Add a role for mitmproxy.

This is to pull in the drivers for the mt7927 wireless chipset in my desktop. Normally, I would keep the rest of my machines on LTS but since Linux 7 significantly changed the kernel preemption, maintaining two configs would be more trouble than it is worth.

nix/configuration/configuration.nix

@@ -64,6 +64,7 @@ in
     ./roles/media
     ./roles/memtest86
     ./roles/minimal_base
+    ./roles/mitmproxy
     ./roles/network
     ./roles/nix_index
     ./roles/nix_repl

nix/configuration/hosts/odo/default.nix

@@ -118,6 +118,7 @@
     me.lvfs.enable = true;
     me.media.enable = true;
     me.memtest.enable = true;
+    me.mitmproxy.enable = true;
     me.network.enable = true;
     me.nix_index.enable = true;
     me.nix_repl.enable = true;

nix/configuration/hosts/quark/default.nix

@@ -111,6 +111,7 @@
     me.lvfs.enable = true;
     me.media.enable = true;
     me.memtest.enable = true;
+    me.mitmproxy.enable = true;
     me.network.enable = true;
     me.nix_index.enable = true;
     me.nix_repl.enable = true;

nix/configuration/roles/kernel/default.nix

@@ -14,30 +14,12 @@ let
     full = {
       PREEMPT_DYNAMIC = yes;
       PREEMPT = yes;
-      PREEMPT_VOLUNTARY = lib.mkForce no;
       PREEMPT_LAZY = lib.mkForce no;
-      PREEMPT_NONE = no;
     };
     lazy = {
       PREEMPT_DYNAMIC = yes;
       PREEMPT = no;
-      PREEMPT_VOLUNTARY = lib.mkForce no;
       PREEMPT_LAZY = yes;
-      PREEMPT_NONE = no;
-    };
-    voluntary = {
-      PREEMPT_DYNAMIC = no;
-      PREEMPT = no;
-      PREEMPT_VOLUNTARY = yes;
-      PREEMPT_LAZY = lib.mkForce no;
-      PREEMPT_NONE = no;
-    };
-    none = {
-      PREEMPT_DYNAMIC = no;
-      PREEMPT = no;
-      PREEMPT_VOLUNTARY = lib.mkForce no;
-      PREEMPT_LAZY = lib.mkForce no;
-      PREEMPT_NONE = yes;
     };
   };
   tick_hz =
@@ -99,16 +81,14 @@ let
       TRANSPARENT_HUGEPAGE_MADVISE = yes;
     };
   };
-  common_config =
-    with lib.kernel;
-    {
+  common_config = with lib.kernel; {
     # Google's BBRv3 TCP congestion Control
     TCP_CONG_BBR = yes;
     DEFAULT_BBR = yes;
   };
   flavors = {
     server = lib.mkMerge [
-      preemption_type.none
+      preemption_type.lazy
       tick_hz."300"
       performance_governor.default
       tick_rate.tickless
@@ -142,7 +122,8 @@ in
 
     kernel.version = lib.mkOption {
       type = lib.types.str;
-      default = "linux"; # LTS
+      # default = "linux"; # LTS
+      default = "linux_7_2"; # LTS
       example = "linux_6_18";
       description = "What version of the kernl should we use.";
     };

nix/configuration/roles/mitmproxy/default.nix

@@ -0,0 +1,25 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  options.me = {
+    mitmproxy.enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      example = true;
+      description = "Whether we want to install mitmproxy.";
+    };
+  };
+
+  config = lib.mkIf config.me.mitmproxy.enable {
+    environment.systemPackages = with pkgs; [
+      mitmproxy
+    ];
+  };
+}