Is unionfs usable on -CURRENT?

[Gary Palmer]

On Wed, Jun 06, 2018 at 04:14:35PM +0300, Lev Serebryakov wrote:
> 
>  "man mount_unionfs" is very scary. Is is still true? Maybe, here are
> some other workarounds to have one directory with static data on R/O FS
> and transient data on R/W FS?
> 
>  Unfortunately, "net-mgmt/unifi5" want to put all working data directly
> to its installation directory, which resides on R/O FS of NanoBSD image.

I believe the warnings are still at least partly true.  The usual
suggestion is to use "mount -o union" instead of "mount -t unionfs".
"mount -o union" doesn't have the unionfs issues

Regards,

Gary