Commands fail after installing and launching xonsh

[indexthm]

xonsh is a Python-powered shell. I installed it via pip in a-Shell on iPad, and it installs and starts successfully. However, once inside xonsh, running any command such as ls immediately fails.
The error I get is:

Fatal Python error: PyMutex_Unlock: unlocking mutex that is not locked
Python runtime state: initialized
Traceback (most recent call last):
  File "/var/mobile/Containers/Data/Application/249E10F6-268D-440D-8856-1F4A2796B5AB/Library/lib/python3.13/site-packages/xonsh/procs/specs.py", line 292, in no_pg_xonsh_preexec_fn
    os.setpgrp()
    ^^^^^^^^^^
AttributeError: module 'os' has no attribute 'setpgrp'. Did you mean: 'getpgrp'?

It looks like os.setpgrp() is unavailable in a-Shell’s Python environment on iPadOS. Is this a fundamental platform limitation, or could a compatibility fix be possible?

[holzschu]

The short answer is: "it's a fundamental platform limitation" (setpgrp sets the process group for a process. iOS does not have real process, has only one group accessible to the user anyway, and does not allow changing group for a process).

I have tried xonsh myself once or twice. It breaks in multiple places (once you "fix" that one, there's another one, and another one...) Basically it assumes that you have a full Unix environment with process and everything, which is not the case on iOS.