changeset 27287:c9ceea3f2d8e

shelve: widen wlock scope of unshelve for consistency while processing

Before this patch, "hg unshelve" of shelve extension executes below
before acquisition of wlock:

  - cmdutil.checkunfinished()
  - examine existence of (specified) shelve file

It may cause unintentional result, if another command runs parallelly
(see also issue4368).

This patch widens wlock scope of "hg unshelve" of shelve extension for
consistency while processing.

--- a/hgext/shelve.py	Sun Dec 06 17:07:50 2015 -0800
+++ b/hgext/shelve.py	Wed Dec 09 08:28:53 2015 +0900
@@ -616,6 +616,13 @@
        than ``maxbackups`` backups are kept, if same timestamp
        prevents from deciding exact order of them, for safety.
     """
+    wlock = repo.wlock()
+    try:
+        return _dounshelve(ui, repo, *shelved, **opts)
+    finally:
+        lockmod.release(wlock)
+
+def _dounshelve(ui, repo, *shelved, **opts):
     abortf = opts['abort']
     continuef = opts['continue']
     if not abortf and not continuef:
@@ -656,11 +663,10 @@
         raise error.Abort(_("shelved change '%s' not found") % basename)
 
     oldquiet = ui.quiet
-    wlock = lock = tr = None
+    lock = tr = None
     forcemerge = ui.backupconfig('ui', 'forcemerge')
     try:
         ui.setconfig('ui', 'forcemerge', opts.get('tool', ''), 'unshelve')
-        wlock = repo.wlock()
         lock = repo.lock()
 
         tr = repo.transaction('unshelve', report=lambda x: None)
@@ -755,7 +761,7 @@
         ui.quiet = oldquiet
         if tr:
             tr.release()
-        lockmod.release(lock, wlock)
+        lockmod.release(lock)
         ui.restoreconfig(forcemerge)
 
 @command('shelve',