datasync_get_hosts() misread the 'datasync_hosts' host variables.

Just did a basic ugly debug output (file datasync.hosts.inc, around line 55):

  print_r($ret);die();
  return (($get_host === NULL) ? $ret : $ret[$get_host]);
}

My 'datasync_hosts' variable has this data:

preprod-drupal01
guinevere
www.somehost.net
localhost

When running the cron using Drush, this what I get:

pounard@guinevere:/var/www/mysite/drupal-dr/www$ drush cron
Array
(
    [preprod-drupal01] => Array
        (
            [run_post_hook] => 1
        )

)
Drush command could not be completed.

My current hostname is 'guinevere', the datasync_get_hosts() function does care only about the first line.

So, I did rewrite your function with a preg_split() instead of the str_replace() and explode() function usage, which is a bit more tolerant with whitespaces (among other things).

Running back my cron, I get:

pounard@guinevere:/var/www/mysite/drupal-dr/www/sites/all/modules/contrib/datasync$ drush cron
Array
(
    [preprod-drupal01] => Array
        (
            [run_post_hook] => 1
        )

    [guinevere] => Array
        (
            [run_post_hook] => 1
        )

    [www.somehost.net] => Array
        (
            [run_post_hook] => 1
        )

    [localhost] => Array
        (
            [run_post_hook] => 1
        )

)
Drush command could not be completed.

Which is a lot better, because this time the DataSync cron does run this time.

Patch attached, for the latest release (without the ugly debugging thing).