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Add function queryPathFromHashPart()

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To implement binary caches efficiently, Hydra needs to be able to map
the hash part of a store path (e.g. "gbg...zr7") to the full store
path (e.g. "/nix/store/gbg...kzr7-subversion-1.7.5").  (The binary
cache mechanism uses hash parts as a key for looking up store paths to
ensure privacy.)  However, doing a search in the Nix store for
/nix/store/<hash>* is expensive since it requires reading the entire
directory.  queryPathFromHashPart() prevents this by doing a cheap
database lookup.
This commit is contained in:
Eelco Dolstra 2012-07-17 18:55:39 -04:00
parent 220818f758
commit ccc52adfb2
9 changed files with 67 additions and 0 deletions
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12
src/libstore/remote-store.cc
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@ -341,6 +341,18 @@ PathSet RemoteStore::queryDerivationOutputNames(const Path & path)
}
Path RemoteStore::queryPathFromHashPart(const string & hashPart)
{
openConnection();
writeInt(wopQueryPathFromHashPart, to);
writeString(hashPart, to);
processStderr();
Path path = readString(from);
if (!path.empty()) assertStorePath(path);
return path;
}
Path RemoteStore::addToStore(const Path & _srcPath,
bool recursive, HashType hashAlgo, PathFilter & filter)
{