D.5. /etc/rc.d/init.d/udev

#### Linux From Scratch - Version 11.1

### Appendix D. Boot and sysconfig scripts version-20210608

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# D.5. /etc/rc.d/init.d/udev

    #!/bin/sh
    ########################################################################
    # Begin udev
    #
    # Description : Udev cold-plugging script
    #
    # Authors     : Zack Winkles, Alexander E. Patrakov
    #               DJ Lucas - dj@linuxfromscratch.org
    # Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
    #
    # Version     : LFS 7.0
    #
    ########################################################################

    ### BEGIN INIT INFO
    # Provides:            udev $time
    # Required-Start:      localnet
    # Should-Start:        modules
    # Required-Stop:
    # Should-Stop:
    # Default-Start:       S
    # Default-Stop:
    # Short-Description:   Populates /dev with device nodes.
    # Description:         Mounts a tempfs on /dev and starts the udevd daemon.
    #                      Device nodes are created as defined by udev.
    # X-LFS-Provided-By:   LFS
    ### END INIT INFO

    . /lib/lsb/init-functions

    case "${1}" in
       start)
          log_info_msg "Populating /dev with device nodes... "
          if ! grep -q '[[:space:]]sysfs' /proc/mounts; then
             log_failure_msg2
             msg="FAILURE:\n\nUnable to create "
             msg="${msg}devices without a SysFS filesystem\n\n"
             msg="${msg}After you press Enter, this system "
             msg="${msg}will be halted and powered off.\n\n"
             log_info_msg "$msg"
             log_info_msg "Press Enter to continue..."
             wait_for_user
             /etc/rc.d/init.d/halt stop
          fi

          # Start the udev daemon to continually watch for, and act on,
          # uevents
          /sbin/udevd --daemon

          # Now traverse /sys in order to "coldplug" devices that have
          # already been discovered
          /sbin/udevadm trigger --action=add    --type=subsystems
          /sbin/udevadm trigger --action=add    --type=devices
          /sbin/udevadm trigger --action=change --type=devices

          # Now wait for udevd to process the uevents we triggered
          if ! is_true "$OMIT_UDEV_SETTLE"; then
             /sbin/udevadm settle
          fi

          # If any LVM based partitions are on the system, ensure they
          # are activated so they can be used.
          if [ -x /sbin/vgchange ]; then /sbin/vgchange -a y >/dev/null; fi

          log_success_msg2
          ;;

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

    exit 0

    # End udev

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