Simplify flake and expose host pkgs

The configuration of the machines is now moved to m/

m/common/main.nix

@@ -0,0 +1,87 @@
+{ config, pkgs, nixpkgs, bscpkgs, agenix, theFlake, ... }:
+
+{
+  imports = [
+    ./boot.nix
+    ./fs.nix
+    ./hw.nix
+    ./net.nix
+    ./slurm.nix
+    ./ssh.nix
+    ./users.nix
+  ];
+
+  nixpkgs.overlays = [ bscpkgs.bscOverlay ];
+
+  nix.nixPath = [
+    "nixpkgs=${nixpkgs}"
+    "bscpkgs=${bscpkgs}"
+    "jungle=${theFlake.outPath}"
+  ];
+
+  nix.registry.nixpkgs.flake = nixpkgs;
+  nix.registry.bscpkgs.flake = bscpkgs;
+  nix.registry.jungle.flake = theFlake;
+
+  system.configurationRevision =
+    if theFlake ? rev
+    then theFlake.rev
+    else throw ("Refusing to build from a dirty Git tree!");
+
+  environment.systemPackages = with pkgs; [
+    vim wget git htop tmux pciutils tcpdump ripgrep nix-index nixos-option
+    nix-diff ipmitool freeipmi ethtool lm_sensors ix cmake gnumake file tree
+    ncdu
+  ];
+
+  systemd.services."serial-getty@ttyS0" = {
+    enable = true;
+    wantedBy = [ "getty.target" ];
+    serviceConfig.Restart = "always";
+  };
+
+  # Increase limits
+  security.pam.loginLimits = [
+    {
+      domain = "*";
+      type = "-";
+      item = "memlock";
+      value = "1048576"; # 1 GiB of mem locked
+    }
+  ];
+
+  time.timeZone = "Europe/Madrid";
+  i18n.defaultLocale = "en_DK.UTF-8";
+
+  environment.variables = {
+    EDITOR = "vim";
+    VISUAL = "vim";
+  };
+
+  nix.settings.experimental-features = [ "nix-command" "flakes" ];
+  nix.settings.sandbox = "relaxed";
+  nix.settings.trusted-users = [ "@wheel" ];
+  nix.gc.automatic = true;
+  nix.gc.dates = "weekly";
+  nix.gc.options = "--delete-older-than 30d";
+
+  programs.zsh.enable = true;
+  programs.zsh.histSize = 100000;
+
+  programs.bash.promptInit = ''
+    PS1="\h\\$ "
+  '';
+
+  # Copy the NixOS configuration file and link it from the resulting system
+  # (/run/current-system/configuration.nix). This is useful in case you
+  # accidentally delete configuration.nix.
+  #system.copySystemConfiguration = true;
+
+  # This value determines the NixOS release from which the default
+  # settings for stateful data, like file locations and database versions
+  # on your system were taken. It‘s perfectly fine and recommended to leave
+  # this value at the release version of the first install of this system.
+  # Before changing this value read the documentation for this option
+  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
+  system.stateVersion = "22.11"; # Did you read the comment?
+}