michaeltchapman/puppet-galera — pull request #19 by matthewfischer (2014-12-02 21:32:02+00:00)
Title: Allow overriding of available_when_readonly

There are cases when you need to override the default puppet setting for
available_when_readonly, such as when doing a rolling upgrade of mysql.
This allows the value to be set. We intentionally use an environment
variable rather than a positional one to avoid having to set the other
vars.