Remove symlink specific code from this PR

Removes the symlink specific code as per dotnet#49555 (comment).
This will be reverted (and modified) as per dotnet#49555 (comment) into dotnet#52639.

Author: hamarb123

src/libraries/Common/src/Interop/OSX/Interop.libc.cs

@@ -25,7 +25,5 @@ internal struct AttrList
 
         [DllImport(Libraries.libc, EntryPoint = "setattrlist", SetLastError = true)]
         internal static unsafe extern int setattrlist(string path, AttrList* attrList, void* attrBuf, nint attrBufSize, CULong options);
-
-        internal const uint FSOPT_NOFOLLOW = 0x00000001;
     }
 }

src/libraries/Native/Unix/System.Native/pal_time.c

@@ -33,7 +33,7 @@ int32_t SystemNative_UTimensat(const char* path, TimeSpec* times)
 
     updatedTimes[1].tv_sec = (time_t)times[1].tv_sec;
     updatedTimes[1].tv_nsec = (long)times[1].tv_nsec;
-    while (CheckInterrupted(result = utimensat(AT_FDCWD, path, updatedTimes, AT_SYMLINK_NOFOLLOW)));
+    while (CheckInterrupted(result = utimensat(AT_FDCWD, path, updatedTimes, 0)));
 #else
     struct timeval updatedTimes[2];
     updatedTimes[0].tv_sec = (long)times[0].tv_sec;

src/libraries/System.IO.FileSystem/tests/Base/BaseGetSetTimes.cs

@@ -23,7 +23,6 @@ public abstract class BaseGetSetTimes<T> : FileSystemTest
 
         protected abstract T GetExistingItem();
         protected abstract T GetMissingItem();
-        protected abstract T CreateSymlinkToItem(T item);
 
         protected abstract string GetItemPath(T item);
 
@@ -130,40 +129,6 @@ public void SettingUpdatesPropertiesAfterAnother()
             });
         }
 
-        [Fact]
-        [PlatformSpecific(~(TestPlatforms.Browser | TestPlatforms.Windows))]
-        public void SettingUpdatesPropertiesOnSymlink()
-        {
-            // Browser is excluded as there is only 1 effective time store.
-            
-            // This test makes sure that the times are set on the symlink itself.
-            // It is needed as on OSX for example, the default for most APIs is
-            // to follow the symlink to completion and set the time on that entry
-            // instead (eg. the setattrlist will do this without the flag set).
-            T item = CreateSymlinkToItem(GetExistingItem());
-
-            Assert.All(TimeFunctions(requiresRoundtripping: true), (function) =>
-            {
-                // Checking that milliseconds are not dropped after setter on supported platforms.
-                DateTime dt = new DateTime(2004, 12, 1, 12, 3, 3, LowTemporalResolution ? 0 : 321, function.Kind);
-                function.Setter(item, dt);
-                DateTime result = function.Getter(item);
-                Assert.Equal(dt, result);
-                Assert.Equal(dt.ToLocalTime(), result.ToLocalTime());
-
-                // File and Directory UTC APIs treat a DateTimeKind.Unspecified as UTC whereas
-                // ToUniversalTime treats it as local.
-                if (function.Kind == DateTimeKind.Unspecified)
-                {
-                    Assert.Equal(dt, result.ToUniversalTime());
-                }
-                else
-                {
-                    Assert.Equal(dt.ToUniversalTime(), result.ToUniversalTime());
-                }
-            });
-        }
-
         [Fact]
         public void CanGetAllTimesAfterCreation()
         {

src/libraries/System.IO.FileSystem/tests/Directory/GetSetTimes.cs

@@ -51,13 +51,5 @@ public override IEnumerable<TimeFunction> TimeFunctions(bool requiresRoundtrippi
                 ((path) => Directory.GetLastWriteTimeUtc(path)),
                 DateTimeKind.Utc);
         }
-
-        protected override string CreateSymlinkToItem(string item)
-        {
-            var link = item + ".link";
-            if (Directory.Exists(link)) Directory.Delete(link);
-            if (!MountHelper.CreateSymbolicLink(link, item, true) || !Directory.Exists(link)) throw new Exception("Could not create symlink.");
-            return link;
-        }
     }
 }

src/libraries/System.IO.FileSystem/tests/DirectoryInfo/GetSetTimes.cs

@@ -57,15 +57,5 @@ public override IEnumerable<TimeFunction> TimeFunctions(bool requiresRoundtrippi
                 ((testDir) => testDir.LastWriteTimeUtc),
                 DateTimeKind.Utc);
         }
-
-        protected override DirectoryInfo CreateSymlinkToItem(DirectoryInfo item)
-        {
-            var link = new DirectoryInfo(item.FullName + ".link");
-            if (link.Exists) link.Delete();
-            bool failed = !MountHelper.CreateSymbolicLink(link.FullName, item.FullName, true);
-            link.Refresh();
-            if (failed || !link.Exists) throw new Exception("Could not create symlink.");
-            return link;
-        }
     }
 }

src/libraries/System.IO.FileSystem/tests/File/GetSetTimes.cs

@@ -103,14 +103,6 @@ public override IEnumerable<TimeFunction> TimeFunctions(bool requiresRoundtrippi
                 DateTimeKind.Utc);
         }
 
-        protected override string CreateSymlinkToItem(string item)
-        {
-            var link = item + ".link";
-            if (File.Exists(link)) File.Delete(link);
-            if (!MountHelper.CreateSymbolicLink(link, item, false) || !File.Exists(link)) throw new Exception("Could not create symlink.");
-            return link;
-        }
-
         [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsNotInAppContainer))] // Can't read root in appcontainer
         [PlatformSpecific(TestPlatforms.Windows)]
         public void PageFileHasTimes()

src/libraries/System.IO.FileSystem/tests/FileInfo/GetSetTimes.cs

@@ -103,16 +103,6 @@ public override IEnumerable<TimeFunction> TimeFunctions(bool requiresRoundtrippi
                 DateTimeKind.Utc);
         }
 
-        protected override FileInfo CreateSymlinkToItem(FileInfo item)
-        {
-            var link = new FileInfo(item.FullName + ".link");
-            if (link.Exists) link.Delete();
-            bool failed = !MountHelper.CreateSymbolicLink(link.FullName, item.FullName, false);
-            link.Refresh();
-            if (failed || !link.Exists) throw new Exception("Could not create symlink.");
-            return link;
-        }
-
         [ConditionalFact(nameof(HighTemporalResolution))]
         public void CopyToMillisecondPresent()
         {

src/libraries/System.Private.CoreLib/src/System/IO/FileStatus.OSX.cs

@@ -26,7 +26,7 @@ internal unsafe void SetCreationTime(string path, DateTimeOffset time)
             // setattrlist()", so we fall back to the method used on other unix
             // platforms, otherwise we throw an error if we get one, or invalidate
             // the cache if successful because otherwise it has invalid information.
-            Interop.Error result = (Interop.Error)Interop.libc.setattrlist(path, &attrList, &timeSpec, sizeof(Interop.Sys.TimeSpec), new CULong(Interop.libc.FSOPT_NOFOLLOW));
+            Interop.Error result = (Interop.Error)Interop.libc.setattrlist(path, &attrList, &timeSpec, sizeof(Interop.Sys.TimeSpec), default(CULong));
             if (result == Interop.Error.ENOTSUP)
             {
                 SetCreationTime_StandardUnixImpl(path, time);