Hi there,
I am using libvirt+qemu/kvm.
For a guest VM that is running, I could change its cdrom media by running the
following virsh command:
virsh attach-disk <vm-id> <path-to-iso-file> hdc --driver file --type cdrom
--mode readonly
This will change the media in the cdrom for the guest VM.
Once I am done, I can use virt-manager to disconnect the iso file to the cdrom.
The resulting xml file looks like (only showing the relevant part)
<disk type='file' device='cdrom'>
<target dev='hdc' bus='ide'/>
<readonly/>
</disk>
However, I am having trouble to do the same task (eject cd media) using virsh
command. I am successful in running the "virsh attach-device 1 emptyCD.xml"
command where the emptyCD.xml is an xml without the source file path, just like
the one above. However, I want to do it by a single command without the need to
create xml files. It should be something like
> virsh attach-disk 1 "" hdc --driver file --type cdrom --mode readonly
However, virsh does not like the empty string "".
I also looked at the virt-manager source code, in this case, the python script
is
912 if curpath:
913 # Disconnect cdrom
914 self.change_cdrom_media(dev_id_info, None, _type=None)
Basically a None parameter is pass to the API. All I need to find out is how to
do the same thing in the "virsh attach-disk" command.
Do you have any suggestions/comments?
Thanks a lot.
Shi
--
Shi Jin, PhD
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