factorize os configurations

os/remote-disk-unlock.nix

@@ -0,0 +1,27 @@
+sshKeys: ({ config, pkgs, ... }: {
+  boot.kernelParams = [ "ip=dhcp" ];
+  boot = {
+    initrd = {
+      availableKernelModules = [ "r8169" ];
+      network = {
+        enable = true;
+        udhcpc = {
+          enable = true;
+          extraArgs = [ "--background" "--retries" "1" ];
+        };
+        flushBeforeStage2 = true;
+        ssh = {
+          enable = true;
+          port = 22;
+          authorizedKeys = sshKeys;
+          hostKeys = [ "/etc/ssh/ssh_host_ed25519_key" ];
+          # shell = "/bin/cryptsetup-askpass";
+        };
+        postCommands = ''
+          # Automatically ask for the password on SSH login
+          echo 'cryptsetup-askpass || echo "Unlock was successful; exiting SSH session" && exit 1' >> /root/.profile
+        '';
+      };
+    };
+  };
+})