Re: [PATCH] Overriding rc.conf in loader

> From: Marcin Wisnicki <mwisnicki+freebsd_at_gmail.com>
> Date: Sun, 4 Nov 2007 20:50:03 +0000 (UTC)
> Sender: owner-freebsd-current_at_freebsd.org
> 
> On Sun, 04 Nov 2007 12:40:45 -0500, 韓家標 Bill Hacker wrote:
> 
> > Marcin Wisnicki wrote:
> >> Hi
> >> 
> >> I thought it would be nice if there was a way to override rc.conf
> >> variables during boot. Proposed patch implements this using kenv.
> >> 
> >> With it, you can override any rc variable from loader.conf by prefixing
> >> its name with 'rc.', some useful examples:
> >> 
> > Pardon my stupidity... but does this over-ride over rides with other
> > over rides...
> > 
> > or what?
> 
> Pretty much, yes. Assuming I didn't overlook something, the order of
> assignment is following:
> 
> 1. suck in /etc/defaults/rc.conf
> 2. try to set $rc_conf_files from kenv rc.rc_conf_files [*]
>    otherwise leave it as defined in defaults
> 3. source $rc_conf_files
> 4. source /etc/rc.conf.d/$name_of_script
> 5. for each kenv variable named rc.$var set $var [*]
> 
> lines marked by [*] are added by my patch
> 
> > 
> > ..and if so, ISTR there may be a better way already...
> > 
> 
> Not that I know of.

While I'm sure many will question the value of this if they use FreeBSD
only on servers, I think it is of some value for desktops and
substantial value for laptops where the environment is always changing.

For example, I might want to change network configuration or shutdown
the Bluetooth and WiFi when flying.
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman_at_es.net			Phone: +1 510 486-8634
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