networkmanager: Allow NetworkManager and wireless together

When NetworkManager is configured to not manage all interfaces, it's
perfectly fine to have the rest be managed by the standard nixos
wireless scripts.

I use
  networking.networkmanager.unmanaged = [
    "*" "except:type:wwan" "except:type:gsm"
  ];
to control everything using networking.wireless except for the mobile
LTE modem which only works with NetworkManager.

1 files changed, 16 insertions, 11 deletions

diff --git a/nixos/modules/services/networking/networkmanager.nix b/nixos/modules/services/networking/networkmanager.nix
index 551636a33d2..a0c0d6c4b5f 100644
--- a/nixos/modules/services/networking/networkmanager.nix
+++ b/nixos/modules/services/networking/networkmanager.nix
@@ -8,6 +8,8 @@ let
   dynamicHostsEnabled =
     cfg.dynamicHosts.enable && cfg.dynamicHosts.hostsDirs != {};
 
+  delegateWireless = config.networking.wireless.enable == true && cfg.unmanaged != [];
+
   # /var/lib/misc is for dnsmasq.leases.
   stateDirs = "/var/lib/NetworkManager /var/lib/dhclient /var/lib/misc";
 
@@ -177,10 +179,11 @@ in {
       basePackages = mkOption {
         type = types.attrsOf types.package;
         default = { inherit (pkgs)
-                            networkmanager modemmanager wpa_supplicant crda
+                            networkmanager modemmanager crda
                             networkmanager-openvpn networkmanager-vpnc
                             networkmanager-openconnect networkmanager-fortisslvpn
-                            networkmanager-l2tp networkmanager-iodine; };
+                            networkmanager-l2tp networkmanager-iodine; }
+                  // optionalAttrs (!delegateWireless) { inherit (pkgs) wpa_supplicant; };
         internal = true;
       };
 
@@ -377,8 +380,11 @@ in {
   config = mkIf cfg.enable {
 
     assertions = [
-      { assertion = config.networking.wireless.enable == false;
-        message = "You can not use networking.networkmanager with networking.wireless";
+      { assertion = config.networking.wireless.enable == true -> cfg.unmanaged != [];
+        message = ''
+          You can not use networking.networkmanager with networking.wireless.
+          Except if you mark some interfaces as <literal>unmanaged</literal> by NetworkManager.
+        '';
       }
       { assertion = !dynamicHostsEnabled || (dynamicHostsEnabled && cfg.dns == "dnsmasq");
         message = ''
@@ -491,18 +497,17 @@ in {
       path = [ pkgs.iproute pkgs.utillinux pkgs.coreutils ];
     };
 
-    # Turn off NixOS' network management
-    networking = {
+    # Turn off NixOS' network management when networking is managed entirely by NetworkManager
+    networking = (mkIf (!delegateWireless) {
       useDHCP = false;
-      # use mkDefault to trigger the assertion about the conflict above
+      # Use mkDefault to trigger the assertion about the conflict above
       wireless.enable = mkDefault false;
-    };
+    }) // (mkIf cfg.enableStrongSwan {
+      networkmanager.packages = [ pkgs.networkmanager_strongswan ];
+    });
 
     security.polkit.extraConfig = polkitConf;
 
-    networking.networkmanager.packages =
-      mkIf cfg.enableStrongSwan [ pkgs.networkmanager_strongswan ];
-
     services.dbus.packages =
       optional cfg.enableStrongSwan pkgs.strongswanNM ++ cfg.packages;