2020-07-22 09:29:59 +00:00
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tree:
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let
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op = sum: path: val:
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let
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2020-07-22 09:35:14 +00:00
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pathStr = builtins.concatStringsSep "/" path;
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2020-07-22 09:29:59 +00:00
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in
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if (builtins.typeOf val) != "set" then
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# ignore that value
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# builtins.trace "${pathStr} is not of type set"
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sum
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else if val ? type && val.type == "derivation" then
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# builtins.trace "${pathStr} is a derivation"
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# we used to use the derivation outPath as the key, but that crashes Nix
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# so fallback on constructing a static key
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(sum // {
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"${pathStr}" = val;
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})
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else if val ? recurseForDerivations && val.recurseForDerivations == true then
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# builtins.trace "${pathStr} is a recursive"
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# recurse into that attribute set
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(recurse sum path val)
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else
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# ignore that value
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# builtins.trace "${pathStr} is something else"
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sum
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;
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recurse = sum: path: val:
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builtins.foldl'
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(sum: key: op sum (path ++ [ key ]) val.${key})
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sum
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(builtins.attrNames val)
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;
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in
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recurse { } [ ] tree
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