Comment 7 for bug 359341

Seems To be still present in 1.4:

101126 15:28:14 innobackupex-1.5.1: Connected to database with mysql child process (pid=8486)
101126 15:28:20 innobackupex-1.5.1: Connection to database server closed
IMPORTANT: Please check that the backup run completes successfully.
           At the end of a successful backup run innobackupex-1.5.1
           prints "completed OK!".

innobackupex-1.5.1: Using mysql Ver 14.14 Distrib 5.1.49, for unknown-linux-gnu (x86_64) using readline 5.1
innobackupex-1.5.1: Using mysql server version Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.

innobackupex-1.5.1: fatal error: no 'mysqld' group in MySQL options
innobackupex-1.5.1: fatal error: OR no 'datadir' option in group 'mysqld' in MySQL options