# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 2018-11-14 19:30:46
# Node ID acd17caa699a91f7b7c5b8353e209bc0faea3c28
# Parent  c9876c00d292baf9b839da76366c206a71332231

requires: use atomictemp=True when writing .hg/requires

We use an unusual file system at Google that allows writes (and
renames) but not deletions (for certain paths). That causes problems
when writing the requires files without atomictemp=True. There doesn't
appear to be any real drawbacks to using atomictemp, so I'm hoping we
can just change it in core.

Differential Revision: https://phab.mercurial-scm.org/D5274

diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -1166,7 +1166,7 @@ def dirstatecopy(ui, repo, wctx, src, ds
             wctx.copy(origsrc, dst)
 
 def writerequires(opener, requirements):
-    with opener('requires', 'w') as fp:
+    with opener('requires', 'w', atomictemp=True) as fp:
         for r in sorted(requirements):
             fp.write("%s\n" % r)