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corysolovewicz/CreateBootableISOfromMacOSHighSierraInstaller.sh

Last active October 9, 2019 17:02
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Create bootable ISO from macOS High Sierra Installer
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CreateBootableISOfromMacOSHighSierraInstaller.sh
# Download macOS High Sierra Installer
# https://itunes.apple.com/us/app/macos-high-sierra/id1246284741?ls=1&mt=12
# create blank image and put in /tmp directory
hdiutil create -o /tmp/HighSierra.cdr -size 5200m -layout SPUD -fs HFS+J
# mount blank image at install_build
hdiutil attach /tmp/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/install_build
# run the createinstallmedia on the target /Volumes/install_build
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build
# move populated image to Desktop and name it InstallSystem.dmg
mv /tmp/HighSierra.cdr.dmg ~/Desktop/InstallSystem.dmg
# unmount High Sierra install
hdiutil detach /Volumes/Install\ macOS\ High\ Sierra
# convert dmg to iso
hdiutil convert ~/Desktop/InstallSystem.dmg -format UDTO -o ~/Desktop/HighSierra.iso
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