syscallcompat: convert Getdents to fd input, add emulation

Now that we have Fstatat we can use it in Getdents to
get rid of the path name.

Also, add an emulated version of getdents for MacOS. This allows
to drop the !HaveGetdents special cases from fusefrontend.

Modify the getdents test to test both native getdents and the emulated
version.

1 files changed, 7 insertions, 0 deletions

diff --git a/internal/syscallcompat/sys_linux.go b/internal/syscallcompat/sys_linux.go
index fb8d8b3..b5b949e 100644
--- a/internal/syscallcompat/sys_linux.go
+++ b/internal/syscallcompat/sys_linux.go
@@ -7,6 +7,8 @@ import (
 
 	"golang.org/x/sys/unix"
 
+	"github.com/hanwen/go-fuse/fuse"
+
 	"github.com/rfjakob/gocryptfs/internal/tlog"
 )
 
@@ -115,3 +117,8 @@ func Fstatat(dirfd int, path string, stat *unix.Stat_t, flags int) (err error) {
 	}
 	return unix.Fstatat(dirfd, path, stat, flags)
 }
+
+// Getdents syscall.
+func Getdents(fd int) ([]fuse.DirEntry, error) {
+	return getdents(fd)
+}