tests: convert Creat() calls to Open()

Creat() is equivalent to Open(..., O_CREAT|O_WRONLY|O_TRUNC, ...)
and MacOS does not have syscall.Creat().

https://github.com/rfjakob/gocryptfs/issues/623

tests/cli/cli_test.go

@@ -982,7 +982,7 @@ func TestMountCreat(t *testing.T) {
 		for i := 0; i < concurrency; i++ {
 			go func(i int) {
 				path := fmt.Sprintf("%s/%d", mnt, i)
-				fd, err := syscall.Creat(path, 0600)
+				fd, err := syscall.Open(path, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
 				syscall.Close(fd)
 				if err != nil {
 					t.Errorf("Creat %q: %v", path, err)

tests/defaults/main_test.go

@@ -401,7 +401,7 @@ func TestMaxlen(t *testing.T) {
 
 func TestFsync(t *testing.T) {
 	fileName := test_helpers.DefaultPlainDir + "/" + t.Name() + ".file"
-	fileFD, err := syscall.Creat(fileName, 0600)
+	fileFD, err := syscall.Open(fileName, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -447,7 +447,7 @@ func TestForceOwner(t *testing.T) {
 	// In the answer to a FUSE CREATE, gocryptfs sends file information including
 	// the owner. This is cached by the kernel and will be used for the next
 	// stat() call.
-	fd, err := syscall.Creat(foo, 0666)
+	fd, err := syscall.Open(foo, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_EXCL, 0666)
 	if err != nil {
 		t.Fatal(err)
 	}

tests/matrix/concurrency_test.go

@@ -144,7 +144,7 @@ func TestInoReuse(t *testing.T) {
 	wg.Add(1)
 	go func() {
 		for i := 0; i < 1000; i++ {
-			fd, err := syscall.Creat(fn, 0600)
+			fd, err := syscall.Open(fn, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
 			if err == syscall.EISDIR {
 				continue
 			}

tests/plaintextnames/plaintextnames_test.go

@@ -116,7 +116,7 @@ func TestInoReuseEvil(t *testing.T) {
 		}
 		// create a new file that will likely get the same inode number
 		pPath2 := pPath + "2"
-		fd, err := syscall.Creat(pPath2, 0600)
+		fd, err := syscall.Open(pPath2, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
 		if err != nil {
 			t.Fatal(err)
 		}

tests/root_test/root_test.go

@@ -120,7 +120,7 @@ func writeTillFull(t *testing.T, path string) (int, syscall.Errno) {
 	runtime.LockOSThread()
 	defer runtime.UnlockOSThread()
 
-	fd, err := syscall.Creat(path, 0600)
+	fd, err := syscall.Open(path, syscall.O_CREAT|syscall.O_WRONLY|syscall.O_TRUNC, 0600)
 	if err != nil {
 		return 0, err.(syscall.Errno)
 	}

tests/sharedstorage/sharedstorage_test.go

@@ -77,7 +77,7 @@ func TestDirUnlink(t *testing.T) {
 	if err := unix.Rmdir(tc.mnt2 + "/foo"); err != nil {
 		t.Fatal(err)
 	}
-	if fd, err := unix.Creat(tc.mnt2+"/foo", 0600); err != nil {
+	if fd, err := unix.Open(tc.mnt2+"/foo", unix.O_CREAT|unix.O_WRONLY|unix.O_TRUNC, 0600); err != nil {
 		t.Fatal(err)
 	} else {
 		unix.Close(fd)
@@ -104,7 +104,7 @@ func TestStaleHardlinks(t *testing.T) {
 	defer tc.cleanup()
 
 	link0 := tc.mnt1 + "/link0"
-	if fd, err := unix.Creat(link0, 0600); err != nil {
+	if fd, err := unix.Open(link0, unix.O_CREAT|unix.O_WRONLY|unix.O_TRUNC, 0600); err != nil {
 		t.Fatal(err)
 	} else {
 		unix.Close(fd)