#
#
# patch "setup.py"
#  from [e7a29a586a2957f991598466701a6dd698593c27]
#    to [ef7120cb5380665df5f61b47f1c1878b1c21252d]
# 
# patch "tracmtn/backend.py"
#  from [7f2e7ecbe83151dd5bfa660f09311d0a361102ae]
#    to [64899332a0a2b585784c36c0c24787b1bec1705f]
#
============================================================
--- setup.py	e7a29a586a2957f991598466701a6dd698593c27
+++ setup.py	ef7120cb5380665df5f61b47f1c1878b1c21252d
@@ -29,7 +29,7 @@ setup(
 setup(
     name = 'TracMonotone',
     keywords = 'trac monotone scm plugin mtn',
-    version = '0.0.12',
+    version = '0.0.13',
     author = 'Thomas Moschny',
     author_email = 'address@hidden',
     packages = ['tracmtn'],
============================================================
--- tracmtn/backend.py	7f2e7ecbe83151dd5bfa660f09311d0a361102ae
+++ tracmtn/backend.py	64899332a0a2b585784c36c0c24787b1bec1705f
@@ -60,6 +60,14 @@ INTERFACE_VERSIONS = {
     '6.0': '0.37-0.38',
 }
 
+
+class MultipleChangesets(TracError):
+    def __init__(self, rev):
+        TracError.__init__(
+            self, "Multiple revisions found for '%s'" % rev,
+            title="Ambiguous changeset Number")
+
+
 class MonotoneConnector(Component):
     """
     Provides this plugin's functionality.
@@ -289,6 +297,12 @@ class MonotoneRepository(Repository):
         revision 'rev'.
         """
         rev = self.normalize_rev(rev)
+        return self._get_changeset(rev)
+
+    def _get_changeset(self, rev):
+        """
+        Like get_changeset, but skips the revision normalization.
+        """
         try:
             return MonotoneChangeset(self.mtn, rev, self.revpropspec)
         except AutomateException:
@@ -300,7 +314,7 @@ class MonotoneRepository(Repository):
         """
         for rev in self.mtn.select('l:%s/e:%s' %
                 (format_datetime(start), format_datetime(stop))):
-            yield self.get_changeset(rev)
+            yield self._get_changeset(rev)
 
     def get_node(self, path, rev=None):
         """
@@ -314,7 +328,7 @@ class MonotoneRepository(Repository):
         # version of a path.
 
         # FIXME: normalize_rev can be skipped when called by ourselves
-        rev = self.normalize_rev(rev) or self.get_youngest_rev()
+        rev = self.normalize_rev(rev)
         path = self.normalize_path(path)
         try:
             return MonotoneNode(self.mtn, rev, path)
@@ -402,23 +416,30 @@ class MonotoneRepository(Repository):
         return '/' + (path and path.strip('/') or '')
 
     def normalize_rev(self, rev):
+        """Return a canonical representation of a revision.
+        
+        It's up to the backend to decide which string values of `rev`
+        (usually provided by the user) should be accepted, and how
+        they should be normalized. Some backends may for instance want
+        to match against known tags or branch names.
+        
+        In addition, if `rev` is `None` or '', the youngest revision
+        should be returned.
         """
-        Return a canonical representation of a revision in the repos.
-        'None' is a valid revision value and represents the youngest
-        revision. It should simply be passed through.
-        """
-        if rev != None:
-            if REVID_RULE.match(rev):
-                # already a single revision id, not passed to select
-                pass
-            else:
-                revs = self.mtn.select(rev)
-                if len(revs) != 1:
-                    raise NoSuchChangeset(rev)
-                rev = revs[0]
-            rev = rev.encode('ascii')
-        return rev
+        if rev is None or isinstance(rev, basestring) and \
+                rev.lower() in ('', 'none', 'latest', 'youngest'):
+            return self.youngest_rev
 
+        if not REVID_RULE.match(rev):
+            # doesn't look like a hash, pass to mtn's select
+            revs = self.mtn.select(rev)
+            if len(revs) < 1:
+                raise NoSuchChangeset(rev)
+            elif len(revs) > 1:
+                raise MultipleChangesets(rev)
+            rev = revs[0]
+        return rev.encode('ascii')
+
     def short_rev(self, rev):
         """
         Return a compact representation of a revision in the repos.