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Cleanup the interface for creating soft or hard links.

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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
This commit is contained in:
Rafael Espindola 2014-03-11 18:40:24 +00:00
parent 7e3e9aa8e1
commit 8acff70de1
5 changed files with 20 additions and 39 deletions
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13
include/llvm/Support/FileSystem.h
View File

@ -285,13 +285,18 @@ error_code create_directories(const Twine &path, bool IgnoreExisting = true);
/// 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.
///

33
lib/Support/LockFileManager.cpp
View File

@ -67,22 +67,6 @@ bool LockFileManager::processStillExecuting(StringRef Hostname, int PID) {
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;
@ -132,20 +116,9 @@ LockFileManager::LockFileManager(StringRef 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;

6
lib/Support/Unix/Path.inc
View File

@ -272,14 +272,16 @@ error_code create_directory(const Twine &path, bool IgnoreExisting) {
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();

3
lib/Support/Windows/Path.inc
View File

@ -158,7 +158,8 @@ error_code create_directory(const Twine &path, bool IgnoreExisting) {
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;

4
unittests/Support/Path.cpp
View File

@ -299,7 +299,7 @@ TEST_F(FileSystemTest, Unique) {
// 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);
@ -365,7 +365,7 @@ TEST_F(FileSystemTest, TempFiles) {
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);