From 1c7fcddb45ca5bd474bfc438986617c1d2696c67 Mon Sep 17 00:00:00 2001
From: Linnnus <linnnus@users.noreply.github.com>
Date: Thu, 27 Mar 2025 19:29:17 +0000
Subject: ali: Add ahmed as remote builder

---
 hosts/ali/configuration.nix                 |  1 +
 hosts/ali/remote-builders/ahmed-builder.nix | 36 +++++++++++++++++++++++++++++
 hosts/ali/remote-builders/default.nix       | 10 ++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 hosts/ali/remote-builders/ahmed-builder.nix
 create mode 100644 hosts/ali/remote-builders/default.nix

diff --git a/hosts/ali/configuration.nix b/hosts/ali/configuration.nix
index 373d637..e62f1a8 100644
--- a/hosts/ali/configuration.nix
+++ b/hosts/ali/configuration.nix
@@ -15,6 +15,7 @@
 
     ./wireless-networking
     ./desktop-environment
+    ./remote-builders
   ];
 
   # Should match containing folder.
diff --git a/hosts/ali/remote-builders/ahmed-builder.nix b/hosts/ali/remote-builders/ahmed-builder.nix
new file mode 100644
index 0000000..0da0fc5
--- /dev/null
+++ b/hosts/ali/remote-builders/ahmed-builder.nix
@@ -0,0 +1,36 @@
+# This module adds ahmed as a remote builder for ali.
+# Note that ahmed is configured such that root@ali is allowed to connect to remotebuilder@ahmed.
+# TODO: Dedublicate with hosts/muhammed/remote-builders/ahmed-builder.nix
+
+{metadata, ...}: {
+  nix.buildMachines = [
+    {
+      protocol = "ssh-ng";
+      hostName = "ahmed-builder";
+
+      system = "x86_64-linux";
+      maxJobs = 1;
+      speedFactor = 1;
+      supportedFeatures = ["nixos-test" "benchmark" "big-parallel" "kvm"];
+      mandatoryFeatures = [];
+    }
+  ];
+
+  environment.etc."ssh/ssh_config.d/100-ahmed-builder.conf".text = ''
+    Host ahmed-builder
+      User remotebuilder
+      Hostname ${metadata.hosts.ahmed.ipv4Address}
+      HostKeyAlias ahmed-builder
+      # This matches `users.users.<builder>.authorizedKeys` on the server-side.
+      # HACK: We should use a purpose-specific key.
+      IdentityFile /Users/linus/.ssh/id_rsa
+  '';
+
+  # We have to trust ahmeds host key or the Nix daemon will fail to connect.
+  programs.ssh.knownHosts = {
+    ahmed-builder = {
+      hostNames = ["ahmed-builder"];
+      publicKey = metadata.hosts.ahmed.sshKeys.root;
+    };
+  };
+}
diff --git a/hosts/ali/remote-builders/default.nix b/hosts/ali/remote-builders/default.nix
new file mode 100644
index 0000000..d9e4e46
--- /dev/null
+++ b/hosts/ali/remote-builders/default.nix
@@ -0,0 +1,10 @@
+{
+  imports = [
+    ./ahmed-builder.nix
+  ];
+
+  # Our interactive user must be trusted in order to use remote builders. I
+  # guess this is because otherwise an untrusted user could use their own
+  # remote builder to replace arbitrary store files...
+  nix.settings.trusted-users = ["linus"];
+}
-- 
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