I'm pleased to announce libguestfs 1.38, a library and a set of tools
for accessing and modifying virtual machine disk images.

This release represents about a year of work by many contributors.
I'd like to call out in particular substantial contributions from:
Cédric Bosdonnat, Pavel Butsykin, Matteo Cafasso, Tomáš Golembiovský,
Nikos Skalkotos, and Pino Toscano.

Virt-builder-repository is a new tool for creating virt-builder
repositories.  Virt-rescue has been rewritten, implementing
implementing job control, -m and -i options, escape keys.  Virt-v2v
has several new methods to pull VMs out of VMware faster.  The
inspection code was rewritten and placed inside the daemon making it
much faster and more robust.

Of course dozens of other features have been added, and many bugs
fixed.  See the release notes below for full details.

You can get libguestfs 1.38 from here:

   Main website: http://libguestfs.org/ [not updated yet]
         Source: http://libguestfs.org/download/1.38-stable/
         Fedora: https://koji.fedoraproject.org/koji/packageinfo?packageID=8391
 Debian/experimental: https://packages.debian.org/libguestfs0

Note for distro packagers: ocaml >= 4.01, ocaml-hivex are now
mandatory build dependencies.  If using glibc >= 2.27 which dropped
support for SunRPC and crypt(3), you will need rpcgen, libtirpc and



Release notes for libguestfs 1.38

These are also available online at:

   New features
       New tools

       Virt-builder-repository is a new tool allowing end users to create and
       update virt-builder repositories (Cédric Bosdonnat).

       Virt-rescue (while not a new tool) has been substantially rewritten,
       implementing job control, -m and -i options, escape keys, etc.

       New features in existing tools

       Virt-builder planner has been improved so that faster and more
       efficient build plans are chosen for complex cases, especially when
       either the tmpdir or output is on networked storage.

       New virt-builder Fedora templates (starting with Fedora 26) will have
       plain partition layout and use GPT for partitions.

       Virt-customize "firstboot" scripts in guests using systemd are now
       installed under the "multi-user.target" instead of "default.target" so
       they will only run when the system is booted normally.

       Virt-customize now sets a random /etc/machine-id for Linux guests, if
       one is not already set.

       Virt-df now works correctly on filesystems with block sizes smaller
       than 1K (Nikolay Ivanets).

       Virt-dib has further compatibility enhancements with diskimage-builder
       (Pino Toscano).

       Virt-sysprep removes "DHCP_HOSTNAME" from ifcfg-* files.

       Virt-sysprep now works on Oracle Linux (Jamie Iles).

       Virt-resize now correctly copies GPT partition attributes from the
       source to the destination (Cédric Bosdonnat).

       Bash tab completion implemented or enhanced for: virt-win-reg,

       virt-v2v and virt-p2v

       Virt-v2v can now read VMware VMX files directly, either from local
       disk, NFS storage, or over SSH from an ESXi hypervisor.

       Virt-v2v can now use VDDK as an input source.

       Both virt-v2v and virt-p2v are now able to pass through the source CPU
       vendor, model and topology.  However unfortunately not all source and
       target hypervisors are able to provide or consume this data at present
       (Tomáš Golembiovský).

       Virt-v2v now supports encrypted guests (Pino Toscano).

       Virt-v2v can now handle VMware snapshots.  Note that the snapshots are
       collapsed — it does not convert the chain of snapshots into a chain of

       Virt-v2v now installs Windows 10 / Windows Server 2016 virtio block
       drivers correctly (Pavel Butsykin, Kun Wei).

       Virt-v2v now installs virtio-rng, balloon and pvpanic drivers, and
       correctly sets this in the target hypervisor metadata for hypervisors
       which support that (Tomáš Golembiovský).

       Virt-v2v now installs both legacy and modern virtio keys in the Windows
       registry (Ladi Prosek).

       Virt-p2v can now preserve (in some cases) the offset of the Real Time
       Clock from UTC.

       Virt-p2v now combines several scp commands to the conversion server
       into a single command, improving conversion times.

       Virt-v2v now detects the special Linux Xen PV-only kernels correctly
       (Laszlo Ersek).

       Virt-v2v -o glance now generates the right properties for UEFI guests
       (Pino Toscano).

