Drop ez_setup.py as a bootstrapping technique. Ref #581.

Author: jaraco

.travis.yml

@@ -1,14 +1,2 @@
-language: python
-python:
-  - 2.6
-  - 2.7
-  - 3.3
-  - 3.4
-  - 3.5
-  - pypy
-  - pypy3
-env:
- - ""
- - LC_ALL=C LC_CTYPE=C
 script:
- - py.test --flakes
+ - touch ez_setup.py

ez_setup.py

@@ -1,65 +1,3 @@
 #!/usr/bin/env python
 
-"""
-Setuptools bootstrapping installer, reliant on pip and providing
-nominal compatibility with the prior interface.
-
-Maintained at https://github.com/pypa/setuptools/tree/bootstrap.
-
-Don't use this script. Instead, just invoke pip commands to install
-or update setuptools.
-"""
-
-import sys
-import warnings
-
-
-def use_setuptools(version=None, **kwargs):
-    """
-    A minimally-compatible version of ez_setup.use_setuptools
-    """
-    if kwargs:
-        msg = "ignoring arguments: {keys}".format(keys=list(kwargs.keys()))
-        warnings.warn(msg)
-
-    requirement = _requirement(version)
-    _pip_install(requirement)
-
-    # ensure that the package resolved satisfies the requirement
-    __import__('pkg_resources').require(requirement)
-
-
-def download_setuptools(*args, **kwargs):
-    msg = (
-        "download_setuptools is no longer supported; "
-        "use `pip download setuptools` instead."
-    )
-    raise NotImplementedError(msg)
-
-
-def _requirement(version):
-    req = 'setuptools'
-    if version:
-        req += '>=' + version
-    return req
-
-
-def _pip_install(*args):
-    args = ('install', '--upgrade') + args
-    __import__('pip').main(list(args))
-
-
-def _check_sys_argv():
-    if not sys.argv[1:]:
-        return
-
-    msg = (
-        "parameters to ez_setup are no longer supported; "
-        "invoke pip directly to customize setuptools install."
-    )
-    raise NotImplementedError(msg)
-
-
-if __name__ == '__main__':
-    _check_sys_argv()
-    raise SystemExit(_pip_install('setuptools'))
+raise NotImplementedError("ez_setup is deprecated; use pip to bootstrap")