feat(sys/boot): Provide the latest arch-iso as boot target

3 files changed, 126 insertions, 10 deletions

diff --git a/sys/boot/archlive_iso.nix b/sys/boot/archlive_iso.nix
new file mode 100644
index 00000000..d19a4a87
--- /dev/null
+++ b/sys/boot/archlive_iso.nix
@@ -0,0 +1,77 @@
+{pkgs ? (builtins.getFlake "nixpkgs").legacyPackages."x86_64-linux"}: let
+  signing_key = import ./signing_key.nix {inherit pkgs;};
+
+  checked_iso = pkgs.stdenv.mkDerivation {
+    pname = "archlinux-iso";
+    version = "2024.05.01";
+
+    srcs = [
+      (pkgs.fetchurl {
+        url = "https://archlinux.org/iso/2024.05.01/archlinux-2024.05.01-x86_64.iso.sig";
+        hash = "sha256-QOGYng6a7zA5EJKGotDccJ7fD2MmPPXQEdVr1kjJvi4=";
+      })
+      (pkgs.fetchurl {
+        url = "https://mirror.informatik.tu-freiberg.de/arch/iso/latest/archlinux-2024.05.01-x86_64.iso";
+        hash = "sha256-G0oE74pzUIUqEwcO5JhEKwh6YHoYhAtN19mYZ+tfakw=";
+      })
+      (pkgs.fetchurl {
+        url = "https://archlinux.org/iso/2024.05.01/b2sums.txt";
+        hash = "sha256-HSMS13hHXFKKQsCA8spa7XtirHCBTmePwhOsStVPbHw=";
+      })
+    ];
+
+    dontUnpack = true;
+
+    nativeBuildInputs = with pkgs; [
+      sequoia-sq
+    ];
+
+    buildPhase =
+      /*
+      bash
+      */
+      ''
+        cp -r "${signing_key}" ./release-key.pgp
+        for src in $srcs; do
+          cp -r  "$src" "$(stripHash "$src")"
+        done
+
+        sed '2d;3d;4d' b2sums.txt > b2sums_clean.txt
+
+        # As per the directions from: https://archlinux.org/download/
+
+        # blake hash check
+        b2sum -c ./b2sums_clean.txt
+
+        # pgp signature check
+        sq verify --signer-file release-key.pgp --detached archlinux-2024.05.01-x86_64.iso.sig archlinux-2024.05.01-x86_64.iso
+      '';
+
+    installPhase = ''
+      cp archlinux-2024.05.01-x86_64.iso "$out";
+    '';
+  };
+in
+  pkgs.stdenv.mkDerivation {
+    name = "live_iso_boot_entry";
+
+    src = checked_iso;
+
+    dontUnpack = true;
+
+    nativeBuildInputs = with pkgs; [
+      libarchive # for bsdtar
+    ];
+
+    buildPhase = ''
+      mkdir iso
+      bsdtar -xf "$src" -C iso
+    '';
+
+    installPhase = ''
+      install -D ./iso/arch/boot/x86_64/initramfs-linux.img "$out/live/initramfs-linux.img"
+      install -D ./iso/arch/boot/x86_64/vmlinuz-linux "$out/live/vmlinuz-linux"
+
+      install -D "$src" "$out/archlinux.iso"
+    '';
+  }
diff --git a/sys/boot/default.nix b/sys/boot/default.nix
index 9606c7b3..625394e8 100644
--- a/sys/boot/default.nix
+++ b/sys/boot/default.nix
@@ -1,8 +1,4 @@
-{
-  pkgs,
-  lib,
-  ...
-}: {
+{pkgs, ...}: {
   boot = {
     initrd = {
       #compressor = "lz4";
@@ -15,14 +11,39 @@
     lanzaboote = {
       enable = true;
       pkiBundle = "/etc/secureboot";
+
+      settings = {
+      };
     };
 
     loader = {
-      # Lanzaboote currently replaces the systemd-boot module.
-      # This setting is usually set to true in configuration.nix
-      # generated at installation time. So we force it to false
-      # for now.
-      systemd-boot.enable = lib.mkForce false;
+      systemd-boot = {
+        # Lanzaboote currently replaces the systemd-boot module.
+        # This setting is usually set to true in configuration.nix
+        # generated at installation time. So we force it to false
+        # for now.
+        enable = false;
+
+        # Disable editing the kernel command line (which could allow someone to become root)
+        editor = false;
+
+        extraEntries = {
+          "live.conf" = ''
+            title Archlinux Live ISO
+            linux /live/vmlinuz-linux
+            initrd /live/initramfs-linux.img
+            options img_loop=/archlinux.iso copytoram
+          '';
+        };
+
+        extraFiles = let
+          iso = import ./archlive_iso.nix {inherit pkgs;};
+        in {
+          "archlinux.iso" = "${iso}/archlinux.iso";
+          "live/initramfs-linux.img" = "${iso}/live/initramfs-linux.img";
+          "live/vmlinuz-linux" = "${iso}/live/vmlinuz-linux";
+        };
+      };
 
       grub = {
         enable = false;
diff --git a/sys/boot/signing_key.nix b/sys/boot/signing_key.nix
new file mode 100644
index 00000000..788447be
--- /dev/null
+++ b/sys/boot/signing_key.nix
@@ -0,0 +1,18 @@
+{pkgs ? (builtins.getFlake "nixpkgs").legacyPackages."x86_64-linux"}:
+pkgs.stdenv.mkDerivation {
+  name = "archlinux_signing_keys";
+
+  outputHash = "sha256-evGWzkxMaZw3rlixKsyWCS/ZvNuZ+OfXQb6sgiHz9XY=";
+  outputHashAlgo = "sha256";
+  NIX_SSL_CERT_FILE = "${pkgs.cacert}/etc/ssl/certs/ca-bundle.crt";
+
+  nativeBuildInputs = with pkgs; [
+    sequoia-sq
+  ];
+
+  dontUnpack = true;
+
+  buildPhase = ''
+    sq --verbose --no-cert-store --no-key-store network wkd fetch pierre@archlinux.org --output "$out"
+  '';
+}