qemu access to the native CD-ROM on f8?

[Sur]

* Robert P. J. Day wrote, On 01/21/2008 09:23 PM:
> On Mon, 21 Jan 2008, Andras Simon wrote:
> 
>> On 1/21/08, Robert P. J. Day <rpjday at crashcourse.ca> wrote:
>>>   i'm sure i'm screwing up something simple but i'm trying to use the
>>> basic qemu PC system emulator and the linux image
>>> "linux-0.2.img[.bz2]" here:
>>>
>>> http://fabrice.bellard.free.fr/qemu/download.html
>>>
>>> to access my native CD-ROM.
>>>
>>>   it's a piece of cake to invoke the emulator thusly:
>>>
>>>   $ qemu linux-0.2.img
>>>
>>> and i can even see a reference to the "QEMU CD-ROM" go blazing by
>>> during the boot process.  but after that ... nothing.
>>>
>>>   the online qemu docs here:
>>>
>>> http://fabrice.bellard.free.fr/qemu/qemu-doc.html#SEC20
>>>
>>> *seem* to suggest that i should simply have access automatically via
>>> the device file /dev/cdrom, but the qemu session has no such file.
>>>
>>>   and the situation on the host system:
>>>
>>> $ ls -l /dev/{cdrom,scd0,sr0}
>>> lrwxrwxrwx  1 root root     3 2008-01-18 08:56 /dev/cdrom -> sr0
>>> lrwxrwxrwx  1 root root     3 2008-01-18 08:56 /dev/scd0 -> sr0
>>> brw-rw-rw-+ 1 root disk 11, 0 2008-01-18 08:56 /dev/sr0
>>> $
>>>
>>>   so i certainly seem to have sufficient device files on the host, and
>>> the actual device file has world R/W access.  thoughts?
>> I think you should start qemu with
>>
>> qemu -cdrom /dev/cdrom linux-0.2.img
> 
> i've tried that, and every variation of that i could think of
> (/dev/sr0, /dev/scd0).  but, as i said earlier, i don't think the
> "-cdrom" option is for assigning devices, i think it's for associating
> *image files* with devices.  in any event, the above still doesn't
> show me an available CD device from within QEMU.

that should work, read Invocation section carefully:
http://fabrice.bellard.free.fr/qemu/qemu-doc.html#TOC10

when you use -cdrom, the device always becomes /dev/hdc on guest, so 
-hdc and -cdrom options are mutually exclusive.

If you're still having problems, it could be related to Selinux 
security, check /var/log/audit/audit.log for related bits.


> 
> i'm wondering if it's related to the *type* of optical device -- this
> is a dual-layer DVD burner.  would that somehow make it unrecognizable
> as a simple CD device?  has *anyone* done this and got it to see the
> CD device?
> 
> rday
> --
> 
> 
> 
> ========================================================================
> Robert P. J. Day
> Linux Consulting, Training and Annoying Kernel Pedantry
> Waterloo, Ontario, CANADA
> 
> Home page:                                         http://crashcourse.ca
> Fedora Cookbook:    http://crashcourse.ca/wiki/index.php/Fedora_Cookbook
> ========================================================================
>