setting an environment variable

[Martin Genet]

Hi all,

I'm trying to set an environment variable in a conda environment file. I need something like $CPATH = $CONDA_PREFIX/include/vtk-9.0.
I followed https://docs.conda.io/projects/conda/en/latest/user-guide/tasks/manage-environments.html#setting-environment-variables and tried the following minimal yml:

name: test
variables:
     CPATH: $CONDA_PREFIX/include/vtk-9.0

But unfortunately $CONDA_PREFIX is no substituted. Does anyone know how to do this? Thank you!

Martin

[David Kun]

Hopefully, you've already figured this out.  It appears that setting the environment variable within a conda environment differs if you're on Linux or Windows.

For Windows, this snippet of commands worked for me

(test-env) C:\Users\aaa>conda activate test-env

(test-env) C:\Users\aaa>conda env config vars list

(test-env) C:\Users\aaa>conda env config vars set CPATH=%CONDA_PREFIX%\include\vtk-9.0
To make your changes take effect please reactivate your environment

(test-env) C:\Users\aaa>conda activate test-env

(test-env) C:\Users\aaa>conda env config vars list
CPATH = C:\Users\aaa\miniconda3\envs\test-env\include\vtk-9.0

For Linux (I'm using CentOS VM),

(test-env) [vagrant@localhost ~]$ conda env config vars list

(test-env) [vagrant@localhost ~]$ conda env config vars set CPATH=$CONDA_PREFIX/include/vtk-9.0

To make your changes take effect please reactivate your environment

(test-env) [vagrant@localhost ~]$ conda activate test-env

(test-env) [vagrant@localhost ~]$ conda env config vars list

CPATH = /home/vagrant/.conda/envs/test-env/include/vtk-9.0

I hope that I understood the problem and the above snippets helps.

[Martin Genet]

Thank you David.

I tried to do it through the yml file, but it did not work so well.

Defining them using conda env config vars set is definitely the way to go, even though it is one more line than my students have to run.

Thanks again!

Martin

[Ray Donnelly]

You need to use an activation script

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