Disallow user python site-packages

[pinkwah]

Komodo uses a vanilla Python interpreter, which by defaults adds ~/.local/lib/pythonX.Y/site-packges to sys.path, overriding stuff from Komodo. This will cause us headaches, such as user pip install --user a package, never updates it. We add this package to Komodo, user complains when everything breaks.

This already broke komodoenv for me, because I have an incompatible version of virtualenv in my .local/lib/pythonX.Y/site-packages. If any users expect Komodo to work like this, then we should inform them that they are doing it wrong.

Jonas' virtualenv approach already has breaking changes wrt. this: virtualenv explicitly does not add user site-packages. Depending on how long we'll keep shipping our own python binaries, we should consider disabling user site-packages via compile-flags.

Tagging @markusdregi @jondequinor and then running away to 🏖️ .

[jondequinor]

I somewhat agree. But I cannot find any relevant compile flags. What did you have in mind? python -s disables it runtime, but I can't find any compile time options.

On the other hand, the user is free to do what it wants.