[PATCH 3 of 7 V4] clfilter: introduce a "unserver" filtering mode

[pierre-yves.david at logilab.fr]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at logilab.fr>
# Date 1355760722 -3600
# Node ID 92ce40f2bb8a27653c52d2aa43333b9f0c0b19ea
# Parent  54f51cc8f3a34dac96178a873e7aad5ad4fe207a
clfilter: introduce a "unserver" filtering mode

This mode is for repository used as a server. It filter secret and hidden
changeset out.

It is put to use in later changeset.

diff --git a/mercurial/repoview.py b/mercurial/repoview.py
--- a/mercurial/repoview.py
+++ b/mercurial/repoview.py
@@ -5,13 +5,24 @@
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 import copy
+import phases
+
+def computeunserved(repo):
+    """compute the set of revision that should be filtered when used a server
+
+    Secret and hidden changeset should not pretend to be here."""
+    assert not repo.changelog.filteredrevs
+    # fast path in simple case to avoid impact of non optimised code
+    if phases.hassecret(repo) or repo.obsstore:
+        return frozenset(repo.revs('hidden() + secret()'))
+    return ()
 
 # function to compute filtered set
-filtertable = {}
+filtertable = {'unserved': computeunserved}
 
 def filteredrevs(repo, filtername):
     """returns set of filtered revision for this filter name"""
     if filtername not in repo.filteredrevcache:
         func = filtertable[filtername]