ShellDetectionFailure for zsh

[pmeier]

Not sure what is going on here:

❯ echo $SHELL
/usr/bin/zsh
❯ /usr/bin/zsh --version
zsh 5.9 (x86_64-pc-linux-gnu)
❯ python -c 'import shellingham; shellingham.detect_shell()'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/philip/.conda/envs/ora-dev/lib/python3.11/site-packages/shellingham/__init__.py", line 24, in detect_shell
    raise ShellDetectionFailure()
shellingham._core.ShellDetectionFailure
❯ python -c 'import shellingham; print(shellingham.__version__)'
1.5.1

[uranusjr]

It would be best if you could do some digging since it’s close to impossible to replicate your exact environment. There is no way I can help with just this information.

[pmeier]

It would be best if you could do some digging since it’s close to impossible to replicate your exact environment.

Will do and get back to you.

There is no way I can help with just this information.

I couldn't find any information about what I should provide. Happy to oblige.

[pmeier]

It seems the detection fails, because it doesn't find any processes other than the current one:

❯ cat -p git/ora/foo.py
from shellingham import detect_shell

detect_shell()
❯ python git/ora/foo.py
detect_shell(): impl=<module 'shellingham.posix' from '/home/philip/.conda/envs/ora-dev/lib/python3.11/site-packages/shellingham/posix/__init__.py'>
get_shell(): pid='7531', mapping={'7531': Process(args=('python', 'git/ora/foo.py'), pid='7531', ppid='34819')}
get_shell(): proc_args=('python', 'git/ora/foo.py')
Traceback (most recent call last):
  File "/home/philip/git/ora/foo.py", line 3, in <module>
    detect_shell()
  File "/home/philip/.conda/envs/ora-dev/lib/python3.11/site-packages/shellingham/__init__.py", line 25, in detect_shell
    raise ShellDetectionFailure()
shellingham._core.ShellDetectionFailure

[uranusjr]

Interesting. Can you describe your environment a bit? What operating system are you on, is there emulation involved (32-64 bit binaries, for example), a user that may have permission restrictions, or similar things? Try to dig into doing the process detection part manually as well, does the detection method (proc os ps?) really return only the current process, or is there a problem with parsing?

[pmeier]

Can you describe your environment a bit? What operating system are you on, is there emulation involved (32-64 bit binaries, for example)

No emulation. I'm directly on a x86_64 Arch Linux box.

a user that may have permission restrictions

Default user with sudo permissions.

the detection method (proc os ps?)

It is looking at /proc. I'm hitting shellingham.posix.proc.get_process_mapping.

[pmeier]

Something is off here. _get_stat returns ppid, tty

shellingham/src/shellingham/posix/proc.py

Line 51 in 0566a5f

return parts[LINUX_STAT_PPID], parts[LINUX_STAT_TTY]

but get_process_mapping unpacks it as

shellingham/src/shellingham/posix/proc.py

Line 78 in 0566a5f

tty, ppid = _get_stat(pid, stat_name)

[pmeier]

Yep, that seems to be it. Will send a PR.

[pmeier]

I see this is already fixed on master with 13aa99d and ultimately completely refactored with #75 that no longer uses the TTY at all. Can confirm that with 1.5.1 installed, my shell is correctly detected.

@uranusjr I see that 1.5.1 is yanked on PyPI. Any chance we can get a new release soon that includes the patches above?

[uranusjr]

The version was yanked due to an incompatibility. I attempted to address it and released 1.5.2.

[pmeier]

Can confirm that this particular issue is fixed in 1.5.2. Thanks!