# HG changeset patch
# User Bryan O'Sullivan <bryano@fb.com>
# Date 2012-12-17 23:52:44
# Node ID 52620e5db2f6631fd6b068dd8f779e2772562250
# Parent  5712e3b1227446a47ae94489abb6a459457a3c57

ignore: only read an ignore file once

diff --git a/mercurial/ignore.py b/mercurial/ignore.py
--- a/mercurial/ignore.py
+++ b/mercurial/ignore.py
@@ -57,6 +57,8 @@ def readpats(root, files, warn):
 
     pats = {}
     for f in files:
+        if f in pats:
+            continue
         try:
             pats[f] = []
             fp = open(f)