I'm pleased to announce the new stable release of libguestfs. Libguestfs is a library for creating and manipulating disk images, virtual machines and similar. You can read more about it here: https://libguestfs.org/ The release notes for this version are attached below, or you can read them online here: https://libguestfs.org/guestfs-release-notes-1.58.1.html You can get source tarballs from: https://download.libguestfs.org/1.58-stable/ Rich. RELEASE NOTES FOR LIBGUESTFS 1.58 These are the release notes for libguestfs stable release 1.58. This describes the major changes since 1.56. Libguestfs 1.58.0 was released on 5th January 2026. Inspection Fix inspection of SLES 15 guests that have an encrypted Btrfs filesystem, by correctly parsing /etc/crypttab (Cole Robinson). Windows named drives (like "D:") which point to completely blank disks are now ignored instead of causing an error (thanks Ming Xie, Ameen Barakat). Existing code in virt-v2v which recognized Windows Antivirus (AV) software is now part of inspection. The new code recognizes a wider range of AV software. API "guestfs_selinux_relabel" was deprecated, replaced by new "guestfs_setfiles". This new API also uses the setfiles(8) -A option to reduce memory usage. New "guestfs_ntfs_chmod" API which changes the permissions of Windows paths (Cole Robinson). In the list of structures returned by "guestfs_inspect_get_applications2", a new "app2_class" field has been added. This classifies the application by its primary usage, but currently only "antivirus" can be returned here for Windows AV software. New "guestfs_inspect_get_windows_group_policy" API which reports whether Group Policy Objects were found in the Windows guest. "guestfs_btrfs_subvolume_show" would sometimes crash when parsing the snapshots of a Btrfs subvolume. Furthermore, in any API that returned a device name associated with a Btrfs volume, the device name might not be translated correctly resulting in the wrong device name being returned. (Both problems fixed by Arye Yurkovsky.) Fix a memory leak in "guestfs_filesystem_walk" (Susant Sahani). In "guestfs_disk_create", when creating raw block devices, check for errors in the close(2) system call, ensuring we don't miss any delayed I/O errors (Susant Sahani). In several LVM-related APIs, it was possible for an internal failure to happen for logical volumes which are incomplete (eg. missing a physical volume). This was fixed by skipping these LVs (Arye Yurkovsky). Language bindings Note that GObject / Javascript bindings will be removed in the next release of libguestfs. Ruby deprecation warnings were fixed (Cole Robinson). Documentation Fix links to ntfs-3g documentation (Cole Robinson). Build changes libvirt ≥ 11.10.0 with passt support is now required. qemu ≥ 7.2.0 is now required. Fix guestmount compilation on macOS (thanks Mohamed Akram). Basic github CI has been implemented. Pull requests now do the equivalent of "./configure --enable-werror && make && make check" on a few common platforms. Several obsolete tests were removed, and the test suite in general has been fixed and made more robust against missing dependencies and other common problems (Cole Robinson). In test output we no longer print absolute paths for the test names (Cole Robinson). "AM_GNU_GETTEXT" usage was completely removed and replaced with a simple test for LIBINTL (Cole Robinson). build-aux/config.rpath was removed since it was no longer actually used (Cole Robinson). Fix const-correctness issues caused by changes to the strchr(3) and strrchr(3) functions in C23. Internals If the "sit.ko" Linux kernel module is loaded, then a "sit0" (a kind of IPv6 tunnel) network device is created in the appliance. Ignore this as it would break appliance networking (thanks Srikanth Aithal, Stefano Brivio). In the direct backend we simplified probing of qemu features by assuming that qemu ≥ 7.2.0. In the libvirt backend: • Fix compatibility with SeaBIOS 1.17 (thanks Gerd Hoffmann). • We made some changes to how errors from the libvirt call "virDomainDestroyFlags" are handled when shutting down the appliance. If there is an error, the error message is now printed when debug is enabled (but it is still non-fatal). Also we sleep between retries instead of busy looping. • The libvirt backend now adds a virtio-rng device to the appliance unconditionally so that we always have good entropy (for cryptographic operations). • When running as root, remove explicit socket relabelling and allow libvirt to relabel the sockets instead (Cole Robinson). • Enable sVirt for the appliance, which was sometimes accidentally disabled (Cole Robinson). During inspection of Linux/Unix guests, the contents of guest /etc/fstab and some mdadm files are written to debug output. This can help with debugging inspection issues (thanks Ming Xie). When the appliance starts up, if debugging is enabled, then we log lsblk(8) and blkid(8) info to debugging output (thanks Ming Xie). In the generator StringList(Pathname) was implemented for OCaml functions. Add more debugging in Windows Registry inspection functions to make it easier to track what's going on. OCaml "{|...|}" string literals are now used in the code for things like literal Windows batch files that we inject into the guest, regular expressions, and POD documentation in the generator (thanks Nicolas Ojeda Bar). Internal calls to pcre2_match(3) which return an unexpected error now emit a debug message, although the error is still ignored. Multiple code cleanups throughout (Susant Sahani). Fix order of inclusion of Python header file because of changes in recent Python 3.14. Some test scripts which were written in Perl before have been rewritten in Python (Susant Sahani). Bugs fixed https://issues.redhat.com/browse/RHEL-104352 Change permission of guestfs folder created https://issues.redhat.com/browse/RHEL-106490 Adding the commands "lsblk", "cat /etc/fstab" and "blkid" to the v2v debug log https://issues.redhat.com/browse/RHEL-108803 Parted fails to read a blank disk "virt-v2v: error: libguestfs error: inspect_os: parted: /dev/sdb: parted exited with status 1: Error: /dev/sdb: unrecognised disk label: Invalid argument" [rhel-9.7] https://issues.redhat.com/browse/RHEL-111165 [Testonly]virt-v2v of RHEL 8.10 VM fails because setfiles invoked oom-killer https://issues.redhat.com/browse/RHEL-111505 Lots of memory used in 'setfiles' utility / 'restorecon_sb' function https://issues.redhat.com/browse/RHEL-113397 [DEV Task]: The available subscriptions of guest sometimes can't be shown unless use --sm-remove and --sm-unregister options to remove all subscriptions from the guest https://issues.redhat.com/browse/RHEL-113398 [DEV Task]: Virt-v2v can't use --sm-remove and --sm-unregister options to remove the subscriptions from guest if consumer profile has been deleted from the guest. https://issues.redhat.com/browse/RHEL-114292 Use setfiles -A option when relabelling https://issues.redhat.com/browse/RHEL-121076 [libguestfs] [aarch64] libguestfs-test-tool failed with LIBGUESTFS_BACKEND=direct https://issues.redhat.com/browse/RHEL-125846 virt-inspector detect if AV/GPOs are present in a VM https://issues.redhat.com/browse/RHEL-93584 virt-v2v can't convert sles15sp6 guest with encrypted brtfs fliesystem https://github.com/libguestfs/libguestfs/issues/180 Fails to build with macFUSE https://github.com/libguestfs/libguestfs/issues/234 make -j8 check failures with selinux enforcing SEE ALSO guestfs-examples(1), guestfs-faq(1), guestfs-performance(1), guestfs-recipes(1), guestfs-testing(1), guestfs(3), guestfish(1), http://libguestfs.org/ AUTHORS Arye Yurkovsky Cole Robinson Ettore Atalan Fco. Javier F. Serrador Pavel Borecki Richard W.M. Jones Susant Sahani Yuri Chornoivan -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com virt-builder quickly builds VMs from scratch http://libguestfs.org/virt-builder.1.html