'poudriere jail -u' pulls in /usr/src

[Beeblebrox]

My build jail has in poudriere.d/jails/<name>:
arch-amd64, method-src=/asp/git/src, srcpath-/asp/git/src

The jail was created with the (-S) flag & srcpath mounts <jail>/usr/src
on start as expected. On running the update option however, poudriere
tries to copy the whole source tree into <jail>/usr/src, which is
unexpected and breaks precedent behavior (no -b being passed)
# poudriere jail -u -j <name> -m src=/asp/git/src (same with no -m)
[00:00:00] ====>> Upgrading using src=/asp/git/src
[00:00:00] ====>> Copying /asp/git/src to /asp/jails/<name>/usr/src...

For the time being I'm updating the jail by method
make installworld (& distribution) DESTDIR=$PATH DB_FROM_SRC=1

poudriere version 3.1.99.20170516
Regards
-- 
FreeBSD_amd64_12-Current_RadeonKMS
Please CC my email when responding, mail from list is not delivered.