diff -r 541659c39f6a -r c8a5ac2d1eaa hooks/syncsources.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/hooks/syncsources.py	Sat Oct 09 00:05:52 2010 +0200
@@ -0,0 +1,33 @@
+from cubicweb import ValidationError
+from cubicweb.selectors import is_instance
+from cubicweb.server import hook
+
+class SourceHook(hook.Hook):
+    __abstract__ = True
+    category = 'cw.sources'
+
+
+class SourceAddedOp(hook.Operation):
+    def precommit_event(self):
+        self.session.repo.add_source(self.entity)
+
+class SourceAddedHook(SourceHook):
+    __regid__ = 'cw.sources.added'
+    __select__ = SourceHook.__select__ & is_instance('CWSource')
+    events = ('after_add_entity',)
+    def __call__(self):
+        SourceAddedOp(self._cw, entity=self.entity)
+
+
+class SourceRemovedOp(hook.Operation):
+    def precommit_event(self):
+        self.session.repo.remove_source(self.uri)
+
+class SourceRemovedHook(SourceHook):
+    __regid__ = 'cw.sources.removed'
+    __select__ = SourceHook.__select__ & is_instance('CWSource')
+    events = ('before_delete_entity',)
+    def __call__(self):
+        if self.entity.name == 'system':
+            raise ValidationError(self.entity.eid, {None: 'cant remove system source'})
+        SourceRemovedOp(self._cw, uri=self.entity.name)