[VFS] Add isLocal to ProxyFileSystem and add unit tests.

[Bigcheese]

Summary

ProxyFileSystem was missing this override.

[JDevlieghere]

LGTM. Thanks Michael!

include/llvm/Support/VirtualFileSystem.h

public:
   }
   std::error_code setCurrentWorkingDirectory(const Twine &Path) override {
     return FS->setCurrentWorkingDirectory(Path);
   }
   std::error_code getRealPath(const Twine &Path,
                               SmallVectorImpl<char> &Output) const override {
     return FS->getRealPath(Path, Output);
   }
+  std::error_code isLocal(const Twine &Path, bool &Result) override {
+    return FS->isLocal(Path, Result);
+  }
 
 protected:
   FileSystem &getUnderlyingFS() { return *FS; }
 
 private:
   IntrusiveRefCntPtr<FileSystem> FS;
 };
 

unittests/Support/VirtualFileSystemTest.cpp

// Make sure we get the top-most entry
     for (; !EC && I != E; I.increment(EC))
       if (I->path() == "/hiddenByMid")
         break;
     ASSERT_NE(E, I);
     EXPECT_EQ(sys::fs::file_type::regular_file, I->type());
   }
 }
 
+TEST(ProxyFileSystemTest, Basic) {
+  IntrusiveRefCntPtr<vfs::InMemoryFileSystem> Base(
+      new vfs::InMemoryFileSystem());
+  vfs::ProxyFileSystem PFS(Base);
+
+  Base->addFile("/a", 0, MemoryBuffer::getMemBuffer("test"));
+
+  auto Stat = PFS.status("/a");
+  ASSERT_FALSE(Stat.getError());
+
+  auto File = PFS.openFileForRead("/a");
+  ASSERT_FALSE(File.getError());
+  EXPECT_EQ("test", (*(*File)->getBuffer("ignored"))->getBuffer());
+
+  std::error_code EC;
+  vfs::directory_iterator I = PFS.dir_begin("/", EC);
+  ASSERT_FALSE(EC);
+  ASSERT_EQ("/a", I->path());
+  I.increment(EC);
+  ASSERT_FALSE(EC);
+  ASSERT_EQ(vfs::directory_iterator(), I);
+
+  ASSERT_FALSE(PFS.setCurrentWorkingDirectory("/"));
+
+  auto PWD = PFS.getCurrentWorkingDirectory();
+  ASSERT_FALSE(PWD.getError());
+  ASSERT_EQ("/", *PWD);
+
+  SmallString<16> Path;
+  ASSERT_FALSE(PFS.getRealPath("a", Path));
+  ASSERT_EQ("/a", Path);
+
+  bool Local = true;
+  ASSERT_FALSE(PFS.isLocal("/a", Local));
+  ASSERT_EQ(false, Local);
+}
+
 class InMemoryFileSystemTest : public ::testing::Test {
 protected:
   llvm::vfs::InMemoryFileSystem FS;
   llvm::vfs::InMemoryFileSystem NormalizedFS;
 
   InMemoryFileSystemTest()
       : FS(/*UseNormalizedPaths=*/false),
         NormalizedFS(/*UseNormalizedPaths=*/true) {}