Merge pull request #210205 from 9ary/kernel-fonts

Build the large Terminus font into the kernel

nixos/modules/config/console.nix

···
   # Sadly, systemd-vconsole-setup doesn't support binary keymaps.
   vconsoleConf = pkgs.writeText "vconsole.conf" ''
     KEYMAP=${cfg.keyMap}
-    FONT=${cfg.font}
+    ${optionalString (cfg.font != null) "FONT=${cfg.font}"}
   '';
 
   consoleEnv = kbd: pkgs.buildEnv {
···
     };
 
     font = mkOption {
-      type = with types; either str path;
+      type = with types; nullOr (either str path);
       default = "Lat2-Terminus16";
       example = "LatArCyrHeb-16";
       description = mdDoc ''
···
         whatever the {command}`setfont` program considers the
         default font.
         Can be either a font name or a path to a PSF font file.
+
+        Use `null` to let the kernel choose a built-in font.
+        The default is 8x16, and, as of Linux 5.3, Terminus 32 bold for display
+        resolutions of 2560x1080 and higher.
+        These fonts cover the [IBM437][] character set.
+
+        [IBM437]: https://en.wikipedia.org/wiki/Code_page_437
       '';
     };
 
···
           printf "\033%%${if isUnicode then "G" else "@"}" >> /dev/console
           loadkmap < ${optimizedKeymap}
 
-          ${optionalString cfg.earlySetup ''
+          ${optionalString (cfg.earlySetup && cfg.font != null) ''
             setfont -C /dev/console $extraUtils/share/consolefonts/font.psf
           ''}
         '');
···
           "${config.boot.initrd.systemd.package.kbd}/bin/setfont"
           "${config.boot.initrd.systemd.package.kbd}/bin/loadkeys"
           "${config.boot.initrd.systemd.package.kbd.gzip}/bin/gzip" # Fonts and keyboard layouts are compressed
-        ] ++ optionals (hasPrefix builtins.storeDir cfg.font) [
+        ] ++ optionals (cfg.font != null && hasPrefix builtins.storeDir cfg.font) [
           "${cfg.font}"
         ] ++ optionals (hasPrefix builtins.storeDir cfg.keyMap) [
           "${cfg.keyMap}"
···
         ];
       })
 
-      (mkIf (cfg.earlySetup && !config.boot.initrd.systemd.enable) {
+      (mkIf (cfg.earlySetup && cfg.font != null && !config.boot.initrd.systemd.enable) {
         boot.initrd.extraUtilsCommands = ''
           mkdir -p $out/share/consolefonts
           ${if substring 0 1 cfg.font == "/" then ''

pkgs/os-specific/linux/kernel/common-config.nix

···
       DRM_SIMPLEDRM = whenAtLeast "5.14" no;
     };
 
+    fonts = {
+      FONTS = yes;
+      # Default fonts enabled if FONTS is not set
+      FONT_8x8 = yes;
+      FONT_8x16 = yes;
+      # High DPI font
+      FONT_TER16x32 = whenAtLeast "5.0" yes;
+    };
+
     video = {
       DRM_LEGACY = no;
       NOUVEAU_LEGACY_CTX_SUPPORT = whenBetween "5.2" "6.3" no;