[BUG] Editable wheel match import paths that are not theirs

[proto3]

setuptools version

65.2.0

Python version

3.10.6

OS

Ubuntu 20.04

Additional environment information

No response

Description

I'm currently working with two packages having names beginning the same, let's call them foo and foobar for example.
I install both of them using pip install -e, and both can be imported normally:

#!/usr/bin/env python
import foo
import foobar

Now I add a module bar in the foo package, so I can import foo, foobar and foo.bar
But importing foobar now always result in importing foo.bar

#!/usr/bin/env python
import foobar # PROBLEM this actually import foo.bar

Expected behavior

Importing foobar should never result in importing foo.bar instead.

How to Reproduce

#├── project1
#│   ├── foo
#│   │   ├── bar
#│   │   │   └── __init__.py
#│   │   └── __init__.py
#│   ├── pyproject.toml
#│   └── setup.cfg
#│
#├─ project2
#│   ├── foobar
#│   │   └── __init__.py
#│   ├── pyproject.toml
#│   └── setup.cfg

# Commands to reproduce the same layout
mkdir -p project1/foo/bar
mkdir -p project2/foobar
touch project1/pyproject.toml 
touch project1/pyproject.toml
touch project1/setup.cfg
touch project1/setup.cfg
echo print\(\"Hello from foo\"\) > project1/foo/__init__.py
echo print\(\"Hello from foo.bar\"\) > project1/foo/bar/__init__.py
echo print\(\"Hello from foobar\"\) > project2/foobar/__init__.py

# Commands to reproduce the error
pip install -e project1
pip install -e project2
python
>>> import foobar
Hello from foo.bar # ERROR it should be foobar, not foo.bar

Output

pip install -e project1
pip install -e project2
python
>>> import foobar
Hello from foobar # This is what we expect

[proto3]

With debugger I can see the moment when foo.bar is chosen in place of foobar:

setuptools/setuptools/command/editable_wheel.py

Line 761 in e551496

if fullname.startswith(pkg):

When fullname is "foobar" and pkg is "foo", it enter the if while it should not.

Using if fullname.split(".")[0] == pkg: instead would fix the problem by only comparing pkg to the first path item.

[abravalheri]

Thank you very much for reporting this @proto3, I am working on a PR.

[proto3]

This was so fast 😃
I can already use the new release, thanks a lot !

[abravalheri]

This was so fast 😃

The reporting was excellent, it helped a lot! Thank you.