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Create bootable ISO from HighSierra Installer
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| # Generate a BaseSystem.dmg with 10.13 Install Packages | |
| hdiutil attach /Applications/Install\ macOS\ 10.13\ Beta.app/Contents/SharedSupport/InstallESD.dmg -noverify -mountpoint /Volumes/highsierra | |
| hdiutil create -o /tmp/HighSierraBase.cdr -size 7316m -layout SPUD -fs HFS+J | |
| hdiutil attach /tmp/HighSierraBase.cdr.dmg -noverify -mountpoint /Volumes/install_build | |
| asr restore -source /Applications/Install\ macOS\ 10.13\ Beta.app/Contents/SharedSupport/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase | |
| cp -R /Volumes/highsierra/Packages /Volumes/OS\ X\ Base\ System/System/Installation | |
| hdiutil detach /Volumes/OS\ X\ Base\ System/ | |
| hdiutil detach /Volumes/highsierra/ | |
| mv /tmp/HighSierraBase.cdr.dmg /tmp/BaseSystem.dmg | |
| # Restore the 10.13 Installer's BaseSystem.dmg into file system and place custom BaseSystem.dmg into the root | |
| hdiutil create -o /tmp/HighSierra.cdr -size 8965m -layout SPUD -fs HFS+J | |
| hdiutil attach /tmp/HighSierra.cdr.dmg -noverify -mountpoint /Volumes/install_build | |
| asr restore -source /Applications/Install\ macOS\ 10.13\ Beta.app/Contents/SharedSupport/BaseSystem.dmg -target /Volumes/install_build -noprompt -noverify -erase | |
| cp /tmp/BaseSystem.dmg /Volumes/OS\ X\ Base\ System | |
| hdiutil detach /Volumes/OS\ X\ Base\ System/ | |
| hdiutil convert /tmp/HighSierra.cdr.dmg -format UDTO -o /tmp/HighSierra.iso | |
| mv /tmp/HighSierra.iso.cdr ~/Desktop/HighSierra.iso | |
| rm /tmp/HighSierra.cdr.dmg |
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