about summary refs log tree commit diff
path: root/perl/lib/Nix/Store.pm
diff options
context:
space:
mode:
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 /perl/lib/Nix/Store.pm
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 'perl/lib/Nix/Store.pm')
-rw-r--r--perl/lib/Nix/Store.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/perl/lib/Nix/Store.pm b/perl/lib/Nix/Store.pm
index 8312a732cdea..2e79c74fe290 100644
--- a/perl/lib/Nix/Store.pm
+++ b/perl/lib/Nix/Store.pm
@@ -14,6 +14,7 @@ our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );
 
 our @EXPORT = qw(
     isValidPath queryReferences queryPathInfo queryDeriver queryPathHash
+    queryPathFromHashPart
     topoSortPaths computeFSClosure followLinksToStorePath exportPaths
     hashPath hashFile hashString
     addToStore makeFixedOutputPath