# HG changeset patch
# User Martin von Zweigbergk <martinvonz@google.com>
# Date 1430840459 25200
# Node ID 48583a1e44f37a8a4a76693459f0e97e4efbb2cc
# Parent  1df233bcb7f6447849b543c377eade6092f5732f
treemanifest: set requires at repo creation time, ignore config after

The very next changeset will start writing one revlog per directory
when tree manifests are enabled. That is backwards incompatible, so it
requires .hg/requires to be updated. Just like with generaldelta, we
want to update .hg/requires only when the repo is created. Updating
..hg/requires is bad for repos on shared disk. Instead, those who do
want to upgrade a repo to using treemanifest (or manifestv2, etc) can
run

  hg clone --config experimental.treemanifest repo clone


which will create a new repo with the requirement set. Unlike the case
of e.g. generaldelta, it will not rewrite the changesets, since tree
manifests hash differently.

diff -r 1df233bcb7f6 -r 48583a1e44f3 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Apr 21 09:29:59 2015 -0700
+++ b/mercurial/localrepo.py	Tue May 05 08:40:59 2015 -0700
@@ -192,10 +192,11 @@
 
 class localrepository(object):
 
-    supportedformats = set(('revlogv1', 'generaldelta', 'manifestv2'))
+    supportedformats = set(('revlogv1', 'generaldelta', 'treemanifest',
+                            'manifestv2'))
     _basesupported = supportedformats | set(('store', 'fncache', 'shared',
                                              'dotencode'))
-    openerreqs = set(('revlogv1', 'generaldelta', 'manifestv2'))
+    openerreqs = set(('revlogv1', 'generaldelta', 'treemanifest', 'manifestv2'))
     filtername = None
 
     # a list of (ui, featureset) functions.
@@ -259,6 +260,8 @@
                     )
                 if self.ui.configbool('format', 'generaldelta', False):
                     self.requirements.add("generaldelta")
+                if self.ui.configbool('experimental', 'treemanifest', False):
+                    self.requirements.add("treemanifest")
                 if self.ui.configbool('experimental', 'manifestv2', False):
                     self.requirements.add("manifestv2")
             else:
@@ -348,9 +351,6 @@
         manifestcachesize = self.ui.configint('format', 'manifestcachesize')
         if manifestcachesize is not None:
             self.svfs.options['manifestcachesize'] = manifestcachesize
-        usetreemanifest = self.ui.configbool('experimental', 'treemanifest')
-        if usetreemanifest is not None:
-            self.svfs.options['usetreemanifest'] = usetreemanifest
 
     def _writerequirements(self):
         scmutil.writerequires(self.vfs, self.requirements)
diff -r 1df233bcb7f6 -r 48583a1e44f3 mercurial/manifest.py
--- a/mercurial/manifest.py	Tue Apr 21 09:29:59 2015 -0700
+++ b/mercurial/manifest.py	Tue May 05 08:40:59 2015 -0700
@@ -760,7 +760,7 @@
         opts = getattr(opener, 'options', None)
         if opts is not None:
             cachesize = opts.get('manifestcachesize', cachesize)
-            usetreemanifest = opts.get('usetreemanifest', usetreemanifest)
+            usetreemanifest = opts.get('treemanifest', usetreemanifest)
             usemanifestv2 = opts.get('manifestv2', usemanifestv2)
         self._mancache = util.lrucachedict(cachesize)
         revlog.revlog.__init__(self, opener, "00manifest.i")