liminix

base.nix (5700B)

---

 ## Base options
 ## ============
 
 {
   lib,
   pkgs,
   config,
   ...
 }:
 let
   inherit (lib) mkOption types;
   inherit (pkgs.pseudofile) dir symlink;
 
   type_service = pkgs.liminix.lib.types.service;
 
 in
 {
   options = {
     defaultProfile = {
       packages = mkOption {
         type = types.listOf types.package;
         description = ''
           List of packages which are available in a login shell. (This
           is analogous to systemPackages in NixOS, but we don't symlink into
           /run/current-system, we just add the paths in /etc/profile
         '';
       };
     };
     services = mkOption {
       type = types.attrsOf type_service;
     };
     system.callService = mkOption {
       type = types.functionTo (types.functionTo types.anything);
     };
 
     filesystem = mkOption {
       type = types.anything;
       description = ''
         Skeleton filesystem, represented as nested attrset. Consult the
         source code if you need to add to this
       '';
       # internal = true;  # probably a good case to make this internal
     };
     rootfsType = mkOption {
       default = "squashfs";
       type = types.enum [
         "btrfs"
         "ext4"
         "jffs2"
         "squashfs"
         "ubifs"
       ];
     };
     rootOptions = mkOption {
       type = types.nullOr types.str;
       default = null;
     };
 
     boot = {
       commandLine = mkOption {
         type = types.listOf types.nonEmptyStr;
         default = [ ];
         description = "Kernel command line";
       };
       commandLineDtbNode = mkOption {
         type = types.enum [
           "bootargs"
           "bootargs-override"
         ];
         default = "bootargs";
         description = "Kernel command line's devicetree node";
       };
       imageType = mkOption {
         type = types.enum [
           "primary"
           "secondary"
         ];
         default = "primary";
       };
       imageFormat = mkOption {
         type = types.enum [
           "fit"
           "uimage"
         ];
         default = "uimage";
       };
       tftp = {
         loadAddress = mkOption {
           type = types.ints.unsigned;
           description = ''
             RAM address at which to load data when transferring via
             TFTP. This is not the address of the flash storage,
             nor the kernel load address: it should be set to some part
             of RAM that's not used for anything else and suitable for
             temporary storage.
           '';
         };
         # These names match the uboot environment variables. I reserve
         # the right to change them if I think of better ones.
         ipaddr = mkOption {
           type = types.str;
           description = ''
             Our IP address to use when creating scripts to
             boot or flash from U-Boot. Not relevant in normal operation
           '';
         };
         serverip = mkOption {
           type = types.str;
           description = ''
             IP address of the TFTP server.  Not relevant in normal operation
           '';
         };
       };
     };
   };
   config = {
     defaultProfile.packages = with pkgs; [
       s6
       s6-init-bin
       execline
       s6-linux-init
       s6-rc
     ];
 
     boot.commandLine = [
       "panic=10 oops=panic init=/bin/init loglevel=8"
       "root=${config.hardware.rootDevice}"
       "rootfstype=${config.rootfsType}"
       "fw_devlink=off"
     ] ++ lib.optional (config.rootOptions != null) "rootflags=${config.rootOptions}";
 
     system.callService =
       path: parameters:
       let
         typeChecked =
           caller: type: value:
           let
             inherit (lib) types mergeDefinitions;
             defs = [
               {
                 file = caller;
                 inherit value;
               }
             ];
             type' = types.submodule { options = type; };
           in
           (mergeDefinitions [ ] type' defs).mergedValue;
         cp = lib.callPackageWith (pkgs // { svc = config.system.service; });
         pkg = cp path { };
         checkTypes = t: p: typeChecked (builtins.toString path) t p;
       in
       {
         inherit parameters;
         build =
           {
             dependencies ? [ ],
             ...
           }@args:
           let
             s = pkg (checkTypes parameters (builtins.removeAttrs args [ "dependencies" ]));
           in
           s.overrideAttrs (o: {
             dependencies = dependencies ++ o.dependencies;
             buildInputs = dependencies ++ o.buildInputs;
           });
       };
 
     users.root = {
       uid = 0;
       gid = 0;
       gecos = "Root of all evaluation";
       dir = "/home/root/";
       passwd = lib.mkDefault "";
       shell = "/bin/sh";
     };
     groups = {
       root = {
         gid = 0;
         usernames = [ "root" ];
       };
       system = {
         gid = 1;
         usernames = [ "root" ];
       };
     };
 
     filesystem = dir {
       dev =
         let
           node = type: major: minor: mode: {
             inherit
               type
               major
               minor
               mode
               ;
           };
         in
         dir {
           null = node "c" "1" "3" "0666";
           zero = node "c" "1" "5" "0666";
           tty = node "c" "5" "0" "0666";
           console = node "c" "5" "1" "0600";
           pts = dir { };
         };
       etc =
         let
           profile = symlink (
             pkgs.writeScript ".profile" ''
               PATH=${lib.makeBinPath config.defaultProfile.packages}:/bin
                export PATH
             ''
           );
         in
         dir {
           inherit profile;
           ashrc = profile;
         };
 
       proc = dir { };
       run = dir { };
       sys = dir { };
       tmp = dir { };
     };
   };
 }