The core of these two functions is very similar and most of it is even
exactly the same. Factor out the core functionality into a separate
function to remove code duplication and make further changes easier.

This patch allows owner's UID to be changed as well.

So that callers can change the default value.

* src/rpc/virnetsocket.c, src/rpc/virnetsocket.h: Add
  virNetSocketDupFD()
* src/rpc/virnetclient.c, src/rpc/virnetclient.h: Add
  virNetClientDupFD() and virNetClientGetFD()

The function stop() was always returning 0 (OK) from killproc() even
in case of error.

This is introduced by commit df0b57a9, which forgot to
add signal handler for SIGHUP.

A simple reproduce method:

1) Create a domain XML under /etc/libvirt/qemu
2) % kill -SIGHUP $(pidof libvirtd)
3) % virsh list --all (the new created domain XML is not listed)

* .dir-locals.el: Add nxml-mode preferences.

In preparation for storing the domain description with the snapshot,
swap the order of declaration.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>

With gcc 4.5.1:

util/virpidfile.c: In function 'virPidFileAcquirePath':
util/virpidfile.c:308:66: error: nested extern declaration of '_gl_verify_function2' [-Wnested-externs]

Then in tests/commandtest.c, the new virPidFile APIs need to be used.

* src/util/virpidfile.c (virPidFileAcquirePath): Move verify to
top level.
* tests/commandtest.c: Use new pid APIs.

Remove the current libvirtd pidfile handling code, in favour of
calling out to the new APIs. This ensures libvirtd's pidfile
handling is crashsafe

This also means that the non-root libvirtd instances (for handling
qemu:///session URIs) can now safely use pidfiles without racing

* daemon/libvirtd.c: Switch to use virPidFileAcquire and
  virPidFileRelease

In daemons using pidfiles to protect against concurrent
execution there is a possibility that a crash may leave a stale
pidfile on disk, which then prevents later restart of the daemon.

To avoid this problem, introduce a pair of APIs which make
use of virFileLock to ensure crash-safe & race condition-safe
pidfile acquisition & releae

* src/libvirt_private.syms, src/util/virpidfile.c,
  src/util/virpidfile.h: Add virPidFileAcquire and virPidFileRelease

In some cases the caller of virPidFileRead might like extra checks
to determine whether the pid just read is really the one they are
expecting. This adds virPidFileReadIfAlive which will check whether
the pid is still alive with kill(0, -1), and (on linux only) will
look at /proc/$PID/path

* libvirt_private.syms, util/virpidfile.c, util/virpidfile.h: Add
  virPidFileReadIfValid and virPidFileReadPathIfValid
* network/bridge_driver.c: Use new APIs to check PID validity

The functions for manipulating pidfiles are in util/util.{c,h}.
We will shortly be adding some further pidfile related functions.
To avoid further growing util.c, this moves the pidfile related
functions into a dedicated virpidfile.{c,h}. The functions are
also all renamed to have 'virPidFile' as their name prefix

* util/util.h, util/util.c: Remove all pidfile code
* util/virpidfile.c, util/virpidfile.h: Add new APIs for pidfile
  handling.
* lxc/lxc_controller.c, lxc/lxc_driver.c, network/bridge_driver.c,
  qemu/qemu_process.c: Add virpidfile.h include and adapt for API
  renames

Add some simple wrappers around the fcntl() discretionary file
locking capability.

* src/util/util.c, src/util/util.h, src/libvirt_private.syms: Add
  virFileLock and virFileUnlock APIs

Two copy-and-paste bugs in a row.  :(

* tools/virsh.c (cmdUndefine): Also avoid dead store.

Bug introduced in commit 9a0ec363.

* tools/virsh.c (cmdUndefine): Add missing line.

We forgot to add virDomainUndefineFlags for a couple of hypervisors.
This wires up trivial versions (since neither hypervisor supports
managed save yet, they do not need to support any flags).

* src/vbox/vbox_tmpl.c (vboxDomainCreateXML): Update caller.
(vboxDomainUndefine): Move guts...
(vboxDomainUndefineFlags): ...to new function.
* src/xenapi/xenapi_driver.c (xenapiDomainUndefine)
(xenapiDomainUndefineFlags): Likewise.

The public API documents that undefine may be used to transition a
running persistent domain into a transient one.  Many drivers still
do not support this usage, but virsh shouldn't be getting in the
way of those that do support it.

This also drops a redundant conditional; vshCommandOptString
guaranteed that name was non-NULL.

* tools/virsh.c (cmdUndefine): Allow undefine on active domains;
the drivers may still reject it, but it is a valid API usage.
* tests/undefine (error): Fix the test to match.

Currently only tabs and blanks are used for tokenizing the description,
which breaks when a term is at the end of a line or has () appended to
it.
1. Use also other white space characters such as new-lines and carriage
   return for splitting.
2. Remove some common non-word characters from the token before lookup.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>

* remote.html.in: Remove obsolete notes about internals of the
  RPC protocol
* internals/rpc.html.in: Extensive docs on RPC protocol/API
* sitemap.html.in: Add new page

When the description of an entry is too long and needs multiple lines,
all other table cells of the same row are currently vertically aligned
on center. Without row borders or different background colors for
alternating rows this is hard to read.

