Comment 2 for bug 1078847

@Mike,

innobackupex already supports --defaults-extra-file but with a
caveat of being able to only pass either --defaults-extra-file or
--defaults-file but not both. You can look at lp:740489 for
details.

The !include directive may help if you intend to use same
connection parameters as that of your mysql client. The included file is
processed with the privileges of client opening it. So, in case
you are innobackupex as a different user, there is a way where
you can !include a file which can be read only by the
innobackupex user but not by mysql user.