Created
October 9, 2019 17:08
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Create bootable ISO from macOS Catalina Installer
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| # https://support.apple.com/en-us/HT201372 | |
| # download macOS Catalina | |
| # https://itunes.apple.com/us/app/macos-catalina/id1466841314?ls=1&mt=12 | |
| # create blank image and put in /tmp directory | |
| hdiutil create -o /tmp/Catalina.cdr -size 7000m -layout SPUD -fs HFS+J | |
| # mount blank image at install_build | |
| hdiutil attach /tmp/Catalina.cdr.dmg -noverify -mountpoint /Volumes/install_build | |
| # run the createinstallmedia on the target /Volumes/install_build | |
| sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/install_build | |
| # move populated image to Desktop and name it InstallSystem.dmg | |
| mv /tmp/Catalina.cdr.dmg ~/Desktop/InstallSystem.dmg | |
| # unmount Catalina install | |
| hdiutil detach /Volumes/Install\ macOS\ Catalina | |
| # convert dmg to iso | |
| hdiutil convert ~/Desktop/InstallSystem.dmg -format UDTO -o ~/Desktop/Catalina.iso |
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