Martin Geisler committed 91c6a98

Document hook.

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     return retcode
 def hook(ui, repo, node, **kwargs):
+    """verify changeset signatures
+    This hook is suitable for use as a ``pretxnchangegroup`` hook. It
+    will verify that all pushed changesets carry a good signature. If
+    one or more changesets lack a good signature, the push is aborted.
+    """
     ctx = repo[node]
     if checksigs(ui, repo, "%s:" % node) > 0:
         raise error.Abort(_("could not verify all changeset"))