[Bug 218412] add /dev/full to devfsrules_unhide_basic

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218412

            Bug ID: 218412
           Summary: add /dev/full to devfsrules_unhide_basic
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: conf
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: citrin+pr at citrin.ru

Created attachment 181523
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=181523&action=edit
Add /dev/full

Please add /dev/full to devfs ruleset devfsrules_unhide_basic, alongside with
/dev/null and /dev/zero

/dev/full [1] 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'.

[1] https://lists.freebsd.org/pipermail/svn-src-all/2014-April/084195.html

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