Change the style-sheet to align the table cells of a row on top.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>

Fix of output of detailed volume list. BZ #727088

Fix internals of libvirt for new storage volume type.
Libvirt reported an invalid type of the volume.

BZ #727088

Down the road, I want to add virDomainSnapshotGetParent, and use
the new API rather than xml scraping; but this virsh command can
be implemented even without the new API.

* tools/virsh.c (cmdSnapshotParent): New command.
* tools/virsh.pod (snapshot-parent): Document it.

Our logic throws off analyzer tools:

ptr var = NULL;
if (flags == 0) flags = live ? _LIVE : _CONFIG;
if (flags & _LIVE) do stuff
if (flags & _CONFIG) var = non-null;
if (flags & _LIVE) do more stuff
else if (flags & _CONFIG) use var

the tools keep thinking that var can still be NULL in the last
if clause, adding the hint shuts them up.

* src/qemu/qemu_driver.c (qemuDomainSetBlkioParameters): Add a
static analysis hint.

While the first encountered dns host record is being parsed, it's
possible for virNetworkDef::hosts to point to memory that has been
allocated, but virNetworkDef::nhosts to still be 0. If there is a
failure during that time, virNetworkDef::hosts will be leaked.

Although this isn't currently the case for virNetworkDef::txtrecords,
it could become that way through future re-factoring, and it hurts
nothing to restructure the freeing of txtrecord data to match that of
hosts data.

When instantiating a filter, a VM may disappear and remove its tap interfaces. Tolerate this case and don't report an error.

The following XML:

    <serial type='udp'>
      <source mode='connect' service='9999'/>
    </serial>

is accepted by domain_conf.c but maps to the qemu command line:

-chardev udp,host=127.0.0.1,port=2222,localaddr=(null),localport=(null)

qemu can cope with everything omitting except the connection port, which
seems to also be the intent of domain_conf validation, so let's not
generate bogus command lines for that case.
The defaults are empty strings for addresses and 0 for the localport

Additionally, tweak the qemu cli parsing to handle omitted host
parameters
for -serial udp

Someone in an IRC channel or an email pointed out a few days ago that
the examples of IPv6 addresses in the libvirt documentation were not
in the officially reserved "documentation" range. This addresses their
concern.

Sometimes, full XML is too much; since most snapshot commands
operate on a snapshot name, there should be an easy way to get
at the current snapshot's name.  For example:

virsh snapshot-revert dom `virsh snapshot-current dom --name`

* tools/virsh.c (cmdSnapshotCurrent): Add an option.
* tools/virsh.pod (snapshot-current): Document it.

Found this working on the next patch to use xpath to parse
arbitrary names back out.

* tools/virsh.c (cmdSnapshotCreateAs): Escape user input.

Transient domains reject attempts to set autostart, and using
virDomainCreate to restart a domain only works on persistent
domains.  Therefore, managed save makes no sense on transient
domains, and should be rejected up front rather than creating
an otherwise unrecoverable managed save file.

Besides, transient domains imply that a lot more management is
being done by the upper layer; this includes the assumption
that the upper layer is okay managing the saved state file
created by virDomainSave, and does not need to use managed save.

* src/libvirt.c: Document that transient domains are incompatible
with managed save.
* src/qemu/qemu_driver.c (qemuDomainManagedSave): Enforce it.
* src/libxl/libxl_driver.c (libxlDomainManagedSave): Likewise.

This should have been done with the rest of the patch for virtual
switch / network device abstraction. If documents the new elements
(and new usage of existing elements) in the <network> XML to support
libvirt networks that use existing host bridges and macvtap direct
connections, as well as the new <portgroup> element.

I noticed some inconsistent use of 'else'.

* src/qemu/qemu_driver.c (qemuCPUCompare)
(qemuDomainSnapshotCreateXML, qemuDomainRevertToSnapshot)
(qemuDomainSnapshotDiscard): Match coding conventions.

If a snapshot with the name already exists, virDomainSnapshotAssignDef()
just returns NULL, in which case the snapshot definition is leaked.
Currently this leak is not a big problem, since qemuDomainSnapshotLoad()
is only called once during initial startup of libvirtd.
Signed-off-by: NPhilipp Hahn <hahn@univention.de>

* .gnulib: Update to latest, for largefile fix.

A previous commit gave the LXC driver the ability to mount
block devices for the container filesystem. Through use of
the loopback device functionality, we can build on this to
support use of plain file images for LXC filesytems.

By setting the LO_FLAGS_AUTOCLEAR flag we can ensure that
the loop device automatically disappears when the container
dies / shuts down

* src/lxc/lxc_container.c: Raise error if we see a file
  based filesystem, since it should have been turned into
  a loopback device already
* src/lxc/lxc_controller.c: Rewrite any filesystems of
  type=file, into type=block, by binding the file image
  to a free loop device

* src/lxc/lxc_controller.c: s/PYT/PTY/