D.1. /etc/rc.d/init.d/rc

#### Linux From Scratch - Version 11.3-rc1

### Appendix D. Boot and sysconfig scripts version-20230101

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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  - gerard@linuxfromscratch.org
    #             : DJ Lucas - dj@linuxfromscratch.org
    # Updates     : Bruce Dubbs - bdubbs@linuxfromscratch.org
    #             : Pierre Labastie - pierre@linuxfromscratch.org
    #
    # Version     : LFS 7.0
    #
    # Notes       : Updates March 24th, 2022: new semantics of S/K files
    #               - Instead of testing that S scripts were K scripts in the
    #                 previous runlevel, test that they were not S scripts
    #               - Instead of testing that K scripts were S scripts in the
    #                 previous runlevel, test that they were not K scripts
    #               - S scripts in runlevel 0 or 6 are now run with
    #                "script start" (was "script stop" previously).
    ########################################################################

    . /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:-"lfs-dev@lists.linuxfromscratch.org (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 /run/interactive ] && source /run/interactive

    # Stop all services marked as K, except if marked as K in the previous
    # runlevel: it is the responsibility of the script to not try to kill
    # a non running service
    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]}
          [ -e /etc/rc.d/rc${previous}.d/K[0-9][0-9]$suffix ] && continue

          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 services marked as S in this runlevel, except if marked as
    # S in the previous runlevel
    # it is the responsibility of the script to not try to start an already running
    # service
    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${runlevel}.d/S[0-9][0-9]}
          [ -e /etc/rc.d/rc${previous}.d/S[0-9][0-9]$suffix ] && continue
       fi

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

       run ${i} start

       error_value=${?}

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

    # Store interactive variable on switch from runlevel S and remove if not
    if [ "${runlevel}" == "S" -a "${interactive}" == "i" ]; then
        echo "interactive=\"i\"" > /run/interactive
    else
        rm -f /run/interactive 2> /dev/null
    fi

    # Copy the boot log on initial boot only
    if [ "${previous}" == "N" -a  "${runlevel}" != "S" ]; then
       cat $BOOTLOG >> /var/log/boot.log

       # Mark the end of boot
       echo "--------" >> /var/log/boot.log

       # Remove the temporary file
       rm -f $BOOTLOG 2> /dev/null
    fi

    # End rc

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