Poudriere change to distfile cache handling?

[Arthur Chance]

I've been using poudriere (and pkgng) for building and installing ports 
since just before the new year. This morning I started doing a bulk 
build and got

====>> Error: DISTFILES_CACHE cannot be in the portsdir as the portsdir 
will be mounted read-only

I've been using /usr/ports/disfiles as my DISTFILES_CACHE since I 
started with no problem. Anyone know what's going on here?

A quick look at /usr/local/share/poudriere/common.sh shows an explicit 
check for ${DISTFILES_CACHE} being /usr/ports/distfiles, which is what's 
triggering the error, and /usr/ports is mounted ro in the jail, but then 
${DISTFILES_CACHE} is mounted rw on <jail>/usr/ports/distfiles.

Also, the check is specifically for the cache being 
/usr/ports/distfiles, and wouldn't trigger if it were 
/usr/ports/Distfiles, and yet the error message suggests it shouldn't be 
anywhere under /usr/ports.

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