# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 1529014099 25200
# Node ID 9b1536b02221741135effe9ffdb1a3f3f1cda8fc
# Parent  eef4668be8a3e727c8c9e5bd08c63437f5cf2040
backout: use context manager for locks

Differential Revision: https://phab.mercurial-scm.org/D3744

diff -r eef4668be8a3 -r 9b1536b02221 mercurial/commands.py
--- a/mercurial/commands.py	Thu Jun 14 15:28:32 2018 -0700
+++ b/mercurial/commands.py	Thu Jun 14 15:08:19 2018 -0700
@@ -560,13 +560,8 @@
     Returns 0 on success, 1 if nothing to backout or there are unresolved
     files.
     '''
-    wlock = lock = None
-    try:
-        wlock = repo.wlock()
-        lock = repo.lock()
+    with repo.wlock(), repo.lock():
         return _dobackout(ui, repo, node, rev, **opts)
-    finally:
-        release(lock, wlock)
 
 def _dobackout(ui, repo, node=None, rev=None, **opts):
     opts = pycompat.byteskwargs(opts)