[Users] Physical CDROM access

[Bob Doolittle]

On 12/17/2013 09:39 AM, Dan Kenigsberg wrote:
> The answer is in the log: "No medium found".
> Could you retry with a cd inside?
>
> Thread-311::DEBUG::2013-12-16 10:09:36,221::BindingXMLRPC::974::vds::(wrapper) client [172.16.0.58]::call vmChangeCD with ('99f89b62-d8e2-4ffd-b2e1-e471beff63b6', '/dev/cdrom') {}
> Thread-311::INFO::2013-12-16  10:09:36,222::clientIF::350::vds::(prepareVolumePath) prepared volume path: /dev/cdrom
> Thread-311::DEBUG::2013-12-16 10:09:36,307::libvirtconnection::108::libvirtconnection::(wrapper) Unknown libvirterror: ecode: 38 edom: 18 level: 2 message: cannot open file '/dev/cdrom': No medium found
> Thread-311::DEBUG::2013-12-16 10:09:36,307::vm::4150::vm.Vm::(_changeBlockDev) vmId=`99f89b62-d8e2-4ffd-b2e1-e471beff63b6`::updateDeviceFlags failed
> Traceback (most recent call last):
>    File "/usr/share/vdsm/vm.py", line 4148, in _changeBlockDev
>      diskelem.toxml(), libvirt.VIR_DOMAIN_DEVICE_MODIFY_FORCE)
>    File "/usr/share/vdsm/vm.py", line 835, in f
>      ret = attr(*args, **kwargs)
>    File "/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line 76, in wrapper
>      ret = f(*args, **kwargs)
>    File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1755, in updateDeviceFlags
>      if ret == -1: raise libvirtError ('virDomainUpdateDeviceFlags() failed', dom=self)
> libvirtError: cannot open file '/dev/cdrom': No medium found
> Thread-311::DEBUG::2013-12-16 10:09:36,325::BindingXMLRPC::981::vds::(wrapper) return vmChangeCD with {'status': {'message': 'Failed to change disk image', 'code': 41}}

Thanks - I missed this in the log, which is quite verbose. Now I know 
better what to look for.

I inserted some media, and tried again. I got the same output error. I 
then tried unmounting the media from the host itself, and retried the 
command, but the same result.

In the log (full log attached) I see:

Thread-3469::DEBUG::2013-12-17 11:16:07,402::BindingXMLRPC::974::vds::(wrapper) cl
ient [172.16.0.58]::call vmChangeCD with ('99f89b62-d8e2-4ffd-b2e1-e471beff63b6',
'/dev/sr0') {}
Thread-3469::INFO::2013-12-17 11:16:07,402::clientIF::350::vds::(prepareVolumePath
) prepared volume path: /dev/sr0
Thread-3469::DEBUG::2013-12-17 11:16:07,456::libvirtconnection::108::libvirtconnec
tion::(wrapper) Unknown libvirterror: ecode: 1 edom: 10 level: 2 message: internal
  error unable to execute QEMU command 'change': Could not open '/dev/sr0': Permiss
ion denied
Thread-3469::DEBUG::2013-12-17 11:16:07,456::vm::4150::vm.Vm::(_changeBlockDev) vm
Id=`99f89b62-d8e2-4ffd-b2e1-e471beff63b6`::updateDeviceFlags failed
Traceback (most recent call last):
   File "/usr/share/vdsm/vm.py", line 4148, in _changeBlockDev
     diskelem.toxml(), libvirt.VIR_DOMAIN_DEVICE_MODIFY_FORCE)
   File "/usr/share/vdsm/vm.py", line 835, in f
     ret = attr(*args, **kwargs)
   File "/usr/lib64/python2.6/site-packages/vdsm/libvirtconnection.py", line 76, in
  wrapper
     ret = f(*args, **kwargs)
   File "/usr/lib64/python2.6/site-packages/libvirt.py", line 1755, in updateDevice
Flags
     if ret == -1: raise libvirtError ('virDomainUpdateDeviceFlags() failed', dom=s
elf)
libvirtError: internal error unable to execute QEMU command 'change': Could not op
en '/dev/sr0': Permission denied
Thread-3469::DEBUG::2013-12-17 11:16:07,457::BindingXMLRPC::981::vds::(wrapper) re
turn vmChangeCD with {'status': {'message': 'Failed to change disk image', 'code':
  41}}


I tried with both /dev/cdrom and /dev/sr0 with the same result.

-Bob

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