[PATCH STABLE] strip: fix revset usage (issue3604)

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at ens-lyon.org>
# Date 1346440830 -7200
# Branch stable
# Node ID 8f5348657f23c0bb66625a64c792a0dba97659ef
# Parent  b0aad9fb87f947e821f0381d461f1794e73833a7
strip: fix revset usage (issue3604)

The `repair` code builds a giant revset query instead of using the "%lr" idiom.
It is inefficient and crash when the number of stripped changeset is too big.

This changeset replaces the bad code by a better revset usage.

diff --git a/mercurial/repair.py b/mercurial/repair.py
--- a/mercurial/repair.py
+++ b/mercurial/repair.py
@@ -111,9 +111,10 @@
         saverevs.difference_update(descendants)
     savebases = [cl.node(r) for r in saverevs]
     stripbases = [cl.node(r) for r in tostrip]
-    rset = ' or '.join([str(r) for r in tostrip])
-    newbmtarget = repo.revs('sort(heads(ancestors(%r) - (%r)), -rev)',
-                            rset, rset)
+
+    touched = saverevs | tostrip
+    newbmtarget = repo.revs('sort(heads((::%ld) - (%ld)), -rev)',
+                            touched, touched)
     if newbmtarget:
         newbmtarget = newbmtarget[0]
     else: