2 files changed, 37 insertions, 0 deletions

diff --git a/modules/machine-id/default.nix b/modules/machine-id/default.nix
new file mode 100644
index 00000000..2c33db26
--- /dev/null
+++ b/modules/machine-id/default.nix
@@ -0,0 +1,36 @@
+{ config, pkgs, lib, hostName, ... }:
+
+with lib;
+
+let
+  cfg = config.system.machine-id.generate;
+
+  generate = pkgs.writers.writePython3 "generate" {} ''
+    from hashlib import blake2s
+    from sys import argv
+    from base64 import b64decode
+
+
+    print(blake2s(
+        argv[2].strip().encode('utf-8'),
+        key=b64decode(argv[1]),
+        person=b'machn-id',
+        digest_size=16,
+    ).hexdigest())
+  '';
+
+  machine-id = trim (builtins.readFile (pkgs.runCommand "machine-id" { inherit hostName; } ''
+    ${generate} "${builtins.readFile ./seed}" "$hostName" > $out
+  ''));
+in {
+  options = {
+    system.machine-id.generate = {
+      enable = mkEnableOption "automatic generation of `/etc/machine-id`" // { default = true; };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    environment.etc."machine-id".text = mkDefault machine-id;
+    networking.hostId = mkDefault (substring 0 8 machine-id);
+  };
+}
diff --git a/modules/machine-id/seed b/modules/machine-id/seed
new file mode 100644
index 00000000..176ce403
--- /dev/null
+++ b/modules/machine-id/seed
@@ -0,0 +1 @@
+ZmOKMn16QBuqIix5RVMCBj11XxQrLCWxcdjs+qBiuRA=