Is it possible to use $HOME or ~ in extra_env_vars?

Do you mean combine

$HOME

with another env var to create a value, like this?

FOO="${HOME}/bar"

yes

I do not think that's possibly currently, unfortunately. But you can propagate

HOME

, so I wonder if you can construct

FOO

in your Python code itself e.g. by changing

os.environ

?

yeah I definitely could, just trying to see if I can get pants build working without changing much of our apps

If you're using an absolute path, you technically can still open it. It is discouraged because it hurts reproducibility / Works On My Machine errors, will break if you ever use Remote Execution, and is not safe with caching if the file were to ever change. But, it is allowed Mind sharing what the use case is?

we use it for some encryption keys to access secrets