Can't use adhoc_tool with workspace

[mnowotnik]

Describe the bug
Attempts to run a target with adhoc_tool with environment="__local_workspace__" crash.

Error:

python3.9: can't open file '/Users/michalnowotnik/Projects/pants-poc/./pex': [Errno 2] No such file or directory

Pants version
2.24.0.rc0

OS
Just checked MacOS.

Additional info
Minimal example: https://github.com/mnowotnik/pants-poc

[cburroughs]

Thanks for the detailed bug report and example repo! Is there prior version of Pants this example does work with?

[mnowotnik]

From 2.22.0 (when workspace was introduced) to 2.23.1 it gives error:

and for 2.24.0.rc0 and 2.25.0.dev3 it gives error:

python3.9: can't open file '/Users/michalnowotnik/Projects/pants-poc/./pex': [Errno 2] No such file or directory

So effectively no regression, just different error.

[mnowotnik]

find_interpreter from pex.py appears to be running in non-sandboxed environment for some reason. Strange, because it's not actually running the code, but only calculating python exec hash.
Without __local_environment__ it runs in sandbox with the following files:

❯ ls -a  /private/var/folders/tf/7pgqpxt9281gc29h16pt78380000gp/T/pants-sandbox-VSk5zW
.				..				.cache				.python-build-standalone	.tmp				__run.sh			pex