shebang rewrite in installed scripts do not respect extra args passed to the interpreter

[mayeut]

Summary

e.g. a script in the wheel looks like:

#!python -E
import sys


from cmake import cpack

if __name__ == '__main__':
    if sys.argv[0].endswith('-script.pyw'):
        sys.argv[0] = sys.argv[0][: -11]
    elif sys.argv[0].endswith('.exe'):
        sys.argv[0] = sys.argv[0][: -4]

    sys.exit(cpack())

The script gets installed as:

#!/bin/sh
'''exec' '/private/var/folders/hb/2n_7f3yn20v06lzz3129dtw80000gn/T/cibw-run-sz3abzyq/cp39-macosx_universal2/venv-test-x86_64/bin/python3' "$0" "$@"
' ''' -E

import sys


from cmake import cpack

if __name__ == '__main__':
    if sys.argv[0].endswith('-script.pyw'):
        sys.argv[0] = sys.argv[0][: -11]
    elif sys.argv[0].endswith('.exe'):
        sys.argv[0] = sys.argv[0][: -4]

    sys.exit(cpack())

The -E argument is not being written where it should be.
pip installing the same wheel creates a working script.
The spec is unclear but the assumption in pip (or maybe distutils) is that arguments present behind the interpreter shall be left untouched (i.e. not removed).

Platform

macOS 15

Version

uv 0.7.19

Python version

Python 3.12.10

[charliermarsh]

Seems reasonable to preserve if we can.

[charliermarsh]

I just used pip install for a wheel containing this script:

#!python -E
import sys
print("Python executable:", sys.executable)
print("Arguments:", sys.argv)
print("Environment isolated:", "-E" in sys.flags)

Here's the executable it put in my virtual environment:

#!/Users/crmarsh/workspace/uv/.venv/bin/python
import sys
print("Python executable:", sys.executable)
print("Arguments:", sys.argv)
print("Environment isolated:", "-E" in sys.flags)

Your comment suggests that pip retains these, but it looks like it doesn't?

[charliermarsh]

I've confirmed from the code that pip drops them, so going to do the same here.