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Try to fix macOS Nixpkgs lib test failure

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Sometimes we read a directory with children we cannot stat. It's a pitty
we even try to stat at all (wasteful) in the `DT_UNKNOWN` case, but at
least this should get rid of the failure.
This commit is contained in:
John Ericson 2024-05-07 13:57:39 -04:00
parent a3c573950b
commit 72a0d4b022
2 changed files with 30 additions and 9 deletions
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8
src/libstore/unix/gc.cc
View file

@ -256,6 +256,14 @@ void LocalStore::findRoots(const Path & path, std::filesystem::file_type type, R
}
catch (std::filesystem::filesystem_error & e) {
/* We only ignore permanent failures. */
if (e.code() == std::errc::permission_denied || e.code() == std::errc::no_such_file_or_directory || e.code() == std::errc::not_a_directory)
printInfo("cannot read potential root '%1%'", path);
else
throw;
}
catch (SysError & e) {
/* We only ignore permanent failures. */
if (e.errNo == EACCES || e.errNo == ENOENT || e.errNo == ENOTDIR)

25
src/libutil/posix-source-accessor.cc
View file

@ -133,18 +133,31 @@ SourceAccessor::DirEntries PosixSourceAccessor::readDirectory(const CanonPath &
assertNoSymlinks(path);
DirEntries res;
for (auto & entry : nix::readDirectory(makeAbsPath(path).string())) {
std::optional<Type> type;
auto type = [&]() -> std::optional<Type> {
std::filesystem::file_type nativeType;
try {
nativeType = entry.symlink_status().type();
} catch (std::filesystem::filesystem_error & e) {
// We cannot always stat the child. (Ideally there is no
// stat because the native directory entry has the type
// already, but this isn't always the case.)
if (e.code() == std::errc::permission_denied || e.code() == std::errc::operation_not_permitted)
return std::nullopt;
else throw;
}
// cannot exhaustively enumerate because implementation-specific
// additional file types are allowed.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch-enum"
switch (entry.symlink_status().type()) {
case std::filesystem::file_type::regular: type = Type::tRegular; break;
case std::filesystem::file_type::symlink: type = Type::tSymlink; break;
case std::filesystem::file_type::directory: type = Type::tDirectory; break;
default: type = tMisc;
switch (nativeType) {
case std::filesystem::file_type::regular: return Type::tRegular; break;
case std::filesystem::file_type::symlink: return Type::tSymlink; break;
case std::filesystem::file_type::directory: return Type::tDirectory; break;
default: return tMisc;
}
#pragma GCC diagnostic pop
}();
res.emplace(entry.path().filename().string(), type);
}
return res;