       Virt-v2v -o null now avoids spooling the guest to a temporary file,
       instead it writes to the qemu "null block device".  This makes it
       faster and use almost no disk space.

       Virt-v2v -o rhv now supports Windows 2016 Server guest type.

       Virt-v2v -i libvirtxml can now open network disks over http or https.

       Virt-v2v will now give a warning about host passthrough devices (Pino

       The virt-v2v --machine-readable output has been enhanced so it includes
       "vcenter-https", "xen-ssh" and "in-place" facts (Pino Toscano).

       Language bindings

       Fix multiple memory leaks and other data corruption problems in the
       Java bindings (Pino Toscano).

       Perl %guestfs_introspection has been dropped.


       Inspection support was rewritten in OCaml and included inside the
       daemon.  This makes inspection considerably faster, more robust and
       more easily extensible in future.

       Better icon support for ALT Linux guests (Pino Toscano).

       Better support for NeoKylin (Qingzheng Zhang).

       Can handle OSes like Void Linux which do not include "VERSION_ID" in
       /etc/os-release (Pino Toscano).

       Add support for Microsoft MS-DOS (Daniel Berrangé).

       Architectures and platforms

       Multiple fixes for S/390 architecture.  Libguestfs and all the tools
       should now compile and run on this architecture.


       The libguestfs API is now thread-safe (although not parallel).  You can
       call APIs on the same handle from multiple threads without needing to
       take a lock.

       There were multiple vulnerabilities in the icoutils "wrestool" program
       which is run by libguestfs to create icons for Windows guests.  Using
       the latest "wrestool" is recommended.

       New APIs

           This replaces the deprecated "hivex_value_utf8" API, but does the
           same thing.

           Read and write GPT partition attribute flags (Cédric Bosdonnat).

           Enlarge or shrink an existing partition (Nikos Skalkotos).

           Support for the Yara malware scanning engine (Matteo Cafasso).

       Other API changes

       APIs implemented in the daemon can now be written in either C or OCaml.
       Several APIs were rewritten in OCaml, although we are not planning to
       rewrite all of them.

       You will now get a clear error message if you try to add too many disks
       to the appliance, instead of getting a peculiar failure from qemu.

       Certain APIs accidentally allowed you to use "/dev/urandom" as an input
       "device", eg. "g.copy_device_to_device("/dev/urandom", "/dev/sda")".
       The code has been modified to forbid this usage.

       All APIs for inspecting installer CDs have been deprecated.  Use
       libosinfo for this task.

   Build changes
       A working OCaml compiler ≥ 4.01 is now required for building
       libguestfs.  The "./configure --disable-ocaml" option remains but is
       only used to disable the OCaml language bindings.

       Add "RELEASES" file which lists release dates for each version of
       libguestfs.  You must update this file when making a new release.

       Documentation generated by "gtk-doc" has been removed.  "./configure
       --enable-gtk-doc" now does nothing.

       Libtirpc is now used for XDR functions and rpcgen.  Note that glibc has
       deprecated and in most Linux distros dropped these, so for most people
       this will be an extra dependency (Martin Kletzander).

       Libxcrypt is now used for crypt(3).  This is required if using glibc ≥

       "ocaml-hivex" is now required.

       Libvirt ≥ 1.2.20 is now required.

       There is now a "make check-root" target for tests which need to be run
       as root (analogous to "make check-slow").

       "./configure"-time check for "__attribute__((cleanup))" now works in
       the cross-compilation case (Yann E. Morin).

       The "AUTHORS" and "p2v/about-authors.c" files are now generated from a
       single place.

       Either GnuPG v1 or v2 can be used.

       "./configure --with-guestfs-path" may be used to set the default
       "LIBGUESTFS_PATH".  In addition the way that the path is searched has
       changed slightly so that all types of appliances are searched in each
       path element separately (Pavel Butsykin).

       "GUESTFSD_EXT_CMD" which was used to mark external commands in the
       daemon has been removed.  It was originally used by SUSE builds, but
       they have not been using it for a while.

       The output from "./configure" is now visually grouped under headings
       related to what it is doing, making it much easier to scan (Pino

       OCaml dependencies are now generated from a single script instead of
       multiple not-quite-the-same Makefile fragments.

