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guestfs-tools-release-notes-1.50 - Man Page

guestfs tools release Notes

Release Notes for Guestfs Tools 1.50

These are the release notes for guestfs tools stable release 1.50. This describes the major changes since 1.48.

Guestfs tools 1.50.0 was released on 7 February 2023.




A buffer overflow was found in the --key option of several guestfs tools.  For more information on this low severity bug see the bug report above (Laszlo Ersek).

New virt-drivers tool

This new tool can examine a disk image to determine:

  • Whether it uses BIOS or UEFI for booting
  • What bootloader it uses (Linux only)
  • What kernels may be chosen at boot time (Linux only)
  • What device drivers (kernel modules) are installed

This is useful for determining how (or if) a guest can boot on a virtualization hypervisor.


--selinux-relabel is now the default for SELinux guests.  You no longer need to specify this flag.  In the rare case where you don't want to relabel a guest after customizing it, you can use --no-selinux-relabel.  Note this is not needed for non-SELinux guests, it will do the right thing automatically (Laszlo Ersek).

New --inject-qemu-ga and --inject-virtio-win operations which respectively inject QEMU Guest Agent and virtio-win drivers into Windows guests.

Rocky Linux guests are now supported (thanks Harry Benson).


Virt-inspector now outputs the new <build_id> element containing the guest build ID, if using libguestfs ≥ 1.50.


New lvm-system-devices operation for removing LVM2's system.devices file.  This avoids certain problems when cloning a VM (Laszlo Ersek).

Virt-sysprep supports guests using LUKS logical volumes on top of LVM (Laszlo Ersek).

Common changes

All the tools supporting the --key option can now use Clevis/Tang to decrypt full disk encryption using this network-based scheme (Laszlo Ersek).

Build changes

Note that libguestfs now requires minimum OCaml 4.04.  It will not compile on RHEL 6.

Note that libosinfo is a new required dependency.

OCaml 4.14 is now supported.

./configure --disable-ocaml and ./configure --disable-perl now disable the OCaml- and Perl-based tools respectively (thanks Simon Walter).

Experimental support for compiling on macOS.

When running make check-valgrind, Valgrind logs are no longer written to separate files under tmp/.  Instead the output is written to the normal test-name.log file.

Bugs fixed


RFE: Support Rocky Linux in virt-customize


virt-sysprep: make an effort to support LUKS on LV


Removal of "--selinux-relabel" option breaks existing scripts


Having to use "--selinux-relabel" is not intuitive given Red Hat products default to selinux enabled.


[RFE] Request to add lvm system.devices cleanup operation to virt-sysprep


[RHEL 9.0][Nutanix] lvm partition "home" will lost with SCSI disk either in the new cloned VM or restored from a snapshot


Install the qemu-guest-agent package during the conversion process


[RFE] Add support for LUKS encrypted disks with Clevis & Tang


RFE: customize --selinux-relabel should be the default, with --no-selinux-relabel used to opt out

See Also



Laszlo Ersek

Richard W.M. Jones


This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.


To get a list of bugs against libguestfs, use this link: https://bugzilla.redhat.com/buglist.cgi?component=libguestfs&product=Virtualization+Tools

To report a new bug against libguestfs, use this link: https://bugzilla.redhat.com/enter_bug.cgi?component=libguestfs&product=Virtualization+Tools

When reporting a bug, please supply:


2024-04-25 guestfs-tools-1.53.1 Virtualization Support