holland-xtrabackup dry run does not check for innobackup parse error

[MikeG]

Currently if you have innodb=force in my.cnf, xtrabackup will fail:

https://bugs.launchpad.net/bugs/528752

If you have this option in my.cnf, a dry run will indicate a backup should succeed and it will later fail with xtrabackup: ambiguous option '--innodb=force'

During --dry-run, we should run if xtrabackup --help --verbose or some similar quick check that there are no errors

[Andrew Garner (muzazzi)]

This is probably a good idea. We should do the same with other plugins that run commands too (like mysqldump) that have some sort of "safe mode" to catch any obvious errors in execution.

[Andrew Garner (muzazzi)]

holland-xtrabackup runs xtrabackup with --defaults-file=${holland-defaults} --help to verify the defaults file will be usable by xtrabackup. Further, xtrabackup upstream has finally merged a fix for --innobackup=force in recent versions.