[BUG] Running with --prefix leads to expected str, bytes or os.PathLike object, not NoneType #4966
Description
setuptools version
80.0.0
Python version
3.12
OS
Ubuntu 22.04
Additional environment information
No response
Description
Using python setup.py develop with --prefix results in an error:
TypeError: expected str, bytes or os.PathLike object, not NoneType
Due to https://github.com/pypa/setuptools/blob/main/setuptools/command/develop.py#L37
+ ['--index-url', self.index_url] * bool(self.prefix) resolves to ['--index-url', None]
Expected behavior
python setup.py develop --prefix ~/.local should not crash
How to Reproduce
Run python setup.py develop --prefix ~/.local with setuptools==80 on a repo that is using setuptools, such as https://github.com/ROCm/vllm
Output
Traceback (most recent call last): File "/root/vllm/setup.py", line 678, in <module> setup( File "/usr/local/lib/python3.12/dist-packages/setuptools/__init__.py", line 117, in setup return distutils.core.setup(**attrs) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/dist-packages/setuptools/_distutils/core.py", line 186, in setup return run_commands(dist) ^^^^^^^^^^^^^^^^^^ File "/usr/local/lib/python3.12/dist-packages/setuptools/_distutils/core.py", line 202, in run_commands dist.run_commands() File "/usr/local/lib/python3.12/dist-packages/setuptools/_distutils/dist.py", line 1002, in run_commands self.run_command(cmd) File "/usr/local/lib/python3.12/dist-packages/setuptools/dist.py", line 1104, in run_command super().run_command(command) File "/usr/local/lib/python3.12/dist-packages/setuptools/_distutils/dist.py", line 1021, in run_command cmd_obj.run() File "/usr/local/lib/python3.12/dist-packages/setuptools/command/develop.py", line 39, in run subprocess.check_call(cmd) File "/usr/lib/python3.12/subprocess.py", line 408, in check_call retcode = call(*popenargs, **kwargs) ^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/subprocess.py", line 389, in call with Popen(*popenargs, **kwargs) as p: ^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/usr/lib/python3.12/subprocess.py", line 1026, in __init__ self._execute_child(args, executable, preexec_fn, close_fds, File "/usr/lib/python3.12/subprocess.py", line 1885, in _execute_child self.pid = _fork_exec( ^^^^^^^^^^^ TypeError: expected str, bytes or os.PathLike object, not NoneType