/boot partition not mounted

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1

I prepared a boot partition and a root partition on a new drive, and installed NixOS from another running NixOS using nixos-install --root /mnt. It boots fine but running e.g. nixos-rebuild results in errors about missing boot partition

➜  ~ sudo nixos-rebuild switch 
building Nix...
building the system configuration...
this derivation will be built:
  /nix/store/fi0z5rs7njgrx1l6hzmji6jdsryf1ng0-nixos-system-leon-nixos-24.05.4169.797f7dc49e0b.drv
building '/nix/store/fi0z5rs7njgrx1l6hzmji6jdsryf1ng0-nixos-system-leon-nixos-24.05.4169.797f7dc49e0b.drv'...
efiSysMountPoint = '/boot' is not a mounted partition. Is the path configured correctly?
Traceback (most recent call last):
  File "/nix/store/lpr9a49mfalfir0za242x57377n2yfzq-17nyliyy0k59a6ky037y6fj902f1s2w5-systemd-boot", line 397, in <module>
    main()
  File "/nix/store/lpr9a49mfalfir0za242x57377n2yfzq-17nyliyy0k59a6ky037y6fj902f1s2w5-systemd-boot", line 377, in main
    subprocess.check_call(CHECK_MOUNTPOINTS)
  File "/nix/store/3wb0055984n2whn449hywsl4ag9gcjir-python3-3.11.9/lib/python3.11/subprocess.py", line 413, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '/nix/store/za0y24r2l67222kyz8hi2nzi9qpavmav-check-mountpoints' returned non-zero exit status 1.
warning: error(s) occurred while switching to the new configuration

Indeed the partition is not mounted. When I run sudo mount /dev/disk/by/uuid/<uuid> /boot, above command succeeds. Why does this happen? This is my hardware-configuration:

{ config, lib, pkgs, modulesPath, ... }:
{
  imports =
    [ (modulesPath + "/installer/scan/not-detected.nix")
    ];

  boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "thunderbolt" "uas" "sd_mod" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-amd" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" =
    { device = "/dev/disk/by-uuid/38e72c62-f8b8-40ac-8586-d16d172b1854";
      fsType = "ext4";
    };
  
  swapDevices = [];

  networking.useDHCP = lib.mkDefault true;
  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
  hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
}
2

Well, your hardware-configuration.nix doesn’t contain a fileSystems."/boot" entry. You must have run nixos-generate-config before you had mounted it. You can just mount it, run nixos-generate-config again (it will only regenerate hardware-configuration.nix), and rebuild.

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