prim_import(): prefetch substitute info in parallel using queryMissing()
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@ -51,6 +51,12 @@ static void prim_import(EvalState & state, Value * * args, Value & v)
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% path % ctx);
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if (isDerivation(ctx))
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try {
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/* For performance, prefetch all substitute info. */
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PathSet willBuild, willSubstitute, unknown;
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unsigned long long downloadSize, narSize;
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queryMissing(*store, singleton<PathSet>(ctx),
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willBuild, willSubstitute, unknown, downloadSize, narSize);
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/* !!! If using a substitute, we only need to fetch
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the selected output of this derivation. */
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store->buildPaths(singleton<PathSet>(ctx));
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