refactor: change file structure to use modules dir

This commit changes the file structure around, so that we have the
following parts:

`/modules` contains reusable logic blocks for hosts.
`/hosts` contains host configurations.
`/lib` contains nix library functions.
`/overlays` contains overlay files.
`/public-keys` contains all information regarding public keys.

This change reduces the complexity of flake.nix, instead delegating this
out to the `default.nix` files in the above directories.

flake.nix

@@ -37,6 +37,8 @@
         ./public-keys
         ./lib
         ./overlays
+        ./modules
+        ./hosts
       ];
 
       perSystem = { system, pkgs, config, ... }: {
@@ -73,88 +75,11 @@
       flake =
         let
           username = "barkeeper";
-          system = "x86_64-linux";
         in {
-          nixosConfigurations = {
+          inherit username;
-            nachtigall = self.nixos-flake.lib.mkLinuxSystem {
-              imports = [
-                self.nixosModules.common
-                ./hosts/nachtigall
-                self.pub-solar.lib.linux.unlockZFSOnBoot
-                self.nixosModules.home-manager
-                self.nixosModules.linux
-                self.nixosModules.overlays
-                inputs.agenix.nixosModules.default
-                {
-                  home-manager.users.${username} = {
-                    imports = [
-                      self.homeModules.common
-                    ];
-                    home.stateVersion = "23.05";
-                  };
-                }
-              ];
-            };
-          };
 
           checks = builtins.mapAttrs (system: deployLib: deployLib.deployChecks self.deploy) inputs.deploy-rs.lib;
 
-          nixosModules = {
-            # Common nixos/nix-darwin configuration shared between Linux and macOS.
-            common = { pkgs, ... }: {
-              virtualisation.docker = {
-                enable = true;
-                extraOptions = ''
-                  --data-root /var/lib/docker
-                '';
-                storageDriver = "zfs";
-              };
-
-              services.openssh.enable = true;
-              services.openssh.settings.PermitRootLogin = "prohibit-password";
-              services.openssh.settings.PasswordAuthentication = false;
-            };
-
-            # NixOS specific configuration
-            linux = { pkgs, ... }: {
-              users.users.${username} = {
-                name = username;
-                group = username;
-                extraGroups = ["wheel"];
-                isNormalUser = true;
-                openssh.authorizedKeys.keys = self.publicKeys.allAdmins;
-              };
-              users.groups.${username} = {};
-
-              security.sudo.wheelNeedsPassword = false;
-              nix.settings.trusted-users = [ "root" username ];
-
-              # TODO: Remove when we stop locking ourselves out.
-              users.users.root.openssh.authorizedKeys.keys = self.publicKeys.allAdmins;
-            };
-          };
-
-          # All home-manager configurations are kept here.
-          homeModules = {
-            # Common home-manager configuration shared between Linux and macOS.
-            common = { pkgs, ... }: {
-              programs.git.enable = true;
-              programs.starship.enable = true;
-              programs.bash.enable = true;
-              programs.neovim = {
-                enable = true;
-                vimAlias = true;
-                viAlias = true;
-                defaultEditor = true;
-                # configure = {
-                #   packages.myVimPackages = with pkgs.vimPlugins; {
-                #     start = [vim-nix vim-surrund rainbow];
-                #   };
-                # };
-              };
-            };
-          };
-
           deploy.nodes = self.pub-solar.lib.deploy.mkDeployNodes self.nixosConfigurations {
             nachtigall = {
               sshUser = username;

hosts/default.nix

@@ -0,0 +1,18 @@
+  { self, ... }:
+  {
+    flake = {
+      nixosConfigurations = {
+        nachtigall = self.nixos-flake.lib.mkLinuxSystem {
+          imports = [
+            self.inputs.agenix.nixosModules.default
+            self.nixosModules.home-manager
+            ./nachtigall
+            self.nixosModules.overlays
+            self.nixosModules.unlock-zfs-on-boot
+            self.nixosModules.core
+            self.nixosModules.docker
+          ];
+        };
+      };
+    };
+  }

hosts/nachtigall/configuration.nix

@@ -1,4 +1,4 @@
-{ config, pkgs, ... }:
+{ config, pkgs, flake, ... }:
 {
   # Use GRUB2 as the boot loader.
   # We don't use systemd-boot because Hetzner uses BIOS legacy boot.
@@ -39,32 +39,9 @@
     systemPackages = with pkgs; [ vim ];
   };
 
-  users.users.hakkonaut = {
-    description = "CI and automation user";
-    home = "/home/hakkonaut";
-    createHome = true;
-    useDefaultShell = true;
-    uid = 998;
-    group = "hakkonaut";
-    isSystemUser = true;
-    openssh.authorizedKeys.keys = [
-      "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGP5MvCwNRtCcP1pSDrn0XZTNlpOqYnjHDm9/OI4hECW hakkonaut@flora-6"
-    ];
-  };
-
   # https://nixos.wiki/wiki/ZFS#declarative_mounting_of_ZFS_datasets
   systemd.services.zfs-mount.enable = false;
 
