Udev

udevadm control --reload-rules

• Récupérer les ID Vendeur et Modèle de votre device USB :

  lsub
  Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 011 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 010 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 006 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 009 Device 005: ID 08e6:3438 Gemplus GemPC Key SmartCard Reader
  Bus 009 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 008 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  Bus 005 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 004 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

• Créer le fichier XML de déclaration du device dans /etc/libvirt/[VM]-[device].xml :

  <hostdev mode='subsystem' type='usb' managed='yes'>
    <source>
      <vendor id='0x08e6'/>
      <product id='0x3438'/>
    </source>
    <alias name='gemplus-key-smartcard'/>
  </hostdev>

• A l'aide du script suivant, identifier le device USB correspondant :

  VENDOR=08e6
  MODEL=3438
  for X in /sys/bus/usb/devices/*; do
      if [ "$VENDOR" == "$(cat "$X/idVendor" 2>/dev/null)" -a "$MODEL" == "$(cat "$X/idProduct" 2>/dev/null)" ]
      then
          echo "$X"
      fi
  done

• Afficher toutes les informations du device vue par UDEV :

  udevadm info -q all -a --path=/sys/bus/usb/devices/9-1
    looking at device '/devices/pci0000:00/0000:00:13.0/usb9/9-1':
      KERNEL=="9-1"
      SUBSYSTEM=="usb"
      DRIVER=="usb"
  [...]
      ATTR{idVendor}=="08e6"
  [...]
      ATTR{idProduct}=="3438"
  [...]

• Construire la règle équivalente UDEV correspondante dans le fichier /etc/udev/rules.d/90-libvirt-usb.rules :

  # [VM] - [Device]
  ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="08e6", ATTR{idProduct}=="3438", RUN+="/usr/bin/virsh attach-device [VM] /etc/libvirt/[VM]-[Device].xml"
  ACTION=="remove", SUBSYSTEM=="usb", ENV{ID_VENDOR_ID}=="08e6", ENV{ID_MODEL_ID}=="3438", RUN+="/usr/bin/virsh detach-device [VM] /etc/libvirt/[VM]-[Device].xml"

• Recharger les règles UDEV :

  udevadm control --reload-rules

• Tester l'ajout et la suppression du device :

  # udevadm test --action='add' /sys/bus/usb/devices/9-1
  run_command: calling: test
  adm_test: version 175
  This program is for debugging only, it does not run any program,
  specified by a RUN key. It may show incorrect results, because
  some values may be different, or not available at a simulation run.
   
  parse_file: reading '/lib/udev/rules.d/42-qemu-usb.rules' as rules file
  [...]
  parse_file: reading '/etc/udev/rules.d/90-libvirt-usb.rules' as rules file
  [...]
  ACTION=add
  [...]
  DRIVER=usb
  ID_BUS=usb
  [...]
  ID_MODEL_ID=3438
  [...]
  ID_VENDOR=Gemplus
  ID_VENDOR_ENC=Gemplus
  ID_VENDOR_ID=08e6
  [...]
  PRODUCT=8e6/3438/100
  SUBSYSTEM=usb
  [...]
  run: '/usr/bin/virsh attach-device [VM] /etc/libvirt/[VM]-[Device].xml'
  # udevadm test --action='remove' /sys/bus/usb/devices/9-1
  [...]
  run: '/usr/bin/virsh detach-device [VM] /etc/libvirt/[VM]-[Device].xml'

Si vous avez bien la ligne run: dans les deux cas à la fin, c'est que c'est bon.