Deterministic cloud-init iso creation

build.sh

#!/bin/bash

set -e

# Requirements:
# xorriso installed
# user-data and meta-data files in directory

# https://lists.gnu.org/archive/html/bug-xorriso/2015-06/msg00007.html
timestamp="2015060415363300" 

xorriso -as mkisofs -o cloud-init.iso -volid cidata -joliet -rock user-data meta-data -- \
    -volume_date c $timestamp \
    -volume_date m $timestamp \
    -volume_date x $timestamp \
    -volume_date f $timestamp \
    -alter_date b-c $timestamp / -- \
    -alter_date_r c $timestamp / --