modules: add unlock-luks-on-boot

modules/unlock-luks-on-boot/default.nix

@@ -0,0 +1,20 @@
+{ flake, config, ... }:
+{
+  boot.initrd.network = {
+    enable = true;
+    ssh = {
+      enable = true;
+      # To prevent ssh clients from freaking out because a different host key is used,
+      # a different port for ssh is useful (assuming the same host has also a regular sshd running)
+      port = 2222;
+
+      # Please create this manually the first time.
+      hostKeys = [ "/etc/secrets/initrd/ssh_host_ed25519_key" ];
+      authorizedKeys = config.pub-solar-os.authentication.sshPubKeys;
+    };
+    postCommands = ''
+      # Automatically ask for the password on SSH login
+      echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' >> /root/.profile
+    '';
+  };
+}