with: use context manager for wlock in sign

hgext/gpg.py

@@ -9,7 +9,6 b' import os, tempfile, binascii'
 from mercurial import util, commands, match, cmdutil, error
 from mercurial import node as hgnode
 from mercurial.i18n import _
-from mercurial import lock as lockmod
 
 cmdtable = {}
 command = cmdutil.command(cmdtable)
@@ -223,12 +222,8 b' def sign(ui, repo, *revs, **opts):'
 
     See :hg:`help dates` for a list of formats valid for -d/--date.
     """
-    wlock = None
-    try:
-        wlock = repo.wlock()
+    with repo.wlock():
         return _dosign(ui, repo, *revs, **opts)
-    finally:
-        lockmod.release(wlock)
 
 def _dosign(ui, repo, *revs, **opts):
     mygpg = newgpg(ui, **opts)