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

#!/bin/sh
########################################################################
# Begin udev_retry
#
# Description : Udev cold-plugging script (retry)
#
# Authors     : Alexander E. Patrakov
#               DJ Lucas - dj@linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
#
# Version     : LFS 7.0
#
########################################################################

### BEGIN INIT INFO
# Provides:            udev_retry
# Required-Start:      udev
# Should-Start:        $local_fs
# Required-Stop:
# Should-Stop:
# Default-Start:       S
# Default-Stop:
# Short-Description:   Replays failed uevents and creates additonal devices.
# Description:         Replays any failed uevents that were skipped due to
#                      slow hardware initialization, and creates those needed
#                      device nodes
# X-LFS-Provided-By:   LFS
### END INIT INFO

. /lib/lsb/init-functions

case "${1}" in
   start)
      log_info_msg "Retrying failed uevents, if any..."

      rundir=$(/sbin/udevadm info --run)
      # From Debian: "copy the rules generated before / was mounted
      # read-write":
    
      for file in ${rundir}/tmp-rules--*; do
         dest=${file##*tmp-rules--}
         [ "$dest" = '*' ] && break
         cat $file >> /etc/udev/rules.d/$dest
         rm -f $file
      done

      # Re-trigger the failed uevents in hope they will succeed now
      /sbin/udevadm trigger --type=failed --action=add

      # Now wait for udevd to process the uevents we triggered
      /sbin/udevadm settle
      evaluate_retval
      ;;

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

exit 0

# End udev_retry