Build: expose VCS-related environment variables

docs/user/reference/environment-variables.rst

@@ -56,6 +56,31 @@ All :doc:`build processes </builds>` have the following environment variables au
     :Example: ``https://docs.readthedocs.io/ja/stable/``
     :Example: ``https://example--17.org.readthedocs.build/fr/17/``
 
+.. envvar:: READTHEDOCS_GIT_CLONE_URL
+
+    URL for the remote source repository, from which the documentation is cloned.
+    It could be HTTPS, SSH or any other URL scheme supported by Git.
+    This is the same URL defined in your Project's :term:`dashboard` in :menuselection:`Admin --> Settings --> Repository URL`.
+
+    :Example: ``https://github.com/readthedocs/readthedocs.org``
+    :Example: ``git@github.com:readthedocs/readthedocs.org.git``
+
+.. envvar:: READTHEDOCS_GIT_IDENTIFIER
+
+    Contains the Git identifier that was *checked out* from the remote repository URL.
+    Possible values are either a branch or tag name.
+
+    :Example: ``v1.x``
+    :Example: ``bugfix/docs-typo``
+    :Example: ``feature/signup``
+    :Example: ``update-readme``
+
+.. envvar:: READTHEDOCS_GIT_COMMIT_HASH
+
+    Git commit hash identifier checked out from the repository URL.
+
+    :Example: ``1f94e04b7f596c309b7efab4e7630ed78e85a1f1``
+
 .. seealso::
 
    :doc:`/environment-variables`

readthedocs/doc_builder/director.py

@@ -574,6 +574,12 @@ def get_rtd_env_vars(self):
             "READTHEDOCS_OUTPUT": os.path.join(
                 self.data.project.checkout_path(self.data.version.slug), "_readthedocs/"
             ),
+            "READTHEDOCS_GIT_CLONE_URL": self.data.project.repo,
+            # TODO: we don't have access to the database from the builder.
+            # We need to find a way to expose HTML_URL here as well.
+            # "READTHEDOCS_GIT_HTML_URL": self.data.project.remote_repository.html_url,
+            "READTHEDOCS_GIT_IDENTIFIER": self.data.version.identifier,
+            "READTHEDOCS_GIT_COMMIT_HASH": self.data.build["commit"],
         }
         return env
 

readthedocs/projects/tests/test_build_tasks.py

@@ -279,6 +279,9 @@ def test_get_env_vars(self, load_yaml_config, build_environment, config, externa
             "READTHEDOCS_OUTPUT": os.path.join(
                 self.project.checkout_path(self.version.slug), "_readthedocs/"
             ),
+            "READTHEDOCS_GIT_CLONE_URL": self.project.repo,
+            "READTHEDOCS_GIT_IDENTIFIER": self.version.identifier,
+            "READTHEDOCS_GIT_COMMIT_HASH": self.build.commit,
         }
 
         self._trigger_update_docs_task()