#!/bin/sh

output_config() {
    echo "graph_title MySQL - Value of expire_logs_days variable"
    echo "graph_category mysql"
    echo "binlogdays.label Number of days of storage of binary logs"
    echo "binlogdays.draw AREA"
    echo 'graph_args -l 0'
    echo 'graph_scale no'    
}

output_values() {
    printf "binlogdays.value %d\n" $(binlog_days)
}

binlog_days() {
    mysql --skip-column-names --silent --execute "show variables like 'expire_logs_days';" | awk '{print $2}'
}

output_usage() {
    printf >&2 "%s - munin plugin to graph value of MySQL expire_logs_days system variable\n" ${0##*/}
    printf >&2 "Usage: %s [config]\n" ${0##*/}
}

case $# in
    0)
        output_values
        ;;
    1)
        case $1 in
            config)
                output_config
                ;;
            *)
                output_usage
                exit 1
                ;;
        esac
        ;;
    *)
        output_usage
        exit 1
        ;;
esac