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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.
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Eric Blake d219826c65 maint: improve VIR_ERR_OPERATION_DENIED usage 
Some of our operation denied messages are outright stupid; for
example, if virIdentitySetAttr fails:

error: operation Identity attribute is already set forbidden for read only access

This patch fixes things to a saner:

error: operation forbidden: Identity attribute is already set

It also consolidates the most common usage pattern for operation
denied errors: read-only connections preventing a public API.  In
this case, 'virsh -r -c test:///default destroy test' changes from:

error: operation virDomainDestroy forbidden for read only access

to:

error: operation forbidden: read only access prevents virDomainDestroy

Note that we were previously inconsistent on which APIs used
VIR_FROM_DOM (such as virDomainDestroy) vs. VIR_FROM_NONE (such as
virDomainPMSuspendForDuration).  After this patch, all uses
consistently use VIR_FROM_NONE, on the grounds that it is unlikely
that a caller learning that a call is denied can do anything in
particular with extra knowledge which error domain the call belongs
to (similar to what we did in commit baa7244).

* src/util/virerror.c (virErrorMsg): Rework OPERATION_DENIED error
message.
* src/internal.h (virCheckReadOnlyGoto): New macro.
* src/util/virerror.h (virReportRestrictedError): New macro.
* src/libvirt-lxc.c: Use new macros.
* src/libvirt-qemu.c: Likewise.
* src/libvirt.c: Likewise.
* src/locking/lock_daemon.c (virLockDaemonClientNew): Likewise.

Signed-off-by: Eric Blake <eblake@redhat.com>
2014-01-06 08:29:29 -07:00
.gnulib@c7802e2b41 maint: update to latest gnulib 2014-01-01 06:02:47 -07:00
build-aux maint: enforce comma style usage 2013-11-20 09:24:18 -07:00
daemon Add network events to the remote driver 2013-12-11 13:26:25 +00:00
docs snapshot: schema: Split out snapshot disk driver definition 2013-12-19 10:20:56 +01:00
examples event-test: Unregister close callback 2013-12-24 17:18:34 +01:00
gnulib maint: update to latest gnulib 2014-01-01 06:02:47 -07:00
include docs: improve event-related documentation 2013-12-19 09:45:50 -07:00
m4 aarch64: Disable -fstack-protector. 2014-01-01 14:21:21 +00:00
po Extracted common parts of domain_event.[ch] to object_event.[ch] 2013-12-10 13:12:35 +00:00
src maint: improve VIR_ERR_OPERATION_DENIED usage 2014-01-06 08:29:29 -07:00
tests Fix explicit usage of default video PCI slots 2014-01-06 09:31:32 +01:00
tools virkeycode: Allow ANSI_A 2013-12-24 17:36:47 +01:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore examples: Resurrect domsuspend example 2013-12-24 17:17:35 +01:00
.gitmodules make .gnulib a submodule 2009-07-08 16:17:51 +02:00
.mailmap Autogenerate AUTHORS 2012-10-19 12:44:56 -04:00
AUTHORS.in Add John Ferlan to the committers list 2013-02-05 10:59:32 -05:00
autobuild.sh Remove python binding 2013-11-25 16:08:00 +00:00
autogen.sh autogen.sh: Correctly detect .git as a file 2013-08-29 13:19:45 +02:00
bootstrap maint: update to latest gnulib 2014-01-01 06:02:47 -07:00
bootstrap.conf Add helpers for getting env vars in a setuid environment 2013-10-21 14:03:52 +01:00
cfg.mk examples: Resurrect domsuspend example 2013-12-24 17:17:35 +01:00
ChangeLog-old maint: typo fixes 2013-10-22 16:49:32 +01:00
config-post.h build: fix build of virt-login-shell on systems with older gnutls 2013-10-22 09:41:50 -06:00
configure.ac examples: Resurrect domsuspend example 2013-12-24 17:17:35 +01:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
HACKING maint: enforce comma style usage 2013-11-20 09:24:18 -07:00
libvirt.pc.in Add missing 'libvirt_lxc_api' variable in pkg-config file 2013-09-04 14:52:40 +01:00
libvirt.spec.in examples: Resurrect domsuspend example 2013-12-24 17:17:35 +01:00
Makefile.am examples: Resurrect domsuspend example 2013-12-24 17:17:35 +01:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
mingw-libvirt.spec.in Remove python binding 2013-11-25 16:08:00 +00:00
README Correct typos in the documentation (Atsushi SAKAI) 2008-01-24 10:15:13 +00:00
README-hacking maint: relax git minimum version 2010-02-24 14:29:27 -05:00
run.in Remove python binding 2013-11-25 16:08:00 +00:00
TODO Update todo list file to point at bugzilla/website 2010-10-13 16:45:26 +01:00

README 

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>