wroclaw-git-backups/nix
1
0
Fork 0
mirror of https://github.com/NixOS/nix synced 2025-07-06 21:41:48 +02:00
Code Activity

Add function queryPathFromHashPart()

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

11
perl/lib/Nix/Store.xs
View file

@ -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 {