[Support] Implement is_local_impl with AIX mntctl

Summary:
On AIX, we can determine whether a filesystem is remote using `mntctl`.

If the information is not found, then claim that the file is remote
(since that is the more restrictive case). Testing for the associated
interface is restored with a modified version of the unit test from
rL295768.

Reviewers: jasonliu, xingxue

Reviewed By: xingxue

Subscribers: jsji, apaprocki, Hahnfeld, zturner, krytarowski, kristina, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58801

llvm-svn: 357333

1 files changed, 23 insertions, 0 deletions

diff --git a/llvm/unittests/Support/Path.cpp b/llvm/unittests/Support/Path.cpp
index 7ce6d2d52db..3c0f7936030 100644
--- a/llvm/unittests/Support/Path.cpp
+++ b/llvm/unittests/Support/Path.cpp
@@ -1492,6 +1492,29 @@ TEST_F(FileSystemTest, ReadWriteFileCanReadOrWrite) {
   verifyWrite(FD, "Buzz", true);
 }
 
+TEST_F(FileSystemTest, is_local) {
+  bool TestDirectoryIsLocal;
+  ASSERT_NO_ERROR(fs::is_local(TestDirectory, TestDirectoryIsLocal));
+  EXPECT_EQ(TestDirectoryIsLocal, fs::is_local(TestDirectory));
+
+  int FD;
+  SmallString<128> TempPath;
+  ASSERT_NO_ERROR(
+      fs::createUniqueFile(Twine(TestDirectory) + "/temp", FD, TempPath));
+  FileRemover Cleanup(TempPath);
+
+  // Make sure it exists.
+  ASSERT_TRUE(sys::fs::exists(Twine(TempPath)));
+
+  bool TempFileIsLocal;
+  ASSERT_NO_ERROR(fs::is_local(FD, TempFileIsLocal));
+  EXPECT_EQ(TempFileIsLocal, fs::is_local(FD));
+
+  // Expect that the file and its parent directory are equally local or equally
+  // remote.
+  EXPECT_EQ(TestDirectoryIsLocal, TempFileIsLocal);
+}
+
 TEST_F(FileSystemTest, set_current_path) {
   SmallString<128> path;