Reset uninstall order as before c509c5c

In the case of develop install where we have an egg-info directory and
an egg-link, make sure we uninstall it in the develop_egg_link if case.

Fix #2456

Author: xavfernandez

pip/req/req_install.py

@@ -560,22 +560,18 @@ def uninstall(self, auto_confirm=False):
 
         paths_to_remove = UninstallPathSet(dist)
         develop_egg_link = egg_link_path(dist)
+        develop_egg_link_egg_info = '{0}.egg-info'.format(
+            pkg_resources.to_filename(dist.project_name))
         egg_info_exists = dist.egg_info and os.path.exists(dist.egg_info)
         # Special case for distutils installed package
         distutils_egg_info = getattr(dist._provider, 'path', None)
-        if develop_egg_link:
-            # develop egg
-            with open(develop_egg_link, 'r') as fh:
-                link_pointer = os.path.normcase(fh.readline().strip())
-            assert (link_pointer == dist.location), (
-                'Egg-link %s does not match installed location of %s '
-                '(at %s)' % (link_pointer, self.name, dist.location)
-            )
-            paths_to_remove.add(develop_egg_link)
-            easy_install_pth = os.path.join(os.path.dirname(develop_egg_link),
-                                            'easy-install.pth')
-            paths_to_remove.add_pth(easy_install_pth, dist.location)
-        elif egg_info_exists and dist.egg_info.endswith('.egg-info'):
+
+        # Uninstall cases order do matter as in the case of 2 installs of the
+        # same package, pip needs to uninstall the currently detected version
+        if (egg_info_exists and dist.egg_info.endswith('.egg-info') and
+                not dist.egg_info.endswith(develop_egg_link_egg_info)):
+            # if dist.egg_info.endswith(develop_egg_link_egg_info), we
+            # are in fact in the develop_egg_link case
             paths_to_remove.add(dist.egg_info)
             if dist.has_metadata('installed-files.txt'):
                 for installed_file in dist.get_metadata(
@@ -621,9 +617,23 @@ def uninstall(self, auto_confirm=False):
                                             'easy-install.pth')
             paths_to_remove.add_pth(easy_install_pth, './' + easy_install_egg)
 
+        elif develop_egg_link:
+            # develop egg
+            with open(develop_egg_link, 'r') as fh:
+                link_pointer = os.path.normcase(fh.readline().strip())
+            assert (link_pointer == dist.location), (
+                'Egg-link %s does not match installed location of %s '
+                '(at %s)' % (link_pointer, self.name, dist.location)
+            )
+            paths_to_remove.add(develop_egg_link)
+            easy_install_pth = os.path.join(os.path.dirname(develop_egg_link),
+                                            'easy-install.pth')
+            paths_to_remove.add_pth(easy_install_pth, dist.location)
+
         elif egg_info_exists and dist.egg_info.endswith('.dist-info'):
             for path in pip.wheel.uninstallation_paths(dist):
                 paths_to_remove.add(path)
+
         else:
             logger.debug(
                 'Not sure how to uninstall: %s - Check: %s',

tests/functional/test_uninstall.py

@@ -388,3 +388,24 @@ def test_uninstall_wheel(script, data):
     assert dist_info_folder in result.files_created
     result2 = script.pip('uninstall', 'simple.dist', '-y')
     assert_all_changes(result, result2, [])
+
+
+def test_uninstall_setuptools_develop_install(script, data):
+    """Try uninstall after setup.py develop followed of setup.py install"""
+    pkg_path = data.packages.join("FSPkg")
+    script.run('python', 'setup.py', 'develop',
+               expect_stderr=True, cwd=pkg_path)
+    script.run('python', 'setup.py', 'install',
+               expect_stderr=True, cwd=pkg_path)
+    list_result = script.pip('list')
+    assert "FSPkg (0.1.dev0)" in list_result.stdout
+    # Uninstall both develop and install
+    uninstall = script.pip('uninstall', 'FSPkg', '-y')
+    assert any(filename.endswith('.egg')
+               for filename in uninstall.files_deleted.keys())
+    uninstall2 = script.pip('uninstall', 'FSPkg', '-y')
+    assert join(
+        script.site_packages, 'FSPkg.egg-link'
+    ) in uninstall2.files_deleted, list(uninstall2.files_deleted.keys())
+    list_result2 = script.pip('list')
+    assert "FSPkg" not in list_result2.stdout