[Bug 216953] devel/py-setuptools: egg_info fails under python 3.4.6 on nonexistent MANIFEST graft

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=216953

            Bug ID: 216953
           Summary: devel/py-setuptools: egg_info fails under python 3.4.6
                    on nonexistent MANIFEST graft
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: python at FreeBSD.org
          Reporter: john at saltant.com
          Assignee: python at FreeBSD.org
             Flags: maintainer-feedback?(python at FreeBSD.org)

Created attachment 179814
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=179814&action=edit
Terminal capture showing passing and failing examples

When the MANIFEST.in file contains a graft statement that refers to a directory
that does not exist, the egg_info command will fail when run under python
3.4.6.

Expected behavior:

    setuptools warns on the nonexistent directory

Observed behavior:

    setuptools exits with an error on the nonexistent directory due to an
unhandled `FileNotFoundError` exception

How to reproduce:

    export DISTUTILS_DEBUG=yes
    echo "graft nope" > MANIFEST.in
    python3.4 \
        -c "from setuptools import setup; setup(name='x', version='0.1.0')" \
        sdist

See the attached sample output comparing output between `distutils.core.setup`
and `setuptools.setup` across all versions of python currently supported on
FreeBSD. Only the combination of `setuptools` with python 3.4.6 exhibit this
problem.

N.B. I believe the underlying problem is where `setuptools.commands.egg_info`
uses `distutils.filelist.findall`. I chose to demonstrate the problem with the
sdist command because that is the only `distutils` command that uses
`distutils.filelist.findall`.

See some background on this bug on the freebsd-python list [0].

[0] https://lists.freebsd.org/pipermail/freebsd-python/2017-January/011524.html

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