       "./configure --with-distro=ID" can be used to override automatic Linux
       distro detection at build time (Pino Toscano).

       qemu ≥ 2.10 is supported (but not required).  This adds mandatory
       locking to disks and libguestfs turns this off in certain circumstances
       when it is known to be safe (Lars Seipel, Peter Krempa, Daniel
       Berrangé, Pino Toscano, Fam Zheng, Yongkui Guo, Václav Kadlčík).

       Most common code has been moved to the common/ subdirectory, with OCaml
       common code being in common/ml* directories (eg.  common/visit and
       common/mlvisit contain the visitor library in C and OCaml
       respectively).  The mllib directory has been deleted and replaced by

       There is now a lightweight OCaml binding for PCRE, see common/mlpcre.
       Use of OCaml "Str" library has been mostly replaced with PCRE.

       Add more calls to "udev_settle" to improve stability of partition code
       (Dawid Zamirski).

       Run "udev_settle" with --exit-if-exists option, which improves the
       speed of this command (Pavel Butsykin).

       Detect new locations of major(3), minor(3), makedev(3).

       Actions can now be deprecated with no suggested replacement, for APIs
       such as "guestfs_wait_ready" that should simply be removed from client

       Use gnulib "set_nonblocking_flag" wrapper instead of calling fcntl(2)
       with "O_NONBLOCK" (Eric Blake).  Similarly "set_cloexec_flag".

       Fix memory leak in XFS version of "guestfs_vfs_minimum_size" (Pino

       Valgrind checks now run on the virt-p2v binary.

       Unicode single quotes ("‘’") and now used in place of '' or `'
       throughout the code and documentation.  Similarly for "’s" instead of

       The "is_zero" function has been reimplemented for greater speed (Eric

       In the direct backend, virtio-blk support has been removed.  Virtio-
       scsi is now the only supported way to add disks.

       Generator string parameter and return types have been rationalised so
       there are only two types ("String", "StringList") with many subtypes
       eg. "FileIn" becomes "String (FileIn, ...)".

       The appliance disk image can now be in formats other than raw (Pavel

       Multiple improvements to how we automatically build Debian templates
       for virt-builder (Pino Toscano).  Enable serial console for these
       templates (Florian Klink).

       In the daemon, instead of making a private copy of lvm.conf and
       modifying it (eg for filters), start with an empty file since LVM
       understands that to mean "all defaults" (Alasdair Kergon, Zdenek

       The "direct" backend can now run QMP queries against the QEMU binary,
       enhancing the kinds of information we can detect.  In addition the code
       to query QEMU has been made more robust for handling multiple parallel
       queries of different versions of QEMU.

       OCaml Augeas bindings are bundled under common/mlaugeas.  The long term
       plan is to remove this and use system ocaml-augeas when it is more
       widely available in distros (Pino Toscano).

       All OCaml modules ("*.ml" files) are now required to have an interface
       file ("*.mli").  If they don't export anything then the interface will
       be empty except for comments.

       Certain OCaml features in OCaml ≥ 4.01 are used throughout the code,
       including replacing ‘{ field = field }’ with ‘{ field }’.

       Virt-builder "make-template" utility now uses the "virt-install
       --transient" option so that we should never need to clean up left over
       domains after a crash.  It also saves kickstarts and virt-install
       commands, which are committed to git for future reference.

       /dev/shm is now created in the appliance (Nicolas Hicher).

       In verbose mode on Fedora guests, virt-customize will now use "dnf
       --verbose" enabling better debugging output.

       Virt-v2v input and output classes now contain a "#precheck" method
       which is used to perform environmental checks before conversion starts.

       Virt-p2v enables miniexpect debugging.  It is written to stderr (of

       Virt-v2v free space checks are more liberal especially for smaller
       guests (Pino Toscano).

