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interstateone/macOS-big-sur-iso.sh

Forked from jamieparfet/macOS-mojave-iso.sh
Last active June 23, 2020 03:41
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Create an ISO from the mojave installer app
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macOS-big-sur-iso.sh
#!/bin/bash
# This assumes that the ~10GB Big Sur installer is in the /Applications folder.
hdiutil create -o /tmp/bigsur.cdr -size 10g -layout SPUD -fs HFS+J
hdiutil attach /tmp/bigsur.cdr.dmg -noverify -mountpoint /Volumes/InstallBigSur
# You need to manually erase the new volume in Disk Utility otherwise the next command will fail
# The use of /Volumes/untitled is deliberate, because that's what its name will be after the preceding commands
# Not sure why that is
sudo /Applications/Install\ macOS\ Beta.app/Contents/Resources/createinstallmedia --volume /Volumes/untitled
mv /tmp/bigsur.cdr.dmg ~/Desktop/InstallSystem.dmg
hdiutil detach /Volumes/Install\ macOS\ Beta
hdiutil convert ~/Desktop/InstallSystem.dmg -format UDTO -o ~/Desktop/bigsur.iso
mv ~/Desktop/bigsur.iso.cdr ~/Desktop/bigsur.iso
rm ~/Desktop/InstallSystem.dmg
# Now there should be an ISO on your desktop called bigsur.iso
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