create_mac_iso.sh

#!/bin/bash

# ==============================================================
# How to make an ISO from the "Install $OS_NAME.app"
# ==============================================================
OS_NAME="${1:-macOS Sierra}"
SHORT_NAME="${2:-macOS}"
INSTALLER_PATH="/Applications/Install $OS_NAME.app"
IMAGE_PATH="/tmp/$SHORT_NAME"

echo
echo Mount the installer image
echo -----------------------------------------------------------
echo $ hdiutil attach "$INSTALLER_PATH"/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil attach "$INSTALLER_PATH"/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app

echo
echo Create $SHORT_NAME blank ISO image with a Single Partition - Apple Partition Map
echo --------------------------------------------------------------------------
echo $ hdiutil create -o $IMAGE_PATH -size 8g -layout SPUD -fs HFS+J -type SPARSE
hdiutil create -o $IMAGE_PATH -size 8g -layout SPUD -fs HFS+J -type SPARSE

echo
echo Mount the sparse bundle for package addition
echo --------------------------------------------------------------------------
echo $ hdiutil attach $IMAGE_PATH.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
hdiutil attach $IMAGE_PATH.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build

echo
echo Restore the Base System into the $SHORT_NAME ISO image
echo --------------------------------------------------------------------------
echo $ asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase
asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase

echo
echo Remove Package link and replace with actual files
echo --------------------------------------------------------------------------
echo $ rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
echo $ cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/

echo
echo Copy $OS_NAME installer dependencies
echo --------------------------------------------------------------------------
echo $ cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/BaseSystem.chunklist
cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/OS\ X\ Base\ System/BaseSystem.chunklist
echo $ cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/BaseSystem.dmg
cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/OS\ X\ Base\ System/BaseSystem.dmg

echo
echo Unmount the installer image
echo --------------------------------------------------------------------------
echo $ hdiutil detach /Volumes/install_app
hdiutil detach /Volumes/install_app

echo
echo Unmount the sparse bundle
echo --------------------------------------------------------------------------
echo $ hdiutil detach /Volumes/OS\ X\ Base\ System/
hdiutil detach /Volumes/OS\ X\ Base\ System/

echo
echo Resize the partition in the sparse bundle to remove any free space
echo --------------------------------------------------------------------------
echo $ hdiutil resize -size `hdiutil resize -limits $IMAGE_PATH.sparseimage | tail -n 1 | awk '{ print $1 }'`b $IMAGE_PATH.sparseimage
hdiutil resize -size `hdiutil resize -limits $IMAGE_PATH.sparseimage | tail -n 1 | awk '{ print $1 }'`b $IMAGE_PATH.sparseimage

echo
echo Convert the sparse bundle to ISO/CD master
echo --------------------------------------------------------------------------
echo $ hdiutil convert $IMAGE_PATH.sparseimage -format UDTO -o $IMAGE_PATH
hdiutil convert $IMAGE_PATH.sparseimage -format UDTO -o $IMAGE_PATH

echo
echo Remove the sparse bundle
echo --------------------------------------------------------------------------
echo $ rm $IMAGE_PATH.sparseimage
rm $IMAGE_PATH.sparseimage

echo
echo Rename the ISO and move it to the desktop
echo --------------------------------------------------------------------------
echo $ mv $IMAGE_PATH.cdr ~/Desktop/$SHORT_NAME.iso
mv $IMAGE_PATH.cdr ~/Desktop/$SHORT_NAME.iso