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Linux From Scratch: Creating system boot scripts Next Previous Contents

8. Creating system boot scripts

These bootscripts are started at system boot time. The scripts are responsible for mounting the root file system in read-write mode, activating swap, setting up some system settings and starting the various daemons that our system needs.
8.1 Preparing the directories and master files

You need the Sysvinit package again for this section.

Create the necessary directories by running:

cd /etc mkdir rc0.d rc1.d rc2.d rc3.d rc4.d rc5.d rc6.d init.d rcS.d

Go to the unpacked Sysvinit source directory

Copy the Debian/etc/init.d/rc file to: /etc/init.d

Go to the /etc/init.d directory

Create a new file rcS containing the following:

#!/bin/sh # Begin /etc/init.d/rcS runlevel=S prevlevel=N umask 022 export runlevel prevlevel trap ":" INT QUIT TSTP for i in /etc/rcS.d/S??* do [ ! -f "$i" ] && continue; $i start done # End /etc/init.d/rcS

8.2 Creating the reboot script

Create a new file reboot containing the following:

#!/bin/sh # Begin /etc/init.d/reboot echo -n "System reboot in progress..." /sbin/reboot -d -f -i # End /etc/init.d/reboot

8.3 Creating the halt script

Create a new file halt containing the following:

#!/bin/sh # Begin /etc/init.d/halt /sbin/halt -d -f -i -p # End /etc/init.d/halt

8.4 Creating the mountfs script

Create a new file mountfs containing the following:

#!/bin/sh # Begin /etc/init.d/mountfs check_status() { if [ $? = 0 ] then echo "OK" else echo "FAILED" fi } echo -n "Remounting root file system in read-write mode..." /bin/mount -n -o remount,rw / check_status > /etc/mtab /bin/mount -f -o remount,rw / echo -n "Mounting proc file system..." /bin/mount proc check_status # End /etc/init.d/mountfs

8.5 Creating the umountfs script

Create a new file umountfs containing the following:

#!/bin/sh # Begin /etc/init.d/umountfs check_status() { if [ $? = 0 ] then echo "OK" else echo "FAILED" fi } echo "Deactivating swap..." /bin/swapoff -av check_status echo -n "Unmounting file systems..." /bin/umount -a -r check_status # End /etc/init.d/umountfs

8.6 Creating the sendsignals script

Create a new file sendsignals containing the following:

#!/bin/sh # Begin /etc/init.d/sendsignals check_status() { if [ $? = 0 ] then echo "OK" else echo "FAILED" fi } echo -n "Sending all processes the TERM signal..." /sbin/killall5 -15 check_status echo -n "Sending all processes the KILL signal..." /sbin/killall5 -9 check_status

8.7 Creating the checkroot bootscript

Create a file /etc/init.d/checkroot containing the following:

#!/bin/sh # Begin /etc/init.d/checkroot echo "Activating swap..." /sbin/swapon -av if [ -f /fastboot ] then echo "Fast boot, no file system check" else /bin/mount -n -o remount,ro / if [ $? = 0 ] then if [ -f /forcecheck ] then force="-f" else force="" fi echo "Checking root file system..." /sbin/fsck $force -a / if [ $? -gt 1 ] then echo echo "fsck failed. Please repair your file system manually by" echo "running fsck without the -a option" echo "Please note that the file system is currently mounted in" echo "read-only mode." echo echo "I will start sulogin now. CTRL+D will reboot your system." /sbin/sulogin /reboot -f fi else echo "Cannot check root file system because it is not mounted in" echo "read-only mode." fi fi # End /etc/init.d/checkroot

8.8 Creating the Sysklogd bootscript

Create a new file /etc/init.d/sysklogd containing the following:

#!/bin/sh # Begin /etc/init.d/sysklogd check_status() { if [ $? = 0 ] then echo "OK" else echo "FAILED" fi } case "$1" in start) echo -n "Starting system log daemon..." start-stop-daemon -S -q -o -x /usr/sbin/syslogd -- -m 0 check_status echo -n "Starting kernel log daemon..." start-stop-daemon -S -q -o -x /usr/sbin/klogd check_status ;; stop) echo -n "Stopping kernel log daemon..." start-stop-daemon -K -q -o -p /var/run/klogd.pid check_status echo -n "Stopping system log daemon..." start-stop-daemon -K -q -o -p /var/run/syslogd.pid check_status ;; reload) echo -n "Reloading system load daemon configuration file..." start-stop-daemon -K -q -o -s 1 -p /var/run/syslogd.pid check_status ;; restart) echo -n "Stopping kernel log daemon..." start-stop-daemon -K -q -o -p /var/run/klogd.pid check_status echo -n "Stopping system log daemon..." start-stop-daemon -K -q -o -p /var/run/syslogd.pid check_status sleep 1 echo -n "Starting system log daemon..." start-stop-daemon -S -q -o -x /usr/sbin/syslogd -- -m 0 check_status echo -n "Starting kernel log daemon..." start-stop-daemon -S -q -o -x /usr/sbin/klogd check_status ;; *) echo "Usage: $0 {start|stop|reload|restart}" exit 1 ;; esac # End /etc/init.d/sysklogd

8.9 Setting up symlinks and permissions

Set the proper file permissions and symlinks by running:

chmod 755 rcS reboot halt mountfs umountfs sendsignals checkroot sysklogd cd ../rc0.d ln -s ../init.d/sysklogd K90sysklogd ln -s ../init.d/sendsignals S80sendsignals ln -s ../init.d/umountfs S90umountfs ln -s ../init.d/halt S99halt cd ../rc6.d ln -s ../init.d/sysklogd K90sysklogd ln -s ../init.d/sendsignals S80sendsignals ln -s ../init.d/umountfs S90umountfs ln -s ../init.d/reboot S99reboot cd ../rcS.d ln -s ../init.d/checkroot S05checkroot ln -s ../init.d/mountfs S10mountfs cd /etc/rc2.d ln -s ../init.d/sysklogd S03sysklogd

8.10 Creating the /etc/fstab file

Create a file /etc/fstab containing the following:

/dev/<LFS-partition designation> / ext2 defaults 0 1 /dev/<swap-partition designation> none swap sw 0 0 proc /proc proc defaults 0 0

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