From 5efdd891dbc54c7d6b83cd009495481efc4aafd7 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Fri, 22 Oct 2021 14:05:42 +0200
Subject: [PATCH] nixos: services: ssh-server: persist host keys

---
 modules/nixos/services/ssh-server/default.nix | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/modules/nixos/services/ssh-server/default.nix b/modules/nixos/services/ssh-server/default.nix
index 9ae0fa8..c4d1fd6 100644
--- a/modules/nixos/services/ssh-server/default.nix
+++ b/modules/nixos/services/ssh-server/default.nix
@@ -20,6 +20,13 @@ in
       };
     };
 
+    # Persist SSH keys
+    my.system.persist.files =
+      let
+        pubAndPrivKey = key: [ key.path "${key.path}.pub" ];
+      in
+      lib.concatMap pubAndPrivKey config.services.openssh.hostKeys;
+
     # Opens the relevant UDP ports.
     programs.mosh.enable = true;
   };