# HG changeset patch
# User FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
# Date 1430968031 -32400
# Node ID 12f3c7144a391f60229cfa83e53122bc9148dde0
# Parent  58308ddea2087486dd27db1a7cafc8dcf6e73fcd
mq: use dirstateguard instead of dirstate.invalidate (qrefresh)

Before this patch, "mq.queue.refresh()" uses "dirstate.invalidate()"
as a kind of "restore .hg/dirstate to the original status" during a failure.

But it just discards changes in memory, and doesn't actually restore
".hg/dirstate". Then, it can't work as expected, if "dirstate.write()"
is executed while processing.

This patch uses "dirstateguard" instead of "dirstate.invalidate()" to
restore ".hg/dirstate" during a failure even if "dirstate.write()" is
executed before a failure.

This patch also removes "beginparentchage()" and "endparentchange()",
because "dirstateguard" makes them useless.

This is a part of preparations to fix the issue that the recent (in
memory) dirstate isn't visible to external processes (e.g. "precommit"
hook).

diff -r 58308ddea208 -r 12f3c7144a39 hgext/mq.py
--- a/hgext/mq.py	Thu May 07 12:07:11 2015 +0900
+++ b/hgext/mq.py	Thu May 07 12:07:11 2015 +0900
@@ -1683,8 +1683,9 @@
 
             bmlist = repo[top].bookmarks()
 
+            dsguard = None
             try:
-                repo.dirstate.beginparentchange()
+                dsguard = cmdutil.dirstateguard(repo, 'mq.refresh')
                 if diffopts.git or diffopts.upgrade:
                     copies = {}
                     for dst in a:
@@ -1737,13 +1738,12 @@
 
                 # assumes strip can roll itself back if interrupted
                 repo.setparents(*cparents)
-                repo.dirstate.endparentchange()
                 self.applied.pop()
                 self.applieddirty = True
                 strip(self.ui, repo, [top], update=False, backup=False)
-            except: # re-raises
-                repo.dirstate.invalidate()
-                raise
+                dsguard.close()
+            finally:
+                release(dsguard)
 
             try:
                 # might be nice to attempt to roll back strip after this