software/theia: Make each clone favicon different

Fix clone favicon being the same as the main instance favicon - this
is an uncaught regression. Add a test for it. Also give each clone a
different favicon, in case there are several clones.

See merge request nexedi/slapos!1637

software/theia/buildout.hash.cfg

@@ -23,7 +23,7 @@ md5sum = 9658a11340c018de816d0de40683706a
 
 [instance-import]
 _update_hash_filename_ = instance-import.cfg.jinja.in
-md5sum = d0ff7b93e392f9b9233f9ae6ba81583f
+md5sum = 647d99aa6f96b2515ac28013145fe81f
 
 [instance-export]
 _update_hash_filename_ = instance-export.cfg.jinja.in

software/theia/instance-import.cfg.jinja.in

@@ -67,8 +67,8 @@ autorun = stopped
 
 
 # Change the gravatar favicon seed
-[favicon.ico]
-seed = Import {{ root_title }}
+[frontend-instance-favicon.ico]
+seed = {{ theia_id }} {{ root_title }}
 
 
 # The resilient stack calls post-notification-run:output followed by

software/theia/test/test.py

@@ -650,6 +650,15 @@ class TestTheiaResilientInterface(ResilientTheiaMixin, TestTheia):
           monitor_setup_params['password'],
         )).raise_for_status()
 
+  def test_all_favicon_are_different(self):
+    favicon_relpath = os.path.join('srv', 'frontend-static', 'favicon.ico')
+    with open(self.getPartitionPath('export', favicon_relpath), 'rb') as f:
+      export_favicon = f.read()
+    with open(self.getPartitionPath('import', favicon_relpath), 'rb') as f:
+      import_favicon = f.read()
+    if export_favicon == import_favicon:
+      self.fail('Import favicon and export favicon are not different')
+
 
 class TestTheiaResilientWithEmbeddedInstance(ResilientTheiaMixin, TestTheiaWithEmbeddedInstance):
   pass