Re: [Libguestfs] relaunching libguestfs with the same overlay

On Mon, Oct 02, 2017 at 11:50:42AM +0300, Maxim Kozover wrote: > Hi Richard! > Could you tell me, please, if there is a way to relaunch libguestfs with > the same overlay from the last run? The documentation tells the overlay is > removed when the handle to libguestfs is closed. Right, the overlay is created by libguestfs itself and thrown away when the handle is closed: https://github.com/libguestfs/libguestfs/blob/master/lib/drives.c#L68 https://github.com/libguestfs/libguestfs/blob/master/lib/ launch-direct.c#L78 However you can simply create your own overlay and use that. Run something like: qemu-img create -b orig_disk -f qcow2 my_overlay and change the guestfs_add_drive_opts call to use ‘my_overlay’ and don't use the readonly flag. > I'm talking about read-only mode so the real disks are not touched. The above won't touch the original disk, as long as you do _not_ run any commands such as ‘qemu-img commit’. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~ rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-p2v converts physical machines to virtual machines. Boot with a live CD or over the network (PXE) and turn machines into KVM guests. http://libguestfs.org/virt-v2v