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Convert macOS installer for use in VirtualBox
# Disclaimer: never got this to work properly and have not attempted it since.
# This will require about 30GB of space, still in experimental phase right now
sudo gem install iesd
cd /Applications # Or wherever you hve the "Install 10.12 Developer" available
iesd -i Install\ 10.12\ Developer\ -o macos.dmg -t BaseSystem
hdiutil convert macos.dmg -format UDSP -o macos.sparseimage
# You can cloase any popup finder windows
hdiutil mount Install\ 10.12\ Developer\
hdiutil mount macos.sparseimage
cp /Volumes/OS\ X\ Install\ ESD/BaseSystem.* /Volumes/OS\ X\ Base\ System/
# We use the finder to eject here, based on this OSX Daily tip
osascript -e 'tell application "Finder" to eject (every disk whose ejectable is true)'
hdiutil convert macos.sparseimage -format UDZO -o macos_vm.dmg
# You can now delete any of the original resources if you no longer need them
rm -rf macos.dmg
rm -rf macos.sparseimage
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