Carp: looking for tool to make failover system.

[Xavier Beaudouin]

Hello there,

Before I remake the wheel, I am looking if someone has done some kind  
of software that
can monitor a carp interface and execute a script that can execute  
some basic things.

Idea is to make 2 mysql servers and start the "backup" one only if  
carp status move from BACKUP state to MASTER.

Since I use SAN, some check has to be done (a quick fsck to see if  
filesystem is clean, remonting it from read only to read / write,
mail to administrators to tell'em the mysql server has moved from  
master to slave).

Is there anybody here that has done some tool like this (daemon is  
possible...)... ?

THanks,
/xavier