[Qgis-user] Determining QGIS version on command line

[Jorge Gustavo Rocha]

Hi Steve,

qgis --version works as expected (tested in Linux). Can you test on
Windows, please?

Regards,

Jorge Gustavo

On 27/03/20 04:29, Steve Malers wrote:
> QGIS list:
>
> I have tried to find the answer for this and hope the user community
> can help.  I need a robust and consistent way to determine the QGIS
> version on the command line that I can call from a bat file on Windows
> (and similar on Linux), something like:  qgis-bin.exe --version
>
> Background:  I am developing a complex Python tool that uses PyQGIS
> and PyQt and is distributed as a virtual environment (venv) created
> using a specific version of QGIS Python, for example QGIS 3.10
> python37.  The deployed environment requires that QGIS is installed
> separately  The run script modifies its PYTHONPATH to include packages
> for PyQGIS and the application. The venv includes a text file that
> indicates the QGIS version that the venv was built with and verifies
> that a compatible QGIS is installed.  The run script properly handles
> the typical case where stand-alone QGIS is installed because it looks
> at the file path, such as C:\Program Files\QGIS 3.10.  If it finds a
> match, then that version of QGIS is used in PYTHONPATH and the
> application starts OK.
>
> The problem is that if someone has not installed a stand-alone QGIS
> but has installed OSGeo464 version (C:\OSGeo4W64), there is no
> indicator of QGIS version in the installation folder.   I cannot find
> documentation for qgis-bin.exe command line options and experiments
> did not show support for --version or variants.  I could scrape the
> QGIS version from files somewhere in the distribution but looking into
> the code it seems to get complicated due to handoff from Python to
> C/C++ code.  If I can determine the version I can check to make sure
> that the OsGeo4W64 QGIS version matches that of the distributed venv. 
> Lacking this, the run script cannot do the check.  Supporting
> OSGeo4W64 is needed because some development and deployed environments
> use it.  My plan B is to write a simple Python program to access the
> version from the Python side, making general assumptions to get
> started, and then configure the main application startup.
>
> Any help would be appreciated.
>
> -- 
> Steve Malers
> Chief Executive Officer and Chief Technology Officer
> Open Water Foundation
> openwaterfoundation.org <http://openwaterfoundation.org>
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