mysql_backend with parameters raises TypeError on initenv

[Jun Omae]

When executing initenv command with mysql backend and init_command parameter, it raises TypeError: Connect() keywords must be strings.

Parameters for mysql backend are introduced in [10407], #5120.

$ python trac/admin/console.py /var/trac/1.0-test
Welcome to trac-admin 1.0.2dev
Interactive Trac administration console.
Copyright (C) 2003-2013 Edgewall Software

Type:  '?' or 'help' for help on commands.

Trac [/var/trac/1.0-test]> initenv "Trac 1.0-stable w/ MySQL" "mysql://tracuser:password@localhost/trac_1_0_test?init_command=SET storage_engine%3dMyISAM"
Creating and Initializing Project
Initenv for '/var/trac/1.0-test' failed.
Failed to create environment.
Connect() keywords must be strings
Traceback (most recent call last):
  File "trac/admin/console.py", line 456, in do_initenv
    options=options)
  File "/home/jun66j5/src/trac/edgewall/git/trac/core.py", line 124, in __call__
    self.__init__(*args, **kwargs)
  File "/home/jun66j5/src/trac/edgewall/git/trac/env.py", line 280, in __init__
    self.create(options)
  File "/home/jun66j5/src/trac/edgewall/git/trac/env.py", line 580, in create
    DatabaseManager(self).init_db()
  File "/home/jun66j5/src/trac/edgewall/git/trac/db/api.py", line 251, in init_db
    connector.init_db(**args)
  File "/home/jun66j5/src/trac/edgewall/git/trac/db/mysql_backend.py", line 111, in init_db
    params)
  File "/home/jun66j5/src/trac/edgewall/git/trac/db/mysql_backend.py", line 92, in get_connection
    cnx = MySQLConnection(path, log, user, password, host, port, params)
  File "/home/jun66j5/src/trac/edgewall/git/trac/db/mysql_backend.py", line 275, in __init__
    port=port, charset='utf8', **opts)
TypeError: Connect() keywords must be strings
make: *** [console] Error 1

trac/db/mysql_backend.py

@@ -263 +263 @@
             port = 3306
         opts = {}
         for name, value in params.iteritems():
+            name = name.encode('utf-8')
             if name in ('init_command', 'read_default_file',
                         'read_default_group', 'unix_socket'):
                 opts[name] = value