BACKUP=kvm-backup-2018-1.tar.xz
setopt extendedglob
VGNAME=$(vgs --noheadings -o vg_name) && [[ -n $VGNAME ]] && vgremove -fv $VGNAME
if [[ -z $DISK ]]; then
    typeset -a devs
    devs=( $(blkid -o export -s TYPE | awk -vRS="" -vFS="\n" '/TYPE=(ext|ntfs|btrfs|xfs)/{print $1}') )
    if (( $#devs!= 1 )); then
        print "failed to detect block device, consider using DISK=/dev/sdX"
    else
        DISK=${${devs[1]##*=}%%[[:digit:]]##}
    fi
fi
if [[ ! -b $DISK ]]; then
    print "$DISK is not a block device"
else
    cd /root
    sgdisk -Z $DISK
    sgdisk -n 0:0:+1024M $DISK
    sgdisk -n 0:0:+100M $DISK
    sgdisk -n 0:0:0 $DISK
    sgdisk -c 1:vm_swap $DISK
    sgdisk -c 2:vm_boot $DISK
    sgdisk -c 3:vm_root $DISK
    sgdisk -t 1:8200 $DISK
    sgdisk -t 2:ef02 $DISK
    partprobe $DISK
    mkswap -L vm_swap ${DISK}1
    mkfs.btrfs -f -L vm_root ${DISK}3
    swapon LABEL=vm_swap
    mount LABEL=vm_root /mnt/gentoo
    cd /mnt/gentoo
    wget --user=vps --password=VtufcblboT http://megaseed.kz/vps/$BACKUP
    tar --numeric-owner -xvpf $BACKUP -C /mnt/gentoo
fi