[Support] Make sure sys::fs::remove can remove symbolic links and make sure LockFileManager can handle a symbolic link that points nowhere.

llvm-svn: 204422

1 files changed, 32 insertions, 0 deletions

diff --git a/llvm/unittests/Support/LockFileManagerTest.cpp b/llvm/unittests/Support/LockFileManagerTest.cpp
index 1f949a3..6392739 100644
--- a/llvm/unittests/Support/LockFileManagerTest.cpp
+++ b/llvm/unittests/Support/LockFileManagerTest.cpp
@@ -44,4 +44,36 @@ TEST(LockFileManagerTest, Basic) {
   ASSERT_FALSE(EC);
 }
 
+TEST(LockFileManagerTest, LinkLockExists) {
+  SmallString<64> TmpDir;
+  error_code EC;
+  EC = sys::fs::createUniqueDirectory("LockFileManagerTestDir", TmpDir);
+  ASSERT_FALSE(EC);
+
+  SmallString<64> LockedFile(TmpDir);
+  sys::path::append(LockedFile, "file");
+
+  SmallString<64> FileLocK(TmpDir);
+  sys::path::append(FileLocK, "file.lock");
+
+  SmallString<64> TmpFileLock(TmpDir);
+  sys::path::append(TmpFileLock, "file.lock-000");
+
+  EC = sys::fs::create_link(TmpFileLock.str(), FileLocK.str());
+  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)));
+
+  EC = sys::fs::remove(StringRef(TmpDir));
+  ASSERT_FALSE(EC);
+}
+
 } // end anonymous namespace