# HG changeset patch
# User Valentin Gatien-Baron <valentin.gatienbaron@gmail.com>
# Date 2021-05-16 14:57:14
# Node ID 13dd5bb5492acd097fa0e6e416c47e2b9361a51f
# Parent  aa07bcc4f505365c841a8f38bfbe3c55f2868ce0

transaction: trivial refactoring

Differential Revision: https://phab.mercurial-scm.org/D10714

diff --git a/mercurial/transaction.py b/mercurial/transaction.py
--- a/mercurial/transaction.py
+++ b/mercurial/transaction.py
@@ -720,9 +720,8 @@ def rollback(opener, vfsmap, file, repor
     entries = []
     backupentries = []
 
-    fp = opener.open(file)
-    lines = fp.readlines()
-    fp.close()
+    with opener.open(file) as fp:
+        lines = fp.readlines()
     for l in lines:
         try:
             f, o = l.split(b'\0')