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types gpt: hash label if it's > 36 characters

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lassulus 2024-03-04 01:50:21 +01:00
parent 3cb3775f9b
commit 56f6d3d4af
1 changed files with 9 additions and 1 deletions
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10
lib/types/gpt.nix
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@ -55,7 +55,15 @@ in
};
label = lib.mkOption {
type = lib.types.str;
default = "${config._parent.type}-${config._parent.name}-${partition.config.name}";
default = let
# 72 bytes is the maximum length of a GPT partition name
# the labels seem to be in UTF-16, so 2 bytes per character
limit = 36;
label = "${config._parent.type}-${config._parent.name}-${partition.config.name}";
in if (lib.stringLength label) > limit then
builtins.substring 0 limit (builtins.hashString "sha256" label)
else
label;
};
size = lib.mkOption {
type = lib.types.either (lib.types.enum [ "100%" ]) (lib.types.strMatching "[0-9]+[KMGTP]?");