macos_iso.txt

Make a MacOS .iso from an installer
from https://www.geekrar.com/create-macos-catalina-iso-file/

Catalina example

Create a DMG Disk Image
hdiutil create -o /tmp/Catalina -size 8500m -volname Catalina -layout SPUD -fs HFS+J

Mount it to your macOS
hdiutil attach /tmp/Catalina.dmg -noverify -mountpoint /Volumes/Catalina

Create macOS Catalina Installer
sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia --volume /Volumes/Catalina --nointeraction

Unmount Catalina Disk
hdiutil detach /volumes/Install\ macOS\ Catalina

Convert the DMG file to an ISO file
hdiutil convert /tmp/Catalina.dmg -format UDTO -o ~/Desktop/Catalina.cdr

Rename to iso
mv ~/Desktop/Catalina.cdr ~/Desktop/Catalina.iso