`sys.orig_argv` is not original, at least on some systems

[pkit]

In an OSX .venv the "original" sys.orig_argv is not really original...

(.venv) % cat orig.py
import sys

print(sys.orig_argv)

(.venv) % python orig.py 
['/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/Resources/Python.app/Contents/MacOS/Python', 'orig.py']

(.venv) % which python
/Users/user/git/project/.venv/bin/python

I can use os.environ["_"] but it's a workaround.

[vstinner]

I cannot reproduce the issue on Linux.

$ python3 -m venv env
$ env/bin/python -c 'import sys; print(sys.orig_argv[0])'
env/bin/python

$ source env/bin/activate
(env) $ python -c 'import sys; print(sys.orig_argv[0])'
python

(env) $ which python
~/env/bin/python
(env) $ ls -l env/bin/python
lrwxrwxrwx 1 vstinner vstinner 7  5 oct.  22:31 env/bin/python -> python3*
(env) $ ls -l env/bin/python3
lrwxrwxrwx 1 vstinner vstinner 16  5 oct.  22:31 env/bin/python3 -> /usr/bin/python3*

You can also have a look at:

(env) vstinner@mona$ python
>>> import sys
>>> sys.executable
'/home/vstinner/env/bin/python'
>>> sys._base_executable
'/usr/bin/python3.12'

[pkit]

Yup. As I've said it's probably OSX-specific

This one is inside venv:

% python -c 'import sys; print(sys.orig_argv[0])'
/opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/Resources/Python.app/Contents/MacOS/Python

% python -c 'import sys; print(sys.executable, sys._base_executable)'
/Users/user/git/project/.venv/bin/python /opt/homebrew/Cellar/python@3.11/3.11.10/Frameworks/Python.framework/Versions/3.11/bin/python3.11

[pkit]

sys.executable works well on both Linux and OSX
So, to correctly re-exec in a cross-platform way:

os.execve(sys.executable, sys.orig_argv, os.environ.copy())

[JacobCoffee]

here's my side

Details

~ on ☁  (us-east-2)
➜ ntp 125006
Directory /tmp/testing/125006 created and switched to.

/tmp/testing/125006 on ☁  (us-east-2)
➜ python3 -m venv venv

/tmp/testing/125006 on ☁  (us-east-2) took 2s
➜ env/bin/python -c 'import sys; print(sys.orig_argv[0])'^C

/tmp/testing/125006 on ☁  (us-east-2) took 2s
➜ ./venv/bin/python -c 'import sys; print(sys.orig_argv[0])'
./venv/bin/python

/tmp/testing/125006 on ☁  (us-east-2)
✗ source venv/bin/activate.fish

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ which python
/private/tmp/testing/125006/venv/bin/python

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ ls -l venv/bin/python
lrwxr-xr-x@ - coffee 10 Oct 15:59 venv/bin/python -> python3

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ ls -l venv/bin/python3
lrwxr-xr-x@ - coffee 10 Oct 15:59 venv/bin/python3 -> /Users/coffee/.local/share/mise/installs/python/3.12/bin/python3

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ ./venv/bin/python -c 'import sys; print(sys.orig_argv[0])'

./venv/bin/python

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ python -c 'import sys; print(sys.executable, sys._base_executable)'
/private/tmp/testing/125006/venv/bin/python3 /Users/coffee/.local/share/mise/installs/python/3.12/bin/python3.12

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ python -c 'import sys; print(sys.orig_argv[0])'
        python3

/tmp/testing/125006 via  pyenv (venv) on ☁  (us-east-2)
➜ python -c 'import sys; print(sys.orig_argv[0])'
python