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StorePath: Rewrite in C++

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On nix-env -qa -f '<nixpkgs>', this reduces maximum RSS by 20970 KiB
and runtime by 0.8%. This is mostly because we're not parsing the hash
part as a hash anymore (just validating that it consists of base-32
characters).

Also, replace storePathToHash() by StorePath::hashPart().
This commit is contained in:
Eelco Dolstra 2020-06-16 14:16:39 +02:00
parent 72e17290d4
commit 759947bf72
21 changed files with 110 additions and 111 deletions
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14
src/libstore/store-api.cc
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@ -59,14 +59,6 @@ StorePathWithOutputs Store::followLinksToStorePathWithOutputs(std::string_view p
}
string storePathToHash(const Path & path)
{
auto base = baseNameOf(path);
assert(base.size() >= storePathHashLen);
return string(base, 0, storePathHashLen);
}
/* Store paths have the following form:
<store>/<h>-<name>
@ -144,7 +136,7 @@ StorePath Store::makeStorePath(const string & type,
/* e.g., "source:sha256:1abc...:/nix/store:foo.tar.gz" */
string s = type + ":" + hash.to_string(Base16, true) + ":" + storeDir + ":" + std::string(name);
auto h = compressHash(hashString(htSHA256, s), 20);
return StorePath::make(h.hash, name);
return StorePath(h, name);
}
@ -243,7 +235,7 @@ bool Store::PathInfoCacheValue::isKnownNow()
bool Store::isValidPath(const StorePath & storePath)
{
auto hashPart = storePathToHash(printStorePath(storePath));
std::string hashPart(storePath.hashPart());
{
auto state_(state.lock());
@ -311,7 +303,7 @@ void Store::queryPathInfo(const StorePath & storePath,
std::string hashPart;
try {
hashPart = storePathToHash(printStorePath(storePath));
hashPart = storePath.hashPart();
{
auto res = state.lock()->pathInfoCache.get(hashPart);