| guestfs-release-notes-1.24(1) | Virtualization Support | guestfs-release-notes-1.24(1) |
guestfs-release-notes - libguestfs Release Notes
These release notes only cover the differences from the previous stable/dev branch split (1.22.0). For detailed changelogs, please see the git repository, or the ChangeLog file distributed in the tarball.
User-Mode Linux (UML) can be used as an alternative backend (ie. instead of KVM). This improves performance especially when using libguestfs inside a VM (eg. in the cloud). UML is supported as a first-class backend. See "USER-MODE LINUX BACKEND" in guestfs(3) for how to use this.
ARM (32 bit) and PPC64 are now fully supported.
Tools
virt-builder(1) is a new tool for building virtual machine images. It lets you rapidly and securely create guests and customize them.
New virt-sysprep(1) operations: Remove files in /tmp and /var/tmp. Remove RPM database files. Change root and user passwords. More log files are removed. New operations which are not enabled by default: Create random UUIDs for filesystems. Reset firewall rules. (Wanlong Gao)
virt-resize(1) and virt-sysprep can now use URIs to specify a remote disk.
Use "guestfish -N filename=type" to create a named disk image (instead of the default test1.img etc).
virt-sparsify(1) now tests if there is enough disk space to complete the operation, instead of possibly running out of space half way through.
virt-format(1) and virt-make-fs(1): new --label option for setting filesystem label.
virt-resize --no-sparse flag can be used to resize on to partitions and other targets that are not zeroed.
Language bindings
New bindings for the Go programming language.
API
Support for the systemd journal.
"guestfs_add_drive_opts" can now control the qemu caching mode through a new "cachemode" parameter. You can select improved performance for temporary drives, or safety.
"guestfs_set_label" now works for XFS and btrfs.
New GUESTFS_EVENT_WARNING event for warning messages.
Inspection
Better inspection of SUSE guests (Olaf Hering).
Better support for non-standard Windows %systemroot% (Matthew Booth).
Enhanced error reporting for Augeas errors.
A denial of service was possible when inspecting certain guests. The fix has been backported to 1.20 and 1.22 branches.
Fix insecure temporary directory handling for remote guestfish. The fix has been backported to 1.20 and 1.22 branches.
add-drive-scratch: Add a temporary scratch drive aug-label aug-setm journal-open: Systemd journal support journal-close journal-next journal-skip journal-get journal-get-data-threshold journal-set-data-threshold remount: Allow rw flag to be adjusted on mounted filesystems set-uuid: Set UUID of filesystem
"is-file", "is-dir", "is-blockdev", "is-chardev", "is-fifo", "is-socket" APIs now have an extra "followsymlinks" flag.
"add-drive" has a new "cachemode" parameter.
The following packages are required to build libguestfs 1.24:
The following optional packages may be added to enhance functionality but are not required:
New "make check-*" rules replace "make extra-tests". See "make help" and guestfs(3) for details.
Perl code can now be valgrinded.
Inspection code is now fuzz-tested.
"make" no longer recurses into the generator directory in every other directory. This reduces the overhead of builds considerably.
Additional tests for Augeas, hivex.
Add a launch timeout of 20 minutes waiting for the appliance to start up.
Add a timeout (4 hours) to all tests so we can catch the case where qemu or other components hang.
Use kvmclock and "-cpu host". This improves clock stability and overall performance.
"./configure --enable-packet-dump" mode is fixed.
"./configure --enable-valgrind-daemon" mode has been rewritten. It is now feasible for developers to keep this flag enabled at all times.
Backends have been refactored to be modular (although they are not actually loadable modules).
When enabled, the network now uses resolver configuration (ie. /etc/resolv.conf) from the host.
guestfs-examples(1), guestfs-faq(1), guestfs-performance(1), guestfs-recipes(1), guestfs-testing(1), guestfs(3), guestfish(1), http://libguestfs.org/
Richard W.M. Jones
Copyright (C) 2009-2020 Red Hat Inc.
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:
| 2021-01-05 | libguestfs-1.44.0 |