diff mercurial/obsolete.py @ 17296:a1f8869f2eee stable

obsolete: introduce an `_enabled` switch to disable the feature by default

Obsolete markers wide-usage and propagation should be avoided by default until
the obsolete feature is more mature.

This changeset introduce the `_enable` variable and prevent the creation of
obsolete marker if the feature is set to `False` (the default).

More limitation comes in followup changesets.

--- a/mercurial/obsolete.py	Fri Jul 27 18:32:56 2012 +0200
+++ b/mercurial/obsolete.py	Sat Jul 28 13:19:06 2012 +0200
@@ -58,7 +58,9 @@
 _pack = struct.pack
 _unpack = struct.unpack
 
-
+# the obsolete feature is not mature enought to be enabled by default.
+# you have to rely on third party extension extension to enable this.
+_enabled = False
 
 # data used for parsing and writing
 _fmversion = 0
@@ -194,6 +196,8 @@
 
         Take care of filtering duplicate.
         Return the number of new marker."""
+        if not _enabled:
+            raise util.Abort('obsolete feature is not enabled on this repo')
         new = [m for m in markers if m not in self._all]
         if new:
             f = self.sopener('obsstore', 'ab')