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51 lines
1.6 KiB
Nix
51 lines
1.6 KiB
Nix
# This expression returns a list of all fetchurl calls used by ‘expr’.
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with import ../.. { };
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with lib;
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{ expr }:
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let
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root = expr;
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uniqueUrls = map (x: x.file) (genericClosure {
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startSet = map (file: { key = file.url; inherit file; }) urls;
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operator = const [ ];
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});
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urls = map (drv: { url = head (drv.urls or [ drv.url ]); hash = drv.outputHash; type = drv.outputHashAlgo; name = drv.name; }) fetchurlDependencies;
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fetchurlDependencies =
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filter
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(drv: drv.outputHash or "" != "" && drv.outputHashMode or "flat" == "flat"
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&& drv.postFetch or "" == "" && (drv ? url || drv ? urls))
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dependencies;
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dependencies = map (x: x.value) (genericClosure {
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startSet = map keyDrv (derivationsIn' root);
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operator = { key, value }: map keyDrv (immediateDependenciesOf value);
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});
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derivationsIn' = x:
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if !canEval x then []
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else if isDerivation x then optional (canEval x.drvPath) x
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else if isList x then concatLists (map derivationsIn' x)
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else if isAttrs x then concatLists (mapAttrsToList (n: v: addErrorContext "while finding tarballs in '${n}':" (derivationsIn' v)) x)
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else [ ];
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keyDrv = drv: if canEval drv.drvPath then { key = drv.drvPath; value = drv; } else { };
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immediateDependenciesOf = drv:
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concatLists (mapAttrsToList (n: v: derivationsIn v) (removeAttrs drv ["meta" "passthru"]));
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derivationsIn = x:
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if !canEval x then []
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else if isDerivation x then optional (canEval x.drvPath) x
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else if isList x then concatLists (map derivationsIn x)
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else [ ];
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canEval = val: (builtins.tryEval val).success;
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in uniqueUrls
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