LockFileManagerTest.cpp
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//===- unittests/LockFileManagerTest.cpp - LockFileManager tests ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/LockFileManager.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Testing/Support/SupportHelpers.h"
#include "gtest/gtest.h"
#include <memory>
using namespace llvm;
using llvm::unittest::TempDir;
namespace {
TEST(LockFileManagerTest, Basic) {
TempDir TmpDir("LockFileManagerTestDir", /*Unique*/ true);
SmallString<64> LockedFile(TmpDir.path());
sys::path::append(LockedFile, "file.lock");
{
// The lock file should not exist, so we should successfully acquire it.
LockFileManager Locked1(LockedFile);
EXPECT_EQ(LockFileManager::LFS_Owned, Locked1.getState());
// Attempting to reacquire the lock should fail. Waiting on it would cause
// deadlock, so don't try that.
LockFileManager Locked2(LockedFile);
EXPECT_NE(LockFileManager::LFS_Owned, Locked2.getState());
}
// Now that the lock is out of scope, the file should be gone.
EXPECT_FALSE(sys::fs::exists(StringRef(LockedFile)));
}
TEST(LockFileManagerTest, LinkLockExists) {
TempDir LockFileManagerTestDir("LockFileManagerTestDir", /*Unique*/ true);
SmallString<64> LockedFile(LockFileManagerTestDir.path());
sys::path::append(LockedFile, "file");
SmallString<64> FileLocK(LockFileManagerTestDir.path());
sys::path::append(FileLocK, "file.lock");
SmallString<64> TmpFileLock(LockFileManagerTestDir.path());
sys::path::append(TmpFileLock, "file.lock-000");
int FD;
std::error_code EC = sys::fs::openFileForWrite(StringRef(TmpFileLock), FD);
ASSERT_FALSE(EC);
int Ret = close(FD);
ASSERT_EQ(Ret, 0);
EC = sys::fs::create_link(TmpFileLock.str(), FileLocK.str());
ASSERT_FALSE(EC);
EC = sys::fs::remove(StringRef(TmpFileLock));
ASSERT_FALSE(EC);
{
// The lock file doesn't point to a real file, so we should successfully
// acquire it.
LockFileManager Locked(LockedFile);
EXPECT_EQ(LockFileManager::LFS_Owned, Locked.getState());
}
// Now that the lock is out of scope, the file should be gone.
EXPECT_FALSE(sys::fs::exists(StringRef(LockedFile)));
}
TEST(LockFileManagerTest, RelativePath) {
TempDir LockFileManagerTestDir("LockFileManagerTestDir", /*Unique*/ true);
char PathBuf[1024];
const char *OrigPath = getcwd(PathBuf, 1024);
ASSERT_FALSE(chdir(LockFileManagerTestDir.c_str()));
TempDir inner("inner");
SmallString<64> LockedFile(inner.path());
sys::path::append(LockedFile, "file");
SmallString<64> FileLock(LockedFile);
FileLock += ".lock";
{
// The lock file should not exist, so we should successfully acquire it.
LockFileManager Locked(LockedFile);
EXPECT_EQ(LockFileManager::LFS_Owned, Locked.getState());
EXPECT_TRUE(sys::fs::exists(FileLock.str()));
}
// Now that the lock is out of scope, the file should be gone.
EXPECT_FALSE(sys::fs::exists(LockedFile.str()));
EXPECT_FALSE(sys::fs::exists(FileLock.str()));
ASSERT_FALSE(chdir(OrigPath));
}
} // end anonymous namespace