caches: make sure we init caches on repo names withou '/' to not create a new cache subpath

rhodecode/lib/rc_cache/backends.py

@@ -168,7 +168,7 b' class FileNamespaceBackend(PickleSeriali'
         try:
             super(FileNamespaceBackend, self).__init__(arguments)
         except Exception:
-            log.error('Failed to initialize db at: %s', db_file)
+            log.exception('Failed to initialize db at: %s', db_file)
             raise
 
     def __repr__(self):

rhodecode/lib/vcs/client_http.py

@@ -186,7 +186,7 b' class RemoteRepo(object):'
         self.stream_url = remote_maker.stream_url
         self._session = remote_maker._session_factory()
         self._cache_region, self._cache_namespace = \
-            remote_maker.init_cache_region(repo_id)
+            remote_maker.init_cache_region(self._repo_id_sanitizer(repo_id))
 
         with_wire = with_wire or {}
 
@@ -209,6 +209,9 b' class RemoteRepo(object):'
 
         self.cert_dir = get_cert_path(rhodecode.CONFIG.get('__file__'))
 
+    def _repo_id_sanitizer(self, repo_id):
+        return repo_id.replace('/', '__')
+
     def __getattr__(self, name):
 
         if name.startswith('stream:'):

rhodecode/model/repo.py

@@ -940,6 +940,7 b' class RepoModel(BaseModel):'
         if landing_rev_name.startswith('branch:'):
             landing_rev_name = landing_rev_name.split('branch:')[-1]
         scm_instance = repo.scm_instance()
+        if scm_instance:
         return scm_instance._remote.set_head_ref(landing_rev_name)
 
     def _create_filesystem_repo(self, repo_name, repo_type, repo_group,