unittests/Support/LockFileManagerTest.cpp

   1 //===- unittests/LockFileManagerTest.cpp - LockFileManager tests ----------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9
  10 #include "llvm/Support/LockFileManager.h"
  11 #include "llvm/Support/FileSystem.h"
  12 #include "llvm/Support/Path.h"
  13 #include "gtest/gtest.h"
  14 #include <memory>
  15
  16 using namespace llvm;
  17
  18 namespace {
  19
  20 TEST(LockFileManagerTest, Basic) {
  21   SmallString<64> TmpDir;
  22   std::error_code EC;
  23   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
  24   ASSERT_FALSE(EC);
  25
  26   SmallString<64> LockedFile(TmpDir);
  27   sys::path::append(LockedFile, "file.lock");
  28
  29   {
  30     // The lock file should not exist, so we should successfully acquire it.
  31     LockFileManager Locked1(LockedFile);
  32     EXPECT_EQ(LockFileManager::LFS_Owned, Locked1.getState());
  33
  34     // Attempting to reacquire the lock should fail.  Waiting on it would cause
  35     // deadlock, so don't try that.
  36     LockFileManager Locked2(LockedFile);
  37     EXPECT_NE(LockFileManager::LFS_Owned, Locked2.getState());
  38   }
  39
  40   // Now that the lock is out of scope, the file should be gone.
  41   EXPECT_FALSE(sys::fs::exists(StringRef(LockedFile)));
  42
  43   EC = sys::fs::remove(StringRef(TmpDir));
  44   ASSERT_FALSE(EC);
  45 }
  46
  47 TEST(LockFileManagerTest, LinkLockExists) {
  48   SmallString<64> TmpDir;
  49   std::error_code EC;
  50   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
  51   ASSERT_FALSE(EC);
  52
  53   SmallString<64> LockedFile(TmpDir);
  54   sys::path::append(LockedFile, "file");
  55
  56   SmallString<64> FileLocK(TmpDir);
  57   sys::path::append(FileLocK, "file.lock");
  58
  59   SmallString<64> TmpFileLock(TmpDir);
  60   sys::path::append(TmpFileLock, "file.lock-000");
  61
  62   int FD;
  63   EC = sys::fs::openFileForWrite(StringRef(TmpFileLock), FD);
  64   ASSERT_FALSE(EC);
  65
  66   int Ret = close(FD);
  67   ASSERT_EQ(Ret, 0);
  68
  69   EC = sys::fs::create_link(TmpFileLock.str(), FileLocK.str());
  70   ASSERT_FALSE(EC);
  71
  72   EC = sys::fs::remove(StringRef(TmpFileLock));
  73   ASSERT_FALSE(EC);
  74
  75   {
  76     // The lock file doesn't point to a real file, so we should successfully
  77     // acquire it.
  78     LockFileManager Locked(LockedFile);
  79     EXPECT_EQ(LockFileManager::LFS_Owned, Locked.getState());
  80   }
  81
  82   // Now that the lock is out of scope, the file should be gone.
  83   EXPECT_FALSE(sys::fs::exists(StringRef(LockedFile)));
  84
  85   EC = sys::fs::remove(StringRef(TmpDir));
  86   ASSERT_FALSE(EC);
  87 }
  88
  89
  90 TEST(LockFileManagerTest, RelativePath) {
  91   SmallString<64> TmpDir;
  92   std::error_code EC;
  93   EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
  94   ASSERT_FALSE(EC);
  95
  96   char PathBuf[1024];
  97   const char *OrigPath = getcwd(PathBuf, 1024);
  98   ASSERT_FALSE(chdir(TmpDir.c_str()));
  99
 100   sys::fs::create_directory("inner");
 101   SmallString<64> LockedFile("inner");
 102   sys::path::append(LockedFile, "file");
 103
 104   SmallString<64> FileLock(LockedFile);
 105   FileLock += ".lock";
 106
 107   {
 108     // The lock file should not exist, so we should successfully acquire it.
 109     LockFileManager Locked(LockedFile);
 110     EXPECT_EQ(LockFileManager::LFS_Owned, Locked.getState());
 111     EXPECT_TRUE(sys::fs::exists(FileLock.str()));
 112   }
 113
 114   // Now that the lock is out of scope, the file should be gone.
 115   EXPECT_FALSE(sys::fs::exists(LockedFile.str()));
 116   EXPECT_FALSE(sys::fs::exists(FileLock.str()));
 117
 118   EC = sys::fs::remove("inner");
 119   ASSERT_FALSE(EC);
 120
 121   ASSERT_FALSE(chdir(OrigPath));
 122
 123   EC = sys::fs::remove(StringRef(TmpDir));
 124   ASSERT_FALSE(EC);
 125 }
 126
 127 } // end anonymous namespace