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Add function to extract hash part of a store path

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This commit is contained in:
Eelco Dolstra 2016-02-15 12:49:01 +01:00
parent 74f954ee62
commit d089372565
3 changed files with 15 additions and 2 deletions
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2
src/libstore/local-store.cc
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@ -1064,7 +1064,7 @@ StringSet LocalStore::queryDerivationOutputNames(const Path & path)
Path LocalStore::queryPathFromHashPart(const string & hashPart)
{
if (hashPart.size() != 32) throw Error("invalid hash part");
if (hashPart.size() != storePathHashLen) throw Error("invalid hash part");
Path prefix = settings.nixStore + "/" + hashPart;

9
src/libstore/store-api.cc
View file

@ -61,7 +61,14 @@ Path followLinksToStorePath(const Path & path)
string storePathToName(const Path & path)
{
assertStorePath(path);
return string(path, settings.nixStore.size() + 34);
return string(path, settings.nixStore.size() + storePathHashLen + 2);
}
string storePathToHash(const Path & path)
{
assertStorePath(path);
return string(path, settings.nixStore.size() + 1, storePathHashLen);
}

6
src/libstore/store-api.hh
View file

@ -339,6 +339,9 @@ public:
};
const size_t storePathHashLen = 32; // base-32 characters, i.e. 160 bits
/* !!! These should be part of the store API, I guess. */
/* Throw an exception if `path' is not directly in the Nix store. */
@ -350,6 +353,9 @@ bool isStorePath(const Path & path);
/* Extract the name part of the given store path. */
string storePathToName(const Path & path);
/* Extract the hash part of the given store path. */
string storePathToHash(const Path & path);
void checkStoreName(const string & name);