feat(meta/*): support generalized deployments

Our colmena knows how to deal with families of system types, e.g. NixOS
systems or Liminix-based systems.

This is a step 1 towards supporting our APs in our infrastructure.

Signed-off-by: Ryan Lahfa <ryan@dgnum.eu>

default.nix

@@ -37,7 +37,6 @@
 {
   sources ? import ./npins,
   pkgs ? import sources.nixpkgs { },
-  nix-pkgs ? import sources.nix-pkgs { inherit pkgs; },
 }:
 
 let
@@ -112,7 +111,9 @@ in
       }))
       pkgs.npins
 
-      (pkgs.callPackage ./lib/colmena { inherit (nix-pkgs) colmena; })
+      (pkgs.callPackage ./lib/colmena {
+        colmena = pkgs.callPackage "${sources.colmena}/package.nix" { };
+      })
       (pkgs.callPackage "${sources.agenix}/pkgs/agenix.nix" { })
       (pkgs.callPackage "${sources.lon}/nix/packages/lon.nix" { })
     ] ++ (builtins.attrValues scripts);

hive.nix

@@ -6,6 +6,7 @@ let
     .applyPatches' sources';
 
   nix-lib = import ./lib/nix-lib;
+  inherit (nix-lib) warn;
 
   patch = import ./lib/nix-patches { patchFile = ./patches; };
 
@@ -15,15 +16,23 @@ let
   mkNode = node: {
     # Import the base configuration for each node
     imports = [ ./machines/${node}/_configuration.nix ];
+
+    deployment.systemType = "nixos";
   };
 
   nixpkgs' = import ./meta/nixpkgs.nix;
-  # All supported nixpkgs versions, instanciated
-  nixpkgs = nix-lib.mapSingleFuse mkNixpkgs nixpkgs'.supported;
+  # All supported nixpkgs versions × systems, instanciated
+  nixpkgs = nix-lib.mapSingleFuse (
+    s: nix-lib.mapSingleFuse (mkSystemNixpkgs s) nixpkgs'.versions.supported
+  ) nixpkgs'.systems.supported;
 
   # Get the configured nixos version for the node,
   # defaulting to the one defined in meta/nixpkgs
-  version = node: nodes'.${node}.nixpkgs or nixpkgs'.default;
+  version = node: nodes'.${node}.nixpkgs.version or nixpkgs'.versions.default;
+  systemType =
+    node:
+    nodes'.${node}.nixpkgs.system
+      or (warn "${node}: Not specifying the `deployment.systemType` is deprecated!" "nixos");
 
   # Builds a patched version of nixpkgs, only as the source
   mkNixpkgs' =
@@ -33,17 +42,42 @@ let
       name = "nixos-${v}";
     };
 
+  # Build up the nixpkgs configuration for Liminix embedded systems
+  mkLiminixConfig =
+    system: _:
+    (import "${sources.liminix}/devices/${system}").system
+    // {
+      overlays = [ (import "${sources.liminix}/overlay.nix") ];
+      config = {
+        allowUnsupportedSystem = true; # mipsel
+        permittedInsecurePackages = [
+          "python-2.7.18.8" # Python < 3.x is needed for kernel backports.
+        ];
+      };
+    };
+
+  # Build up the arguments to instantiate a nixpkgs given a system and a version. 
+  mkNixpkgsConfig =
+    system: version:
+    if system == "nixos" then
+      { }
+    else if system == "zyxel-nwa50ax" then
+      (mkLiminixConfig system version)
+    else
+      (throw "Unknown system: ${system} for nixpkgs configuration instantiation");
+
   # Instanciates the required nixpkgs version
-  mkNixpkgs = version: import (mkNixpkgs' version) { };
+  mkSystemNixpkgs = system: version: import (mkNixpkgs' version) (mkNixpkgsConfig system version);
 
   ###
   # Function to create arguments based on the node
   #
   mkArgs = node: rec {
-    lib = nixpkgs.${version node}.lib // {
+    lib = nixpkgs.${systemType node}.${version node}.lib // {
       extra = nix-lib;
     };
 
+    sourcePkgs = nixpkgs.${systemType node}.${version node};
     meta = (import ./meta) lib;
 
     nodeMeta = meta.nodes.${node};
@@ -52,7 +86,7 @@ in
 
 {
   meta = {
-    nodeNixpkgs = nix-lib.mapSingleFuse (n: nixpkgs.${version n}) nodes;
+    nodeNixpkgs = nix-lib.mapSingleFuse (n: nixpkgs.${systemType n}.${version n}) nodes;
 
     specialArgs = {
       inherit nixpkgs sources;
@@ -63,40 +97,46 @@ in
     nodeSpecialArgs = nix-lib.mapSingleFuse mkArgs nodes;
   };
 