-  users.groups.hakkonaut = {};
-
-  users.users.root.initialHashedPassword = "$y$j9T$bIN6GjQkmPMllOcQsq52K0$q0Z5B5.KW/uxXK9fItB8H6HO79RYAcI/ZZdB0Djke32";
-  age.secrets."nachtigall-root-ssh-key" = {
-    file = "${flake.self}/secrets/nachtigall-root-ssh-key.age";
-    path = "/root/.ssh/id_ed25519";
-    mode = "400";
-    owner = root;
-  };
-
   # This value determines the NixOS release with which your system is to be
   # compatible, in order to avoid breaking some software such as database
   # servers. You should change this only after NixOS release notes say you

hosts/nachtigall/default.nix

@@ -7,7 +7,6 @@
       ./configuration.nix
 
       ./networking.nix
-      ./nix.nix
       ./apps/nginx.nix
 
       ./apps/collabora.nix

hosts/nachtigall/networking.nix

@@ -21,14 +21,4 @@
   ];
   networking.defaultGateway = "138.201.80.65";
   networking.defaultGateway6 = { address = "fe80::1"; interface = "enp35s0"; };
-
-  services.resolved = {
-    enable = true;
-    extraConfig = ''
-      DNS=193.110.81.0#dns0.eu 185.253.5.0#dns0.eu 2a0f:fc80::#dns0.eu 2a0f:fc81::#dns0.eu 9.9.9.9#dns.quad9.net 149.112.112.112#dns.quad9.net 2620:fe::fe#dns.quad9.net 2620:fe::9#dns.quad9.net
-      FallbackDNS=5.1.66.255#dot.ffmuc.net 185.150.99.255#dot.ffmuc.net 2001:678:e68:f000::#dot.ffmuc.net 2001:678:ed0:f000::#dot.ffmuc.net
-      Domains=~.
-      DNSOverTLS=yes
-    '';
-  };
 }

lib/default.nix

@@ -11,10 +11,6 @@
       ## In configs, they can be used under "lib.our"
 
       deploy = import ./deploy.nix { inherit inputs lib; };
-
-      linux = {
-        unlockZFSOnBoot = import ./unlock-zfs-on-boot.nix {publicKeys = self.publicKeys.allAdmins;};
-      };
     };
   };
 }

modules/default.nix

@@ -0,0 +1,26 @@
+{ self, ... }:
+{
+  flake = {
+    nixosModules = rec {
+      nix = import ./nix.nix;
+      networking = import ./networking.nix;
+      unlock-zfs-on-boot = import ./unlock-zfs-on-boot.nix;
+      docker = import ./docker.nix;
+      terminal-tooling = import ./terminal-tooling.nix;
+      users = import ./users.nix;
+
+      core = {
+        imports = [
+          nix
+          networking
+          terminal-tooling
+          users
+        ];
+
+        home-manager.users.${self.username} = {
+          home.stateVersion = "23.05";
+        };
+      };
+    };
+  };
+}

modules/docker.nix

@@ -0,0 +1,9 @@
+{ pkgs, ... }: {
+  virtualisation.docker = {
+    enable = true;
+    extraOptions = ''
+      --data-root /var/lib/docker
+    '';
+    storageDriver = "zfs";
+  };
+}

modules/networking.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }: {
+  services.openssh.enable = true;
+  services.openssh.settings.PermitRootLogin = "prohibit-password";
+  services.openssh.settings.PasswordAuthentication = false;
+
+  services.resolved = {
+    enable = true;
+    extraConfig = ''
+      DNS=193.110.81.0#dns0.eu 185.253.5.0#dns0.eu 2a0f:fc80::#dns0.eu 2a0f:fc81::#dns0.eu 9.9.9.9#dns.quad9.net 149.112.112.112#dns.quad9.net 2620:fe::fe#dns.quad9.net 2620:fe::9#dns.quad9.net
+      FallbackDNS=5.1.66.255#dot.ffmuc.net 185.150.99.255#dot.ffmuc.net 2001:678:e68:f000::#dot.ffmuc.net 2001:678:ed0:f000::#dot.ffmuc.net
+      Domains=~.
+      DNSOverTLS=yes
+    '';
+  };
+}

modules/nix.nix

@@ -36,7 +36,7 @@
 
     nixPath = [
       "nixpkgs=${flake.inputs.nixpkgs}"
-      "nixos-config=${../../lib/compat/nixos}"
+      "nixos-config=${../lib/compat/nixos}"
       "home-manager=${flake.inputs.home-manager}"
     ];
   };

modules/terminal-tooling.nix

@@ -0,0 +1,18 @@
+{ flake, ... }: {
+  home-manager.users.${flake.self.username} = {
+    programs.git.enable = true;
+    programs.starship.enable = true;
+    programs.bash.enable = true;
+    programs.neovim = {
+      enable = true;
+      vimAlias = true;
+      viAlias = true;
+      defaultEditor = true;
+      # configure = {
+      #   packages.myVimPackages = with pkgs.vimPlugins; {
+      #     start = [vim-nix vim-surrund rainbow];
+      #   };
+      # };
+    };
+  };
+}

modules/unlock-zfs-on-boot.nix

@@ -1,4 +1,4 @@
-{publicKeys}: {
+{ flake, ... }: {
   # From https://nixos.wiki/wiki/ZFS#Unlock_encrypted_zfs_via_ssh_on_boot
   boot.initrd.network = {
     enable = true;
@@ -10,7 +10,7 @@
 
