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# Generate a BaseSystem.dmg with 10.13 Install Packages | |
hdiutil attach /Applications/Install\ macOS\ High\ Sierra.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\ High\ Sierra.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 |