# vim: syntax=upstart
description "Set mysql server_id based on instance-id"

start on starting mysql
task

env INSTANCE_ID="/var/lib/cloud/data/instance-id"
env CONF_TARGET="/etc/mysql/conf.d/server_id.cnf"

pre-start script
    if ! [ -e $INSTANCE_ID ] ; then
        stop
        exit 0
    fi
end script

script
    instance=$(cat $INSTANCE_ID)
    server_id=$(python -c "print 0x${instance##i-}")
    cat > $CONF_TARGET.new <<EOF
# Generated by mysql-set-server-id upstart job $(date)
# From $INSTANCE_ID ${instance}
[mysqld]
server_id = $server_id
EOF
    mv -f $CONF_TARGET.new $CONF_TARGET
end script