#!/usr/bin/env bash
# Inspired from https://rook.io/docs/rook/v1.7/ceph-teardown.html

if [ $# -ne 1 ]; then
    echo $0 disk
    echo f.i. $0 /dev/sdx
    exit 1
fi

DISK="$1"; shift

# Zap the disk to a fresh, usable state (zap-all is important, b/c MBR has to be clean)

# You will have to run this step for all disks.
sgdisk --zap-all $DISK

# Clean hdds with dd
dd if=/dev/zero of="$DISK" bs=1M count=100

# Clean disks such as ssd with blkdiscard instead of dd
blkdiscard $DISK

# These steps only have to be run once on each node
# If rook sets up osds using ceph-volume, teardown leaves some devices mapped that lock the disks.
ls /dev/mapper/ceph-* | xargs -I% -- dmsetup remove %

# ceph-volume setup can leave ceph-<UUID> directories in /dev and /dev/mapper (unnecessary clutter)
rm -rf /dev/ceph-*
rm -rf /dev/mapper/ceph--*

# Inform the OS of partition table changes
partprobe $DISK