ceb1019257
virDomainSnapshotFindByName(list, NULL) should return NULL, rather than the internal-use-only metaroot. Most existing callers pass in a non-NULL name; the few external callers that don't are immediately calling virDomainMomentSetParent (which indeed needs the metaroot rather than NULL if the parent name is NULL); but as the leaky abstraction is ugly, it is worth instead making virDomainMomentSetParent static and adding a new function for resolving the parent link of a brand new moment within its list. The existing external uses of virDomainMomentSetParent always succeed (either the new moment has parent_name of NULL to become a new root, or has parent_name set to a strdup of the previous current moment); hence, our new function does not need a return value (but it still has a VIR_WARN in case future uses break our assumptions about failure being impossible). Missed when commit 02c4e24d refactored things to attempt to remove direct metaroot manipulations out of the qemu and test drivers into internal-only details, and made more obvious when commit dc8d3dc6 factored it out into a separate file. Signed-off-by: Eric Blake <eblake@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Libvirt API for virtualization
Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
For some of these hypervisors, it provides a stateful management daemon which runs on the virtualization host allowing access to the API both by non-privileged local users and remote users.
Layered packages provide bindings of the libvirt C API into other languages including Python, Perl, PHP, Go, Java, OCaml, as well as mappings into object systems such as GObject, CIM and SNMP.
Further information about the libvirt project can be found on the website:
License
The libvirt C API is distributed under the terms of GNU Lesser General
Public License, version 2.1 (or later). Some parts of the code that are
not part of the C library may have the more restrictive GNU General
Public License, version 2.1 (or later). See the files COPYING.LESSER
and COPYING for full license terms & conditions.
Installation
Libvirt uses the GNU Autotools build system, so in general can be built and installed with the usual commands. For example, to build in a manner that is suitable for installing as root, use:
$ ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/var
$ make
$ sudo make install
While to build & install as an unprivileged user
$ ./configure --prefix=$HOME/usr
$ make
$ make install
The libvirt code relies on a large number of 3rd party libraries. These will
be detected during execution of the configure script and a summary printed
which lists any missing (optional) dependencies.
Contributing
The libvirt project welcomes contributions in many ways. For most components the best way to contribute is to send patches to the primary development mailing list. Further guidance on this can be found on the website:
https://libvirt.org/contribute.html
Contact
The libvirt project has two primary mailing lists:
- libvirt-users@redhat.com (for user discussions)
- libvir-list@redhat.com (for development only)
Further details on contacting the project are available on the website: