Date: Sun, 04 Nov 2007 22:19:36 -0500 From: =?UTF-8?B?6Z+T5a625qiZIEJpbGwgSGFja2Vy?= <askbill@conducive.net> To: freebsd-current@freebsd.org Subject: Re: [PATCH] Overriding rc.conf in loader Message-ID: <472E8BC8.5050606@conducive.net> In-Reply-To: <20071104224615.2EA9145010@ptavv.es.net> References: <20071104224615.2EA9145010@ptavv.es.net>
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Kevin Oberman wrote:
>> From: Marcin Wisnicki <mwisnicki+freebsd@gmail.com>
>> Date: Sun, 4 Nov 2007 20:50:03 +0000 (UTC)
>> Sender: owner-freebsd-current@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.
Clearly a need for that. This PowerBook 17" has 'many' round the world trips on
it, as does the '96 vintage Kapok that preceeded it, and a 486-class Thinkpad
before that.
At the end of the day those toggles should be no more difficult w/o reboot on
FreeBSD than they are on OS X ('nuf said..) or were even on OS/2 // eCS (swap
config.sys w/o 'apparent' reboot).
And most are NOT more difficult. In nay case, I don't know that the proposed
patch is particularly relevant to that need.
Mind - I like the concept.
My pet 'hot button' the BSD box that comes up to sshd, quasi-multi, and with a
usable 'fix the fat fingered comma fault' editor.
And 'mined' - static compiled into /bin - is nice to have even if I *am* within
arm's length.
;-)
Bill
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