   Bugs fixed
           Example URI of "Convert from ESXi hypervisor over SSH to local
           libvirt" is incorrect in v2v man page

           virt-customize segfaults after upgrading to 1.37.35-3

           Libguestfs Perl bindings can leak a small amount of memory on error

           libguestfs Lua bindings use strerror(), which isn’t thread safe

           man page makes no mention of using '--' when trying to change exit
           on error behavior

           virt-df displays zeros for filesystems with block size =512

           v2v should improve the result when convert a rhel7.4 guest with no
           available kernels found in the bootloader

           virt-v2v fails with "unsupported configuration: shared access for
           disk 'sdb' requires use of supported storage format"

           Mere presence of QEMU file locking options breaks NBD (Block
           protocol 'nbd' doesn't support the option 'locking')

           ./configure --disable-ocaml breaks building common/mlpcre which
           breaks building daemon

           [RFE]Should update some vddk info in v2v man page

           virt-v2v: warning: ova disk has an unknown VMware controller type

           virt-v2v '-i ova' is not parsing the MAC address from the source

           virt-builder fails to parse repo file if it has blank space after
           the repository identifier

           Failed to convert the rhel5 guest with kmod-xenpv installed from
           xen server by virt-v2v

           qemu-kvm fails to open qcow2 files in read-only mode with qemu-kvm

           Error info shows wrong sometimes when ssh to conversion server
           using non-root user with sudo on p2v client

           /dev/shm does not exist in the appliance environment

           guestfish cannot list commands from interactive mode

           Unbound constructor Hivex.OPEN_UNSAFE

           bump debian images to use single-partition layout

           virt-resize failed to expand swap partition for RHEL5.11 guest
           image with "parsing UUID failed"

           Running file API on a special chardev may hang forever

           inspect-os  report error: could not parse integer in version
           number: V7Update2

           [RFE]Add warning in process of v2v converting guest which has pci
           passthrough device

           virt-v2v fails on opensuse 13.2 guest with error: statns:
           statns_stub: path must start with a / character

           firstboot scripts are not correctly installed in Fedora 26

           Libguestfs should pass copyonread flag through to the libvirt XML

           1.36.x build failure: gtkdocize fails using newer autotools due to
           missing GTK_DOC_CHECK in configure.ac

           guestfs_shutdown hangs if main process sets signal handlers

           guestfs_add_domain_argv fails with readonly option when vdi/vhd
           disk is attached to libvirt domain

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

           document URI format for -a parameters of tools

           RFE: Support multicore decompression for OVA files using pigz and

           Win 2016 guest is described as Win 10 after imported to RHEVM

           RFE: ability to convert VMware virtual machines via vmx

           Please drop or update GnuPG (1.4.x) dependency

           [RFE] Install Windows virtio-rng drivers on VMs imported

           virt-inspector can't get icon info from altlinux-centaurus

           policycoreutils setfiles >= 2.6 does .. nothing

           Windows 8 UEFI from VMware to KVM fails to boot after conversion

           There is error info about "No such file or directory" when convert
           a guest from ova file by v2v

           virt-dib should generate sha256 checksum instead of sha512

           RFE: OVMF should be detected on conversion server to prevent failed

           Should rename network name of rhv in virt-v2v man page

           virt-sysprep should remove DHCP_HOSTNAME

           QEMU image file locking (libguestfs)

           [Debian] Missing db_dump abort inspection

           Segmentation fault when reading corrupted path with Python 3

           RFE: virt-p2v should support mnemonic operations

           There is virt-v2v warning about <listen type='none'> during
           converting a guest which has listen type='none' in XML

           qemu-system-s390x: -device
           isa-serial,chardev=charserial0,id=serial0: 'isa-serial' is not a
           valid device model name

           selinux relabel fails on RHEL 6.2 guests with "libguestfs error:
           selinux_relabel: : Success"

           Missing bash completion scripts for: virt-diff guestunmount virt-
           copy-in virt-copy-out virt-customize virt-get-kernel
           virt-p2v-make-disk virt-p2v-make-kickstart virt-tar-in virt-tar-out
           virt-v2v-copy-to-local virt-win-reg

           RFE: virt-sysprep does not utilize libguestfs encryption support

           [RFE]virt-v2v failed to convert VMware ESX VM with snapshot

           Modify a file in virt-rescue with vi on some linux terminal such as
           yakuake, can lead to abnormal display in virt-rescue shell

           Remove "If reporting bugs, run virt-v2v with debugging enabled .."
           message when running virt-p2v

           Can not end a running command in virt-rescue by press ^C or other
           keys, the only way is to exit virt-rescue

Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-top is 'top' for virtual machines.  Tiny program with many
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