Created attachment 181523 [details]
Please add /dev/full to devfs ruleset devfsrules_unhide_basic, alongside with /dev/null and /dev/zero
/dev/full  is a devices, which returns ENOSPC on write. It is used e. g. in applications regression tests.
Adding /dev/full to devfsrules_unhide_basic will expose this device into jails by default. Given how this device works it should be safe to do.
Having /dev/full in jail by default will simplify running port tests in jails using 'poudriere testport -i'.