[PATCH 4 of 4 V2] localrepo: make _refreshfilecachestats unfiltered method to refresh correctly

FUJIWARA Katsunori foozy at lares.dti.ne.jp
Sun Sep 11 14:11:56 EDT 2016

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1473617189 -32400
#      Mon Sep 12 03:06:29 2016 +0900
# Node ID 59f8a0e41e092819b48fff468795c96a464d22a4
# Parent  0f6ba83a54fab382452faf389265ef636d0c42a1
localrepo: make _refreshfilecachestats unfiltered method to refresh correctly

Before this patch, if transaction is started via "filtered repo"
object, _refreshfilecachestats() at closing transaction doesn't
refresh file stat of any @filecache properties correctly, because:

  - _refreshfilecachestats() omits refreshing file stat of a
    @filecache property, if it doesn't appear in self.__dict__

  - if transaction is started via "filtered repo",
    _refreshfilecachestats() is applied on "filtered repo"

    because repo.transaction() adds "self._refreshfilecachestats" to
    post close procedures. repo.transaction() isn't unfiltered method,
    and "self" in it means "filtered repo" in this case.

    Transactions started by explicit repo.transaction() easily causes
    this situation.

  - _refreshfilecachestats() applied on "filtered repo" omits whole

    because @filecache properties are stored into "unfiltered repo",
    and appear only in self.__dict__ of "unfiltered repo".

This incorrect refreshing causes unnecessary reloading from files.

To refresh file stat of @filecache properties at closing transaction
correctly, this patch makes _refreshfilecachestats() unfiltered

This patch chooses making _refreshfilecachestats() unfiltered method
instead of making transaction() unfiltered method, to reduce
unexpected side effect.

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1279,6 +1279,7 @@ class localrepository(object):
+    @unfilteredmethod
     def _refreshfilecachestats(self, tr):
         """Reload stats of cached files so that they are flagged as valid"""
         for k, ce in self._filecache.items():

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