From ccc52adfb2121ade510d35dc9b91193af9fa731e Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Tue, 17 Jul 2012 18:55:39 -0400 Subject: 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/* is expensive since it requires reading the entire directory. queryPathFromHashPart() prevents this by doing a cheap database lookup. --- perl/lib/Nix/Store.pm | 1 + perl/lib/Nix/Store.xs | 11 +++++++++++ 2 files changed, 12 insertions(+) (limited to 'perl') 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 diff --git a/perl/lib/Nix/Store.xs b/perl/lib/Nix/Store.xs index 2ebff5575616..76de674e6d5b 100644 --- a/perl/lib/Nix/Store.xs +++ b/perl/lib/Nix/Store.xs @@ -108,6 +108,17 @@ SV * queryPathInfo(char * path, int base32) } +SV * queryPathFromHashPart(char * hashPart) + PPCODE: + try { + doInit(); + Path path = store->queryPathFromHashPart(hashPart); + XPUSHs(sv_2mortal(newSVpv(path.c_str(), 0))); + } catch (Error & e) { + croak(e.what()); + } + + SV * computeFSClosure(int flipDirection, int includeOutputs, ...) PPCODE: try { -- cgit 1.4.1