#!/bin/bash

LEVEL='0'
PROG_NAME="$(basename $0)"
XFSDUMP='/usr/bin/xfsdump'
DESTINATION="/backup"
SESSION_LABEL="weekly"
MEDIA_LABEL="root-fs"
FILESYSTEM="/"

usage() {
    printf "Usage: %s (--weekly | --daily | --hourly) [--file-system=fs] [--help]\n" $PROG_NAME > /dev/stderr
}

while [[ $# -gt 0 ]]; do
    case $1 in
        --weekly)
            LEVEL='0'
            SESSION_LABEL="weekly"
            ;;
        --daily)
            LEVEL='1'
            SESSION_LABEL="daily"
            ;;
        --hourly)
            LEVEL='2'
            SESSION_LABEL="hourly"
            ;;
        --file-system=*)
            FILESYSTEM=$(echo $1 | sed "s|--file-system=||g")
            ;;
        --help)
            usage
            exit 1
            ;;
        *)
            printf "Error: Unknown flag '%s'\n" $1 > /dev/stderr
            usage
            exit 1
            ;;
    esac

    shift
done

DESTINATION="$DESTINATION/backup-$(date +'%Y-%m-%d').$LEVEL.dump"

$XFSDUMP -l $LEVEL -L $SESSION_LABEL  -M $MEDIA_LABEL -f $DESTINATION $FILESYSTEM