passwordmgr.readauthtoken() has been moved into a utility function

mercurial_keyring.py

@@ -229,8 +229,17 b' class HTTPPasswordHandler(object):'
         local_ui = _ui(ui)
         if repo_root:
             local_ui.readconfig(os.path.join(repo_root, ".hg", "hgrc"))
-        local_passwordmgr = passwordmgr(local_ui)
-        auth_token = local_passwordmgr.readauthtoken(base_url)
+        try:
+            local_passwordmgr = passwordmgr(local_ui)
+            auth_token = local_passwordmgr.readauthtoken(base_url)
+        except AttributeError:
+            # hg 1.8
+            from mercurial.url import readauthforuri
+            res = readauthforuri(local_ui, base_url)
+            if res:
+                group, auth_token = res
+            else:
+                auth_token = None
         if auth_token:
             username = auth_token.get('username')
             password = auth_token.get('password')