[ale] Detetcting a DVD in the drive?

[Brian Pitts]

On 08/24/2009 06:28 PM, Robert L. Harris wrote:
> 
>    I am trying to write a script for a friend to automatically dump an 
> ISO to a
> DVD, but I am looking for a way to detect a DVD in the drive.  Anyone have
> a way to do this?   "mt -f /dev/cdrom status" fails, unsurprisingly....
> 
> Robert
> 

Something like the following, assuming there's only one optical drive in
the system.

brian at triangle:~$ DRIVE=$(hal-find-by-capability --capability
"storage.cdrom")
brian at triangle:~$ echo $DRIVE
/org/freedesktop/Hal/devices/storage_model_DVD__RW_TS_L632D
brian at triangle:~$ MEDIA=$(hal-get-property --udi $DRIVE --key
storage.removable.media_available)
brian at triangle:~$ echo $MEDIA
true
brian at triangle:~$ eject
brian at triangle:~$ MEDIA=$(hal-get-property --udi $DRIVE --key
storage.removable.media_available)
brian at triangle:~$ echo $MEDIA
false

I thought that

hal-find-by-property  --key "storage.removable.media_available" --string
"true"

would work, but apparently hal-find-by-property only works when the key
values are strings, and this key value is boolean? That's the best
explanation I could come up with.

-- 
All the best,
Brian Pitts