Re-syncing if writes go to slave

[Andrew Brosnan]

Hello,

The setup I am working on has one master and one slave on separate
machines. If the master goes down, all reads and writes will be sent to
the slave.

What are the options for restoring the master to reflect changes made on
the slave while the master was down? I know how I could do it manually,
but I need to automate it.

I can't use a Master<->Master setup for reasons out of my control.

Thank you,
Andrew