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hdiutil attach /Applications/Install\ OS\ X\ El\ -noverify -nobrowse -mountpoint /Volumes/install_app
hdiutil convert /Volumes/install_app/BaseSystem.dmg -format UDSP -o /tmp/El\ Capitan
hdiutil resize -size 9g /tmp/El\ Capitan.sparseimage
hdiutil attach /tmp/El\ Capitan.sparseimage -noverify -nobrowse -mountpoint /Volumes/install_build
rm /Volumes/install_build/System/Installation/Packages
cp -rp /Volumes/install_app/Packages /Volumes/install_build/System/Installation/
cp -rp /Volumes/install_app/BaseSystem.chunklist /Volumes/install_build
cp -rp /Volumes/install_app/BaseSystem.dmg /Volumes/install_build
hdiutil detach /Volumes/install_app
hdiutil detach /Volumes/install_build
hdiutil resize -size `hdiutil resize -limits /tmp/El\ Capitan.sparseimage | tail -n 1 | awk '{ print $1 }'`b /tmp/El\ Capitan.sparseimage
hdiutil convert /tmp/El\ Capitan.sparseimage -format UDTO -o /tmp/El\ Capitan
rm /tmp/El\ Capitan.sparseimage
mv /tmp/El\ Capitan.cdr ~/Desktop/El\ Capitan.iso
sudo drutil burn ~/Desktop/El\ Capitan.iso
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