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authorEelco Dolstra <eelco.dolstra@logicblox.com>2012-07-17T22·55-0400
committerEelco Dolstra <eelco.dolstra@logicblox.com>2012-07-17T22·55-0400
commitccc52adfb2121ade510d35dc9b91193af9fa731e (patch)
treec6314b5198cdfbe9a21633e515203965ee431382 /src/libexpr/eval.hh
parent220818f758d2facc194f567f35ca677ef79393bd (diff)
Add function queryPathFromHashPart()
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.
Diffstat (limited to 'src/libexpr/eval.hh')
0 files changed, 0 insertions, 0 deletions