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ff9999ad1b
Instead of using a string to describe kernel config, use a nix attribute set, then converted to a string. - allows to override the config, aka convert 'yes' into 'modules' or vice-versa - while for now merging different configs is still crude (last spec wins), at least there should be only one CONFIG_XYZ value compared to the current string config where the first defined would be used and others ignored. [initial idea by copumpkin in 2016, a major rebase to 2018 by teto]
57 lines
1.8 KiB
Nix
57 lines
1.8 KiB
Nix
{ lib
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# we pass the kernel version here to keep a nice syntax `whenOlder "4.13"`
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# kernelVersion, e.g., config.boot.kernelPackages.version
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, version
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, mkValuePreprocess ? null
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}:
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with lib;
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rec {
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# Common patterns
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when = cond: opt: if cond then opt else null;
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whenAtLeast = ver: when (versionAtLeast version ver);
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whenOlder = ver: when (versionOlder version ver);
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whenBetween = verLow: verHigh: when (versionAtLeast version verLow && versionOlder version verHigh);
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# Keeping these around in case we decide to change this horrible implementation :)
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option = x: if x == null then null else "?${x}";
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yes = "y";
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no = "n";
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module = "m";
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mkValue = 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 == yes || val == module || val == no 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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# Use mkValuePreprocess to preprocess option values, aka mark 'modules' as
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# 'yes' or vice-versa
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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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generateNixKConf = exprs: mkValuePreprocess:
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let
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mkConfigLine = key: rawval:
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let
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val = if builtins.isFunction mkValuePreprocess then mkValuePreprocess rawval else rawval;
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in
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if val == null
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then ""
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else if hasPrefix "?" val
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then "${key}? ${mkValue (removePrefix "?" val)}\n"
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else "${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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}
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