fuse/ipns: Only change file size in Setattr if asked to

This used to cause files e.g. being edited with `vi` to become 0-size.

License: MIT
Signed-off-by: Tommi Virtanen <tv@eagain.net>

fuse/ipns/ipns_unix.go

@@ -335,6 +335,7 @@ func (fi *File) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 }
 
 func (fi *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *fuse.SetattrResponse) error {
+	if req.Valid.Size() {
 		cursize, err := fi.fi.Size()
 		if err != nil {
 			return err
@@ -345,6 +346,7 @@ func (fi *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *fus
 				return err
 			}
 		}
+	}
 	return nil
 }