fix

modules/home/ssh.nix

@@ -3,25 +3,37 @@
 
   home.packages = [ pkgs.openssh ];
 
+  programs.ssh.startAgent = true;
+
   home.activation.generateSshKey = lib.hm.dag.entryAfter [ "writeBoundary" ] ''
     key="$HOME/.ssh/id_ed25519"
     if [ ! -f "$key" ]; then
       umask 077
       mkdir -p "$HOME/.ssh"
-      ssh-keygen -t ed25519 -N "" -f "$key" \
-        -C "${config.home.username}@$(hostnamectl --static)"
+      ssh-keygen -t ed25519 -N "" -f "$key" -C "${config.home.username}@$(hostnamectl --static 2>/dev/null || echo host)"
       echo "Generated SSH key at $key"
-      echo "Public key:"
-      cat "$key.pub"
     fi
   '';
 
-  services.ssh-agent.enable = true;
-  programs.gpg.enable = true;
+  home.file.".ssh/config".text = ''
+    Host *
+      AddKeysToAgent yes
+      IdentityFile ~/.ssh/id_ed25519
+  '';
 
-
-  services.gpg-agent = {
+  programs.git = {
     enable = true;
-    enableSshSupport = true;
+
+    signing = {
+      gpgFormat = "ssh";
+      key = "~/.ssh/id_ed25519.pub";
+      signByDefault = true;
+    };
+
+    extraConfig = {
+      gpg.format = "ssh";
+      commit.gpgsign = true;
+      tag.gpgSign = true;
+    };
   };
 }