modules: add a module to init mu

hosts/europa/default.nix

@@ -113,6 +113,10 @@ in {
     };
   };
 
+  muInit = {
+    enable = true;
+  };
+
   services = {
     pcscd.enable = true;
     vnstat.enable = true;

hosts/faf/default.nix

@@ -23,7 +23,8 @@ in {
   networking.interfaces.enp1s0.useDHCP = true;
   networking.interfaces.enp2s0.useDHCP = true;
 
-  networking.firewall.allowedTCPPorts = [ 22 53 config.services.prometheus.exporters.node.port ];
+  networking.firewall.allowedTCPPorts =
+    [ 22 53 config.services.prometheus.exporters.node.port ];
   networking.firewall.allowedUDPPorts = [ 53 ];
 
   users.users.root = userBase;

modules/default.nix

@@ -1,2 +1,2 @@
-{ config, lib, pkgs, ... }: with lib; { imports = [ ./ssh-fido-agent.nix ]; }
+{ config, lib, pkgs, ... }: { imports = [ ./ssh-fido-agent.nix ./mu.nix ]; }
 

modules/mu.nix

@@ -1,41 +1,56 @@
 { config, lib, pkgs, ... }:
 let
-  cfg = config.muServer;
+  cfg = config.muInit;
   mu = "${pkgs.mu}/bin/mu";
   muInitScript = pkgs.writeScriptBin "mu-init-script" ''
     #!${pkgs.runtimeShell}
 
     set -eu
 
+    MU_HOME=~/.cache/mu
+
+    if [ "${cfg.muHome}" != "mudefault" ]; then
+      MU_HOME="${cfg.muHome}"
+    fi
+
     while true; do
-      if [ ! -d ${cfg.muHome} ]; then
-        ${mu} init --muhome="${cfg.muHome}" --maildir="${cfg.mailDir}" --my-address="${cfg.emailAddress}"
+      if [ ! -d $MU_HOME ]; then
+        echo "MU home directory missing: $MU_HOME. Creating it."
+        ${mu} init ${
+          if cfg.muHome != "mudefault" then "--muhome=${cfg.muHome}" else ""
+        } ${if cfg.mailDir != "" then "--maildir=${cfg.mailDir}" else ""} ${
+          if cfg.emailAddress != "" then
+            "--my-address=${cfg.emailAddress}"
+          else
+            ""
+        }
       fi
+      sleep 5;
     done
   '';
 in {
   options = with lib; {
-    muServer = {
+    muInit = {
       enable = lib.mkEnableOption "Enable mu server";
       muHome = lib.mkOption {
-        type = types.path;
-        default = "~/.mu";
+        type = types.str;
+        default = "mudefault";
       };
       mailDir = lib.mkOption {
-        type = types.path;
+        type = types.str;
         default = "~/Maildir";
       };
       emailAddress = lib.mkOption {
-        type = types.string;
+        type = types.str;
         default = "";
       };
     };
   };
 
-  config = lib.mkIf config.muServer.enable {
+  config = lib.mkIf config.muInit.enable {
     environment.systemPackages = [ muInitScript ];
-    systemd.user.services.mu-server = {
-      script = "${muInitScript}";
+    systemd.user.services.mu-init = {
+      script = "${muInitScript}/bin/mu-init-script";
       wantedBy = [ "graphical-session.target" ];
       partOf = [ "graphical-session.target" ];
       after = [ "graphical-session.target" ];