From df02e465133be72aafbb083c16d80188cc8f1b13 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Sat, 17 Apr 2021 20:32:02 +0200
Subject: support for building installers

---
 flake.lock    | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 flake.nix     | 21 ++++++++++++++----
 installer.nix |  1 +
 3 files changed, 89 insertions(+), 4 deletions(-)
 create mode 100644 flake.lock
 create mode 100644 installer.nix

diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..2a0a02da
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,71 @@
+{
+  "nodes": {
+    "home-manager": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1618469593,
+        "narHash": "sha256-fNdt+Q3irnT3pId7PKSSVeR8/9inBrAEg4gpItoRowU=",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "ebbbd4f2b50703409543941e7445138dc1e7392e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "ref": "master",
+        "repo": "home-manager",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1618681372,
+        "narHash": "sha256-fjiabnBl20D/jc3bU3K16jP21bf5l2fG1rHij0LoHVk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c27aea5e879748c79acf3b6681194fcf184e3eba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "master",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "home-manager": "home-manager",
+        "nixpkgs": "nixpkgs",
+        "sops-nix": "sops-nix"
+      }
+    },
+    "sops-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1618226608,
+        "narHash": "sha256-Hq/lcu48RhE3U6gYYkuT7v6hLHeu1PrasiaBiGkCX+w=",
+        "owner": "Mic92",
+        "repo": "sops-nix",
+        "rev": "ade2f5c17184df9d4c42d36da18a6ed903b4c02d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "Mic92",
+        "ref": "master",
+        "repo": "sops-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 3c1507dd..e2567e84 100644
--- a/flake.nix
+++ b/flake.nix
@@ -41,7 +41,7 @@
           accountName' = splitString "@" accountName;
         in elemAt accountName' 1;
 
-      mkNixosConfiguration = dir: path: hostName: nixosSystem rec {
+      mkNixosConfiguration = addProfiles: dir: path: hostName: nixosSystem rec {
         specialArgs = {
           flake = self;
           flakeInputs = inputs;
@@ -60,7 +60,7 @@
             };
             accountModules = attrValues (filterAttrs accountMatchesHost self.nixosModules.accounts);
             accountMatchesHost = n: _v: accountHostName n == hostName;
-          in attrValues (filterAttrs (n: _v: !(elem n ["systemProfiles" "users" "userProfiles" "accounts"])) self.nixosModules) ++ [ argsModule ] ++ defaultProfiles ++ [ local ] ++ accountModules;
+          in attrValues (filterAttrs (n: _v: !(elem n ["systemProfiles" "users" "userProfiles" "accounts"])) self.nixosModules) ++ [ argsModule ] ++ defaultProfiles ++ addProfiles ++ [ local ] ++ accountModules;
       };
 
       mkSystemProfile = dir: path: profileName: {
@@ -110,6 +110,19 @@
       activateNixosConfigurations = forAllSystems (system: _pkgs: mapAttrs' (hostName: nixosConfig: nameValuePair "${hostName}-activate" { type = "app"; program = "${nixosConfig.config.system.build.toplevel}/bin/switch-to-configuration"; }) self.nixosConfigurations);
 
       overlayPaths = recImport rec { dir = ./overlays; _import = (path: _name: dir + "/${path}"); } // { pkgs = ./pkgs; };
+
+      installerProfiles = system:
+        let nixpkgs-path = nixpkgs.legacyPackages.${system}.path;
+        in mapAttrs (name: {path, output}: { profile = mkSystemProfile nixpkgs-path path "installer-${name}"; inherit output; })
+          { cd-dvd = { path = "nixos/modules/installer/cd-dvd/installation-cd-minimal.nix"; output = out: out.config.system.build.isoImage; };
+            netboot = { path = "nixos/modules/installer/netboot/netboot-minimal.nix"; output = out: (self.legacyPackages.${system}.symlinkJoin { name = "netboot"; paths = with out.config.system.build; [ netbootRamdisk kernel netbootIpxeScript ]; preferLocalBuild = true; }); };
+          };
+
+      installers =
+        let mkInstallers = system: mapAttrs (mkInstaller system) (installerProfiles system);
+            mkInstaller = system: name: {profile, output}: output (mkNixosConfiguration [profile { config = { nixpkgs.system = system; }; }] ./. installerConfig "installer");
+            installerConfig = if builtins.pathExists ./installer.nix then "installer.nix" else (if builtins.pathExists ./installer then "installer" else null);
+        in if !(builtins.isNull installerConfig) then { installers = forAllSystems (system: _systemPkgs: mkInstallers system); } else {};
     in
       {
         nixosModules =
@@ -120,7 +133,7 @@
               accounts = recursiveUpdate rootAccounts (recImport rec { dir = ./accounts; _import = mkAccountModule dir; });
               rootAccounts = mapAttrs' (hostName: _value: nameValuePair "root@${hostName}" ({...}: { imports = [ self.nixosModules.users.root or ({...}: { imports = defaultUserProfiles "root"; }) ]; })) self.nixosConfigurations;
           in modulesAttrs // { inherit systemProfiles users userProfiles accounts; };
-        nixosConfigurations = recImport rec { dir = ./hosts; _import = mkNixosConfiguration dir; };
+        nixosConfigurations = recImport rec { dir = ./hosts; _import = mkNixosConfiguration [] dir; };
 
         homeManagerModules = recImport rec { dir = ./home-modules; };
 
@@ -142,5 +155,5 @@
           path = ./.;
           description = "GKleen's flakey nixos configuration";
         };
-      };
+      } // installers;
 }
diff --git a/installer.nix b/installer.nix
new file mode 100644
index 00000000..64629674
--- /dev/null
+++ b/installer.nix
@@ -0,0 +1 @@
+{...}: {}
-- 
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