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copyPaths(): Don't query path info for a path the target already has

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For example, this cuts "nix-copy-closure --from" on a NixOS system
closure from 15.9s to 0.5s.
This commit is contained in:
Eelco Dolstra 2017-03-16 12:05:51 +01:00
parent ea7fa88131
commit 91d67692cf
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src/libstore/store-api.cc
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@ -822,6 +822,7 @@ void copyPaths(ref<Store> from, ref<Store> to, const Paths & storePaths, bool su
PathSet(storePaths.begin(), storePaths.end()), PathSet(storePaths.begin(), storePaths.end()),
[&](const Path & storePath) { [&](const Path & storePath) {
if (to->isValidPath(storePath)) return PathSet();
return from->queryPathInfo(storePath)->references; return from->queryPathInfo(storePath)->references;
}, },