Bash script to create a Bootable ISO from macOS Sierra Install Image from Mac App Store

sierra_dmg_to_iso.sh

#!/bin/bash
#
# Bash script to create a Bootable ISO from macOS Sierra Install Image from Mac App Store
#
# Credits to fuckbecauseican5 from https://www.reddit.com/r/hackintosh/comments/4s561a/macos_sierra_16a238m_install_success_and_guide/
# Adapted to work with the official image available into Mac App Store
#
# Save as a text file; open terminal; enter the command line: sh sierra_bootable.sh
#
# Used on "macOS Sierra 10.12.6" build 16G29
#
# The resulting ISO was used to create a fresh Virtual Machine in vSphere
#
hdiutil attach /Applications/Install\ macOS\ Sierra.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil create -o /tmp/Sierra.cdr -size 6144m -layout SPUD -fs HFS+J
hdiutil attach /tmp/Sierra.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/iso
asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/iso -noprompt -noverify -erase
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/
cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/
hdiutil detach /Volumes/install_app
hdiutil detach /Volumes/OS\ X\ Base\ System/
hdiutil convert /tmp/Sierra.cdr.dmg -format UDTO -o /tmp/macOS_Sierra_10.12.6.03.iso
mv /tmp/macOS_Sierra_10.12.6.03.iso.cdr ~/Desktop/macOS_Sierra_10.12.6.03.iso
rm /tmp/Sierra.cdr.dmg