Samba client - no attempt to mount

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1

I’m trying to mount a samba share, as described here, but I can’t find any evidence that NixOS is even attempting to mount the share.

I’m building and running a VM with these commands, the flake.nix and configuration.nix are below:

$ nix build \
    .#nixosConfigurations.test.config.system.build.vm \
    --extra-experimental-features "nix-command flakes pipe-operators" \
    --impure
$ ./result/bin/run-nixos-vm
$ ssh admin@localhost -p 2222 # password is "password"

When I build and run, I can’t see anything:

  1. From systemctl list-units | grep buffalo (or grepping for e.g. media)

  2. From journalctl -b | grep buffalo (and grepping for cifs shows the kernel inserted the cifs module, at least)

  3. Anything in /etc/fstab (thought these were supposed to be done as systemd services but thought I should check just in case!)

I’m pretty new to NixOS so I’m aware I maybe doing something silly but I can’t find why the below isn’t getting through to the image on the VM, any help is very much appreciated!

# flake.nix
{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
  };

  outputs = { self, nixpkgs, home-manager, ... }@attrs:
    let
      system = "x86_64-linux";
    in
    {
      # test is a hostname for our machine
      nixosConfigurations.test = nixpkgs.lib.nixosSystem {
        inherit system;
        modules = [
          "${nixpkgs}/nixos/modules/virtualisation/qemu-vm.nix"
          home-manager.nixosModules.home-manager
          ./configuration.nix
        ];
      };
    };
}


# configuration.nix
{ lib, config, pkgs, ... }:

{
  system.stateVersion = "26.05";


  #
  # Things I think I need to get Samba to work.
  #

  # Basic packages available inside VM
  environment.systemPackages = [
    pkgs.cifs-utils
    pkgs.samba
  ];

  systemd.tmpfiles.rules = [
    "d /media/buffalo 0777 root root -"
  ];

  fileSystems = {
    "/media/buffalo" = {
      device = "//123.45.2.1/buffalo";
      fsType = "cifs";
      # TODO: credentials=/etc/buffalo.TODO,
      #options = ["rw,vers=2.0,file_mode=0777,dir_mode=0777"];
      options = [
        "rw"
        "vers=2.0"
        #"credentials=/etc/buffalo.credentials" # Or whatever you name the file
        "file_mode=0777"
        "dir_mode=0777"
        "_netdev" # CRITICAL: Wait for network
        "nofail"  # CRITICAL: Don't block boot
        "guest"
      ];
    };
  };


  #
  # Extra config so you can `ssh admin@localhost -p 2222` (password
  # "password") to a sudo-capable user.
  #

  virtualisation.forwardPorts = [
    { from = "host"; host.port = 2222; guest.port = 22; }
  ];

  # Allow passwordless sudo (optional)
  security.sudo = {
    enable = true;
    wheelNeedsPassword = false;
  };

  # Graphics in the VM (optional)
  virtualisation.graphics = true;

  services.openssh.enable = true;

  # Optional but recommended:
  services.openssh.settings = {
    PermitRootLogin = "no";
    PasswordAuthentication = true;
    KbdInteractiveAuthentication = false;
  };

  boot.kernelModules = [ "cifs" ];
  boot.supportedFilesystems = [ "cifs" ];


  users.users = {
    admin = {
      isNormalUser = true;
      password = "password";
      extraGroups = [ "wheel" ];
    };
  };
}