Create or update macOS Mojave Recovery Partition Without Reinstalling

recovery.sh

#!/bin/sh

# Set the macOS installer path as a variable
MACOS_INSTALLER="/Applications/$(ls /Applications | grep "Install macOS")"
MOUNT_POINT="$MACOS_INSTALLER/Contents/SharedSupport"
echo "macOS installer is \"$MACOS_INSTALLER\""

# Set the target disk as a variable
TARGET=$(diskutil info "$(bless --info --getBoot)" | awk -F':' '/Volume Name/ { print $2 }' | sed -e 's/^[[:space:]]*//')
echo "Target disk is \"$TARGET\""

# Set the target disk filesystem
FS_TYPE=$(diskutil info "$TARGET" | awk '$1 == "Type" { print $NF }')
echo "Target filesystem is \"${FS_TYPE}\""

# Download the APFS-compatible Recovery into /private/tmp (use 10.13.6, which also works with Mojave 10.14.x)
echo "Downloading macOSUpd10.13.6.RecoveryHDUpdate.pkg into /private/tmp"
curl http://swcdn.apple.com/content/downloads/42/58/091-94330/mm8vnigq4ulozt9iqhgcl9hp8m7iygsqbl/macOSUpd10.13.6.RecoveryHDUpdate.pkg --progress-bar -L -o /private/tmp/macOSUpd10.13.6.RecoveryHDUpdate.pkg
pkgutil --expand /private/tmp/macOSUpd10.13.6.RecoveryHDUpdate.pkg /private/tmp/recoveryupdate10.13.6

if [[ "${FS_TYPE}" == "apfs" ]]; then
	echo "Running ensureRecoveryBooter for APFS target volume: $TARGET"
	/private/tmp/recoveryupdate10.13.6/Scripts/Tools/dm ensureRecoveryBooter "$TARGET" -base "$MOUNT_POINT/BaseSystem.dmg" "$MOUNT_POINT/BaseSystem.chunklist" -diag "$MOUNT_POINT/AppleDiagnostics.dmg" "$MOUNT_POINT/AppleDiagnostics.chunklist" -diagmachineblacklist 0 -installbootfromtarget 0 -slurpappleboot 0 -delappleboot 0 -addkernelcoredump 0
else
	echo "Running ensureRecoveryPartition for Non-APFS target volume: $TARGET"
	/private/tmp/recoveryupdate10.13.6/Scripts/Tools/dm ensureRecoveryPartition "$TARGET" "$MOUNT_POINT/BaseSystem.dmg" "$MOUNT_POINT/BaseSystem.chunklist" "$MOUNT_POINT/AppleDiagnostics.dmg" "$MOUNT_POINT/AppleDiagnostics.chunklist" 0 0 0
fi

echo "Finished creating Recovery HD"

Thanks for sharing this! Had no issues with it..

At what point is it expected that this script is running? i.e. when does a system have the OS installer still available in /Applications ?

Same problem as @StevenKSanford.

@StevenKSanford @gustavolessa23 you can copy dm util from 10.13.6 pkg and use it on mojave

I assume this one is not going to work for Mojave 10.14.4?

About to give this a shot.

How did it go? Did it work for 10.14.5? I updated my MacPro trash-can hard drive, and i had to clone the new harddrive and i want to update the recovery partition. I'll try this myself and fork the script if it works.

How did it go? Did it work for 10.14.5? I updated my MacPro trash-can hard drive, and i had to clone the new harddrive and i want to update the recovery partition. I'll try this myself and fork the script if it works.

Not working for me. I'm on 10.14.5 too, after a taste of Catalina. I can't enter recovery mode since the downgrade. \sad

Thanks for sharing this script. Because it references a 10.13.6 version of a Recovery HD file, I assumed it would install a 10.13.6 High Sierra recovery partition. I was surprised to discover that it actually uses whatever version of “Install macOS” .app is in your Applications folder. So in my case, my Mac Pro is running High Sierra, but I only had Install macOS Mojave.app in my Applications folder, so after running this script I ended up with a Mojave recovery partition.

If anyone else is looking specifically for a High Sierra recovery partition, and you can’t see Install macOS High Sierra in the App Store anymore, a direct link to High Sierra in the App Store is still available on this page: https://support.apple.com/en-us/HT208969 . In my case this App Store link only downloaded a small 22MB “stub” High Sierra installer which didn’t include the resources this script depends on. I gave up at that point and just used the stub installer to reinstall High Sierra and the recovery partition at the same time.

Also to note, on APFS disks the recovery partition no longer shows up in the boot menu on a Mac Pro 5,1 when you hold down the Option key while booting. APFS recovery partitions are a hidden volume within the disk’s APFS container, which isn’t listed in the boot menu like recovery partitions on HFS+ drives are. At least that’s true for my new NVMe drive. Nonetheless, booting into the recovery partition with Command+R worked great.

Awesome, after some try, and figure out that i haven't the installer in /Applications, this works well :)

For better understanding, you should make some errors echo. Like "You don't got any installer". "You don't have internet connexion". ;)

Thanks for you job !