From ae6cce96a29e7e6d901593002b48e16b41e8b247 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Sun, 5 Oct 2025 20:14:01 -0400
Subject: [PATCH] Support running arm code on x86.

---
 nix/configuration/configuration.nix           |  1 +
 nix/configuration/hosts/odo/default.nix       |  1 +
 nix/configuration/hosts/quark/default.nix     |  1 +
 .../roles/emulate_isa/default.nix             | 33 +++++++++++++++++++
 4 files changed, 36 insertions(+)
 create mode 100644 nix/configuration/roles/emulate_isa/default.nix

diff --git a/nix/configuration/configuration.nix b/nix/configuration/configuration.nix
index 256de92..8139139 100644
--- a/nix/configuration/configuration.nix
+++ b/nix/configuration/configuration.nix
@@ -22,6 +22,7 @@
     ./roles/docker
     ./roles/ecc
     ./roles/emacs
+    ./roles/emulate_isa
     ./roles/firefox
     ./roles/firewall
     ./roles/flux
diff --git a/nix/configuration/hosts/odo/default.nix b/nix/configuration/hosts/odo/default.nix
index 5379805..6776c31 100644
--- a/nix/configuration/hosts/odo/default.nix
+++ b/nix/configuration/hosts/odo/default.nix
@@ -71,6 +71,7 @@
     me.docker.enable = false;
     me.ecc.enable = false;
     me.emacs_flavor = "full";
+    me.emulate_isa.enable = true;
     me.firefox.enable = true;
     me.flux.enable = true;
     me.gcloud.enable = true;
diff --git a/nix/configuration/hosts/quark/default.nix b/nix/configuration/hosts/quark/default.nix
index 09a61c9..25d8df7 100644
--- a/nix/configuration/hosts/quark/default.nix
+++ b/nix/configuration/hosts/quark/default.nix
@@ -64,6 +64,7 @@
     me.docker.enable = false;
     me.ecc.enable = true;
     me.emacs_flavor = "full";
+    me.emulate_isa.enable = true;
     me.firefox.enable = true;
     me.flux.enable = true;
     me.gcloud.enable = true;
diff --git a/nix/configuration/roles/emulate_isa/default.nix b/nix/configuration/roles/emulate_isa/default.nix
new file mode 100644
index 0000000..183eb4e
--- /dev/null
+++ b/nix/configuration/roles/emulate_isa/default.nix
@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    emulate_isa.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to enable emulating other CPU architectures.";
+    };
+  };
+
+  config = lib.mkIf config.me.emulate_isa.enable (
+    lib.mkMerge [
+      {
+        boot.binfmt.emulatedSystems = [
+          "aarch64-linux" # Raspberry Pi gen 3
+          "riscv64-linux"
+          # TODO: Should "x86_64-linux" be in this list or should this list be dependent on the host CPU?
+          "armv6l-linux" # Raspberry Pi gen 1
+        ];
+      }
+    ]
+  );
+}
+# NOTE: build nixosConfigurations.<name>.config.system.build.sdImage