[PATCH 6 of 7 V2] caches: invalidate store caches when lock is taken

[Durham Goode]

# HG changeset patch
# User Durham Goode <durham at fb.com>
# Date 1395700507 25200
#      Mon Mar 24 15:35:07 2014 -0700
# Node ID 013a9a420cdfcf7b74e453f55e451db2ea889d15
# Parent  23c4a802f5179a96dcc0ae26ce97671b675d87e3
caches: invalidate store caches when lock is taken

The fncache was not being properly invalidated each time the lock was taken, so
in theory it could contain old data from prior to the caller having the lock.
This changes it to be invalidated as soon as the lock is taken (same as all our
other caches).

diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -996,6 +996,7 @@
             except AttributeError:
                 pass
         self.invalidatecaches()
+        self.store.invalidatecaches()
 
     def invalidateall(self):
         '''Fully invalidates both store and non-store parts, causing the
diff --git a/mercurial/store.py b/mercurial/store.py
--- a/mercurial/store.py
+++ b/mercurial/store.py
@@ -340,6 +340,9 @@
     def write(self, tr):
         pass
 
+    def invalidatecaches(self):
+        pass
+
     def __contains__(self, path):
         '''Checks if the store contains path'''
         path = "/".join(("data", path))
@@ -489,6 +492,9 @@
     def write(self, tr):
         self.fncache.write(tr)
 
+    def invalidatecaches(self):
+        self.fncache.entries = None
+
     def _exists(self, f):
         ef = self.encode(f)
         try: