conda-bug

# Create Conda env with ctng-compiler-activation package installed.
$ micromamba create -p /tmp/conda -c conda-forge --override-channels gcc_linux-64

# Set HOST as a *shell variable*.
$ HOST=whunk

# It's visible to the shell…
$ echo $HOST
whunk

# …but not part of the inherited environment (i.e. not exported).
$ python3 -c 'import os; print(os.environ.get("HOST"))'
None

# Activate the Conda environment, which sources the ctng-compiler-activation
# scripts, e.g. /tmp/conda/etc/conda/activate.d/activate-gcc.sh.
$ conda activate /tmp/conda

# The activation script sets HOST…
$ echo $HOST
x86_64-conda-linux-gnu

# …and exports it into the inherited environment.
$ python3 -c 'import os; print(os.environ.get("HOST"))'
x86_64-conda-linux-gnu

# Deactivate the Conda environment, which sources the ctng-compiler-activation
# scripts, e.g. /tmp/conda/etc/conda/deactivate.d/deactivate-gcc.sh.
$ conda deactivate

# The deactivation script restores the old HOST value…
$ echo $HOST
whunk

# …but leaves it exported into the inherited environment.
$ python3 -c 'import os; print(os.environ.get("HOST"))'
whunk