# HG changeset patch
# User Brendan Cully <brendan@kublai.com>
# Date 1165354902 28800
# Node ID bd7011246fabeaffd6e331a774ab3a9a29db1cd4
# Parent  630caaf2981584d01eda969d97d8431f44545f4f
Add "null" pseudo-tag pointing to nullid

diff -r 630caaf29815 -r bd7011246fab mercurial/commands.py
--- a/mercurial/commands.py	Tue Dec 05 16:33:40 2006 +0100
+++ b/mercurial/commands.py	Tue Dec 05 13:41:42 2006 -0800
@@ -2189,7 +2189,7 @@
     necessary.  The file '.hg/localtags' is used for local tags (not
     shared among repositories).
     """
-    if name in ['tip', '.']:
+    if name in ['tip', '.', 'null']:
         raise util.Abort(_("the name '%s' is reserved") % name)
     if rev_ is not None:
         ui.warn(_("use of 'hg tag NAME [REV]' is deprecated, "
diff -r 630caaf29815 -r bd7011246fab mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Dec 05 16:33:40 2006 +0100
+++ b/mercurial/localrepo.py	Tue Dec 05 13:41:42 2006 -0800
@@ -376,6 +376,8 @@
             key = self.dirstate.parents()[0]
             if key == nullid:
                 raise repo.RepoError(_("no revision checked out"))
+        elif key == 'null':
+            return nullid
         n = self.changelog._match(key)
         if n:
             return n