41 lines
1.2 KiB
Nix
41 lines
1.2 KiB
Nix
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# This module extends the official sd-image.nix with the following:
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# - ability to add options to the config.txt firmware
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{
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config,
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lib,
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pkgs,
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...
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}: {
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options.sdImage = with lib; {
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extraFirmwareConfig = mkOption {
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type = types.attrs;
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default = {};
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description = lib.mdDoc ''
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Extra configuration to be added to config.txt.
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'';
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};
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};
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config = {
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sdImage.populateFirmwareCommands =
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lib.mkIf ((lib.length (lib.attrValues config.sdImage.extraFirmwareConfig)) > 0)
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(
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let
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# Convert the set into a string of lines of "key=value" pairs.
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keyValueMap = name: value: name + "=" + toString value;
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keyValueList = lib.mapAttrsToList keyValueMap config.sdImage.extraFirmwareConfig;
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extraFirmwareConfigString = lib.concatStringsSep "\n" keyValueList;
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in
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lib.mkAfter
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''
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config=firmware/config.txt
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# The initial file has just been created without write permissions. Add them to be able to append the file.
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chmod u+w $config
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echo "\n# Extra configuration" >> $config
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echo "${extraFirmwareConfigString}" >> $config
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chmod u-w $config
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''
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);
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};
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}
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