Revert "syscallcompat: drop Faccessat AT_SYMLINK_NOFOLLOW helper"

Breaks mounting on MacOS: unix.Faccessat on Darwin does NOT (yet)
support AT_SYMLINK_NOFOLLOW. See d44fe89ba4f3252c5bd00c4f7730197732f2a26a .

This reverts commit 0805a63df1b5f915b228727f6074c2506922d0ad.

2 files changed, 11 insertions, 10 deletions

diff --git a/internal/fusefrontend/fs.go b/internal/fusefrontend/fs.go
index decd13f..096e663 100644
--- a/internal/fusefrontend/fs.go
+++ b/internal/fusefrontend/fs.go
@@ -626,7 +626,7 @@ func (fs *FS) Access(relPath string, mode uint32, context *fuse.Context) (code f
 	if err != nil {
 		return fuse.ToStatus(err)
 	}
-	err = unix.Faccessat(dirfd, cName, mode, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, mode)
 	syscall.Close(dirfd)
 	return fuse.ToStatus(err)
 }
diff --git a/internal/fusefrontend/openbackingdir_test.go b/internal/fusefrontend/openbackingdir_test.go
index 9c2358e..82cc74d 100644
--- a/internal/fusefrontend/openbackingdir_test.go
+++ b/internal/fusefrontend/openbackingdir_test.go
@@ -7,6 +7,7 @@ import (
 
 	"golang.org/x/sys/unix"
 
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
 	"github.com/rfjakob/gocryptfs/tests/test_helpers"
 )
 
@@ -45,11 +46,11 @@ func TestOpenBackingDir(t *testing.T) {
 		t.Fatal("cName should be .")
 	}
 
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
-	err = unix.Faccessat(dirfd, ".", unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, ".", unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -62,7 +63,7 @@ func TestOpenBackingDir(t *testing.T) {
 	if cName == "" {
 		t.Fatal("cName should not be empty")
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -75,7 +76,7 @@ func TestOpenBackingDir(t *testing.T) {
 	if cName == "" {
 		t.Fatal("cName should not be empty")
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -94,7 +95,7 @@ func TestOpenBackingDir(t *testing.T) {
 	if len(cName) >= 255 {
 		t.Fatalf("cName is too long: %q", cName)
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -125,11 +126,11 @@ func TestOpenBackingDirPlaintextNames(t *testing.T) {
 	if cName != "." {
 		t.Fatal("cName should be .")
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
-	err = unix.Faccessat(dirfd, ".", unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, ".", unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -142,7 +143,7 @@ func TestOpenBackingDirPlaintextNames(t *testing.T) {
 	if cName != "dir1" {
 		t.Fatalf("wrong cName: %q", cName)
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}
@@ -155,7 +156,7 @@ func TestOpenBackingDirPlaintextNames(t *testing.T) {
 	if cName != "dir2" {
 		t.Fatalf("wrong cName: %q", cName)
 	}
-	err = unix.Faccessat(dirfd, cName, unix.R_OK, unix.AT_SYMLINK_NOFOLLOW)
+	err = syscallcompat.Faccessat(dirfd, cName, unix.R_OK)
 	if err != nil {
 		t.Error(err)
 	}