Script to Convert OSX app Image to Bootable iso

create-iso.sh

#!/bin/bash

# tested for Yosemite, ElCapitan and Sierra

print_usage () {
  echo "usage: ${0} path_to_app"
  exit -1;
}

if [ $# -ne 1 ]; then
  echo "error: argument missing"
  print_usage
fi
if [ ! -f "${1}/Contents/SharedSupport/InstallESD.dmg" ]; then
  echo "error: expect command line argument to be path to osx .app directory"
  print_usage
fi
APP_NICK="$(basename "${1}")";

hdiutil attach "${1}/Contents/SharedSupport/InstallESD.dmg" -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil create -o "/tmp/${APP_NICK}.cdr" -size 7316m -layout SPUD -fs HFS+J
hdiutil attach "/tmp/${APP_NICK}.cdr.dmg" -noverify -nobrowse -mountpoint /Volumes/install_build
asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/BaseSystem.chunklist
cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/BaseSystem.dmg
hdiutil detach /Volumes/install_app
hdiutil detach /Volumes/OS\ X\ Base\ System/
hdiutil convert "/tmp/${APP_NICK}.cdr.dmg" -format UDTO -o "/tmp/${APP_NICK}.iso"
mv "/tmp/${APP_NICK}.iso.cdr" "~/Desktop/${APP_NICK}.iso"
rm "/tmp/${APP_NICK}.cdr.dmg"

DST="~/Desktop/${APP_NICK}.iso"
if [ -f ${DST} ]; then
  echo "${DST}"
  exit 0
fi
exit -1