Notifications: unsupported VCS (#11627)

* Notifications: unsupported VCS

Closes #11600

* Update readthedocs/projects/notifications.py

Co-authored-by: Eric Holscher <[email protected]>

---------

Co-authored-by: Eric Holscher <[email protected]>

Author: humitos

readthedocs/doc_builder/director.py

@@ -13,7 +13,6 @@
 import structlog
 import yaml
 from django.conf import settings
-from django.utils.translation import gettext_lazy as _
 
 from readthedocs.builds.constants import EXTERNAL
 from readthedocs.config.config import CONFIG_FILENAME_REGEX
@@ -78,11 +77,7 @@ def setup_vcs(self):
             os.makedirs(self.data.project.doc_path)
 
         if not self.data.project.vcs_class():
-            raise RepositoryError(
-                _('Repository type "{repo_type}" unknown').format(
-                    repo_type=self.data.project.repo_type,
-                ),
-            )
+            raise RepositoryError(RepositoryError.UNSUPPORTED_VCS)
 
         before_vcs.send(
             sender=self.data.version,

readthedocs/projects/exceptions.py

@@ -25,6 +25,7 @@ class RepositoryError(BuildUserError):
     DUPLICATED_RESERVED_VERSIONS = "project:repository:duplicated-reserved-versions"
     FAILED_TO_CHECKOUT = "project:repository:checkout-failed"
     GENERIC = "project:repository:generic-error"
+    UNSUPPORTED_VCS = "project:repository:unsupported-vcs"
 
 
 class SyncRepositoryLocked(BuildAppError):

readthedocs/projects/notifications.py

@@ -94,6 +94,19 @@
         ),
         type=ERROR,
     ),
+    Message(
+        id=RepositoryError.UNSUPPORTED_VCS,
+        header=_("Repository type not suported"),
+        body=_(
+            textwrap.dedent(
+                """
+                Subversion, Mercurial, and Bazaar are not supported anymore.
+                Read more about this deprecation in <a href="https://about.readthedocs.com/blog/2024/02/drop-support-for-subversion-mercurial-bazaar/">our blog</a>.
+            """
+            ).strip(),
+        ),
+        type=ERROR,
+    ),
     Message(
         id=ProjectConfigurationError.NOT_FOUND,
         header=_("Sphinx configuration file is missing"),