Issue 4319 - [hgreview] Make sure reviews for the initial repository revision can be created

hgreview.py

 import BaseHTTPServer
 import os
 import re
 import socket
 import sys
 import urllib
 
 from mercurial import cmdutil, error
 
 SERVER = 'https://codereview.adblockplus.org'
@@ skipping 29 matching lines @@
         args.append('--verbose')
     elif ui.quiet:
         args.append('--quiet')
 
     if not opts.get('issue') or opts.get('message'):
         args.append('--send_mail')
 
     if opts.get('revision') and opts.get('change'):
         raise error.Abort('Ambiguous revision range, only one of --revision and --change can be specified.')
     if opts.get('change'):
-        args.extend(['--rev', '{0}^:{0}'.format(opts['change'])])
+        rev = repo[opts['change']]
+        args.extend(['--rev', '{}:{}'.format(rev.parents()[0], rev)])
     elif opts.get('revision'):
         args.extend(['--rev', opts['revision']])
     else:
         raise error.Abort('What should be reviewed? Either --revision or --change is required.')
 
     if not opts.get('issue'):
         # New issue, make sure title and message are set
         if not opts.get('title') and opts.get('change'):
             opts['title'] = repo[opts['change']].description()
         if not opts.get('title'):
@@ skipping 87 matching lines @@
   </body>
 </html>
 ''' % port
 
     # Run the upload tool
     issue, patchset = scope['RealMain']([upload_path] + args)
 
     # Wait for the page to check in and retrieve issue URL
     if server:
         server.handle_request()