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

#!/bin/sh
########################################################################
# Begin cleanfs
#
# Description : Clean file system
#
# Authors     : Gerard Beekmans - gerard@linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
#
# Version     : LFS 7.0
#
########################################################################

### BEGIN INIT INFO
# Provides:            cleanfs
# Required-Start:      $local_fs
# Should-Start:
# Required-Stop:
# Should-Stop:
# Default-Start:       S
# Default-Stop:
# Short-Description:   Cleans temporary directories early in the boot process.
# Description:         Cleans temporary directories /var/run, /var/lock, and
#                      optionally) /tmp.  cleanfs also creates /var/run/utmp 
#                      and any files defined in /etc/sysconfig/createfiles.
# X-LFS-Provided-By:   LFS
### END INIT INFO

. /lib/boot/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}

      if [ "${SKIPTMPCLEAN}" = "" ]; then
		   boot_mesg -n " /tmp" ${NORMAL}
		   cd /tmp &&
		   find . -xdev -mindepth 1 ! -name lost+found -delete || failed=1
      fi

		> /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 cleanfs