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@ -72,11 +72,13 @@ static PathSet realisePath(StorePathWithOutputs path, bool build = true)
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Derivation drv = store->derivationFromPath(path.path);
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rootNr++;
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/* FIXME: Encode this empty special case explicitly in the type. */
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if (path.outputs.empty())
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for (auto & i : drv.outputs) path.outputs.insert(i.first);
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PathSet outputs;
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for (auto & j : path.outputs) {
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/* Match outputs of a store path with outputs of the derivation that produces it. */
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DerivationOutputs::iterator i = drv.outputs.find(j);
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if (i == drv.outputs.end())
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throw Error("derivation '%s' does not have an output named '%s'",
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@ -141,6 +143,7 @@ static void opRealise(Strings opFlags, Strings opArgs)
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toDerivedPaths(paths),
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willBuild, willSubstitute, unknown, downloadSize, narSize);
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/* Filter out unknown paths from `paths`. */
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if (ignoreUnknown) {
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std::vector<StorePathWithOutputs> paths2;
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for (auto & i : paths)
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