137 lines
3.7 KiB
Nix
137 lines
3.7 KiB
Nix
{ lib, config, ... }:
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with lib;
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let
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findWinner = candidates: winner:
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any (x: x == winner) candidates;
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# winners is an ordered list where first item wins over 2nd etc
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mergeAnswer = winners: locs: defs:
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let
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values = map (x: x.value) defs;
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inter = intersectLists values winners;
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winner = head winners;
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in
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if defs == [] then abort "This case should never happen."
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else if winner == [] then abort "Give a valid list of winner"
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else if inter == [] then mergeOneOption locs defs
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else if findWinner values winner then
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winner
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else
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mergeAnswer (tail winners) locs defs;
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mergeFalseByDefault = locs: defs:
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if defs == [] then abort "This case should never happen."
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else if any (x: x == false) defs then false
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else true;
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kernelItem = types.submodule {
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options = {
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tristate = mkOption {
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type = types.enum [ "y" "m" "n" null ] // {
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merge = mergeAnswer [ "y" "m" "n" ];
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};
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default = null;
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internal = true;
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visible = true;
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description = ''
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Use this field for tristate kernel options expecting a "y" or "m" or "n".
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'';
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};
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freeform = mkOption {
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type = types.nullOr types.str // {
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merge = mergeEqualOption;
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};
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default = null;
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example = ''MMC_BLOCK_MINORS.freeform = "32";'';
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description = ''
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Freeform description of a kernel configuration item value.
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'';
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};
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optional = mkOption {
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type = types.bool // { merge = mergeFalseByDefault; };
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default = false;
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description = ''
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Wether option should generate a failure when unused.
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'';
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};
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};
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};
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mkValue = with lib; val:
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let
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isNumber = c: elem c ["0" "1" "2" "3" "4" "5" "6" "7" "8" "9"];
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in
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if (val == "") then "\"\""
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else if val == "y" || val == "m" || val == "n" then val
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else if all isNumber (stringToCharacters val) then val
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else if substring 0 2 val == "0x" then val
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else val; # FIXME: fix quoting one day
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# generate nix intermediate kernel config file of the form
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#
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# VIRTIO_MMIO m
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# VIRTIO_BLK y
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# VIRTIO_CONSOLE n
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# NET_9P_VIRTIO? y
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#
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# Borrowed from copumpkin https://github.com/NixOS/nixpkgs/pull/12158
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# returns a string, expr should be an attribute set
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# Use mkValuePreprocess to preprocess option values, aka mark 'modules' as 'yes' or vice-versa
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# use the identity if you don't want to override the configured values
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generateNixKConf = exprs:
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let
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mkConfigLine = key: item:
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let
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val = if item.freeform != null then item.freeform else item.tristate;
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in
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if val == null
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then ""
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else if (item.optional)
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then "${key}? ${mkValue val}\n"
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else "${key} ${mkValue val}\n";
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mkConf = cfg: concatStrings (mapAttrsToList mkConfigLine cfg);
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in mkConf exprs;
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in
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{
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options = {
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intermediateNixConfig = mkOption {
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readOnly = true;
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type = types.lines;
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example = ''
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USB? y
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DEBUG n
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'';
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description = ''
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The result of converting the structured kernel configuration in settings
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to an intermediate string that can be parsed by generate-config.pl to
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answer the kernel `make defconfig`.
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'';
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};
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settings = mkOption {
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type = types.attrsOf kernelItem;
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example = literalExample '' with lib.kernel; {
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"9P_NET" = yes;
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USB = optional yes;
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MMC_BLOCK_MINORS = freeform "32";
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}'';
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description = ''
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Structured kernel configuration.
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'';
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};
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};
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config = {
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intermediateNixConfig = generateNixKConf config.settings;
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};
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}
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