Detcrcdinitdrc from the Linux from Scratch by OnWorks

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D.1. /etc/rc.d/init.d/rc‌

The rc script is the first script called by init and initiates the boot process.

#!/bin/bash

########################################################################

# Begin rc

#

# Description : Main Run Level Control Script

#

# Authors : Gerard Beekmans - [email protected]

# : DJ Lucas - [email protected]

# Update : Bruce Dubbs - [email protected]

#

# Version : LFS 7.0

#

########################################################################

. /lib/lsb/init-functions print_error_msg()

{

log_failure_msg

# $i is set when called

MSG="FAILURE:\n\nYou should not be reading this error message.\n\n" MSG="${MSG}It means that an unforeseen error took place in\n" MSG="${MSG}${i},\n"

MSG="${MSG}which exited with a return value of ${error_value}.\n"

MSG="${MSG}If you're able to track this error down to a bug in one of\n" MSG="${MSG}the files provided by the ${DISTRO_MINI} book,\n" MSG="${MSG}please be so kind to inform us at ${DISTRO_CONTACT}.\n" log_failure_msg "${MSG}"

log_info_msg "Press Enter to continue..." wait_for_user

}

check_script_status()

{

# $i is set when called if [ ! -f ${i} ]; then

log_warning_msg "${i} is not a valid symlink." SCRIPT_STAT="1"

fi

if [ ! -x ${i} ]; then

log_warning_msg "${i} is not executable, skipping." SCRIPT_STAT="1"

fi

}

run()

{

if [ -z $interactive ]; then

${1} ${2}

return $?

fi

while true; do

read -p "Run ${1} ${2} (Yes/no/continue)? " -n 1 runit echo

case ${runit} in c | C)

interactive=""

${i} ${2}

ret=${?} break;

;;

n | N)

return 0

;;

y | Y)

${i} ${2}

ret=${?} break

;;

esac done

return $ret

}

# Read any local settings/overrides

[ -r /etc/sysconfig/rc.site ] && source /etc/sysconfig/rc.site

DISTRO=${DISTRO:-"Linux From Scratch"}

DISTRO_CONTACT=${DISTRO_CONTACT:-"[email protected] (Registration required)"} DISTRO_MINI=${DISTRO_MINI:-"LFS"}

IPROMPT=${IPROMPT:-"no"}

# These 3 signals will not cause our script to exit trap "" INT QUIT TSTP

[ "${1}" != "" ] && runlevel=${1}

if [ "${runlevel}" == "" ]; then echo "Usage: ${0} <runlevel>" >&2 exit 1

fi

previous=${PREVLEVEL}

[ "${previous}" == "" ] && previous=N

if [ ! -d /etc/rc.d/rc${runlevel}.d ]; then

log_info_msg "/etc/rc.d/rc${runlevel}.d does not exist.\n" exit 1

fi

if [ "$runlevel" == "6" -o "$runlevel" == "0" ]; then IPROMPT="no"; fi

# Note: In ${LOGLEVEL:-7}, it is ':' 'dash' '7', not minus 7 if [ "$runlevel" == "S" ]; then

[ -r /etc/sysconfig/console ] && source /etc/sysconfig/console dmesg -n "${LOGLEVEL:-7}"

fi

if [ "${IPROMPT}" == "yes" -a "${runlevel}" == "S" ]; then

# The total length of the distro welcome string, without escape codes wlen=${wlen:-$(echo "Welcome to ${DISTRO}" | wc -c )} welcome_message=${welcome_message:-"Welcome to ${INFO}${DISTRO}${NORMAL}"}

# The total length of the interactive string, without escape codes ilen=${ilen:-$(echo "Press 'I' to enter interactive startup" | wc -c )}

i_message=${i_message:-"Press '${FAILURE}I${NORMAL}' to enter interactive startup"}

# dcol and icol are spaces before the message to center the message

# on screen. itime is the amount of wait time for the user to press a key wcol=$(( ( ${COLUMNS} - ${wlen} ) / 2 ))

icol=$(( ( ${COLUMNS} - ${ilen} ) / 2 )) itime=${itime:-"3"}

echo -e "\n\n"

echo -e "\\033[${wcol}G${welcome_message}" echo -e "\\033[${icol}G${i_message}${NORMAL}" echo ""

read -t "${itime}" -n 1 interactive 2>&1 > /dev/null

fi

# Make lower case

[ "${interactive}" == "I" ] && interactive="i" [ "${interactive}" != "i" ] && interactive=""

# Read the state file if it exists from runlevel S

[ -r /var/run/interactive ] && source /var/run/interactive

# Attempt to stop all services started by the previous runlevel,

# and killed in this runlevel

if [ "${previous}" != "N" ]; then

for i in $(ls -v /etc/rc.d/rc${runlevel}.d/K* 2> /dev/null) do

check_script_status

if [ "${SCRIPT_STAT}" == "1" ]; then SCRIPT_STAT="0"

continue

fi

suffix=${i#/etc/rc.d/rc$runlevel.d/K[0-9][0-9]} prev_start=/etc/rc.d/rc$previous.d/S[0-9][0-9]$suffix sysinit_start=/etc/rc.d/rcS.d/S[0-9][0-9]$suffix

if [ "${runlevel}" != "0" -a "${runlevel}" != "6" ]; then

if [ ! -f ${prev_start} -a ! -f ${sysinit_start} ]; then MSG="WARNING:\n\n${i} can't be "

MSG="${MSG}executed because it was not " MSG="${MSG}not started in the previous " MSG="${MSG}runlevel (${previous})." log_warning_msg "$MSG"

continue

fi

run ${i} stop error_value=${?}

if [ "${error_value}" != "0" ]; then print_error_msg; fi done

fi

if [ "${previous}" == "N" ]; then export IN_BOOT=1; fi

if [ "$runlevel" == "6" -a -n "${FASTBOOT}" ]; then touch /fastboot

fi

# Start all functions in this runlevel

for i in $( ls -v /etc/rc.d/rc${runlevel}.d/S* 2> /dev/null) do

if [ "${previous}" != "N" ]; then suffix=${i#/etc/rc.d/rc$runlevel.d/S[0-9][0-9]} stop=/etc/rc.d/rc$runlevel.d/K[0-9][0-9]$suffix prev_start=/etc/rc.d/rc$previous.d/S[0-9][0-9]$suffix

[ -f ${prev_start} -a ! -f ${stop} ] && continue

fi

check_script_status

if [ "${SCRIPT_STAT}" == "1" ]; then SCRIPT_STAT="0"

continue

fi

case ${runlevel} in 0|6)

run ${i} stop

;;

*)

esac

run ${i} start