[OSGeoLive] OSGeoLive Environment Variable

[Seth G]

Hi list,

It would be useful for a Python Notebook (or any demo application) to know if it is running on OSGeoLive in order to set paths to data etc. 

Looking at the current system environment variables I don't think there is something that would definitively declare a script is running on OSGeoLive. 

Setting an OSGEOLIVE variable to the version could be even more helpful e.g. "export OSGEOLIVE=14" (somewhere in https://github.com/OSGeo/OSGeoLive/tree/master/bin - although I'm not sure where). As noted in IRC from kalxas "we can add this to the bash profile of new users" - so maybe in https://github.com/OSGeo/OSGeoLive/blob/master/bin/setup.sh ?

"export OSGEOLIVE=true" or similar could be used if keeping version numbers updated is a problem. 

Then any demos could be multipurposed - running in cloud plus running on osgeolive and setting appropriate paths to data if that is the case. 

Seth

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