From 9248259708bd6ade5e334a2cdfb29d2a20acb0dd Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Mon, 3 Oct 2022 17:15:36 +0200
Subject: ...

---
 hosts/vidhar/network/dhcp/default.nix | 58 ++++++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 14 deletions(-)

(limited to 'hosts/vidhar/network/dhcp')

diff --git a/hosts/vidhar/network/dhcp/default.nix b/hosts/vidhar/network/dhcp/default.nix
index 067dc6d6..e14b15ac 100644
--- a/hosts/vidhar/network/dhcp/default.nix
+++ b/hosts/vidhar/network/dhcp/default.nix
@@ -1,4 +1,7 @@
 { flake, config, pkgs, lib, ... }:
+
+with lib;
+
 {
   config = {
     services.kea = {
@@ -23,7 +26,7 @@
             { name = "ipxe";
               test = "option[77].hex == 'iPXE'";
               next-server = "10.141.0.1";
-              boot-file-name = "netboot.ipxe";
+              boot-file-name = "installer-x86_64-linux/netboot.ipxe";
               only-if-required = true;
             }
             { name = "uefi-64";
@@ -146,7 +149,7 @@
               pools = [ { pool = "10.141.2.128 - 10.141.2.254"; } ];
               reservations = [];
             }
-          ]; 
+          ];
         };
       };
       # dhcp6 = {
@@ -195,16 +198,16 @@
     };
 
     systemd.services.kea-dhcp-ddns-server = {
-      preStart = let 
+      preStart = let
         configLines = [
           "<?include \"\${CREDENTIALS_DIRECTORY}/knot-tsig.json.frag\"?>"
-        ] ++ lib.mapAttrsToList (k: v:
+        ] ++ mapAttrsToList (k: v:
           "\"${k}\": ${builtins.toJSON v}"
         ) config.services.kea.dhcp-ddns.settings;
 
         config-template = pkgs.writeText "dhcp-ddns.conf" ''
           {"DhcpDdns": {
-            ${lib.concatStringsSep ",\n  " configLines}
+            ${concatStringsSep ",\n  " configLines}
           }}
         '';
       in ''
@@ -212,8 +215,8 @@
       '';
 
       serviceConfig = {
-        ExecStart = lib.mkForce ''
-          ${pkgs.kea}/bin/kea-dhcp-ddns -c "''${RUNTIME_DIRECTORY}/dhcp-ddns.conf" ${lib.escapeShellArgs config.services.kea.dhcp-ddns.extraArgs}
+        ExecStart = mkForce ''
+          ${pkgs.kea}/bin/kea-dhcp-ddns -c "''${RUNTIME_DIRECTORY}/dhcp-ddns.conf" ${escapeShellArgs config.services.kea.dhcp-ddns.extraArgs}
         '';
         LoadCredential = [
           "knot-tsig.json.frag:${config.sops.secrets."kea-knot-tsig.json.frag".path}"
@@ -226,26 +229,53 @@
       sopsFile = ./knot-tsig.json.frag;
     };
 
-    systemd.services."installer-atftpd" = {
-      description = "TFTP Server for PXE Booting NixOS Installer";
+    systemd.services."pxe-atftpd" = {
+      description = "TFTP Server for PXE Booting";
       after = [ "network.target" ];
       wantedBy = [ "multi-user.target" ];
       serviceConfig.ExecStart = let
-        installerBuild = flake.nixosConfigurations.installer-x86_64-linux-netboot.config.system.build;
         ipxe = pkgs.ipxe.override {
           additionalTargets = {
             "bin-i386-efi/ipxe.efi" = "i386-ipxe.efi";
           };
         };
-        tftpRoot = pkgs.runCommandLocal "installer-netboot" {} ''
+        tftpRoot = pkgs.runCommandLocal "netboot" {} ''
           mkdir -p $out
           install -m 0444 -t $out \
-            ${installerBuild.netbootRamdisk}/initrd \
-            ${installerBuild.kernel}/bzImage \
-            ${installerBuild.netbootIpxeScript}/netboot.ipxe \
             ${ipxe}/ipxe.efi ${ipxe}/i386-ipxe.efi ${ipxe}/undionly.kpxe
+
+          ${concatMapStringsSep "\n" (system:
+            let
+              installerBuild = (flake.nixosConfigurations.${"installer-${system}-nfsroot"}.extendModules {
+                modules = [
+                  ({ ... }: { config.nfsroot.storeDevice = "vidhar:nix-store"; })
+                ];
+              }).config.system.build;
+            in ''
+              mkdir -p $out/installer-${system}
+              install -m 0444 -t $out/installer-${system} \
+                ${installerBuild.initialRamdisk}/initrd \
+                ${installerBuild.kernel}/bzImage \
+                ${installerBuild.netbootIpxeScript}/netboot.ipxe
+            ''
+          ) ["x86_64-linux"]}
         '';
       in "${pkgs.atftp}/sbin/atftpd --daemon --no-fork --bind-address=10.141.0.1 ${tftpRoot}";
     };
+
+    services.nfs.server = {
+      enable = true;
+      createMountPoints = true;
+      exports = ''
+        /export/nix-root 10.141.0.0/24(ro)
+      '';
+    };
+
+    fileSystems = {
+      "/export/nix-root" = {
+        device = "/nix/store";
+        options = [ "bind" ];
+      };
+    };
   };
 }
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