1 files changed, 40 insertions, 0 deletions
diff --git a/nixos/modules/autounlock.nix b/nixos/modules/autounlock.nix
new file mode 100644
index 0000000..2e40bb2
--- /dev/null
+++ b/nixos/modules/autounlock.nix
@@ -0,0 +1,40 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cnf = config.cynerd.autounlock;
+
+in {
+
+  options = {
+    cynerd.autounlock = mkOption {
+      type = with types; attrsOf string;
+      default = {};
+      description = "Devices to be auto-unlocked.";
+    };
+  };
+
+  config = mkIf (cnf != {}) {
+
+    environment.systemPackages = [ pkgs.luks-hw-password ];
+    boot.initrd = {
+      extraFiles."/bin/luks-password" = pkgs.luks-hw-password + "/bin/luks-hw-password";
+      luks.devices = mapAttrs (name: value: {
+          device = value;
+          keyFile = "/keys/${name}.key";
+          fallbackToPassword = true;
+          preOpenCommands = ''
+            mkdir -p /keys
+            luks-hw-password > /keys/${name}.key
+            '';
+          postOpenCommands = ''
+            rm -rf /keys
+            '';
+        }) cnf;
+    };
+
+  };
+
+}