lfs-book-zh_CN/bootscripts/lfs/init.d/cleanfs

#!/bin/sh
########################################################################
# Begin $rc_base/init.d/cleanfs
#
# Description : Clean file system
#
# Authors     : Gerard Beekmans - gerard@linuxfromscratch.org
#
# Version     : 00.00
#
# Notes       :
#
########################################################################

. /etc/sysconfig/rc
. ${rc_functions}

# Function to create files/directory on boot.
create_files() {
	# Read in the configuration file.
	exec 9>&0 < /etc/sysconfig/createfiles
		while read name type perm usr grp dtype maj min junk
		do

			# Ignore comments and blank lines.
       			case "${name}" in
				""|\#*) continue ;;
			esac

			# Ignore existing files.
			if [ ! -e "${name}" ]; then
				# Create stuff based on its type.
				case "${type}" in
					dir)
						mkdir "${name}"
						;;
					file)
						:> "${name}"
						;;
					dev)
						case "${dtype}" in
							char)
								mknod "${name}" c ${maj} ${min}
								;;
							block)
								mknod "${name}" b ${maj} ${min}
								;;
							pipe)
								mknod "${name}" p
								;;
							*) 
								boot_mesg -n "\nUnknown device type: ${dtype}" ${WARNING}
								boot_mesg "" ${NORMAL}
								;;
						esac
						;;
					*)
						boot_mesg -n "\nUnknown type: ${type}" ${WARNING}
						boot_mesg "" ${NORMAL}
						continue
						;;
				esac

				# Set up the permissions, too.
				chown ${usr}:${grp} "${name}"
				chmod ${perm} "${name}"
			fi
		done
	exec 0>&9 9>&-
}

case "${1}" in
	start)
		boot_mesg -n "Cleaning file systems:" ${INFO}

		boot_mesg -n " /tmp" ${NORMAL}
		cd /tmp &&
		find . -xdev -mindepth 1 ! -name lost+found \
			-delete || failed=1

		> /var/run/utmp

		if grep -q '^utmp:' /etc/group ; then
			chmod 664 /var/run/utmp
			chgrp utmp /var/run/utmp
		fi

		(exit ${failed})
		evaluate_retval

		if egrep -qv '^(#|$)' /etc/sysconfig/createfiles 2>/dev/null; then
			boot_mesg "Creating files and directories..."
			create_files
			evaluate_retval
		fi
		;;
	*)
		echo "Usage: ${0} {start}"
		exit 1
		;;
esac

# End $rc_base/init.d/cleanfs