[PATCH STABLE] fix: disable use of thread-based worker

[Yuya Nishihara]

# HG changeset patch
# User Yuya Nishihara <yuya at tcha.org>
# Date 1540988214 -32400
#      Wed Oct 31 21:16:54 2018 +0900
# Branch stable
# Node ID 7dfbc7af72cb0c36717daee3313161a1edd79aa5
# Parent  bafa1c4bb7a8d397f62e0cd75b8064ef1375b753
fix: disable use of thread-based worker

getfixes() accesses to repo, changectx, filectx, etc., so I believe there
are code paths triggering data race. Mercurial API isn't thread safe in
general.

diff --git a/hgext/fix.py b/hgext/fix.py
--- a/hgext/fix.py
+++ b/hgext/fix.py
@@ -157,7 +157,8 @@ def fix(ui, repo, *pats, **opts):
                 # Don't waste memory/time passing unchanged content back, but
                 # produce one result per item either way.
                 yield (rev, path, newdata if newdata != olddata else None)
-        results = worker.worker(ui, 1.0, getfixes, tuple(), workqueue)
+        results = worker.worker(ui, 1.0, getfixes, tuple(), workqueue,
+                                threadsafe=False)
 
         # We have to hold on to the data for each successor revision in memory
         # until all its parents are committed. We ensure this by committing and