Your company here, and a link to your site. Click to find out more.

guestfs-release-notes-1.48 - Man Page

libguestfs Release Notes

Release Notes for Libguestfs 1.48

These are the release notes for libguestfs stable release 1.48. This describes the major changes since 1.46.

Libguestfs 1.48.0 was released on 14 March 2022.

Some features removed

The following little used, experimental or unsafe features have been removed:

"Libguestfs live" was an experimental feature that allowed you (in theory) to connect to an existing instance of the libguestfs daemon in a running guest.  If you want to do this we recommend installing qemu-guest-agent in the guest instead and using the APIs provided by it.  The related unix: backend has been removed.  The guestfish(1) and guestmount(1) --live option now prints an error.

The User-mode Linux (uml) backend has been removed.  It was an alternate hypervisor that could be used instead of qemu.  It had many limitations including lack of network support, and lack of qemu native features like qcow2 or network-backed disks.  In addition it was slower than KVM and particular features like bulk upload/download were painfully slow.  Also the UML feature of Linux that it was based on often does not work.

The 9pfs APIs guestfs_list_9p and guestfs_mount_9p have been deprecated and now return errors.  This was related to an experimental feature for passing through host filesystems to the appliance.  You had to hand-hack the qemu command line for this to work and it did not fit the libguestfs model very well.

guestfs_add_drive no longer supports hotplugging (adding a drive after launch), and guestfs_remove_drive has been deprecated and now returns an error.  Hotplugging was an unsuccessful feature which was complicated to implement and maintain, and was slow and insecure.  It also only worked with the non-default libvirt backend, and was never implemented in the default "direct" backend.

Language bindings

Fix allocation and deallocation of string lists in golang bindings (Laszlo Ersek).

Multiple fixes to the OCaml bindings: Fix warnings, move minimum version to OCaml 4.04, replace various deprecated OCaml features with modern OCaml features.

Running make distclean in the rust directory now completely cleans the cargo temporary files.


Fix inspection of modern Pardus GNU/Linux (Laszlo Ersek).

Add support for Kylin (Laszlo Ersek).

Add support for Rocky Linux (Neil Hanlon).

Inspection of guests which use LUKS encryption on top of LVM logical volumes should now work (Laszlo Ersek).


New APIs

No new APIs were added in libguestfs 1.48.

Other API changes

guestfs_list_9p and guestfs_mount_9p are deprecated and now return errors.

guestfs_remove_drive has been deprecated and now returns an error.

In guestfs_xfs_admin the lazycounter parameter is deprecated because it is no longer supported in recent versions of XFS.

Partition APIs now cope with the broken MBR partition tables created by dosfstools ≥ 4.2 (Laszlo Ersek).

In guestfs_md_create the chunk parameter should not be used with RAID 1.  Previously it was allowed but ignored, but now it will give an error (Laszlo Ersek).

Build changes

Multiple compiler warnings fixed and/or analyzed and suppressed (Laszlo Ersek).

Fix detection of optional Yara library using pkg-config instead of checking for library/header file (Laszlo Ersek).

Update valgrind suppressions for glibc 2.35, OCaml 4.13 and libvirt 7.7.  make check-valgrind works again.

If using libvirt ≥ 3.8.0, we now use <interface> to create the appliance network interface instead of adding qemu command line parameters (Laszlo Ersek).

The guestfs-release-notes(1) page was a broken link, but it has now been restored as a new page that links to the release notes from each stable release.


The libc API strerror_r(3) is difficult to use correctly because of differing signatures in glibc and other libc.  A wrapper guestfs_int_strerror has been created to hide the differences.

Bugs fixed


[RFE] libguestfs: Add Rocky Linux support


Fix usage of strerror_r which caused corrupted error messages


xfs-admin: Cannot disable lazy-counters on V5 fs


RFE: virt-inspector fails to detect the distro and applications on Kylin-Desktop-V10 image


RFE: virt-inspector fails to detect the distro on Pardus-19.5 image


work around mkfs.vfat writes corrupted filesystem/partition table when used on whole block device


RFE: Virt-v2v can't convert the guest which has encrypted partition

See Also

guestfs-examples(1), guestfs-faq(1), guestfs-performance(1), guestfs-recipes(1), guestfs-testing(1), guestfs(3), guestfish(1), http://libguestfs.org/


Laszlo Ersek

Neil Hanlon

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:

Referenced By


2024-05-10 libguestfs-1.53.2 Virtualization Support