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PosixSourceAccessor::cachedLstat(): Use absolute path

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Using the relative path can cause collisions between cache entries for
PosixSourceAccessors with different roots.
This commit is contained in:
Eelco Dolstra 2024-03-04 21:54:35 +01:00
parent eaa6c26189
commit 9ee590e113
1 changed files with 6 additions and 4 deletions
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10
src/libutil/posix-source-accessor.cc
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@ -85,16 +85,18 @@ bool PosixSourceAccessor::pathExists(const CanonPath & path)
std::optional<struct stat> PosixSourceAccessor::cachedLstat(const CanonPath & path)
{
static Sync<std::unordered_map<CanonPath, std::optional<struct stat>>> _cache;
static Sync<std::unordered_map<std::filesystem::path, std::optional<struct stat>>> _cache;
auto absPath = makeAbsPath(path);
{
auto cache(_cache.lock());
auto i = cache->find(path);
auto i = cache->find(absPath);
if (i != cache->end()) return i->second;
}
std::optional<struct stat> st{std::in_place};
if (::lstat(makeAbsPath(path).c_str(), &*st)) {
if (::lstat(absPath.c_str(), &*st)) {
if (errno == ENOENT || errno == ENOTDIR)
st.reset();
else
@ -103,7 +105,7 @@ std::optional<struct stat> PosixSourceAccessor::cachedLstat(const CanonPath & pa
auto cache(_cache.lock());
if (cache->size() >= 16384) cache->clear();
cache->emplace(path, st);
cache->emplace(absPath, st);
return st;
}