From 4ac5c707ec32af755bbe89e06440d670dc0a45ef Mon Sep 17 00:00:00 2001
From: Max <max@privatevoid.net>
Date: Tue, 23 Jul 2024 02:44:12 +0200
Subject: [PATCH] cluster/simulacrum: init

---
 cluster/simulacrum/default.nix | 111 +++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 cluster/simulacrum/default.nix

diff --git a/cluster/simulacrum/default.nix b/cluster/simulacrum/default.nix
new file mode 100644
index 0000000..a889189
--- /dev/null
+++ b/cluster/simulacrum/default.nix
@@ -0,0 +1,111 @@
+{ testers, config, extendModules, lib, system }:
+
+{ service }:
+
+let
+  serviceConfig = config.cluster.config.services.${service};
+  serviceList = [ service ] ++ serviceConfig.simulacrum.deps;
+  allAugments = map (svc: config.cluster.config.services.${svc}.simulacrum.augments) serviceList;
+
+  lift = config;
+
+  snakeoil = {
+    ssh = {
+      public = lib.fileContents ../../packages/checks/snakeoil/ssh/snakeoil-key.pub;
+      private = ../../packages/checks/snakeoil/ssh/snakeoil-key;
+    };
+  };
+
+  nodes = lib.attrNames config.gods.fromLight;
+  digits = lib.attrsets.listToAttrs (lib.zipListsWith lib.nameValuePair nodes (lib.range 1 255));
+  depot' = extendModules {
+    modules = [
+      ({ config, ... }: {
+        gods.fromLight = lib.mapAttrs (name: cfg: {
+          interfaces.primary = {
+            link = lib.mkForce "vprimary";
+          };
+          ssh.id.publicKey = lib.mkForce snakeoil.ssh.public;
+        }) lift.gods.fromLight;
+
+        cluster = lib.mkForce (lift.cluster.extendModules {
+          specialArgs.depot = config;
+          modules = [
+            { simulacrum = true; }
+          ];
+        });
+      })
+    ];
+  };
+  specialArgs = depot'.config.lib.summon system lib.id;
+in
+
+testers.runNixOSTest {
+  name = "simulacrum-${service}";
+
+  imports = [
+    serviceConfig.simulacrum.settings
+  ] ++ allAugments;
+
+  _module.args = {
+    inherit (depot'.config) cluster;
+  };
+
+  node = { inherit specialArgs; };
+  nodes = lib.genAttrs nodes (node: let
+    hour = depot'.config.hours.${node};
+  in {
+    imports = [
+      specialArgs.depot.hours.${node}.nixos
+      ../../packages/checks/modules/nixos/age-dummy-secrets
+      ../../packages/checks/modules/nixos/external-storage.nix
+    ] ++ depot'.config.cluster.config.out.injectNixosConfigForServices serviceList node;
+
+    boot.kernel.sysctl."net.ipv4.ip_forward" = "1";
+    networking = {
+      interfaces = {
+        ${hour.interfaces.primary.link} = {
+          useDHCP = lib.mkForce false;
+          virtual = true;
+          ipv4.addresses = lib.mkForce [
+            {
+              address = hour.interfaces.primary.addr;
+              prefixLength = 32;
+            }
+          ];
+        };
+        eth1.ipv4.routes = lib.pipe nodes [
+          (lib.filter (n: n != node))
+          (map (n: let
+            hour = depot'.config.hours.${n};
+          in {
+            address = hour.interfaces.primary.addrPublic;
+            prefixLength = 32;
+            via = "192.168.1.${toString digits.${n}}";
+          }))
+        ];
+      };
+
+      firewall.extraCommands = lib.mkAfter (lib.optionalString (hour.interfaces.primary.isNat) ''
+        # self-nat
+        iptables -t nat -A PREROUTING -d ${hour.interfaces.primary.addrPublic} -j DNAT --to-destination ${hour.interfaces.primary.addr}
+        iptables -t nat -A POSTROUTING -s ${hour.interfaces.primary.addr} -j SNAT --to-source ${hour.interfaces.primary.addrPublic}
+      '');
+    };
+
+    systemd.services = {
+      hyprspace.enable = false;
+    };
+
+    environment.etc = {
+      "ssh/ssh_host_ed25519_key" = {
+        source = snakeoil.ssh.private;
+        mode = "0400";
+      };
+    };
+    virtualisation = {
+      cores = 2;
+      memorySize = 4096;
+    };
+  });
+}