narrow: copy store narrowspec to working copy immediately

We no longer need to delay it until the end of the transaction since
we now restore a backup if the transaction aborts.

Differential Revision: https://phab.mercurial-scm.org/D5506

hgext/narrow/narrowcommands.py

@@ -432,9 +432,9 b' def trackedcmd(ui, repo, remotepath=None'
         return 0
 
     if update_working_copy:
-        with repo.wlock(), repo.lock(), repo.transaction('narrow-wc') as tr:
+        with repo.wlock(), repo.lock(), repo.transaction('narrow-wc'):
             narrowspec.updateworkingcopy(repo)
-            narrowspec.copytoworkingcopy(repo, tr)
+            narrowspec.copytoworkingcopy(repo)
         return 0
 
     if not widening and not narrowing:

mercurial/hg.py

@@ -334,7 +334,7 b' def postshare(sourcerepo, destrepo, defa'
         destrepo.vfs.write('hgrc', util.tonativeeol(template % default))
     if repositorymod.NARROW_REQUIREMENT in sourcerepo.requirements:
         with destrepo.wlock():
-            narrowspec.copytoworkingcopy(destrepo, None)
+            narrowspec.copytoworkingcopy(destrepo)
 
 def _postshareupdate(repo, update, checkout=None):
     """Maybe perform a working directory update after a shared repo is created.

mercurial/localrepo.py

@@ -1252,7 +1252,7 b' class localrepository(object):'
 
     def setnarrowpats(self, newincludes, newexcludes):
         narrowspec.save(self, newincludes, newexcludes)
-        narrowspec.copytoworkingcopy(self, self.currenttransaction())
+        narrowspec.copytoworkingcopy(self)
         self.invalidate(clearfilecache=True)
         # So the next access won't be considered a conflict
         # TODO: It seems like there should be a way of doing this that

mercurial/narrowspec.py

@@ -161,15 +161,7 b' def save(repo, includepats, excludepats)'
     spec = format(includepats, excludepats)
     repo.svfs.write(FILENAME, spec)
 
-def copytoworkingcopy(repo, tr):
-    if tr:
-        def write(file):
-            spec = repo.svfs.read(FILENAME)
-            file.write(spec)
-            file.close()
-        tr.addfilegenerator('narrowspec', (DIRSTATE_FILENAME,), write,
-                            location='plain')
-    else:
+def copytoworkingcopy(repo):
         spec = repo.svfs.read(FILENAME)
         repo.vfs.write(DIRSTATE_FILENAME, spec)