--- a/cwctl.py	Mon Jun 20 19:13:38 2011 +0200
+++ b/cwctl.py	Tue Jun 21 10:44:43 2011 +0200
@@ -757,18 +757,16 @@
             applcubicwebversion = vcconf.get('cubicweb')
         if cubicwebversion > applcubicwebversion:
             toupgrade.append(('cubicweb', applcubicwebversion, cubicwebversion))
-        if not self.config.fs_only and not toupgrade:
-            print '-> no data migration needed for instance %s.' % appid
-            self.i18nupgrade(config)
-            mih.shutdown()
-            return
-        for cube, fromversion, toversion in toupgrade:
-            print '-> migration needed from %s to %s for %s' % (fromversion, toversion, cube)
         # only stop once we're sure we have something to do
         if not (CWDEV or self.config.nostartstop):
             StopInstanceCommand(self.logger).stop_instance(appid)
         # run cubicweb/componants migration scripts
-        mih.migrate(vcconf, reversed(toupgrade), self.config)
+        if self.config.fs_only or toupgrade:
+            for cube, fromversion, toversion in toupgrade:
+                print '-> migration needed from %s to %s for %s' % (fromversion, toversion, cube)
+            mih.migrate(vcconf, reversed(toupgrade), self.config)
+        else:
+            print '-> no data migration needed for instance %s.' % appid
         # rewrite main configuration file
         mih.rewrite_configuration()
         mih.shutdown()

--- a/migration.py	Mon Jun 20 19:13:38 2011 +0200
+++ b/migration.py	Tue Jun 21 10:44:43 2011 +0200
@@ -492,6 +492,8 @@
                         self.warnings.append(
                             'cube %s depends on %s but constraint badly '
                             'formatted: %s' % (cube, name, constraint))
+                else:
+                    self.reverse_dependencies[name].add( (None, None, cube) )
         # check consistency
         for cube, versions in sorted(self.reverse_dependencies.items()):
             oper, version, source = None, None, None
@@ -517,5 +519,7 @@
                 if oper in ('>=','='):
                     if lower_strict:
                         self.errors.append( ('update', cube, version, source) )
+                elif oper is None:
+                    pass # no constraint on version
                 else:
                     print 'unknown operator', oper

--- a/misc/migration/3.12.0_Any.py	Mon Jun 20 19:13:38 2011 +0200
+++ b/misc/migration/3.12.0_Any.py	Tue Jun 21 10:44:43 2011 +0200
@@ -1,2 +1,4 @@
-add_entity_type('TZDatetime')
-add_entity_type('TZTime')
+if schema['TZDatetime'].eid is None:
+    add_entity_type('TZDatetime')
+if schema['TZTime'].eid is None:
+    add_entity_type('TZTime')