`systemctl kexec` stopped working

[arianvp]

Describe the bug

Seems systemd added extra checks to systemctl that make it fail before our custom prepare-kexec.service runs.

Oct 02 16:35:28 ip-10-0-2-111.ec2.internal systemctl[2974]: No kexec kernel loaded and autodetection failed.
Oct 02 16:35:28 ip-10-0-2-111.ec2.internal systemctl[2974]: Automatic loading works only on systems booted with EFI.
Oct 02 16:35:28 ip-10-0-2-111.ec2.internal systemd[1]: deploy-user-data.service: Main process exited, code=exited, status=1/FAILURE
Oct 02 16:35:28 ip-10-0-2-111.ec2.internal systemd[1]: deploy-user-data.service: Failed with result 'exit-code'.
Oct 02 16:35:28 ip-10-0-2-111.ec2.internal systemd[1]: Failed to start deploy-user-data.service.

Steps To Reproduce

nixos-rebuild boot && systemctl kexec

Expected behavior

https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/system/boot/kexec.nix gets pulled in and then kexec happens.

Screenshots

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Additional context

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Notify maintainers

Metadata

Please run nix-shell -p nix-info --run "nix-info -m" and paste the result.

[user@system:~]$ nix-shell -p nix-info --run "nix-info -m"
output here

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[arianvp]

systemctl start kexec.target does still work as expected. Perhaps we should just update the docs.

Problem is that systemctl kexec checks if a kernel and bails out if there isn't any.

It didnt use to do that. And that would mean prepare-kexec.service would get pulled in just in time to load the kernel