Added a --replace option to virt-image which allows it to replace an existing machine if it is current running or defined
 

David Lutterkort wrote:

On Thu, 2008-06-26 at 12:47 -0400, Bryan M. Kearney @redhat.com wrote:

# HG changeset patch
# User "Bryan M. Kearney <bkearney@redhat.com>"
# Date 1214497967 14400
# Node ID efba908eb79ad0bf2805c27f784de92578207f1b
# Parent 63aca2dbb3154a65505b1ccef080a8887742cef5
Added a --replace option to virt-image which allows it to replace an existing machine if it is current running or defined


Couldn't the same be achieved with a small shell script wrapper around
the virt-image invocation, something like

virsh list | grep -q $NAME && virsh destroy $NAME
virt-image $IMAGE_XML

It seems that this patch addresses a very specific use case (repeatedly

starting a VM based on the same image.xml)

Other than that it might be redundant though, the patch looks fine.



For me, if I have a shutoff machine then 'virsh list' does not return
anything, but virt-manager shows me the shutoff machine. In addition,
virt-image will fail on an install because of the shutoff machine.


I believe your script would work if the machine was running, and if I
knew the name of the machine inside the image_xml.


So. this patch will destroy a running one, or replace a defined one with
the same name.


-- bk

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Added a --replace option to virt-image which allows it to replace an existing machine if it is current running or defined
 

Daniel P. Berrange wrote:

On Thu, Jun 26, 2008 at 12:47:27PM -0400, "Bryan M. Kearney <bkearney@redhat.com>"@redhat.com wrote:

+ if vm.ID() == -1:
+ logging.info("Removing old definition for image %s" %(self.name))
+ vm.undefine()
+ else:
+ logging.info("Destroying image %s" %(self.name))
+ vm.destroy()


You don't want this to be an either / or conditional. If the VM exists
you should *always* attempt to undefine it - a running VM may or may
not have a config file

So you want something closer to

if vm.ID() != -1:
vm.destroy()

try:
vm.undefine()
except:
pass

Daniel


I thought destroy did an undefine. I have made the change, will resend
the patch.


-- bk

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