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Merge pull request #11378 from Mic92/nix-dir-errors

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builtins.readDir: fix nix error trace on filesystem errors
This commit is contained in:
John Ericson 2024-09-11 13:10:28 -04:00 • committed by GitHub
commit db7c868d24
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6 changed files with 92 additions and 40 deletions
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40
src/libutil/posix-source-accessor.cc
View file

@ -132,23 +132,24 @@ SourceAccessor::DirEntries PosixSourceAccessor::readDirectory(const CanonPath &
{
assertNoSymlinks(path);
DirEntries res;
for (auto & entry : std::filesystem::directory_iterator{makeAbsPath(path)}) {
checkInterrupt();
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;
}
try {
for (auto & entry : std::filesystem::directory_iterator{makeAbsPath(path)}) {
checkInterrupt();
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.
// cannot exhaustively enumerate because implementation-specific
// additional file types are allowed.
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wswitch-enum"
switch (nativeType) {
@ -158,8 +159,11 @@ SourceAccessor::DirEntries PosixSourceAccessor::readDirectory(const CanonPath &
default: return tMisc;
}
#pragma GCC diagnostic pop
}();
res.emplace(entry.path().filename().string(), type);
}();
res.emplace(entry.path().filename().string(), type);
}
} catch (std::filesystem::filesystem_error & e) {
throw SysError("reading directory %1%", showPath(path));
}
return res;
}

22
src/libutil/tarfile.cc
View file

@ -8,6 +8,10 @@
namespace nix {
namespace fs {
using namespace std::filesystem;
}
namespace {
int callback_open(struct archive *, void * self)
@ -102,14 +106,14 @@ TarArchive::TarArchive(Source & source, bool raw, std::optional<std::string> com
"Failed to open archive (%s)");
}
TarArchive::TarArchive(const Path & path)
TarArchive::TarArchive(const fs::path & path)
: archive{archive_read_new()}
, buffer(defaultBufferSize)
{
archive_read_support_filter_all(archive);
enableSupportedFormats(archive);
archive_read_set_option(archive, NULL, "mac-ext", NULL);
check(archive_read_open_filename(archive, path.c_str(), 16384), "failed to open archive: %s");
check(archive_read_open_filename(archive, path.string().c_str(), 16384), "failed to open archive: %s");
}
void TarArchive::close()
@ -123,7 +127,7 @@ TarArchive::~TarArchive()
archive_read_free(this->archive);
}
static void extract_archive(TarArchive & archive, const Path & destDir)
static void extract_archive(TarArchive & archive, const fs::path & destDir)
{
int flags = ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_SECURE_SYMLINKS | ARCHIVE_EXTRACT_SECURE_NODOTDOT;
@ -140,7 +144,7 @@ static void extract_archive(TarArchive & archive, const Path & destDir)
else
archive.check(r);
archive_entry_copy_pathname(entry, (destDir + "/" + name).c_str());
archive_entry_copy_pathname(entry, (destDir / name).string().c_str());
// sources can and do contain dirs with no rx bits
if (archive_entry_filetype(entry) == AE_IFDIR && (archive_entry_mode(entry) & 0500) != 0500)
@ -149,7 +153,7 @@ static void extract_archive(TarArchive & archive, const Path & destDir)
// Patch hardlink path
const char * original_hardlink = archive_entry_hardlink(entry);
if (original_hardlink) {
archive_entry_copy_hardlink(entry, (destDir + "/" + original_hardlink).c_str());
archive_entry_copy_hardlink(entry, (destDir / original_hardlink).string().c_str());
}
archive.check(archive_read_extract(archive.archive, entry, flags));
@ -158,19 +162,19 @@ static void extract_archive(TarArchive & archive, const Path & destDir)
archive.close();
}
void unpackTarfile(Source & source, const Path & destDir)
void unpackTarfile(Source & source, const fs::path & destDir)
{
auto archive = TarArchive(source);
createDirs(destDir);
fs::create_directories(destDir);
extract_archive(archive, destDir);
}
void unpackTarfile(const Path & tarFile, const Path & destDir)
void unpackTarfile(const fs::path & tarFile, const fs::path & destDir)
{
auto archive = TarArchive(tarFile);
createDirs(destDir);
fs::create_directories(destDir);
extract_archive(archive, destDir);
}

6
src/libutil/tarfile.hh
View file

@ -15,7 +15,7 @@ struct TarArchive
void check(int err, const std::string & reason = "failed to extract archive (%s)");
explicit TarArchive(const Path & path);
explicit TarArchive(const std::filesystem::path & path);
/// @brief Create a generic archive from source.
/// @param source - Input byte stream.
@ -37,9 +37,9 @@ struct TarArchive
int getArchiveFilterCodeByName(const std::string & method);
void unpackTarfile(Source & source, const Path & destDir);
void unpackTarfile(Source & source, const std::filesystem::path & destDir);
void unpackTarfile(const Path & tarFile, const Path & destDir);
void unpackTarfile(const std::filesystem::path & tarFile, const std::filesystem::path & destDir);
time_t unpackTarfileToSink(TarArchive & archive, ExtendedFileSystemObjectSink & parseSink);