nfs: operation not permitted to change network attribute

[triaxx <triaxx%triaxx.org@localhost>]

Hi,

I experienced a strange behavior when manipulating nfs exports:

# cat /etc/exports
/usr/local/bin           -ro   -maproot=root     -network 192.168.0.0/24
/usr/pkg/etc/letsencrypt       -maproot=root     dns
/usr/pkg/etc/letsencrypt -ro   -maproot=root     mail www

# showmount -e
Exports list on localhost:
/usr/pkg/etc/letsencrypt           dns mail www
/usr/local/bin                     192.168.0.0

I would export the /home directory to my network:

# cat /etc/exports
/home                          -maproot=root     -network 192.168.0.0/24
/usr/local/bin           -ro   -maproot=root     -network 192.168.0.0/24
/usr/pkg/etc/letsencrypt       -maproot=root     dns
/usr/pkg/etc/letsencrypt -ro   -maproot=root     mail www

# showmount -e
/usr/pkg/etc/letsencrypt           dns mail www
/home                              192.168.0.0

/usr/local/bin is no longer exported. If I swap the two first lines of 
my /etc/exports file, /usr/local/bin returns but /home disappears:

# cat /etc/exports
/usr/local/bin           -ro   -maproot=root     -network 192.168.0.0/24
/home                          -maproot=root     -network 192.168.0.0/24
/usr/pkg/etc/letsencrypt       -maproot=root     dns
/usr/pkg/etc/letsencrypt -ro   -maproot=root     mail www

# showmount -e
/usr/pkg/etc/letsencrypt           dns mail www
/usr/local/bin                     192.168.0.0

I looks like a syntax error but I do not see where...

I started mountd in debugging mode to see what it could tell me. For 
/usr/local/bin:

Got line /usr/local/bin           -ro   -maproot=root     -network 
192.168.0.0/24
Making new ep fs=0xa800,0x78b
doing opt -ro   -maproot=root     -network 192.168.0.0/24
doing opt -maproot=root     -network 192.168.0.0/24
doing opt -network 192.168.0.0/24
setting OP_MASKLEN
get_net: '192.168.0.0' v4 addr a8c0

It seems ok, but for /home:

Got line /home                          -maproot=root     -network 
192.168.0.0/24
Found ep fs=0xa800,0x78b
doing opt -maproot=root     -network 192.168.0.0/24
doing opt -network 192.168.0.0/24
setting OP_MASKLEN
get_net: '192.168.0.0' v4 addr a8c0
mountd[19718]: "/home                          -maproot", line 11: Can't 
change attributes for /home to 192.168.0.0: Operation not permitted

Maybe the problem comes from my lack of experience. Buf if not, I could 
try to reproduce this behavior on -current and send a pr if necessary.