-  defaults =
-    { name, nodeMeta, ... }:
-    {
-      # Import the default modules
-      imports = [
-        ./modules
-        (import "${sources.lix-module}/module.nix" { inherit (sources) lix; })
-      ];
+  registry = {
+    nixos = {
+      # NOTE: this means that we are evaluating any system, independent of their actual nixpkgs version, with the unstable evaluation entrypoint.
+      evalConfig = args: import "${args.specialArgs.sourcePkgs.path}/nixos/lib/eval-config.nix" args;
+      defaults =
+        { name, nodeMeta, ... }:
+        {
+          # Import the default modules
+          imports = [
+            ./modules
+            (import "${sources.lix-module}/module.nix" { inherit (sources) lix; })
+          ];
 
-      # Include default secrets
-      age-secrets.sources = [ ./machines/${name}/secrets ];
+          # Include default secrets
+          age-secrets.sources = [ ./machines/${name}/secrets ];
 
-      # Deployment config is specified in meta.nodes.${node}.deployment
-      inherit (nodeMeta) deployment;
+          # Deployment config is specified in meta.nodes.${node}.deployment
+          inherit (nodeMeta) deployment;
 
-      nix = {
-        # Set NIX_PATH to the patched version of nixpkgs
-        nixPath = [ "nixpkgs=${mkNixpkgs' (version name)}" ];
-        optimise.automatic = true;
+          nix = {
+            # Set NIX_PATH to the patched version of nixpkgs
+            nixPath = [ "nixpkgs=${mkNixpkgs' (version name)}" ];
+            optimise.automatic = true;
 
-        gc = {
-          automatic = true;
-          dates = "weekly";
-          options = "--delete-older-than 7d";
+            gc = {
+              automatic = true;
+              dates = "weekly";
+              options = "--delete-older-than 7d";
+            };
+          };
+
+          # Allow unfree packages
+          nixpkgs.config.allowUnfree = true;
+
+          # Use the stateVersion declared in the metadata
+          system = {
+            inherit (nodeMeta) stateVersion;
+          };
         };
-      };
-
-      # Allow unfree packages
-      nixpkgs.config.allowUnfree = true;
-
-      # Use the stateVersion declared in the metadata
-      system = {
-        inherit (nodeMeta) stateVersion;
-      };
     };
+  };
 }
 // (nix-lib.mapSingleFuse mkNode nodes)

lib/nix-lib/default.nix

@@ -42,6 +42,7 @@ rec {
     recursiveUpdate
     splitString
     unique
+    warn
     ;
 
   /*

lib/nix-lib/nixpkgs.nix

@@ -453,10 +453,10 @@ rec {
       # `builtins.warn` requires a string message, so we enforce that in our implementation, so that callers aren't accidentally incompatible with newer Nix versions.
       assert builtins.isString msg;
       if mustAbort then
-        builtins.trace "␛[1;31mevaluation warning:␛[0m ${msg}" (
+        builtins.trace "evaluation warning: ${msg}" (
           abort "NIX_ABORT_ON_WARN=true; warnings are treated as unrecoverable errors."
         )
       else
-        builtins.trace "␛[1;35mevaluation warning:␛[0m ${msg}" v
+        builtins.trace "evaluation warning: ${msg}" v
     );
 }

machines/compute01/signal-irc-bridge.nix

@@ -9,7 +9,9 @@
 
   services.signal-irc-bridge = {
     enable = true;
-    package = nixpkgs.unstable.callPackage (sources.signal-irc-bridge.outPath + "/package.nix") { };
+    package = nixpkgs.nixos.unstable.callPackage (
+      sources.signal-irc-bridge.outPath + "/package.nix"
+    ) { };
     configFile = config.age.secrets."signal-irc-bridge-config".path;
   };
 

machines/compute01/stirling-pdf/default.nix

@@ -20,7 +20,7 @@ in
   services.stirling-pdf = {
     enable = true;
 
-    package = nixpkgs.unstable.stirling-pdf.overrideAttrs (old: {
+    package = nixpkgs.nixos.unstable.stirling-pdf.overrideAttrs (old: {
       patches = (old.patches or [ ]) ++ [
         (builtins.fetchurl "https://git.dgnum.eu/DGNum/Stirling-PDF/commit/${dgn-id}.patch")
       ];

machines/storage01/forgejo.nix

@@ -10,7 +10,7 @@ in
       enable = true;
 
       user = "git";
-      package = nixpkgs.unstable.forgejo;
+      package = nixpkgs.nixos.unstable.forgejo;
       stateDir = "/var/lib/git";
 
       database = {

machines/storage01/netbird.nix

@@ -15,7 +15,7 @@ in
     netbird.server = {
       enable = true;
 
-      package = nixpkgs.unstable.netbird;
+      package = nixpkgs.nixos.unstable.netbird;
 
       inherit domain;
 

machines/web01/netbox.nix

@@ -13,7 +13,7 @@ in
   services = {
     netbox = {
       enable = true;
-      package = nixpkgs.unstable.netbox_4_1;
+      package = nixpkgs.nixos.unstable.netbox_4_1;
       secretKeyFile = "/dev/null";
       listenAddress = "127.0.0.1";
       plugins = p: [ p.netbox-qrcode ];

meta/nixpkgs.nix

@@ -1,11 +1,24 @@
 {
-  # Default version of nixpkgs to use
-  default = "24.05";
+  versions = {
+    # Default version of nixpkgs to use
+    default = "24.05";
 
