[scponly] how does scponly determine the writeable, incoming directory ?

[Ensel Sharon]

Paul,

First, thank you so much for your help - I really appreciate it and know
you have better things to do than this ...and I am sorry I am being so
dense about this, but I _still_ do not see where scponlyc derives the name
of the writeable incoming directory from.

Let me show you why I am confused about this:

I used setup-chroot.sh and used _all defaults_.  No errors, and all
looks well.  After doing so:

# strings /home/user/etc/pwd.db|grep incoming
#
# cat /etc/passwd|grep incoming
#

So that is all I am asking.  Where does scponlyc derive the name of the
writeable directory from ?  It is not in the chrooted password database,
and it is not in the base password file.  As far as I can tell it is
nowhere.