# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@ens-lyon.org>
# Date 2012-12-17 17:09:41
# Node ID ee3b5fb648c70f5595cca6cd396666dabcf803bb
# Parent  717c692fa4496a2fe48232d1a7e5f96a4f6f17d2

clfilter: ensure context raise RepoLookupError when the revision is filtered

Currently the code path of `changectx(filteredrepo, rev)` call
`filteredrepo.changelog.node(rev)`. When `rev` is filtered this raise an
unhandled `IndexError`. This case now raise a `RepoLookupError` as other
error case do.

diff --git a/mercurial/context.py b/mercurial/context.py
--- a/mercurial/context.py
+++ b/mercurial/context.py
@@ -25,8 +25,12 @@ class changectx(object):
         self._repo = repo
 
         if isinstance(changeid, int):
+            try:
+                self._node = repo.changelog.node(changeid)
+            except IndexError:
+                raise error.RepoLookupError(
+                    _("unknown revision '%s'") % changeid)
             self._rev = changeid
-            self._node = repo.changelog.node(changeid)
             return
         if isinstance(changeid, long):
             changeid = str(changeid)