pip defining wrong entry point versions on python 2.7

[Anthchirp]

Environment

• pip version: 9.0.3, 10.0.1
• Python version: 2.7.15
• OS: Linux, RHEL Workstation 6.9 (system python == 2.6.6, no python3)

Description
On installation on Python 2.7 pip creates console scripts pip, pip2, pip2.7.
However pip defines console_scripts pip, pip3, pip3.6 in entry_points.txt

Expected behavior
pip should define console_scripts entry points pip, pip2, pip2.7

How to Reproduce

1. Download Python2.7.15.tgz
2. Run configure with --with-ensurepip=install, make, make install
3. In installation directory run

./python -c "import pkg_resources; print(', '.join(
    pkg_resources.get_distribution('pip').get_entry_map()['console_scripts']))"

4. Output is: pip, pip3.6, pip3
5. File lib/python2.7/site-packages/pip-9.0.3.dist-info/entry_points.txt contains:

[console_scripts]
pip = pip:main
pip3 = pip:main
pip3.6 = pip:main

6. ./python -m pip install --upgrade pip
7. Rerun command to list entry points. Output still is pip, pip3.6, pip3
8. File lib/python2.7/site-packages/pip-10.0.1.dist-info/entry_points.txt contains:

[console_scripts]
pip = pip._internal:main
pip3 = pip._internal:main
pip3.6 = pip._internal:main

[RonnyPfannschmidt]

pip/setup.py

Lines 77 to 80 in 1335eba

	"console_scripts": [
	"pip=pip._internal:main",
	"pip%s=pip._internal:main" % sys.version[:1],
	"pip%s=pip._internal:main" % sys.version[:3],

is at fault

i have no idea why it even is added, its always wrong

[RonnyPfannschmidt]

wow, added in 37d1bf3 almost a decade back

[pradyunsg]

Indeed.

This isn't right... pip's wheel metadata would be incorrect then. Seems like a packaging bug.

[pradyunsg]

@pypa/pip-committers Any suggestions here? Is this something that acts as another reason for #3164?

[pfmoore]

The relevant code is at https://github.com/pypa/pip/blob/master/src/pip/_internal/wheel.py#L404 - this generates the versioned wrappers for pip, ignoring the entry point values.

IMO, setup.py should just say

 "console_scripts": [ "pip=pip._internal:main" ]

#3164 is IMO more about removing the wheel.py code I referenced above.

[pradyunsg]

Ah okay... IIUC, just updating setup.py would be enough for this issue?

[pfmoore]

Yep, I think so

[pradyunsg]

This seems more complex than just removing the two entries (see https://travis-ci.org/pypa/pip/builds/401602524) and I don't have the bandwidth to look into this currently.

I'm also pushing this down the road to the next release since I don't think this would happen in time for 18.0. PRs are welcome for this though. :)

[pradyunsg]

Pushing this down the road to the next release since I don't think this'd happen in time for 18.1.

If someone else does take a look, we'd probably need a PR to be merged by 30th Sept for this to make it into 18.1.

[hugovk]

Can this be closed now Python 2.7 support is being dropped (#6148)?

[Anthchirp]

Yep, I don't have a stake in this any more.