Refs #21114: WIP: Check branch deduction

Signed-off-by: eduponz <eduardoponz@eprosima.com>

Author: EduPonz

docs/conf.py

@@ -101,6 +101,16 @@ def get_git_branch():
 
     # Invoke git to get the current branch which we use to get the theme
     try:
+        p = subprocess.Popen(
+            ['git', 'branch', '-a', '--contains' 'HEAD'],
+            stdout=subprocess.PIPE,
+            cwd=path_to_here
+        )
+        print('*****************************************')
+        print('Branches that contain HEAD:')
+        print(p.communicate()[0].decode().rstrip())
+        print('*****************************************')
+
         p = subprocess.Popen(
             ['git', 'rev-parse', '--abbrev-ref', 'HEAD'],
             stdout=subprocess.PIPE,