopackage.org/data/geonames_belgium.gpkg

2017-01-13 17:58:54 (1.28 MB/s) - ‘geonames_belgium.gpkg’ saved [11594752/11594752]



$ cp geonames_belgium.gpkg geonames_belgium.gpkg_original



$ md5sum geonames_belgium.gpkg*



4dacf68ae3a5f2c2fb55a35d062dc580 geonames_belgium.gpkg

4dacf68ae3a5f2c2fb55a35d062dc580 geonames_belgium.gpkg_original



$ ogrinfo -so geonames_belgium.gpkg

INFO: Open of `geonames_belgium.gpkg'

using driver `GPKG' successful.

1: administrative (3D Measured Point)

2: hydrography (3D Measured Point)

3: leisure (3D Measured Point)

4: places (3D Measured Point)

5: roads (3D Measured Point)

6: spots (3D Measured Point)

7: terrain (3D Measured Point)

8: undersea (3D Measured Point)

9: vegetation (3D Measured Point)



$ md5sum geonames_belgium.gpkg*

4dacf68ae3a5f2c2fb55a35d062dc580 geonames_belgium.gpkg

4dacf68ae3a5f2c2fb55a35d062dc580 geonames_belgium.gpkg_original



hannes@hilmar:/mnt/earx/geodata$ qgis geonames_belgium.gpkg

Warning: loading of qgis translation failed [/usr/share/qgis/i18n//qgis_en_US]

Warning: loading of qt translation failed [/usr/share/qt/translations/qt_en_US]

Warning: QCss::Parser - Failed to load file "/style.qss"

</pre>



Here the layer chooser dialog appeared on which I clicked Cancel and quit QGIS.



<pre>

$ md5sum geonames_belgium.gpkg*

99fad69efe058b1d308088b96d60e915 geonames_belgium.gpkg

4dacf68ae3a5f2c2fb55a35d062dc580 geonames_belgium.gpkg_original

</pre>



QGIS changes only some stuff in the header:



<pre>

$ hexdump -C geonames_belgium.gpkg > geonames_belgium.gpkg.hex

$ hexdump -C geonames_belgium.gpkg_original > geonames_belgium.gpkg_original.hex

$ diff geonames_belgium.gpkg*.hex

2c2

< 00000010 04 00 01 01 00 40 20 20 00 00 00 56 00 00 2c 3b |.....@ ...V..,;|

---

> 00000010 04 00 01 01 00 40 20 20 00 00 00 54 00 00 2c 3b |.....@ ...T..,;|

6,7c6,7

< 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 56 |...............V|

< 00000060 00 2e 05 42 05 00 00 00 26 03 42 00 00 00 2c 3b |...B....&.B...,;|

---

> 00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 54 |...............T|

> 00000060 00 2d e6 06 05 00 00 00 26 03 42 00 00 00 2c 3b |.-......&.B...,;|

</pre>



I could not reproduce this bug with the Raster GPKG https://portal.opengeospatial.org/files/63156 but with any other Vector GPKG I tried.



Please ensure that merely opening a file does never alter it.