39 lines
1.1 KiB
Nix
39 lines
1.1 KiB
Nix
# Source https://github.com/Mic92/nix-build-uncached/blob/master/scripts/force_cached.nix
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coreutils: attrs:
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with builtins;
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let
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# Copied from <nixpkgs/lib>
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isDerivation = x: isAttrs x && x ? type && x.type == "derivation";
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# Return true if `nix-build` would traverse that attribute set to look for
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# more derivations to build.
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hasRecurseIntoAttrs = x: isAttrs x && (x.recurseForDerivations or false);
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# Wraps derivations that disallow substitutes so that they can be cached.
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toCachedDrv = drv:
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if !(drv.allowSubstitutes or true) then
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derivation
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{
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name = "${drv.name}-to-cached";
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system = drv.system;
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builder = "/bin/sh";
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args = [ "-c" "${coreutils}/bin/ln -s ${drv} $out; exit 0" ];
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}
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else
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drv;
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op = _: val:
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if isDerivation val then
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toCachedDrv val
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else if hasRecurseIntoAttrs val then
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forceCached val
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else
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val
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;
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# Traverses a tree of derivation and wrap all of those that disallow
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# substitutes.
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forceCached = attrs: mapAttrs op attrs;
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in
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forceCached attrs
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