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

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llvm-svn: 204422
This commit is contained in:
Argyrios Kyrtzidis 2014-03-21 01:25:37 +00:00
parent 239d7d1128
commit 01f7e30c52
3 changed files with 37 additions and 8 deletions
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9
lib/Support/LockFileManager.cpp
View File

@ -29,16 +29,13 @@ using namespace llvm;
/// \returns The process ID of the process that owns this lock file
Optional<std::pair<std::string, int> >
LockFileManager::readLockFile(StringRef LockFileName) {
// Check whether the lock file exists. If not, clearly there's nothing
// to read, so we just return.
if (!sys::fs::exists(LockFileName))
return None;
// Read the owning host and PID out of the lock file. If it appears that the
// owning process is dead, the lock file is invalid.
std::unique_ptr<MemoryBuffer> MB;
if (MemoryBuffer::getFile(LockFileName, MB))
if (MemoryBuffer::getFile(LockFileName, MB)) {
sys::fs::remove(LockFileName);
return None;
}
StringRef Hostname;
StringRef PIDStr;

4
lib/Support/Unix/Path.inc
View File

@ -305,7 +305,7 @@ error_code remove(const Twine &path, bool IgnoreNonExisting) {
StringRef p = path.toNullTerminatedStringRef(path_storage);
struct stat buf;
if (stat(p.begin(), &buf) != 0) {
if (lstat(p.begin(), &buf) != 0) {
if (errno != errc::no_such_file_or_directory || !IgnoreNonExisting)
return error_code(errno, system_category());
return error_code::success();
@ -316,7 +316,7 @@ error_code remove(const Twine &path, bool IgnoreNonExisting) {
// check ensures that what we're trying to erase is a regular file. It
// effectively prevents LLVM from erasing things like /dev/null, any block
// special file, or other things that aren't "regular" files.
if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode))
if (!S_ISREG(buf.st_mode) && !S_ISDIR(buf.st_mode) && !S_ISLNK(buf.st_mode))
return make_error_code(errc::operation_not_permitted);
if (::remove(p.begin()) == -1) {

32
unittests/Support/LockFileManagerTest.cpp
View File

@ -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