canonical / nullboot / 20937570516

Pull #144

github

feat: Systemd one-shot service for Kernel fallback mechanism

Adds a systemd one-shot service to amend the bootloader on a successfully
booted, new kernel entry using the -confirm-kernel-boot option.

Should a newly installed kernel panic while booting, no changes will
occur in the boot loader.

In the event that a new kernel successfully boots, nullboot will amend
the boot loader such that BootCurrent == BootOrder[0].

However, if the current boot is not the latest kernel, nullboot will
exit with an error, but (importantly) not modify any boot variables.

In a standard reboot scenario, nullboot will run with the default
nullboot behavior, which ideally does nothing unless the user manually
modifies the EFI variables.

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