Date: Tue, 21 Sep 2004 12:36:47 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Markie <mark.cullen@dsl.pipex.com> Cc: freebsd-questions@freebsd.org Subject: Re: reload rc.conf during boot process Message-ID: <20040921093647.GC4451@orion.daedalusnetworks.priv> In-Reply-To: <01bb01c49f69$48c66300$f800000a@laptop> References: <01bb01c49f69$48c66300$f800000a@laptop>
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On 2004-09-21 00:26, Markie <mark.cullen@dsl.pipex.com> wrote:
> Is it possible to do this somehow?
>
> I was trying my hand out at C and made a cool little menu for myself. It
> looks for files in /etc/ which are named rc.conf.xxxxx and lists them in
> the menu. Then, when you select one on boot, it copies the selected
> configuration file to rc.conf. I put my program in... the rc.d mount
> script, so that the disk is mounted writeable at the time and my C program
> is able to issue cp (bad way I know) to replace rc.conf. After running my
> program in the rc.d mount script I then did a
>
> . /etc/rc.conf
>
> but rc.conf doesn't get reloaded. The file is being copied over, as when I
> reboot it starts using the copied over configuration. I am not sure if .
> /etc/rc.conf is supposed to load a file in? I just saw it in some other
> script and assumed that's what it was doing.
The /etc/rc script is a ``driver script'' that loads rc.conf before teh
mount script has a chance to run. Even if you reload rc.conf in the
mountd script this cannot affect the parent process that runs /etc/rc.
I believe a good way to do this would be to add a special script in
/etc/rc.d that depends on mountcritlocal that can give you the rc.conf
selection menu and then hack /etc/rc to reload rc.conf if this special
script runs and does indeed change `/etc/rc.conf'.
For instance, if you called your special rc.d script that presents the
rc.conf selection menu ``selectcf'' and saved it in /etc/rc.d, then you
could use something like this in /etc/rc to make sure it rereads rc.conf
if changes are made to rc.conf:
% Index: rc
% ===================================================================
% RCS file: /home/ncvs/src/etc/rc,v
% retrieving revision 1.333
% diff -u -r1.333 rc
% --- rc 24 Jul 2004 16:30:31 -0000 1.333
% +++ rc 21 Sep 2004 09:34:08 -0000
% @@ -71,7 +71,20 @@
% files=`rcorder -k ${os} ${skip} /etc/rc.d/* 2>/dev/null`
%
% for _rc_elem in ${files}; do
% - run_rc_script ${_rc_elem} ${_boot}
% + case ${_rc_elem} in
% + /etc/rc.d/selectcf)
% + _sum_before=`md5 /etc/rc.conf`
% + run_rc_script ${_rc_elem} ${_boot}
% + _sum_after=`md5 /etc/rc.conf`
% + if [ ! "${_sum_before}" = "${_sum_after}" ]; then
% + unset _rc_conf_loaded
% + load_rc_config 'XXX'
% + fi
% + ;;
% + *)
% + run_rc_script ${_rc_elem} ${_boot}
% + ;;
% + esac
% done
%
% echo ''
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