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Scripts of possible interest to macOS admins
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docs
.gitignore
LICENSE.md
README.md
createbootvolfromautonbi.py
installinstallmacos.py
make_firmwareupdater_pkg.sh

README.md

macadmin-scripts

Some scripts that might be of use to macOS admins. Might be related to Munki; might not.

createbootvolfromautonbi.py

A tool to make bootable disk volumes from the output of autonbi. Especially useful to make bootable disks containing Imagr and the 'SIP-ignoring' kernel, which allows Imagr to run scripts that affect SIP state, set UAKEL options, and run the startosinstall component, all of which might otherwise require network booting from a NetInstall-style nbi.

This provides a way to create a bootable external disk that acts like the Netboot environment used by/needed by Imagr.

This command converts the output of Imagr's make nbi into a bootable external USB disk: sudo ./createbootvolfromautonbi.py --nbi ~/Desktop/10.13.6_Imagr.nbi --volume /Volumes/ExternalDisk

installinstallmacos.py

This script can create disk images containing macOS Installer applications available via Apple's softwareupdate catalogs.

Run ./installinstallmacos.py --help to see the available options.

The tool assembles "Install macOS" applications by downloading the packages from Apple's softwareupdate servers and then installing them into a new empty disk image.

If /usr/bin/installer returns errors during this process, it can be useful to examine /var/log/install.log for clues.

Since it is using Apple's installer, any install check or volume check scripts are run. This means that you can only use this tool to create a diskimage containing the versions of macOS that will run on the exact machine you are running the script on.

For example, to create a diskimage containing the version 10.13.6 that runs on 2018 MacBook Pros, you must run this script on a 2018 MacBook Pro, and choose the proper version.

Typically "forked" OS build numbers are 4 digits, so when this document was last updated, build 17G2208 was the correct build for 2018 MacBook Pros; 17G65 was the correct build for all other Macs that support High Sierra.

If you attempt to install an incompatible version of macOS, you'll see an error similar to the following:

Making empty sparseimage...
installer: Error - ERROR_B14B14D9B7
Command '['/usr/sbin/installer', '-pkg', './content/downloads/07/20/091-95774/awldiototubemmsbocipx0ic9lj2kcu0pt/091-95774.English.dist', '-target', '/private/tmp/dmg.Hf0PHy']' returned non-zero exit status 1
Product installation failed.

Use a compatible Mac or select a different build compatible with your current hardware and try again. You may also have success running the script in a VM; the InstallationCheck script in versions of the macOS installer to date skips the checks (and returns success) when run on a VM.

make_firmwareupdater_pkg.sh

This script was used to extract the firmware updaters from early High Sierra installers and make a standalone installer package that could be used to upgrade Mac firmware before installing High Sierra via imaging.

Later High Sierra installer changes have broken this script; since installing High Sierra via imaging is not recommended or supported by Apple and several other alternatives are now available, I don't plan on attempting to fix or upgrade this tool.

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