From 29fe1fbeca944fbeda9711493c146caa416874b1 Mon Sep 17 00:00:00 2001
From: yuri <yuri@nekover.se>
Date: Sun, 30 Jul 2023 01:38:31 +0200
Subject: [PATCH] Test host specific nixpkgs

---
 flake.lock | 25 +++++++++++++---
 flake.nix  | 85 ++++++++++--------------------------------------------
 helper.nix | 45 +++++++++++++++--------------
 hosts.nix  | 47 ++++++++++++++++++++++++++++++
 4 files changed, 106 insertions(+), 96 deletions(-)
 create mode 100644 hosts.nix

diff --git a/flake.lock b/flake.lock
index ad39d0d..5034288 100644
--- a/flake.lock
+++ b/flake.lock
@@ -38,11 +38,27 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1690538549,
-        "narHash": "sha256-FfScFHxidupVGPw9BrQOHz/SoFLRjoNmVC5ymS+g8xU=",
+        "lastModified": 1690630041,
+        "narHash": "sha256-gbnvqm5goS9DSKAqGFpq3398aOpwejmq4qWikqmQyRo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "de5ca86149b0c4ff8bf69782cd25896fff0254e1",
+        "rev": "d57e8c535d4cbb07f441c30988ce52eec69db7a8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05-small",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-unstable": {
+      "locked": {
+        "lastModified": 1690628621,
+        "narHash": "sha256-fHmW03fQziNt1+tt/Goa0lwObsR8kY8auNEWnv92Sfw=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "9508c7104d697af158ebc719586d64eb7b64c0d7",
         "type": "github"
       },
       "original": {
@@ -55,7 +71,8 @@
     "root": {
       "inputs": {
         "nixos-generators": "nixos-generators",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs",
+        "nixpkgs-unstable": "nixpkgs-unstable"
       }
     }
   },
diff --git a/flake.nix b/flake.nix
index c8ae23e..92fda46 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,90 +1,35 @@
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-23.05-small";
+    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable-small";
     nixos-generators = {
       url = "github:nix-community/nixos-generators";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
 
-  outputs = { self, nixpkgs, nixos-generators, ... }@inputs: let
+  outputs = { self, nixpkgs, nixpkgs-unstable, nixos-generators, ... }@inputs: let
+    hosts = import ./hosts.nix inputs;
     helper = (import ./helper.nix) inputs; 
   in {
-    hosts = {
-      hydra = {
-        site = "vs";
-      };
-      iperf = {
-        site = "vs";
-      };
-      jackett = {
-        site = "vs";
-      };
-      nitter = {
-        site = "vs";
-      };
-      nixos-coturn = {
-        site = "vs";
-      };
-      tor-relay = {
-        site = "vs";
-      };
-      web-public-2 = {
-        site = "vs";
-      };
-    };
-
-    generateColmenaHost = name: host: {
-      deployment = {
-        targetHost = "${name}.${host.site}.grzb.de";
-        targetUser = "colmena-deploy";
-      };
-
-      imports = [
-        ./configuration/common
-        ./configuration/proxmox-vm
-        ./configuration/proxmox-vm/hardware-configuration.nix
-        ./hosts/${name}
-      ] ++ nixpkgs.lib.optional (builtins.pathExists ./hosts/${name}/secrets.nix) ./hosts/${name}/secrets.nix;
-    };
-
     colmena = {
       meta = {
-        nixpkgs = import nixpkgs {
-          system = "x86_64-linux";
-        };
+        # Set the default pkgs, which is pointless in this case,
+        # because nodeNixpkgs is overriding it anyway and a default value is generated.
+        # It is still needed for colmena to run.
+        nixpkgs = nixpkgs.legacyPackages."x86_64-linux";
+
+        # Specify nixpkgs to use for each host.
+        # The default is "nixpkgs" for "x86_64-linux" systems,
+        # but it is overridden by the host-specific "hostNixpkgs" and "system" attributes.
+        nodeNixpkgs = builtins.mapAttrs (name: host: host.pkgs) hosts;
       };
-    } // builtins.mapAttrs (self.generateColmenaHost) self.hosts;
-
-    nixosConfigurations = nixpkgs.lib.mapAttrs (name: config: let
-      nodeNixpkgs = self.outputs.colmena.meta.nodeNixpkgs.${name} or self.outputs.colmena.meta.nixpkgs;
-      nodeNixos = import (nodeNixpkgs.path + "/nixos/lib/eval-config.nix");
-      in nodeNixos {
-        modules = [
-          #self.outputs.colmena.defaults
-          config
-          #inputs.colmena.nixosModules.deploymentOptions
-          {
-            _module.args.name = nixpkgs.lib.mkForce name;
-            _module.args.nodes = self.outputs.nixosConfigurations;
-            #nixpkgs.overlays = nixpkgs.lib.attrValues self.overlays;
-          }
-        ];
-        inherit (nodeNixpkgs) system;
-      }
-    ) (builtins.removeAttrs self.outputs.colmena ["meta" "defaults"]);
+    } // builtins.mapAttrs (helper.generateColmenaHost) hosts;
 
