Script to use qemu-nbd to edit a locked image (cloud-init)

chroot-nbd

#!/bin/bash

MOUNTPOINT=/mnt/tmp_nbd
IMAGE=$1
PARTITION=${2:-/dev/nbd0p1}

if [[ $EUID -ne 0 ]]; then
    echo "This script must be run as root"
    exit 1
fi


modprobe nbd max_part=4
qemu-nbd --connect=/dev/nbd0 $1
sleep 2
mkdir -p $MOUNTPOINT
mount $PARTITION $MOUNTPOINT

chroot $MOUNTPOINT

umount $MOUNTPOINT
qemu-nbd --disconnect /dev/nbd0