-  # Supported nixpkgs versions
-  supported = [
-    "unstable"
-    "23.11"
-    "24.05"
-  ];
+    # Supported nixpkgs versions
+    supported = [
+      "unstable"
+      "23.11"
+      "24.05"
+    ];
+  };
+
+  systems = {
+    # Default system for our deployments
+    default = "nixos";
+
+    # Supported system types
+    supported = [
+      "zyxel-nwa50ax"
+      "nixos"
+    ];
+  };
 }

meta/nodes.nix

@@ -44,7 +44,7 @@
 
     stateVersion = "23.05";
     nix-modules = [ "services/stirling-pdf" ];
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
   };
 
   geo01 = {
@@ -54,7 +54,7 @@
     hashedPassword = "$y$j9T$2XmDpJu.QLhV57yYCh5Lf1$LK.X0HKB02Q0Ujvhj5nIofW2IRrIAL/Uxnvl9AXM1L8";
 
     stateVersion = "24.05";
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
   };
 
   geo02 = {
@@ -64,7 +64,7 @@
     hashedPassword = "$y$j9T$Q4fbMpSm9beWu4DPNAR9t0$dx/1pH4GPY72LpS5ZiECXAZFDdxwmIywztsX.qo2VVA";
 
     stateVersion = "24.05";
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
   };
 
   rescue01 = {
@@ -84,7 +84,7 @@
     hashedPassword = "$y$j9T$tvRu1EJ9MwDSvEm0ogwe70$bKSw6nNteN0L3NOy2Yix7KlIvO/oROQmQ.Ynq002Fg8";
 
     stateVersion = "23.11";
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
 
     nix-modules = [
       "services/forgejo-nix-runners"
@@ -99,7 +99,7 @@
     hashedPassword = "$y$j9T$5osXVNxCDxu3jIndcyh7G.$UrjiDRpMu3W59tKHLGNdLWllZh.4p8IM4sBS5SrNrN1";
 
     stateVersion = "23.11";
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
 
     adminGroups = [ "fai" ];
   };
@@ -114,7 +114,7 @@
     stateVersion = "23.05";
     vm-cluster = "Hyperviseur NPS";
 
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
   };
 
   web02 = {
@@ -123,7 +123,7 @@
     hashedPassword = "$y$j9T$p42UVNy78PykkQOjPwXNJ/$B/zCUOrHXVSFGUY63wnViMiSmU2vCWsiX0y62qqgNQ5";
 
     stateVersion = "24.05";
-    nixpkgs = "24.05";
+    nixpkgs.version = "24.05";
     vm-cluster = "Hyperviseur NPS";
   };
 
@@ -133,7 +133,7 @@
     hashedPassword = "$y$j9T$Un/tcX5SPKNXG.sy/BcTa.$kyNHELjb1GAOWnauJfcjyVi5tacWcuEBKflZDCUC6x4";
 
     stateVersion = "24.05";
-    nixpkgs = "unstable";
+    nixpkgs.version = "unstable";
     vm-cluster = "Hyperviseur NPS";
   };
 }

meta/options.nix

@@ -11,6 +11,7 @@ let
   inherit (lib.types)
     attrs
     attrsOf
+    enum
     ints
     listOf
     nullOr
@@ -35,6 +36,7 @@ let
     };
 
   org = config.organization;
+  nixpkgs = import ./nixpkgs.nix;
 in
 
 {
@@ -137,12 +139,22 @@ in
                 '';
               };
 
-              nixpkgs = mkOption {
-                type = str;
-                inherit (import ./nixpkgs.nix) default;
-                description = ''
-                  Version of nixpkgs to use.
-                '';
+              nixpkgs = {
+                version = mkOption {
+                  type = enum nixpkgs.versions.supported;
+                  inherit (nixpkgs.versions) default;
+                  description = ''
+                    Version of nixpkgs to use.
+                  '';
+                };
+                system = mkOption {
+                  type = enum nixpkgs.systems.supported;
+                  inherit (nixpkgs.systems) default;
+                  description = ''
+                    Type of system for this node, will impact how it is evaluated and deployed.
+                  '';
+                  example = "zyxel-nwa50ax";
+                };
               };
 
               nix-modules = mkOption {

npins/sources.json

@@ -38,6 +38,17 @@
       "url": null,
       "hash": "09z5l5yh4zm0mf9hb3xc18gjk2dgv3l1icywrsxax00y1i1zlvna"
     },
+    "colmena": {
+      "type": "Git",
+      "repository": {
+        "type": "Git",
+        "url": "https://git.dgnum.eu/DGNum/colmena"
+      },
+      "branch": "main",
+      "revision": "71b1b660f2cda2e34e134d0028cafbd56bb22008",
+      "url": null,
+      "hash": "0pkzs70j1qch2238mbpl9aspzbkh0kgab25vnpr37nb75lmq81ij"
+    },
     "dgsi": {
       "type": "Git",
       "repository": {