Feature request: richer environment-variable handling

[dstndstn]

Hi,

1. Is there a way to CLEAR an environment variable? Eg, I want to do the equivalent of unset PYTHONPATH -- PYTHONPATH is set in my shell environment and I don't want that variable to be set inside my shifter environment.
2. It would be nice to be able to clear everything except for a specified list of environment variables -- for example, I want to do --clearenv except I need to pass in Slurm variables to actually allow a shifter-in-srun job to work. (I guess I could do this with a careful shell script, creating a separate --env-file for each srun task)

[scanon]

Sorry for not responding. In case you are still wondering. The best option right now would be something like...

shifter -E -e FOO=$FOO -e BAR=$BAR --image=alpine sh