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udevadm [2018/04/09 08:02] – created beandogudevadm [2018/04/09 08:07] (current) – beandog
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 ====== udevadm ====== ====== udevadm ======
 +
 +  * [[udev]]
  
 You can use udevadm to see the variables set by udev for a device. This is helpful if you want to get information about the device, based on whether it has a DVD or a CD in there, for example. You can use udevadm to see the variables set by udev for a device. This is helpful if you want to get information about the device, based on whether it has a DVD or a CD in there, for example.
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 <code> <code>
 udevadm info /dev/sr0 udevadm info /dev/sr0
 +</code>
 +
 +If you want to change any rules, such as in ''/lib/udev/rules.d'' or ''/etc/udev/rules.d'', you can reload them with udevadm as well:
 +
 +<code>
 +udevadm trigger
 +</code>
 +
 +That's what I use when doing my onevent trayclose calls.
 +
 +In ''/etc/udev/rules.d/70-persistent-cd.rules'' I generate a symlink to ''/dev/dvd'' and ''/dev/bluray'', as well as call ''onevent.trayclose'' when there is a DVD detected in the drive on an event change (tray closed from being open).
 +
 +<code>
 +# Sony Blu-ray
 +SUBSYSTEM=="block", ENV{ID_MODEL}=="ATAPI_iHOS104", ENV{ID_REVISION}=="WL0D", SYMLINK+="bluray", ENV{GENERATED}="1"
 +SUBSYSTEM=="block", ENV{ID_MODEL}=="ATAPI_iHOS104", ENV{ID_REVISION}=="WL0D", SYMLINK+="dvd", ENV{GENERATED}="1"
 +SUBSYSTEM=="block", ENV{ID_MODEL}=="ATAPI_iHOS104", ENV{ID_CDROM_MEDIA_DVD}=="1", ENV{ID_CDROM_MEDIA_STATE}=="complete", RUN+="/usr/local/bin/onevent.trayclose"
 +</code>
 +
 +For completion's sake, here's ''onevent.trayclose'':
 +
 +<code>
 +#!/bin/bash
 +mount -o ro -t udf $DEVNAME &> /dev/null
 +if [[ -z "$ID_FS_LABEL" ]]; then ID_FS_LABEL=$(busybox volname $DEVNAME); fi
 +echo "/usr/bin/sudo -u steve /home/steve/Videos/Rip-o-Matic/spincycle $DEVNAME $ID_FS_LABEL" | at now
 </code> </code>

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