clanModule: Init wifi iwd clan module, with which you can predefine wifi network credentials

clanModules/iwd/README.md

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+---
+description = "Automatically provisions wifi credentials"
+---
+
+
+!!! Warning
+    This module is for demo purposes only right now the password is not encrypted and world readable!
+
+
+

clanModules/iwd/default.nix

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+{ lib, config, ... }:
+
+let
+  cfg = config.clan.iwd;
+  secret_path = ssid: config.clan.core.facts.services."iwd.${ssid}".secret."wifi-password".path or "";
+  secret_generator = name: value: {
+    name = "iwd.${value.ssid}";
+    value = {
+      secret."iwd.${value.ssid}" = { };
+      generator.prompt = "Wifi password for '${value.ssid}'";
+      generator.script = ''
+        config="
+        [Security]
+          Passphrase=$prompt_value
+        "
+        echo "$config" > $secrets/wifi-password
+      '';
+    };
+  };
+in
+{
+  options.clan.iwd = {
+    networks = lib.mkOption {
+      type = lib.types.attrsOf (
+        lib.types.submodule (
+          { name, ... }:
+          {
+            options = {
+              ssid = lib.mkOption {
+                type = lib.types.strMatching "^[a-zA-Z0-9._-]+$";
+                default = name;
+                description = "The name of the wifi network";
+              };
+            };
+          }
+        )
+      );
+      default = { };
+      description = "Wifi networks to predefine";
+    };
+  };
+
+  imports = [
+    (lib.mkRemovedOptionModule [
+      "clan"
+      "iwd"
+      "enable"
+    ] "Just define clan.iwd.networks to enable it")
+  ];
+
+  config = lib.mkMerge [
+    (lib.mkIf (cfg.networks != { }) {
+      # Systemd tmpfiles rule to create /var/lib/iwd/example.psk file
+      systemd.tmpfiles.rules = lib.mapAttrsToList (
+        _: value: "C /var/lib/iwd/${value.ssid}.psk 0600 root root - ${secret_path value.ssid}"
+      ) cfg.networks;
+
+      clan.core.facts.services = lib.mapAttrs' secret_generator cfg.networks;
+    })
+    {
+      # disable wpa supplicant
+      networking.wireless.enable = false;
+
+      # Use iwd instead of wpa_supplicant. It has a user friendly CLI
+      networking.wireless.iwd = {
+        enable = true;
+        settings = {
+          Network = {
+            EnableIPv6 = true;
+            RoutePriorityOffset = 300;
+          };
+          Settings.AutoConnect = true;
+        };
+      };
+    }
+  ];
+}