#!/bin/sh

# Copyright (c) ULBSD Project Team. All rights reserved.
# $Id: ulbsd-clone-zfs 2 2020-04-06 16:44:15Z sv $

work_disk=$1
swap_size=$2
mnt_dir=$3
label=$4

zpool list -H -o name | while read pool; do
    zpool export -f $pool
done
cd /tmp && rm -Rf *

gpart destroy -F ${work_disk}

diskinfo ${work_disk} | while read disk sectorsize size sectors other
do
# Delete MBR and partition table
    dd if=/dev/zero of=/dev/${disk} bs=${sectorsize} count=65536
# Delete GEOM metadata
    dd if=/dev/zero of=/dev/${disk} bs=${sectorsize} oseek=`expr $sectors - 65536`
done

gpart create -s GPT ${work_disk}
gpart add -b 34 -t freebsd-boot -a 4k -i 1 -l boot -s 512k ${work_disk}
gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ${work_disk}
gpart add -t efi -a 4k -i 2 -l efi -s 1M ${work_disk}

if [ "${swap_size}" -gt "0" ]
then
    gpart add -t freebsd-swap -a 4k -i 4 -l swap -s ${swap_size}M ${work_disk}
fi

gpart add -t freebsd-zfs -a 4k -i 3 -l ${label} ${work_disk}
gpart show ${work_disk}

newfs_msdos /dev/${work_disk}p2
mount -t msdosfs /dev/${work_disk}p2 ${mnt_dir}
mkdir -p ${mnt_dir}/EFI/BOOT
cp /boot/boot1.efi ${mnt_dir}/EFI/BOOT/BOOTX64.efi
echo 'BOOTX64.efi' >> ${mnt_dir}/EFI/BOOT/startup.nsh
sync
umount -f ${mnt_dir}

gnop create -S 4096 /dev/gpt/${label}
zpool create -f -m / -o altroot=${mnt_dir} -o cachefile=/tmp/zpool.cache ${label} /dev/gpt/${label}.nop
zpool export ${label}
gnop destroy /dev/gpt/${label}.nop
zpool import -o altroot=${mnt_dir} -o cachefile=/tmp/zpool.cache ${label}

zpool set bootfs=${label} ${label}
zfs set checksum=fletcher4 ${label}
zfs set atime=off ${label}

zfs create ${label}/usr
zfs create ${label}/home
zfs create ${label}/var
zfs create -o compression=on -o exec=on -o setuid=off ${label}/tmp
zfs create -o compression=lzjb -o setuid=off ${label}/usr/ports
zfs create -o compression=off -o exec=off -o setuid=off ${label}/usr/ports/distfiles
zfs create -o compression=off -o exec=off -o setuid=off ${label}/usr/ports/packages
zfs create -o compression=lzjb -o exec=off -o setuid=off ${label}/usr/src
zfs create -o compression=lzjb -o exec=off -o setuid=off ${label}/var/crash
zfs create -o exec=off -o setuid=off ${label}/var/db
zfs create -o compression=lzjb -o exec=on -o setuid=off ${label}/var/db/pkg
zfs create -o exec=off -o setuid=off ${label}/var/empty
zfs create -o compression=lzjb -o exec=off -o setuid=off ${label}/var/log
zfs create -o compression=gzip -o exec=off -o setuid=off ${label}/var/mail
zfs create -o exec=off -o setuid=off ${label}/var/run
zfs create -o compression=lzjb -o exec=on -o setuid=off ${label}/var/tmp

zfs set readonly=off ${label}

cd ${mnt_dir}
dump -0Lf - / | restore -rf -
cd /

cp /tmp/zpool.cache ${mnt_dir}/boot/zfs/zpool.cache

if [ -f ${mnt_dir}/restoresymtable ]
then
    rm -f ${mnt_dir}/restoresymtable
fi

if [ -d ${mnt_dir}/.snap ]
then
    rm -Rf ${mnt_dir}/.snap
fi

if [ -f ${mnt_dir}/etc/rc.conf ]
then
    sed -i '' -e '/zfs_enable/Id' ${mnt_dir}/etc/rc.conf
fi

if [ -f ${mnt_dir}/boot/loader.conf ]
then
    sed -i '' -e '/zfs_load/Id; /vfs.root.mountfrom/Id' ${mnt_dir}/boot/loader.conf
fi

echo 'zfs_enable="YES"' >> ${mnt_dir}/etc/rc.conf
echo 'zfs_load="YES"' >> ${mnt_dir}/boot/loader.conf
echo "vfs.root.mountfrom=\"zfs:${label}\"" >> ${mnt_dir}/boot/loader.conf

zfs set readonly=on ${label}/var/empty

if [ -f ${mnt_dir}/etc/fstab ]
then
    cp ${mnt_dir}/etc/fstab ${mnt_dir}/etc/fstab.bak
    sed -i '' -e '/\/dev\/gpt\//Id' ${mnt_dir}/etc/fstab
    if [ "${swap_size}" -gt "0" ]
    then
        echo '/dev/gpt/swap	none	swap	sw	0	0' >> ${mnt_dir}/etc/fstab
    fi
fi

sync
zfs unmount -a
zfs set mountpoint=legacy ${label}
zfs set mountpoint=/tmp ${label}/tmp
zfs set mountpoint=/usr ${label}/usr
zfs set mountpoint=/var ${label}/var

echo 'All done!'
