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From: Mel <fbsd.questions@rachie.is-a-geek.net>
To: freebsd-questions@freebsd.org
Date: Sun, 25 Jan 2009 17:06:15 -0900
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Cc: Peter Vereshagin <peter@vereshagin.org>
Subject: Re: jail init, but another question
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On Sunday 25 January 2009 02:35:16 Peter Vereshagin wrote:
> Hello,
>
> I always try to set up the devfs ruleset in rc.conf. So my question is
> about this in /etc/defaults/rc.conf: ===
> #jail_example_devfs_ruleset="ruleset_name"      # devfs ruleset to apply to
> jail ===
>
> It appears not to work in /etc/rc.conf without this rc.subr patch:
> ===
> $ diff -u /etc/rc.subr /usr/src/etc/rc.subr
> --- /etc/rc.subr        2008-07-20 19:26:20.000000000 +0500
> +++ /usr/src/etc/rc.subr        2008-05-12 12:29:03.000000000 +0500
> @@ -1242,7 +1242,7 @@
>  devfs_set_ruleset()
>  {
>         local devdir rs _me
> -       [ -n "$1" ] && eval rs=\$1 || rs=
> +       [ -n "$1" ] && eval rs=\$$1 || rs=
>         [ -n "$2" ] && devdir="-m "$2"" || devdir=
>         _me="devfs_set_ruleset"
> ===
>
> And, by far the "ruleset_name" does not work in favour of ruleset number.

your patch broke it. eval rs=\$1 means rs will be set to the literal $1, while 
it should expand to the ruleset number, using the ruleset name, because 
devfs_rulesets_from_file sets:
eval $rulename=\$rulenum

Something else is wrong. Set rc_debug="YES" in /etc/rc.conf then
/etc/rc.d/jail start example

to trace how the rulesets are evaluated.
-- 
Mel

Problem with today's modular software: they start with the modules
    and never get to the software part.