[PATCH 2 of 7 STABLE] subrepo: ensure "lock.release()" execution at the end of "_cachestorehash()"

[FUJIWARA Katsunori]

# HG changeset patch
# User FUJIWARA Katsunori <foozy at lares.dti.ne.jp>
# Date 1403191279 -32400
#      Fri Jun 20 00:21:19 2014 +0900
# Branch stable
# Node ID f1af69e11e972b1be65ca7d5e62126c00713a10b
# Parent  15bc43d3360a4826cab2c3b93e6bf2cfafbcf070
subrepo: ensure "lock.release()" execution at the end of "_cachestorehash()"

Before this patch, "lock.release()" for "self._repo" in
"_cachestorehash()" of "hgsubrepo" may not be executed, if unexpected
exception is raised, because it isn't executed in "finally" clause.

This patch ensures "lock.release()" execution at the end of
"_cachestorehash()" by moving it into "finally" clause.

diff --git a/mercurial/subrepo.py b/mercurial/subrepo.py
--- a/mercurial/subrepo.py
+++ b/mercurial/subrepo.py
@@ -582,14 +582,16 @@ class hgsubrepo(abstractsubrepo):
         '''
         cachefile = self._getstorehashcachepath(remotepath)
         lock = self._repo.lock()
-        storehash = list(self._calcstorehash(remotepath))
-        cachedir = os.path.dirname(cachefile)
-        if not os.path.exists(cachedir):
-            util.makedirs(cachedir, notindexed=True)
-        fd = open(cachefile, 'w')
-        fd.writelines(storehash)
-        fd.close()
-        lock.release()
+        try:
+            storehash = list(self._calcstorehash(remotepath))
+            cachedir = os.path.dirname(cachefile)
+            if not os.path.exists(cachedir):
+                util.makedirs(cachedir, notindexed=True)
+            fd = open(cachefile, 'w')
+            fd.writelines(storehash)
+            fd.close()
+        finally:
+            lock.release()
 
     @annotatesubrepoerror
     def _initrepo(self, parentrepo, source, create):