moby: try shipping the armbian kernel with (close to) the pmOS defconfig

it builds, but the camera is just as broken as w/o pmOS config

hosts/modules/hal/pine64/kernel.nix

@@ -32,7 +32,10 @@ in
     # boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-manjaro;
     # boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_latest;
     # boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux_testing;
-    boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-armbian;
+    # boot.kernelPackages = pkgs.linuxPackagesFor pkgs.linux-armbian;
+    boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux-armbian.override {
+      usePmosConfig = true;
+    });
 
     # nixpkgs.hostPlatform.linux-kernel becomes stdenv.hostPlatform.linux-kernel
     # ^ but only if using flakes (or rather, if *not* using `nixpkgs.nixos` to construct the host config)

pkgs/additional/linux-armbian/default.nix

@@ -4,20 +4,21 @@
   lib,
   buildLinux,
   linux_latest,
+  linux-postmarketos-allwinner,
   newScope,
+  sane-kernel-tools,
+  usePmosConfig ? false,
   #VVV nixpkgs calls `.override` on the kernel to configure additional things, but we don't care about those things
-  features ? {},
-  kernelPatches ? null,
-  randstructSeed ? "",
-  structuredExtraConfig ? {},
-}:
+  ...
+}@args:
 let
   linux = linux_latest;
   patches = import ./patches.nix { inherit fetchFromGitHub lib newScope; };
 in
-buildLinux {
-  inherit (linux_latest) src version modDirVersion;
-  inherit features randstructSeed structuredExtraConfig;
+# buildLinux {
+linux_latest.override {
+  # inherit (linux_latest) src version modDirVersion;
+  # inherit features randstructSeed structuredExtraConfig;
 
   DTB = true;  #< XXX: not sure if actually needed
   autoModules = true;
@@ -358,6 +359,56 @@ buildLinux {
         RAID6_PQ_BENCHMARK = no;
       };
     }
+  ] ++ lib.optionals usePmosConfig [
+    {
+      name = "postmarketos-config";
+      patch = null;
+      extraStructuredConfig = builtins.removeAttrs
+        (sane-kernel-tools.parseDefconfigStructuredNonempty linux-postmarketos-allwinner.defconfigStr)
+        [
+          # remove attrs which nixpkgs wants to set for itself, only because the kernel config options are so fucked that i can't figure out how to override things without breaking eval
+          "BINFMT_MISC"
+          "DEFAULT_MMAP_MIN_ADDR"
+          "IP_NF_TARGET_REDIRECT"
+          "IP_PNP"
+          "LOGO"
+          "NLS_CODEPAGE_437"
+          "NLS_DEFAULT"
+          "NLS_ISO8859_1"
+          "NR_CPUS"
+          "PREEMPT"
+          "RAID6_PQ_BENCHMARK"
+          "STANDALONE"
+          "TRANSPARENT_HUGEPAGE_ALWAYS"
+          "UEVENT_HELPER"
+          "USB_SERIAL"
+          "ZSMALLOC"
+
+          # these options have changed since the version which pmos ships? or pmos just ships invalid values
+          "BASE_SMALL"
+          # "repeated questions"
+          "NETFILTER_XT_TARGET_TPROXY"
+          "NETFILTER_XT_MATCH_HASHLIMIT"
+          "NETFILTER_XT_MATCH_SOCKET"
+          "IP_NF_MATCH_RPFILTER"
+          "CFG80211"
+          "MAC80211"
+          "DRM_SUN4I"
+          "DRM_SUN6I_DSI"
+          "DRM_SUN8I_DW_HDMI"
+          "DRM_SUN8I_MIXER"
+          "DRM_PANEL_FEIXIN_K101_IM2BA02"
+          "DRM_PANEL_FEIYANG_FY07024DI26A30D"
+          "DRM_PANEL_ILITEK_ILI9881C"
+          "DRM_PANEL_SITRONIX_ST7703"
+          "DRM_PANEL_SIMPLE"
+          "DRM_LIMA"
+          "DRM_PANFROST"
+          "BLK_DEV_DM"
+          "VFIO"
+        ]
+      ;
+    }
   ];
 
   passthru = {

pkgs/additional/linux-postmarketos-allwinner/default.nix

@@ -64,7 +64,7 @@ let
     CONFIG_MODEM_POWER=y
   '';
 
-in linuxManualConfig {
+in (linuxManualConfig {
   inherit src version modDirVersion randstructSeed;
   # inherit (linux-megous) extraMakeFlags modDirVersion src version;
   # inherit (linux-megous) kernelPatches;
@@ -99,4 +99,8 @@ in linuxManualConfig {
       patch = linux-megous.passthruPatches.af8133j;
     }
   ];
-}
+}).overrideAttrs (base: {
+  passthru = (base.passthru or {}) // {
+    inherit defconfigStr;
+  };
+})

pkgs/additional/sane-kernel-tools/default.nix

@@ -1,7 +1,10 @@
-{ lib
-, newScope
+{
+  lib,
+  newScope,
 }:
 lib.makeScope newScope (self: with self; {
+  # maps `CONFIG_FOO=y` to `[ { CONFIG_FOO = "y"; }]`
+  # maps `# CONFIG_FOO is not set` to `[]`
   parseDefconfigLine = line: let
     pieces = lib.splitString "=" line;
   in
@@ -16,11 +19,33 @@ lib.makeScope newScope (self: with self; {
       value = lib.concatStringsSep "=" (lib.tail pieces);
     }]
   ;
+
   # parseDefconfig: given the entire text of a defconfig file
   # parse it into an attrset usable by the nixpkgs kernel config tools.
+  # this is not meant for `extraStructuredConfig`, but stuff further downstream.
+  # results are like ` { CONFIG_FOO = "y"; CONFIG_FOO_BAR = "128"; }`
   parseDefconfig = wholeStr: let
     lines = lib.splitString "\n" wholeStr;
     parsedItems = lib.concatMap parseDefconfigLine lines;
   in
     lib.listToAttrs parsedItems;
+
+  parseDefconfigStructured = wholeStr: let
+    asKV = parseDefconfig wholeStr;
+  in lib.mapAttrs' (k: v: {
+    name = lib.removePrefix "CONFIG_" k;
+    value = with lib.kernel;
+      if v == "y" then yes
+      else if v == "n" then no
+      else if v == "m" then module
+      else if lib.hasPrefix ''"'' v && lib.hasSuffix ''"'' v then freeform (builtins.fromJSON v)
+      else freeform v
+    ;
+  }) asKV;
+
+  # configs like `CONFIG_LOCALVERSION=""`, transformed into `LOCALVERSION = freeform ""`,
+  # can confuse the kernel build process. remove those empty strings.
+  parseDefconfigStructuredNonempty = wholeStr: let
+    asAttrs = parseDefconfigStructured wholeStr;
+  in lib.filterAttrs (k: v: v != lib.kernel.freeform "") asAttrs;
 })