#!/bin/bash
set -x
set -e

yum -y install psmisc

echo "Creating /tmproot..."
install -Ddm 000755 /tmp/tmproot

echo "Mounting tmpfs to /tmp/tmproot..."
mount none /tmp/tmproot -t tmpfs

echo "Copying / to /tmp/tmproot..."
cp -ax / /tmp/tmproot

echo "Copying dev-nodes to /tmp/tmproot..."
cp -a /dev /tmp/tmproot# Switch / to tmpfs

echo "Creating /tmp/tmproot/oldroot..."
mkdir /tmp/tmproot/oldroot

echo "Prepare for pivot_root action..."
mount --make-rprivate /

echo "Execute pivot_root..."
pivot_root /tmp/tmproot /tmp/tmproot/oldroot

echo "Move sub-mounts into /oldroot..."
mount --move /oldroot/dev /dev
mount --move /oldroot/proc /proc
mount --move /oldroot/sys /sys
mount --move /oldroot/run /run
mount --move /oldroot/tmp /tmp || true

MOUNTS=$(
    cut -d ' ' -f 2 /proc/mounts | \
    grep '/oldroot/' | \
    sort -ru
)
echo "$MOUNTS" | while IFS= read -r MOUNT
do
    echo "Attempting to dismount ${MOUNT}... "
    umount "$MOUNT" || \
      echo "Dismount failed for ${MOUNT}"
done


if systemctl is-active --quiet firewalld ; then systemctl stop firewalld ; fi

systemctl restart sshd

pkill --signal HUP sshdExpected results

systemctl daemon-reexec

fuser -vmk /oldroot

umount /oldroot 

# dd if=/dev/zero of=<ROOT_DEV_PATH> bs=512 count=$(( 2 * 1024 * 10 )) 

# parted -s /dev/nvme0n1 -- mktable gpt \
  mkpart primary xfs 1049k 2m \
  mkpart primary fat16 4096s 130m \
  mkpart primary xfs 130m 642m \
  mkpart primary xfs 642m 100% \
  set 1 bios_grub on \
  set 2 esp on \
  set 3 bls_boot on \
  set 4 lvm on

Error: Partition(s) 4 on /dev/nvme0n1 have been written, but we have been unable to inform the kernel of the change, probably because it/they are in use.  As a result, the old partition(s) will remain in use.  You should reboot now before making further changes.