[Nix-dev] Running nix-shell commands as cron jobs

[Anders Lundstedt]

A python script I have depends on the requests2 package. I can run the
script using

nix-shell --pure -p python3 -p python3Packages.requests2 --run ./my-script.py


However when putting this line as a cron job I get the cron output:

error: Nix database directory ‘/nix/var/nix/db’ is not writable:
Permission denied


What solutions are there to run a simple script with dependencies as a
cron job, other than to add the script as a package?