     hydraJobs = {
-      nixosConfigurations = nixpkgs.lib.mapAttrs (_: config: config.config.system.build.toplevel) self.outputs.nixosConfigurations;
+      nixConfigurations = builtins.mapAttrs (helper.generateNixConfiguration) hosts;
     };
 
-    /*
-    nixosConfigurations = (builtins.mapAttrs (helper.mapToNixosConfigurations) self.hosts);
-    hydraJobs = {
-      nixConfigurations = helper.buildHosts self.nixosConfigurations;
-    };
-    */
-
     # Generate a base VM image for Proxmox with `nix build .#base-proxmox`
     packages.x86_64-linux = {
       base-proxmox = nixos-generators.nixosGenerate {
diff --git a/helper.nix b/helper.nix
index 07a3e8e..fc91e4e 100644
--- a/helper.nix
+++ b/helper.nix
@@ -1,25 +1,26 @@
-{ nixpkgs, ... }@inputs:
-rec {
-  generateNixosSystem = name: {
-    system ? "x86_64-linux",
-    group ? null,
-    modules ? [],
-    site
-  }: let
-    localNixpkgs = nixpkgs.lib.attrByPath [ "nixpkgs-${name}" ] nixpkgs inputs;
-  in localNixpkgs.lib.nixosSystem {
-    system = system;
-    modules = modules ++ [
-      ./configuration/common
-      ./configuration/proxmox-vm
-      ./configuration/proxmox-vm/hardware-configuration.nix
-      ./hosts/${name}
-    ];
+{ nixpkgs, ... }:
+{
+  generateColmenaHost = name: {
+    site,
+    modules,
+    ...
+  }: {
+    deployment = {
+      targetHost = "${name}.${site}.grzb.de";
+      targetUser = "colmena-deploy";
+    };
+
+    # Set imports and optionally import colmena secrets configuration
+    imports = modules ++ nixpkgs.lib.optional (builtins.pathExists ./hosts/${name}/secrets.nix) ./hosts/${name}/secrets.nix;
   };
 
-  mapToNixosConfigurations = name: host: generateNixosSystem name host;
-
-  filterUnderscore = hosts: (nixpkgs.lib.filterAttrs (name: host: (builtins.substring 0 1 name) != "_") hosts);
-
-  buildHosts = hosts: builtins.mapAttrs (name: host: host.config.system.build.toplevel) (filterUnderscore hosts);
+  generateNixConfiguration = name: {
+    hostNixpkgs,
+    system,
+    modules,
+    ...
+  }: 
+  (nixpkgs.lib.filterAttrs (name: host: (builtins.substring 0 1 name) != "_") (hostNixpkgs.lib.nixosSystem {
+    inherit system modules;
+  })).config.system.build.toplevel;
 }
diff --git a/hosts.nix b/hosts.nix
new file mode 100644
index 0000000..083d5b8
--- /dev/null
+++ b/hosts.nix
@@ -0,0 +1,47 @@
+{ nixpkgs, nixpkgs-unstable, ... }:
+let
+  environments = {
+    "proxmox" = [
+      ./configuration/proxmox-vm
+      ./configuration/proxmox-vm/hardware-configuration.nix
+    ]; 
+  };
+  generateDefaults = hosts: builtins.mapAttrs (name: {
+    hostNixpkgs ? nixpkgs,
+    system ? "x86_64-linux",
+    pkgs ? hostNixpkgs.legacyPackages.${system},
+    environment ? "proxmox",
+    site
+  }: {
+    inherit hostNixpkgs system pkgs environment site;
+    modules = [
+      ./configuration/common
+      ./hosts/${name}
+    ] ++ (if environments ? ${environment} then environments.${environment} else []);
+  }) hosts;
+in
+  generateDefaults {
+    hydra = {
+      hostNixpkgs = nixpkgs-unstable;
+      site = "vs";
+    };
+    iperf = {
+      site = "vs";
+    };
+    jackett = {
+      site = "vs";
+    };
+    nitter = {
+      site = "vs";
+    };
+    nixos-coturn = {
+      site = "vs";
+    };
+    tor-relay = {
+      site = "vs";
+    };
+    web-public-2 = {
+      hostNixpkgs = nixpkgs-unstable;
+      site = "vs";
+    };
+  }