Before this patch the unix code for creating hardlinks was unused. The code
for creating symbolic links was implemented in lib/Support/LockFileManager.cpp
and the code for creating hard links in lib/Support/*/Path.inc.
The only use we have for these is in LockFileManager.cpp and it can use both
soft and hard links. Just have a create_link function that creates one or the
other depending on the platform.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203596
91177308-0d34-0410-b5e6-
96231b3b80d8
/// error if the directory already existed.
error_code create_directory(const Twine &path, bool IgnoreExisting = true);
-/// @brief Create a hard link from \a from to \a to.
+/// @brief Create a link from \a from to \a to.
+///
+/// The link may be a soft or a hard link, depending on the platform. The caller
+/// may not assume which one. Currently on windows it creates a hard link since
+/// soft links require extra privileges. On unix, it creates a soft link since
+/// hard links don't work on SMB file systems.
///
/// @param to The path to hard link to.
/// @param from The path to hard link from. This is created.
-/// @returns errc::success if exists(to) && exists(from) && equivalent(to, from)
-/// , otherwise a platform specific error_code.
-error_code create_hard_link(const Twine &to, const Twine &from);
+/// @returns errc::success if the link was created, otherwise a platform
+/// specific error_code.
+error_code create_link(const Twine &to, const Twine &from);
/// @brief Get the current path.
///
return true;
}
-#if LLVM_ON_UNIX
-static error_code unix_create_symbolic_link(const Twine &to,
- const Twine &from) {
- // Get arguments.
- SmallString<128> from_storage;
- SmallString<128> to_storage;
- StringRef f = from.toNullTerminatedStringRef(from_storage);
- StringRef t = to.toNullTerminatedStringRef(to_storage);
-
- if (::symlink(t.begin(), f.begin()) == -1)
- return error_code(errno, system_category());
-
- return error_code::success();
-}
-#endif
-
LockFileManager::LockFileManager(StringRef FileName)
{
this->FileName = FileName;
}
while (1) {
-#if LLVM_ON_UNIX
- // Create a symbolic link from the lock file name. If this succeeds, we're
- // done. Note that we are using symbolic link because hard links are not
- // supported by all filesystems.
- error_code EC
- = unix_create_symbolic_link(UniqueLockFileName.str(),
- LockFileName.str());
-#else
- // We can't use symbolic links for windows.
- // Create a hard link from the lock file name. If this succeeds, we're done.
- error_code EC
- = sys::fs::create_hard_link(UniqueLockFileName.str(),
- LockFileName.str());
-#endif
+ // Create a link from the lock file name. If this succeeds, we're done.
+ error_code EC =
+ sys::fs::create_link(UniqueLockFileName.str(), LockFileName.str());
if (EC == errc::success)
return;
return error_code::success();
}
-error_code create_hard_link(const Twine &to, const Twine &from) {
+// Note that we are using symbolic link because hard links are not supported by
+// all filesystems (SMB doesn't).
+error_code create_link(const Twine &to, const Twine &from) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
StringRef f = from.toNullTerminatedStringRef(from_storage);
StringRef t = to.toNullTerminatedStringRef(to_storage);
- if (::link(t.begin(), f.begin()) == -1)
+ if (::symlink(t.begin(), f.begin()) == -1)
return error_code(errno, system_category());
return error_code::success();
return error_code::success();
}
-error_code create_hard_link(const Twine &to, const Twine &from) {
+// We can't use symbolic links for windows.
+error_code create_link(const Twine &to, const Twine &from) {
// Get arguments.
SmallString<128> from_storage;
SmallString<128> to_storage;
// Two paths representing the same file on disk should still provide the
// same unique id. We can test this by making a hard link.
- ASSERT_NO_ERROR(fs::create_hard_link(Twine(TempPath), Twine(TempPath2)));
+ ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
fs::UniqueID D2;
ASSERT_NO_ERROR(fs::getUniqueID(Twine(TempPath2), D2));
ASSERT_EQ(D2, F1);
ASSERT_FALSE(TempPath3.endswith("."));
// Create a hard link to Temp1.
- ASSERT_NO_ERROR(fs::create_hard_link(Twine(TempPath), Twine(TempPath2)));
+ ASSERT_NO_ERROR(fs::create_link(Twine(TempPath), Twine(TempPath2)));
bool equal;
ASSERT_NO_ERROR(fs::equivalent(Twine(TempPath), Twine(TempPath2), equal));
EXPECT_TRUE(equal);