Richard W.M. Jones ce4bfa5d08 lib: Add get_default_hv to backend operations
Add a generic way for backends to report the default hypervisor
(ie. QEMU) back to the main code.

The direct implemention reflects the current way that the hypervisor
is chosen at configure time (see m4/guestfs-qemu.m4).

For the libvirt backend, we are already getting this from libvirt
domcapabilities, so we can just return that field.

Note this may return NULL (roughly "no data"), particularly in the
libvirt case because that requires us to have launched the appliance
already.
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Libguestfs is tools and a library for accessing and modifying guest
disk images.  For more information see the home page:

  http://libguestfs.org/

For discussion, development, patches, etc. please use the mailing
list:

  https://lists.libguestfs.org

To find out how to build libguestfs from source, read:

  docs/guestfs-building.pod
  http://libguestfs.org/guestfs-building.1.html
  man docs/guestfs-building.1

Copyright (C) 2009-2025 Red Hat Inc.

The library is distributed under the LGPLv2+.  The programs are
distributed under the GPLv2+.  Please see the files COPYING and
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