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

#!/bin/sh
########################################################################
# Begin cleanfs
#
# Description : Clean file system
#
# Authors     : Gerard Beekmans - gerard@linuxfromscratch.org
#               DJ Lucas - dj@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/lsb/init-functions

# Function to create files/directory on boot.
create_files() 
{
   # Input to file descriptor 9 and output to stdin (redirection)
   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
                     ;;
                  *) 
                     log_warning_msg "\nUnknown device type: ${dtype}" 
                     ;;
               esac
               ;;
            *)
               log_warning_msg "\nUnknown type: ${type}" 
               continue
               ;;
         esac

         # Set up the permissions, too.
         chown ${usr}:${grp} "${name}"
         chmod ${perm} "${name}"
      fi
   done

   # Close file descriptor 9 (end redirection)
   exec 0>&9 9>&-
   return 0
}

case "${1}" in
   start)
      log_info_msg "Cleaning file systems:" 

      if [ "${SKIPTMPCLEAN}" = "" ]; then
         log_info_msg2 " /tmp" 
         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
         log_info_msg "Creating files and directories... "
         create_files      # Always returns 0
         evaluate_retval
      fi

      exit $failed
      ;;
   *)
      echo "Usage: ${0} {start}"
      exit 1
      ;;
esac

# End cleanfs