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pathInfoCache: Use the entire base name as the cache key

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This fixes a bug in the garbage collector where if a path
/nix/store/abcd-foo is valid, but we do a
isValidPath("/nix/store/abcd-foo.lock") first, then a negative entry
for /nix/store/abcd is added to pathInfoCache, so /nix/store/abcd-foo
is subsequently considered invalid and deleted.
This commit is contained in:
Eelco Dolstra 2021-10-14 13:28:22 +02:00
parent eab934cb2a
commit 0be8cc1466
5 changed files with 27 additions and 23 deletions
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8
src/libstore/binary-cache-store.cc
View file

@ -111,15 +111,15 @@ void BinaryCacheStore::writeNarInfo(ref<NarInfo> narInfo)
upsertFile(narInfoFile, narInfo->to_string(*this), "text/x-nix-narinfo");
std::string hashPart(narInfo->path.hashPart());
{
auto state_(state.lock());
state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = std::shared_ptr<NarInfo>(narInfo) });
state_->pathInfoCache.upsert(
std::string(narInfo->path.to_string()),
PathInfoCacheValue { .value = std::shared_ptr<NarInfo>(narInfo) });
}
if (diskCache)
diskCache->upsertNarInfo(getUri(), hashPart, std::shared_ptr<NarInfo>(narInfo));
diskCache->upsertNarInfo(getUri(), std::string(narInfo->path.hashPart()), std::shared_ptr<NarInfo>(narInfo));
}
AutoCloseFD openFile(const Path & path)

4
src/libstore/local-store.cc
View file

@ -834,7 +834,7 @@ uint64_t LocalStore::addValidPath(State & state,
{
auto state_(Store::state.lock());
state_->pathInfoCache.upsert(std::string(info.path.hashPart()),
state_->pathInfoCache.upsert(std::string(info.path.to_string()),
PathInfoCacheValue{ .value = std::make_shared<const ValidPathInfo>(info) });
}
@ -1207,7 +1207,7 @@ void LocalStore::invalidatePath(State & state, const StorePath & path)
{
auto state_(Store::state.lock());
state_->pathInfoCache.erase(std::string(path.hashPart()));
state_->pathInfoCache.erase(std::string(path.to_string()));
}
}

26
src/libstore/store-api.cc
View file

@ -414,11 +414,9 @@ StorePathSet Store::queryDerivationOutputs(const StorePath & path)
bool Store::isValidPath(const StorePath & storePath)
{
std::string hashPart(storePath.hashPart());
{
auto state_(state.lock());
auto res = state_->pathInfoCache.get(hashPart);
auto res = state_->pathInfoCache.get(std::string(storePath.to_string()));
if (res && res->isKnownNow()) {
stats.narInfoReadAverted++;
return res->didExist();
@ -426,11 +424,11 @@ bool Store::isValidPath(const StorePath & storePath)
}
if (diskCache) {
auto res = diskCache->lookupNarInfo(getUri(), hashPart);
auto res = diskCache->lookupNarInfo(getUri(), std::string(storePath.hashPart()));
if (res.first != NarInfoDiskCache::oUnknown) {
stats.narInfoReadAverted++;
auto state_(state.lock());
state_->pathInfoCache.upsert(hashPart,
state_->pathInfoCache.upsert(std::string(storePath.to_string()),
res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue { .value = res.second });
return res.first == NarInfoDiskCache::oValid;
}
@ -440,7 +438,7 @@ bool Store::isValidPath(const StorePath & storePath)
if (diskCache && !valid)
// FIXME: handle valid = true case.
diskCache->upsertNarInfo(getUri(), hashPart, 0);
diskCache->upsertNarInfo(getUri(), std::string(storePath.hashPart()), 0);
return valid;
}
@ -487,13 +485,11 @@ static bool goodStorePath(const StorePath & expected, const StorePath & actual)
void Store::queryPathInfo(const StorePath & storePath,
Callback<ref<const ValidPathInfo>> callback) noexcept
{
std::string hashPart;
auto hashPart = std::string(storePath.hashPart());
try {
hashPart = storePath.hashPart();
{
auto res = state.lock()->pathInfoCache.get(hashPart);
auto res = state.lock()->pathInfoCache.get(std::string(storePath.to_string()));
if (res && res->isKnownNow()) {
stats.narInfoReadAverted++;
if (!res->didExist())
@ -508,7 +504,7 @@ void Store::queryPathInfo(const StorePath & storePath,
stats.narInfoReadAverted++;
{
auto state_(state.lock());
state_->pathInfoCache.upsert(hashPart,
state_->pathInfoCache.upsert(std::string(storePath.to_string()),
res.first == NarInfoDiskCache::oInvalid ? PathInfoCacheValue{} : PathInfoCacheValue{ .value = res.second });
if (res.first == NarInfoDiskCache::oInvalid ||
!goodStorePath(storePath, res.second->path))
@ -523,7 +519,7 @@ void Store::queryPathInfo(const StorePath & storePath,
auto callbackPtr = std::make_shared<decltype(callback)>(std::move(callback));
queryPathInfoUncached(storePath,
{[this, storePathS{printStorePath(storePath)}, hashPart, callbackPtr](std::future<std::shared_ptr<const ValidPathInfo>> fut) {
{[this, storePath, hashPart, callbackPtr](std::future<std::shared_ptr<const ValidPathInfo>> fut) {
try {
auto info = fut.get();
@ -533,14 +529,12 @@ void Store::queryPathInfo(const StorePath & storePath,
{
auto state_(state.lock());
state_->pathInfoCache.upsert(hashPart, PathInfoCacheValue { .value = info });
state_->pathInfoCache.upsert(std::string(storePath.to_string()), PathInfoCacheValue { .value = info });
}
auto storePath = parseStorePath(storePathS);
if (!info || !goodStorePath(storePath, info->path)) {
stats.narInfoMissing++;
throw InvalidPath("path '%s' is not valid", storePathS);
throw InvalidPath("path '%s' is not valid", printStorePath(storePath));
}
(*callbackPtr)(ref<const ValidPathInfo>(info));

1
src/libstore/store-api.hh
View file

@ -232,7 +232,6 @@ protected:
struct State
{
// FIXME: fix key
LRUCache<std::string, PathInfoCacheValue> pathInfoCache;
};

11
tests/gc.sh
View file

@ -1,5 +1,7 @@
source common.sh
clearStore
drvPath=$(nix-instantiate dependencies.nix)
outPath=$(nix-store -rvv "$drvPath")
@ -23,6 +25,11 @@ test -e $inUse
if nix-store --delete $outPath; then false; fi
test -e $outPath
for i in $NIX_STORE_DIR/*; do
touch $i.lock
touch $i.chroot
done
nix-collect-garbage
# Check that the root and its dependencies haven't been deleted.
@ -38,3 +45,7 @@ nix-collect-garbage
# Check that the output has been GC'd.
if test -e $outPath/foobar; then false; fi
# Check that the store is empty.
rmdir $NIX_STORE_DIR/.links
rmdir $NIX_STORE_DIR