# HG changeset patch
# User Bryan O'Sullivan <bos@serpentine.com>
# Date 1191358132 25200
# Node ID 4fbd27bf04b1b97a567c2834f42a1a817fe67cd2
# Parent  c6adf2be6069c206a4104dc28adfedcf296b8a46
convert: fail properly if we can't read a source hg repository

diff --git a/hgext/convert/hg.py b/hgext/convert/hg.py
--- a/hgext/convert/hg.py
+++ b/hgext/convert/hg.py
@@ -156,7 +156,10 @@ class mercurial_sink(converter_sink):
 class mercurial_source(converter_source):
     def __init__(self, ui, path, rev=None):
         converter_source.__init__(self, ui, path, rev)
-        self.repo = hg.repository(self.ui, path)
+        try:
+            self.repo = hg.repository(self.ui, path)
+        except:
+            raise NoRepo("could not open hg repo %s as source" % path)
         self.lastrev = None
         self.lastctx = None