1 files changed, 78 insertions, 0 deletions
diff --git a/internal/fusefrontend/xattr_darwin.go b/internal/fusefrontend/xattr_darwin.go
index 8760480..741eb6c 100644
--- a/internal/fusefrontend/xattr_darwin.go
+++ b/internal/fusefrontend/xattr_darwin.go
@@ -3,6 +3,16 @@
 // Package fusefrontend interfaces directly with the go-fuse library.
 package fusefrontend
 
+import (
+	"syscall"
+
+	"golang.org/x/sys/unix"
+
+	"github.com/hanwen/go-fuse/fuse"
+
+	"github.com/rfjakob/gocryptfs/internal/syscallcompat"
+)
+
 func disallowedXAttrName(attr string) bool {
 	return false
 }
@@ -14,3 +24,71 @@ func filterXattrSetFlags(flags int) int {
 
 	return flags &^ XATTR_NOSECURITY
 }
+
+func (fs *FS) getXAttr(relPath string, cAttr string, context *fuse.Context) ([]byte, fuse.Status) {
+	// O_NONBLOCK to not block on FIFOs.
+	fd, err := fs.openBackingFile(relPath, syscall.O_RDONLY|syscall.O_NONBLOCK)
+	if err != nil {
+		return nil, fuse.ToStatus(err)
+	}
+	defer syscall.Close(fd)
+
+	cData, err := syscallcompat.Fgetxattr(fd, cAttr)
+	if err != nil {
+		return nil, fuse.ToStatus(err)
+	}
+
+	return cData, fuse.OK
+}
+
+func (fs *FS) setXAttr(relPath string, cAttr string, cData []byte, flags int, context *fuse.Context) fuse.Status {
+	// O_NONBLOCK to not block on FIFOs.
+	fd, err := fs.openBackingFile(relPath, syscall.O_WRONLY|syscall.O_NONBLOCK)
+	// Directories cannot be opened read-write. Retry.
+	if err == syscall.EISDIR {
+		fd, err = fs.openBackingFile(relPath, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK)
+	}
+	if err != nil {
+		return fuse.ToStatus(err)
+	}
+	defer syscall.Close(fd)
+
+	err = unix.Fsetxattr(fd, cAttr, cData, flags)
+	return fuse.ToStatus(err)
+}
+
+func (fs *FS) removeXAttr(relPath string, cAttr string, context *fuse.Context) fuse.Status {
+	// O_NONBLOCK to not block on FIFOs.
+	fd, err := fs.openBackingFile(relPath, syscall.O_WRONLY|syscall.O_NONBLOCK)
+	// Directories cannot be opened read-write. Retry.
+	if err == syscall.EISDIR {
+		fd, err = fs.openBackingFile(relPath, syscall.O_RDONLY|syscall.O_DIRECTORY|syscall.O_NONBLOCK)
+	}
+	if err != nil {
+		return fuse.ToStatus(err)
+	}
+	defer syscall.Close(fd)
+
+	err = unix.Fremovexattr(fd, cAttr)
+	return fuse.ToStatus(err)
+}
+
+func (fs *FS) listXAttr(relPath string, context *fuse.Context) ([]string, fuse.Status) {
+	// O_NONBLOCK to not block on FIFOs.
+	fd, err := fs.openBackingFile(relPath, syscall.O_RDONLY|syscall.O_NONBLOCK)
+	// On a symlink, openBackingFile fails with ELOOP. Let's pretend there
+	// can be no xattrs on symlinks, and always return an empty result.
+	if err == syscall.ELOOP {
+		return nil, fuse.OK
+	}
+	if err != nil {
+		return nil, fuse.ToStatus(err)
+	}
+	defer syscall.Close(fd)
+
+	cNames, err := syscallcompat.Flistxattr(fd)
+	if err != nil {
+		return nil, fuse.ToStatus(err)
+	}
+	return cNames, fuse.OK
+}