From fc6c4f461ffbcfbd4784035a45bf2d879beedee0 Mon Sep 17 00:00:00 2001
From: Jack O'Sullivan <jackos1998@gmail.com>
Date: Sun, 17 Dec 2023 14:42:55 +0000
Subject: [PATCH] Add netboot archive (including to installer workflow)

---
 .gitea/workflows/installer.yaml | 25 ++++++++++++++++---------
 devshell/commands.nix           | 12 ++++++++++++
 nixos/modules/build.nix         | 11 +++++++++++
 3 files changed, 39 insertions(+), 9 deletions(-)

diff --git a/.gitea/workflows/installer.yaml b/.gitea/workflows/installer.yaml
index 4e79f9c..1ecbe77 100644
--- a/.gitea/workflows/installer.yaml
+++ b/.gitea/workflows/installer.yaml
@@ -1,4 +1,4 @@
-name: Installer ISO
+name: Installer
 
 on:
   push:
@@ -6,7 +6,7 @@ on:
 
 jobs:
   installer:
-    name: Build installer ISO
+    name: Build installer
     runs-on: ubuntu-22.04
     steps:
       - uses: actions/checkout@v4
@@ -24,20 +24,27 @@ jobs:
             extra-substituters = https://nix-cache.nul.ie/main
             extra-trusted-public-keys = main:mMChkG8LwXrFirVfudqjSHasK1jV31OVElYD3eImYl8=
       - name: Set up attic
+        id: setup
         run: |
           nix run .#nixpkgs.mine.x86_64-linux.attic-client -- \
             login --set-default colony https://nix-cache.nul.ie "${{ secrets.NIX_CACHE_TOKEN }}"
+          echo "short_rev=$(git rev-parse --short HEAD)" >> "$GITHUB_OUTPUT"
 
       - name: Build installer ISO
-        id: build
         run: |
-          nix build .#nixosConfigurations.installer.config.my.buildAs.iso
-          short_rev="$(git rev-parse --short HEAD)"
-          ln -s result/iso/nixos-installer-devplayer0.iso nixos-installer-devplayer0-$short_rev.iso
-          echo "short_rev=$short_rev" >> "$GITHUB_OUTPUT"
-      - name: Create release for ISO
+          nix build .#nixfiles.config.nixos.systems.installer.configuration.config.my.buildAs.iso
+          ln -s "$(readlink result)"/iso/nixos-installer-devplayer0.iso \
+            nixos-installer-devplayer0-${{ steps.setup.outputs.short_rev }}.iso
+      - name: Build installer netboot archive
+        run: |
+          nix build .#nixfiles.config.nixos.systems.installer.configuration.config.my.buildAs.netbootArchive
+          ln -s "$(readlink result)" \
+            nixos-installer-devplayer0-netboot-${{ steps.setup.outputs.short_rev }}.tar
+
+      - name: Create release
         uses: https://gitea.com/actions/release-action@main
         with:
           title: Latest installer
           files: |
-            nixos-installer-devplayer0-${{ steps.build.outputs.short_rev }}.iso
+            nixos-installer-devplayer0-${{ steps.setup.outputs.short_rev }}.iso
+            nixos-installer-devplayer0-netboot-${{ steps.setup.outputs.short_rev }}.tar
diff --git a/devshell/commands.nix b/devshell/commands.nix
index 736e246..a3fa286 100644
--- a/devshell/commands.nix
+++ b/devshell/commands.nix
@@ -97,6 +97,18 @@ in
       help = "Build NixOS configuration into an ISO";
       command = ''nix build "''${@:2}" ".#nixfiles.config.nixos.systems.\"$1\".configuration.config.my.buildAs.iso"'';
     }
+    {
+      name = "build-kexec";
+      category = "tasks";
+      help = "Build NixOS configuration as kexec tree";
+      command = ''nix build "''${@:2}" ".#nixfiles.config.nixos.systems.\"$1\".configuration.config.my.buildAs.kexecTree"'';
+    }
+    {
+      name = "build-netboot";
+      category = "tasks";
+      help = "Build NixOS configuration as netboot archive";
+      command = ''nix build "''${@:2}" ".#nixfiles.config.nixos.systems.\"$1\".configuration.config.my.buildAs.netbootArchive"'';
+    }
     {
       name = "build-home";
       category = "tasks";
diff --git a/nixos/modules/build.nix b/nixos/modules/build.nix
index 0a14349..aad2a11 100644
--- a/nixos/modules/build.nix
+++ b/nixos/modules/build.nix
@@ -43,6 +43,16 @@ let
     modules = flatten [
       "${modulesPath}/installer/netboot/netboot.nix"
       allHardware
+      ({ pkgs, config, ... }: {
+        system.build.netbootArchive = pkgs.runCommand "netboot-${config.system.name}-archive.tar" { } ''
+          ${pkgs.gnutar}/bin/tar -rvC "${config.system.build.kernel}" \
+            -f "$out" "${config.system.boot.loader.kernelFile}"
+          ${pkgs.gnutar}/bin/tar -rvC "${config.system.build.netbootRamdisk}" \
+            -f "$out" initrd
+          ${pkgs.gnutar}/bin/tar -rvC "${config.system.build.netbootIpxeScript}" \
+            -f "$out" netboot.ipxe
+        '';
+      })
     ];
   };
 
@@ -99,6 +109,7 @@ in
         iso = config.my.asISO.config.system.build.isoImage;
         container = config.my.asContainer.config.system.build.toplevel;
         kexecTree = config.my.asKexecTree.config.system.build.kexecTree;
+        netbootArchive = config.my.asKexecTree.config.system.build.netbootArchive;
       };
     };
   };