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@selahssea-zz
Created January 21, 2016 08:52
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Create bootable OS X El Capitan ISO
#!/bin/bash
# Mount the installer image
hdiutil attach /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/SharedSupport/InstallESD.dmg -noverify -nobrowse -mountpoint /Volumes/install_app
# Create the ElCapitan Blank ISO Image of 7316mb with a Single Partition - Apple Partition Map
hdiutil create -o /tmp/ElCapitan.cdr -size 7316m -layout SPUD -fs HFS+J
# Mount the ElCapitan Blank ISO Image
hdiutil attach /tmp/ElCapitan.cdr.dmg -noverify -nobrowse -mountpoint /Volumes/install_build
# Restore the Base System into the ElCapitan Blank ISO Image
asr restore -source /Volumes/install_app/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase
# Remove Package link and replace with actual files
rm /Volumes/OS\ X\ Base\ System/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/OS\ X\ Base\ System/System/Installation/
# Copy El Capitan installer dependencies
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
# Unmount the installer image
hdiutil detach /Volumes/install_app
# Unmount the ElCapitan ISO Image
hdiutil detach /Volumes/OS\ X\ Base\ System/
# Convert the ElCapitan ISO Image to ISO/CD master (Optional)
hdiutil convert /tmp/ElCapitan.cdr.dmg -format UDTO -o /tmp/ElCapitan.iso
# Rename the ElCapitan ISO Image and move it to the desktop
mv /tmp/ElCapitan.iso.cdr ~/Desktop/ElCapitan.iso
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