       # Please create this manually the first time.
       hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
-      authorizedKeys = publicKeys;
+      authorizedKeys = flake.self.publicKeys.admins;
     };
     # this will automatically load the zfs password prompt on login
     # and kill the other prompt so boot can continue

modules/users.nix

@@ -0,0 +1,36 @@
+{ flake, pkgs, ... }: {
+  users.users.${flake.self.username} = {
+    name = flake.self.username;
+    group = flake.self.username;
+    extraGroups = ["wheel"];
+    isNormalUser = true;
+    openssh.authorizedKeys.keys = flake.self.publicKeys.admins;
+  };
+  users.groups.${flake.self.username} = {};
+
+  # TODO: Remove when we stop locking ourselves out.
+  users.users.root.openssh.authorizedKeys.keys = flake.self.publicKeys.admins;
+
+  users.users.hakkonaut = {
+    description = "CI and automation user";
+    home = "/home/hakkonaut";
+    createHome = true;
+    useDefaultShell = true;
+    uid = 998;
+    group = "hakkonaut";
+    isSystemUser = true;
+    openssh.authorizedKeys.keys = flake.self.publicKeys.robots;
+  };
+
+  users.groups.hakkonaut = {};
+
+  users.users.root.initialHashedPassword = "$y$j9T$bIN6GjQkmPMllOcQsq52K0$q0Z5B5.KW/uxXK9fItB8H6HO79RYAcI/ZZdB0Djke32";
+  age.secrets."nachtigall-root-ssh-key" = {
+    file = "${flake.self}/secrets/nachtigall-root-ssh-key.age";
+    path = "/root/.ssh/id_ed25519";
+    mode = "400";
+    owner = root;
+  };
+
+  security.sudo.wheelNeedsPassword = false;
+}

public-keys/default.nix

@@ -2,7 +2,8 @@
 {
   flake = {
     publicKeys = {
-      allAdmins = lib.attrsets.attrValues (import ./admins.nix); 
+      admins = lib.attrsets.attrValues (import ./admins.nix); 
+      robots = lib.attrsets.attrValues (import ./robots.nix);
     };
   };
 }

public-keys/robots.nix

@@ -0,0 +1,7 @@
+{
+  # Used for restic backups to droppie, a server run by @b12f
+  "root@droppie" = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBZQSephFJU0NMbVbhwvVJ2/m6jcPYo1IsWCsoarqKin root@droppie";
+
+  # robot user on flora-6
+  "hakkonaut@flora-6" = "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIGP5MvCwNRtCcP1pSDrn0XZTNlpOqYnjHDm9/OI4hECW hakkonaut@flora-6";
+}

secrets/restic-password-droppie.age

@@ -0,0 +1,29 @@
+age-encryption.org/v1
+-> ssh-ed25519 iDKjwg tSrbeVPpTxjeuCg6JiOdeIcaGWq/PUOyXrt+ZNIWmzI
+fz4B2nMu36G1DYPyNiu30Txx4cOLGyUreuBLqktORhY
+-> ssh-ed25519 uYcDNw zySKp8qUnCKOCbIP17bWYvJ/TsKxLl/v/AEsfVQpHTc
+SYqaUEXJ7mSA2wY6I3i/hirEiqvXVnWH1NYtXbaMzbw
+-> ssh-rsa kFDS0A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+-> ssh-ed25519 YFSOsg vJ7xw4zDSKBFuv8FT6ZnB83uGwHDnDsEwsvQ6urZkEk
+gOkuwjOX8U/qmPuGrPPb+FYy6PuJjrgCNFYrukkaIPA
+-> ssh-ed25519 iHV63A FzZRHQB39iDTLm4y1QLWtfDi3jZn6i59nuSlf0d5mww
+5kiyKN7KFTv8pJgRAZTUMgR2+TInByFotDhAw307P6g
+-> ssh-ed25519 BVsyTA rTjBaEI6AwwmpK9Q8elVJaSN60deXOMEmZPrsH9O1nY
+HikNbHzx3BEJ3hn4YPFr2p/cnSu3qr9cvgdKCxN6xY8
+-> h|2u%UF\-grease Gcp2NG
+y6OjgzrOYEVgrY2+fv8a1xrVuoHQIPncGuGeLI0zHh4xf1qbzD2vKYp+W1fRBE8d
+/yPEGUe/T/ZjO+F4oF266HUR23wancFeFoGpfJgWQVS2oc0Z4aMuNebf/+Kw087W
+
+--- GJBLNxBoH7vI1mkcCmfbm9UiG4xuwIOWS7IaJKuO6cc
+C<EFBFBD>3=¼,¦{-TçÄéȵ	™-ˆ]äÌ·»æq=‡“û
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