diff mercurial/scmutil.py @ 17817:b17be267b59c

scmutil: add function to validate new branch, tag, and bookmark names

For now the new function only checks to make sure the new label name
isn't a reserved name ('tip', '.', or 'null'). Eventually more of the
checks will be unified between the different types of labels.

The `tag` command is trivially updated to use it. Updating branches and
bookmarks to use it is slightly more invasive and thus reserved for
later patches.

--- a/mercurial/scmutil.py	Wed Oct 17 16:32:43 2012 -0500
+++ b/mercurial/scmutil.py	Wed Oct 17 16:34:46 2012 -0500
@@ -27,6 +27,10 @@
     else:
         ui.status(_("no changes found\n"))
 
+def checknewlabel(repo, lbl):
+    if lbl in ['tip', '.', 'null']:
+        raise util.Abort(_("the name '%s' is reserved") % lbl)
+
 def checkfilename(f):
     '''Check that the filename f is an acceptable filename for a tracked file'''
     if '\r' in f or '\n' in f: