freebsd-skq/etc/rc
cperciva 3cc5015bda MFC r258894: Make rc(8) re-source rc.conf upon receipt of SIGALRM.
The rc system aggressively caches the contents of /etc/rc.conf in order to
improve boot performance; this produces arguably astonishing (non-)results
if /etc/rc.conf is modified during the boot process.  This commit provides
a mechanism for explicitly requesting that rc.conf be reloaded.

Approved by:	re (rodrigc)
2013-12-06 20:48:53 +00:00

147 lines
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#!/bin/sh
#
# Copyright (c) 2000-2004 The FreeBSD Project
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# @(#)rc 5.27 (Berkeley) 6/5/91
# $FreeBSD$
#
# System startup script run by init on autoboot
# or after single-user.
# Output and error are redirected to console by init,
# and the console is the controlling terminal.
# Note that almost all of the user-configurable behavior is no longer in
# this file, but rather in /etc/defaults/rc.conf. Please check that file
# first before contemplating any changes here. If you do need to change
# this file for some reason, we would like to know about it.
stty status '^T' 2> /dev/null
# Set shell to ignore SIGINT (2), but not children;
# shell catches SIGQUIT (3) and returns to single user.
#
trap : 2
trap "echo 'Boot interrupted'; exit 1" 3
HOME=/
PATH=/sbin:/bin:/usr/sbin:/usr/bin
export HOME PATH
if [ "$1" = autoboot ]; then
autoboot=yes
_boot="faststart"
rc_fast=yes # run_rc_command(): do fast booting
else
autoboot=no
_boot="quietstart"
fi
dlv=`/sbin/sysctl -n vfs.nfs.diskless_valid 2> /dev/null`
if [ ${dlv:=0} -ne 0 -o -f /etc/diskless ]; then
sh /etc/rc.initdiskless
fi
# Run these after determining whether we are booting diskless in order
# to minimize the number of files that are needed on a diskless system,
# and to make the configuration file variables available to rc itself.
#
. /etc/rc.subr
load_rc_config 'XXX'
# If we receive a SIGALRM, re-source /etc/rc.conf; this allows rc.d
# scripts to perform "boot-time configuration" including enabling and
# disabling rc.d scripts which appear later in the boot order.
trap "_rc_conf_loaded=false; load_rc_config 'XXX'" ALRM
skip="-s nostart"
if [ `/sbin/sysctl -n security.jail.jailed` -eq 1 ]; then
skip="$skip -s nojail"
if [ "$early_late_divider" = "FILESYSTEMS" ]; then
early_late_divider=NETWORKING
fi
if [ `/sbin/sysctl -n security.jail.vnet` -ne 1 ]; then
skip="$skip -s nojailvnet"
fi
fi
# If the firstboot sentinel doesn't exist, we want to skip firstboot scripts.
if ! [ -e ${firstboot_sentinel} ]; then
skip_firstboot="-s firstboot"
fi
# Do a first pass to get everything up to $early_late_divider so that
# we can do a second pass that includes $local_startup directories
#
files=`rcorder ${skip} ${skip_firstboot} /etc/rc.d/* 2>/dev/null`
_rc_elem_done=' '
for _rc_elem in ${files}; do
run_rc_script ${_rc_elem} ${_boot}
_rc_elem_done="${_rc_elem_done}${_rc_elem} "
case "$_rc_elem" in
*/${early_late_divider}) break ;;
esac
done
unset files local_rc
# Now that disks are mounted, for each dir in $local_startup
# search for init scripts that use the new rc.d semantics.
#
case ${local_startup} in
[Nn][Oo] | '') ;;
*) find_local_scripts_new ;;
esac
# The firstboot sentinel might be on a newly mounted filesystem; look for it
# again and unset skip_firstboot if we find it.
if [ -e ${firstboot_sentinel} ]; then
skip_firstboot=""
fi
files=`rcorder ${skip} ${skip_firstboot} /etc/rc.d/* ${local_rc} 2>/dev/null`
for _rc_elem in ${files}; do
case "$_rc_elem_done" in
*" $_rc_elem "*) continue ;;
esac
run_rc_script ${_rc_elem} ${_boot}
done
# Remove the firstboot sentinel, and reboot if it was requested.
if [ -e ${firstboot_sentinel} ]; then
rm ${firstboot_sentinel}
if [ -e ${firstboot_sentinel}-reboot ]; then
rm ${firstboot_sentinel}-reboot
kill -INT 1
fi
fi
echo ''
date
exit 0