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Implement RemoteStore::queryMissing()

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This provides a significant speedup, e.g. 64 s -> 12 s for

  nix-build --dry-run -I nixpkgs=channel:nixos-16.03 '<nixpkgs/nixos/tests/misc.nix>' -A test

on a cold local and CloudFront cache.

The alternative is to use lots of concurrent daemon connections but
that seems wasteful.
This commit is contained in:
Eelco Dolstra 2017-04-06 18:40:19 +02:00
parent 963f2bf12b
commit ba20730b3f
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5 changed files with 44 additions and 3 deletions
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2
src/libstore/store-api.hh
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@ -524,7 +524,7 @@ public:
/* Given a set of paths that are to be built, return the set of
derivations that will be built, and the set of output paths
that will be substituted. */
void queryMissing(const PathSet & targets,
virtual void queryMissing(const PathSet & targets,
PathSet & willBuild, PathSet & willSubstitute, PathSet & unknown,
unsigned long long & downloadSize, unsigned long long & narSize);