@CompileStatic
class UnitTestPreconditions {

    static final class Symlinks implements TestPrecondition {
        @Override
        boolean isSatisfied() {
            return satisfied(MacOs) || satisfied(Linux)
        }
    }

    static final class NoSymlinks implements TestPrecondition {
        @Override
        boolean isSatisfied() {
            return notSatisfied(Symlinks)
        }
    }

        when:
        run "copy"
        then:
        file("build/tmp/testchild").mode == mode
        where:
        mode << [0755, 0776]
    }

    @Requires(UnitTestPreconditions.Symlinks)
    def "symlinked file permissions are preserved in copy action"() {
        given:
        def mode = 0746
        def testSourceFile = file(testFileName)
        testSourceFile << "test file content"

			if err != nil && os.IsNotExist(err) {
				t.Fatalf("%v: visible symlink does not exist: %v", tc.name, visiblePath)
			} else if err != nil {
				t.Fatalf("%v: unable to read symlink %v: %v", tc.name, dataDirPath, err)
			}

			if expectedDest != destination {
				t.Fatalf("%v: symlink destination %q not same with expected data dir %q", tc.name, destination, expectedDest)
			}
		}
	}
}

//sysnb	Settimeofday(tp *Timeval) (err error)
//sysnb	Setuid(uid int) (err error)
//sys	Stat(path string, stat *Stat_t) (err error)
//sys	Statfs(path string, stat *Statfs_t) (err error)
//sys	Symlink(path string, link string) (err error)
//sys	Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
//sys	Sync() (err error)
//sys	Truncate(path string, length int64) (err error)
//sys	Umask(newmask int) (oldmask int)

//sysnb	Settimeofday(tp *Timeval) (err error)
//sysnb	Setuid(uid int) (err error)
//sys	Stat(path string, stat *Stat_t) (err error)
//sys	Statfs(path string, stat *Statfs_t) (err error)
//sys	Symlink(path string, link string) (err error)
//sys	Symlinkat(oldpath string, newdirfd int, newpath string) (err error)
//sys	Sync() (err error)
//sys	Truncate(path string, length int64) (err error)
//sys	Umask(newmask int) (oldmask int)

func (hu *HostUtil) PathExists(pathname string) (bool, error) {
	return utilpath.Exists(utilpath.CheckFollowSymlink, pathname)
}

// EvalHostSymlinks returns the path name after evaluating symlinks.
// TODO once the nsenter implementation is removed, this method can be removed
// from the interface and filepath.EvalSymlinks used directly
func (hu *HostUtil) EvalHostSymlinks(pathname string) (string, error) {

			}

			// Depending on what was passed on the command line, it is possible
			// that os.Executable is a symlink (like /usr/local/bin/go) referring
			// to a binary installed in a real GOROOT elsewhere
			// (like /usr/lib/go/bin/go).
			// Try to find that GOROOT by resolving the symlinks.
			exe, err = filepath.EvalSymlinks(exe)
			if err == nil {
				if dir := filepath.Join(exe, "../.."); isGOROOT(dir) {

		default:
			paths = append(paths, filepath.Join(root, d))
		}
	}
	return strings.Join(paths, string(os.PathListSeparator))
}

// installProgs creates executable files (or symlinks to executable files) at
// multiple destination paths. It uses root as prefix for all destination files.
func installProgs(t *testing.T, root string, files []string) {
	for _, f := range files {

	dir, err := f.Stat()
	if err != nil {
		t.Fatalf("stat %s: %s", f.Name(), err)
	}

	linkname := f.Name() + "2"
	if err := Symlink(f.Name(), linkname); err != nil {
		if runtime.GOOS == "android" && IsPermission(err) {
			t.Skip("skipping test on Android; permission error creating symlink")
		}
		t.Fatalf("link %s -> %s: %v", f.Name(), linkname, err)
	}
	defer Remove(linkname)

			if f.Sym.Uniq() {
				continue
			}
			f.Sym.SetUniq(true)
			slist = append(slist, symlink{field: f})
		}

		return
	}

	u = types.ReceiverBaseType(t)
	if u != nil {
		for _, f := range u.Methods() {
			if f.Sym.Uniq() {
				continue
			}
			f.Sym.SetUniq(true)
			slist = append(slist, symlink{field: f})
		}
	}
}

func expand1(t *types.Type, top bool) {
	if t.Recur() {