Revert "drop easy_install script and associated documentation"

This reverts commit 6e1838a9.

docs/index.txt

@@ -21,4 +21,5 @@ Documentation content:
    python3
    development
    roadmap
+   Deprecated: Easy Install <easy_install>
    history

easy_install.py

+"""Run the EasyInstall command"""
+
+if __name__ == '__main__':
+    from setuptools.command.easy_install import main
+    main()

setup.cfg

@@ -51,6 +51,7 @@ classifiers =
 [options]
 zip_safe = True
 python_requires = >=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*
+py_modules = easy_install
 packages = find:
 
 [options.packages.find]

setup.py

@@ -31,6 +31,22 @@ def read_commands():
     return command_ns['__all__']
 
 
+def _gen_console_scripts():
+    yield "easy_install = setuptools.command.easy_install:main"
+
+    # Gentoo distributions manage the python-version-specific scripts
+    # themselves, so those platforms define an environment variable to
+    # suppress the creation of the version-specific scripts.
+    var_names = (
+        'SETUPTOOLS_DISABLE_VERSIONED_EASY_INSTALL_SCRIPT',
+        'DISTRIBUTE_DISABLE_VERSIONED_EASY_INSTALL_SCRIPT',
+    )
+    if any(os.environ.get(var) not in (None, "", "0") for var in var_names):
+        return
+    tmpl = "easy_install-{shortver} = setuptools.command.easy_install:main"
+    yield tmpl.format(shortver='{}.{}'.format(*sys.version_info))
+
+
 package_data = dict(
     setuptools=['script (dev).tmpl', 'script.tmpl', 'site-patch.py'],
 )
@@ -109,6 +125,9 @@ setup_params = dict(
             "depends.txt = setuptools.command.egg_info:warn_depends_obsolete",
             "dependency_links.txt = setuptools.command.egg_info:overwrite_arg",
         ],
+        "console_scripts": list(_gen_console_scripts()),
+        "setuptools.installation":
+            ['eggsecutable = setuptools.command.easy_install:bootstrap'],
     },
     dependency_links=[
         pypi_link(

setuptools/command/easy_install.py

@@ -73,7 +73,7 @@ warnings.filterwarnings("default", category=pkg_resources.PEP440Warning)
 
 __all__ = [
     'samefile', 'easy_install', 'PthDistributions', 'extract_wininst_cfg',
-    'get_exe_prefixes',
+    'main', 'get_exe_prefixes',
 ]
 
 
@@ -2289,6 +2289,59 @@ def current_umask():
     return tmp
 
 
+def bootstrap():
+    # This function is called when setuptools*.egg is run using /bin/sh
+    import setuptools
+
+    argv0 = os.path.dirname(setuptools.__path__[0])
+    sys.argv[0] = argv0
+    sys.argv.append(argv0)
+    main()
+
+
+def main(argv=None, **kw):
+    from setuptools import setup
+    from setuptools.dist import Distribution
+
+    class DistributionWithoutHelpCommands(Distribution):
+        common_usage = ""
+
+        def _show_help(self, *args, **kw):
+            with _patch_usage():
+                Distribution._show_help(self, *args, **kw)
+
+    if argv is None:
+        argv = sys.argv[1:]
+
+    with _patch_usage():
+        setup(
+            script_args=['-q', 'easy_install', '-v'] + argv,
+            script_name=sys.argv[0] or 'easy_install',
+            distclass=DistributionWithoutHelpCommands,
+            **kw
+        )
+
+
+@contextlib.contextmanager
+def _patch_usage():
+    import distutils.core
+    USAGE = textwrap.dedent("""
+        usage: %(script)s [options] requirement_or_url ...
+           or: %(script)s --help
+        """).lstrip()
+
+    def gen_usage(script_name):
+        return USAGE % dict(
+            script=os.path.basename(script_name),
+        )
+
+    saved = distutils.core.gen_usage
+    distutils.core.gen_usage = gen_usage
+    try:
+        yield
+    finally:
+        distutils.core.gen_usage = saved
+
 class EasyInstallDeprecationWarning(SetuptoolsDeprecationWarning):
     """Class for warning about deprecations in EasyInstall in SetupTools. Not ignored by default, unlike DeprecationWarning."""
     

setuptools/tests/test_easy_install.py

@@ -467,24 +467,22 @@ class TestSetupRequires:
         """
         monkeypatch.setenv(str('PIP_RETRIES'), str('0'))
         monkeypatch.setenv(str('PIP_TIMEOUT'), str('0'))
-        monkeypatch.setenv(str('PIP_VERBOSE'), str('1'))
+        with contexts.quiet():
             # create an sdist that has a build-time dependency.
             with TestSetupRequires.create_sdist() as dist_file:
-            with contexts.tempdir() as temp_dir:
-                setup_py = os.path.join(temp_dir, 'setup.py')
-                with open(setup_py, 'w') as fp:
-                    fp.write('__import__("setuptools").setup()')
-                temp_install_dir = os.path.join(temp_dir, 'target')
-                os.mkdir(temp_install_dir)
+                with contexts.tempdir() as temp_install_dir:
                     with contexts.environment(PYTHONPATH=temp_install_dir):
+                        ei_params = [
+                            '--index-url', mock_index.url,
+                            '--exclude-scripts',
+                            '--install-dir', temp_install_dir,
+                            dist_file,
+                        ]
+                        with sandbox.save_argv(['easy_install']):
                             # attempt to install the dist. It should
                             # fail because it doesn't exist.
                             with pytest.raises(SystemExit):
-                        run_setup(setup_py, ['easy_install',
-                                             '--exclude-scripts',
-                                             '--index-url', mock_index.url,
-                                             '--install-dir', temp_install_dir,
-                                             dist_file])
+                                easy_install_pkg.main(ei_params)
         # there should have been one requests to the server
         assert [r.path for r in mock_index.requests] == ['/does-not-exist/']
 

setuptools/tests/test_namespaces.py

@@ -64,8 +64,9 @@ class TestNamespaces:
         target.mkdir()
         install_cmd = [
             sys.executable,
-            '-m', 'pip.__main__', 'install',
-            '-t', str(target), str(pkg),
+            '-m', 'easy_install',
+            '-d', str(target),
+            str(pkg),
         ]
         with test.test.paths_on_pythonpath([str(target)]):
             subprocess.check_call(install_cmd)