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l hilum.r: introduce tryFile

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lassulus 2023-01-26 23:47:07 +01:00
parent 34360eb931
commit d0b3d234e5
1 changed files with 9 additions and 2 deletions
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11
lass/1systems/hilum/physical.nix
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@ -6,9 +6,16 @@
<nixpkgs/nixos/modules/installer/scan/not-detected.nix>
{
# nice hack to carry around state passed impurely at the beginning
options.mainDisk = lib.mkOption {
options.mainDisk = let
tryFile = path: default:
if lib.elem (builtins.baseNameOf path) (lib.attrNames (builtins.readDir (builtins.dirOf path))) then
builtins.readFile path
else
default
;
in lib.mkOption {
type = lib.types.str;
default = builtins.readFile "/etc/hilum-disk";
default = tryFile "/etc/hilum-disk" "/dev/sdz";
};
config.environment.etc.hilum-disk.text = config.mainDisk;
}