SIP enabled NetBoot environment blocking pkg installation

[poundbangbash]

This issue circles around the FirmwareUpdate.pkg that needs to be applied for Macs to boot APFS drives.

When that package (re-generated to add exit 0 to the postinstall script) attempts to install in an AutoImagrNBI booted environment the installation fails stating folders can't be moved and I/O errors.

Using AutoNBI following the instructions at https://github.com/grahamgilbert/imagr/wiki/Manual-Creation results in a NetInstall environment that does not have SIP enabled. The same FirmwareUpdate.pkg installs via the same Imagr workflow (and fails or installs gracefully) without error.

It appears SIP will need to be disabled on the NetBoot environment if possible to allow the installation of the Firmware package to proceed.

[macmule]

Creating non-SIP'd NetBoot Images is something I have tested but not got working, with the death of NetBoot I'm going to leave this one here.. it's a "wontfix" from me for now.. but maybe someone can PR?

[macmule]

Also.. the NBI's created are HFS, so this might need some APFS conversion too...