[1.9.x] Fixed #26558 -- Removed need for request context processor on admin login page.

Backport of 1206eea11e506c4e740ba2f0c1feaa01452d804b from master

AUTHORS

@@ -181,6 +181,7 @@ answer newbie questions, and generally made Django that much better:
     Danilo Bargen
     Dan Johnson <danj.py@gmail.com>
     Dan Poirier <poirier@pobox.com>
+    Dan Stephenson <http://dan.io/>
     Dan Watson <http://danwatson.net/>
     dave@thebarproject.com
     David Ascher <http://ascher.ca/>

django/contrib/admin/sites.py

@@ -398,6 +398,7 @@ class AdminSite(object):
         context = dict(self.each_context(request),
             title=_('Log in'),
             app_path=request.get_full_path(),
+            username=request.user.get_username(),
         )
         if (REDIRECT_FIELD_NAME not in request.GET and
                 REDIRECT_FIELD_NAME not in request.POST):

django/contrib/admin/templates/admin/login.html

@@ -34,7 +34,7 @@
 
 {% if user.is_authenticated %}
 <p class="errornote">
-{% blocktrans with username=request.user.get_username trimmed %}
+{% blocktrans trimmed %}
     You are authenticated as {{ username }}, but are not authorized to
     access this page. Would you like to login to a different account?
 {% endblocktrans %}

docs/releases/1.9.7.txt

@@ -9,4 +9,5 @@ Django 1.9.7 fixes several bugs in 1.9.6.
 Bugfixes
 ========
 
-* ...
+* Removed the need for the ``request`` context processor on the admin login
+  page to fix a regression in 1.9 (:ticket:`26558`).

tests/admin_views/tests.py

@@ -1290,8 +1290,21 @@ def get_perm(Model, perm):
     return Permission.objects.get(content_type=ct, codename=perm)
 
 
-@override_settings(PASSWORD_HASHERS=['django.contrib.auth.hashers.SHA1PasswordHasher'],
-    ROOT_URLCONF="admin_views.urls")
+@override_settings(
+    PASSWORD_HASHERS=['django.contrib.auth.hashers.SHA1PasswordHasher'],
+    ROOT_URLCONF='admin_views.urls',
+    # Test with the admin's documented list of required context processors.
+    TEMPLATES=[{
+        'BACKEND': 'django.template.backends.django.DjangoTemplates',
+        'APP_DIRS': True,
+        'OPTIONS': {
+            'context_processors': [
+                'django.contrib.auth.context_processors.auth',
+                'django.contrib.messages.context_processors.messages',
+            ],
+        },
+    }],
+)
 class AdminViewPermissionsTest(TestCase):
     """Tests for Admin Views Permissions."""