Many thanks for your prompt and extensive reply, Richard! Thanks much,
Maxim. On Oct 2, 2017 12:22 PM, "Richard W.M. Jones" <[email protected]> wrote: > 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 >
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