Update under feature flag

Author: stsewd

readthedocs/doc_builder/python_environments.py

@@ -291,7 +291,13 @@ def install_core_requirements(self):
         ]
 
         if self.config.doctype == 'mkdocs':
-            requirements.append('mkdocs<1.1')
+            requirements.append(
+                self.project.get_feature_value(
+                    Feature.DEFAULT_TO_MKDOCS_0_17_3,
+                    positive='mkdocs==0.17.3',
+                    negative='mkdocs<1.1',
+                ),
+            )
         else:
             # We will assume semver here and only automate up to the next
             # backward incompatible release: 2.x

readthedocs/projects/models.py

@@ -1312,6 +1312,7 @@ def add_features(sender, **kwargs):
     USE_TESTING_BUILD_IMAGE = 'use_testing_build_image'
     SHARE_SPHINX_DOCTREE = 'share_sphinx_doctree'
     USE_PDF_LATEXMK = 'use_pdf_latexmk'
+    DEFAULT_TO_MKDOCS_0_17_3 = 'default_to_mkdocs_0_17_3'
 
     FEATURES = (
         (USE_SPHINX_LATEST, _('Use latest version of Sphinx')),
@@ -1346,6 +1347,10 @@ def add_features(sender, **kwargs):
             SHARE_SPHINX_DOCTREE,
             _('Use shared directory for doctrees'),
         ),
+        (
+            DEFAULT_TO_MKDOCS_0_17_3,
+            _('Install mkdocs 0.17.3 by default')
+        ),
     )
 
     projects = models.ManyToManyField(