Vendor pkg_resources

[dstufft]

This vendors pkg_resources which means that there is no longer a hard check on setuptools version and infract pip can install things perfectly fine without setuptools installed as long as it's only installing Wheels.

[pfmoore]

zipping up pip and the main.py I quoted in #1422 ever-so-nearly works as a portable, standalone pip:

>virtualenv --no-setuptools xx
Using real prefix 'C:\\Apps\\Python33'
New python executable in xx\Scripts\python.EXE
(ve) PS 13:08 C:\Work\personal
>xx\scripts\python .\pip\pip.zip list
(ve) PS 13:08 C:\Work\personal
>xx\scripts\python .\pip\pip.zip install setuptools
Downloading/unpacking setuptools
Installing collected packages: setuptools
Cleaning up...
Exception:
Traceback (most recent call last):
  File ".\pip\pip.zip\pip\basecommand.py", line 122, in main
    status = self.run(options, args)
  File ".\pip\pip.zip\pip\commands\install.py", line 275, in run
    requirement_set.install(install_options, global_options, root=options.root_path)
  File ".\pip\pip.zip\pip\req.py", line 1373, in install
    requirement.install(install_options, global_options, *args, **kwargs)
  File ".\pip\pip.zip\pip\req.py", line 655, in install
    self.move_wheel_files(self.source_dir, root=root)
  File ".\pip\pip.zip\pip\req.py", line 886, in move_wheel_files
    pycompile=self.pycompile,
  File ".\pip\pip.zip\pip\wheel.py", line 324, in move_wheel_files
    generated.extend(maker.make(spec))
  File ".\pip\pip.zip\pip\_vendor\distlib\scripts.py", line 304, in make
    self._make_script(entry, filenames, options=options)
  File ".\pip\pip.zip\pip\_vendor\distlib\scripts.py", line 208, in _make_script
    self._write_script(scriptnames, shebang, script, filenames, ext)
  File ".\pip\pip.zip\pip\_vendor\distlib\scripts.py", line 150, in _write_script
    launcher = self._get_launcher('t')
  File ".\pip\pip.zip\pip\_vendor\distlib\scripts.py", line 283, in _get_launcher
    result = finder(distlib_package).find(name).bytes
AttributeError: 'NoneType' object has no attribute 'bytes'

Storing debug log for failure in C:\Users\uk03306\pip\pip.log

That latter looks like a distlib issue. I'll post it to the distlib tracker for comments (it's not a huge deal in the grand scheme of things, though).

[dstufft]

FWIW I'd prefer to keep any changes to make this run as a zip file to the develop branch. It's kind of a stretch to add this to 1.5.1 since it's technically a new feature but I think unbreaking things for people who are using a system installed setuptools calls for the exception. But adding a feature that isn't needed for unbreaking things should go back to develop.

[pfmoore]

Agreed - no intention that the run-in-a-zip-file stuff be for 1.5.1. I was just curious as to how close it was to working.

[dstufft]

This should be done now, letting the tests pass.

[qwcode]

YAY!!!!

[qwcode]

I think this should be import setuptools?

just noticed an interesting situation on ubuntu-precise
ubuntu has a python-pkg-resources pkg, seperate from setuptools.
so import pkg_resources works, but there's no setuptools, so I end up failing later with a different exception than yours.

[dstufft]

You're probably right. I just adapted this from the old check and didn't really think about it.