Richard W.M. Jones
2021-Aug-16 08:50 UTC
[Libguestfs] [libguestfs/libguestfs] guestunmount should not return before the image can be used by other vm (#70)
On Wed, Aug 11, 2021 at 01:21:18AM -0700, braindevices wrote:> If I understood correct, the libguestfs actually start a qemu vm under the > hood. When I call guestunmount it unmounts the image then shutdown the vm. > However, if I do this programmably, commonly it will fail due to the vm is > still using the image: > > guestmount -d guest1 mnt > # do something with the image > guestunmount mnt > virsh start guest1 > > I have to add sleep between guestunmount and other command. However, > this time interval is not certain, it can be quite long at some > time. So I propose to add some option to let the guestunmount only > return after the qemu vm release the image. Is there any work around > right now for this?If the libvirt configuration uses cache=none, you could be hitting this: https://github.com/rwmjones/guestfs-tools/blob/9ba463545fa017910a5077434f87ae67e146c9e0/builder/builder.ml#L774 Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://people.redhat.com/~rjones/virt-top