Debian systems may run the 'systemd-logind' daemon, which causes the
/sys/fs/cgroup/systemd mount to be setup, but no other cgroup
controllers are created. While the LXC driver considers cgroups to
be mandatory, the QEMU driver is supposed to accept them as optional.
We detect whether they are present by looking in /proc/mounts for
any mounts of type 'cgroups', but this is not sufficient. We need to
skip any named mounts (as seen by a name=XXX string in the mount
options), so that we only detect actual resource controllers.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=721979
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The polkit access driver used the wrong permission names for checks
on storage pools, volumes and node devices. This led to them always
being denied access.
The 'dettach' permission was also mis-spelt and should have been
'detach'. While permission names are ABI sensitive, the fact that
the code used the wrong object name for checking node device
permissions, means that no one could have used the mis-spelt
'dettach' permission.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
https://bugzilla.redhat.com/show_bug.cgi?id=1006864
Commit 38ab1225 changed the default value of ret from true to false but
forgot to set ret = true when job is NONE. Thus, virsh domjobinfo
returned 1 when there was no job running for a domain but it used to
(and should) return 0 in this case.
First make sure that the input is xhtml as the stylesheets expect
namespaced element, then use a span element instead of a as a
is treated specially, finally adjust the makefile to check for
the new span element and replace it with the PHP code
This fixes the description of virConnectGetType() API function in
API documentation to match the real functionality that it can be
used to get driver name, and provide a hint on how to learn about
full capabilities.
Signed-off-by: Michal Novotny <minovotn@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Commits 9298bfb and f6c2951 both tried to make it possible to
select the correct libnl (1 vs. 3) according to what netcf
used, when both libraries are installed. This works to avoid
libnl-3 when netcf used libnl-1. But on the converse side, if
only libnl-1 development code is installed, while netcf uses
libnl-3, then configure happily uses libnl-1 anyways, leading
to a test failure:
$ VIR_TEST_DEBUG=1 ./virdrivermoduletest
TEST: virdrivermoduletest
1) Test driver "network" ... OK
2) Test driver "storage" ... OK
3) Test driver "nodedev" ... OK
4) Test driver "secret" ... OK
5) Test driver "nwfilter" ... OK
6) Test driver "interface"
... lt-virdrivermoduletest: route/tc.c:973: rtnl_tc_register: Assertion
`0' failed.
Aborted
It's much nicer to prevent this at configure time, by requiring that
if we know what netcf used, then we want the same libnl version. As
before, this can be bypassed by someone who knows what they are doing
by setting LIBNL_CFLAGS (perhaps useful to the rare person where the
build box has a different version of netcf than the installation box).
* configure.ac (LIBNL): If we can prove netcf used libnl-3, then
don't let configure succeed with libnl-1.
Signed-off-by: Eric Blake <eblake@redhat.com>
The change to query org.freedesktop.DBus.ListActivatableNames
to detect systemd broke the test suite, since we did not have
stubs to respond to this dbus call.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This patch introduces virDBusIsServiceEnabled, we can use
this method to get if the service is supported.
In one case, if org.freedesktop.machine1 is unavailable on
host, we should skip creating machine through systemd.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
The devpts, dev and fuse filesystems are mounted temporarily.
there is no need to export them to container if container shares
the root directory with host.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
Commit ef5d51d fixed a crash for numatune with auto placement and
nodeset specified:
<numatune>
<memory mode='preferred' placement='auto' nodeset='0'/>
</numatune>
Mention that user namespace can be enabled using the UID/GID
mapping schema.
Fix typo in link anchor for container args in domain XML docs.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Some users in Ubuntu/Debian seem to have a setup where all the
cgroup controllers are mounted on /sys/fs/cgroup rather than
any /sys/fs/cgroup/<controller> name. In the loop which detects
which controllers are present for a mount point we were modifying
'mnt_dir' field in the 'struct mntent' var, but not always restoring
the original value. This caused detection to break in the all-in-one
mount setup.
Fix that logic bug and add test case coverage for this mount
setup.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
After freeing the bitmap pointer, it must set the pointer to NULL.
This will avoid any other use of the freed memory of the bitmap pointer.
https://bugzilla.redhat.com/show_bug.cgi?id=1006710
Signed-off-by: Liuji (Jeremy) <jeremy.liu@huawei.com>
Jonathan Lebon reported an issue to me off-list about his build
failing to use qemu because he failed to install yajl-devel. But
I recalled specifically tweaking configure.ac to die in that
situation (commits 350583c, ba9c38b). After a bit more
head-scratching, we found the cause of the regression: commit
654c709 rearranged things so that the qemu version check now
occurs before AC_ARG_WITH has had a chance to set either
$with_qemu or $with_yajl.
Coincidentally, this fix aligns with a documentation patch that
was just posted to the autoconf mailing list :)
http://thread.gmane.org/gmane.comp.sysutils.autoconf.patches/8324
* m4/virt-lib.m4 (LIBVIRT_CHECK_LIB, LIBVIRT_CHECK_LIB_ALT)
(LIBVIRT_CHECK_PKG): Populate defaults earlier.
* configure.ac (AC_ARG_WITH): Likewise for drivers.
Signed-off-by: Eric Blake <eblake@redhat.com>
Autoconf states that AC_HELP_STRING is obsolete, and that new
programs should use AS_HELP_STRING. We also had instances of
not properly quoting the macro usage, and not relying on autoconf's
word-wrapping abilities to avoid long lines. I validated that this
commit has no impact to the generated configure file.
* configure.ac (AC_ARG_WITH, AC_ARG_ENABLE): Autoconf recommends
the use of AS_HELP_STRING. Also, use proper quoting and wrap long
lines.
* m4/virt-apparmor.m4 (LIBVIRT_CHECK_APPARMOR): Likewise.
* m4/virt-selinux.m4 (LIBVIRT_CHECK_SELINUX): Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
Osier Yang pointed out that ever since commit 31cb030, the
signature of qemuDomainObjEndJob was changed to return a bool.
While comparison against 0 or > 0 still gives the right results,
it looks fishy; we also had one place that was comparing < 0
which is effectively dead code.
* src/qemu/qemu_migration.c (qemuMigrationPrepareAny): Fix dead
code bug.
(qemuMigrationBegin): Use more canonical form of bool check.
* src/qemu/qemu_driver.c (qemuAutostartDomain)
(qemuDomainCreateXML, qemuDomainSuspend, qemuDomainResume)
(qemuDomainShutdownFlags, qemuDomainReboot, qemuDomainReset)
(qemuDomainDestroyFlags, qemuDomainSetMemoryFlags)
(qemuDomainSetMemoryStatsPeriod, qemuDomainInjectNMI)
(qemuDomainSendKey, qemuDomainGetInfo, qemuDomainScreenshot)
(qemuDomainSetVcpusFlags, qemuDomainGetVcpusFlags)
(qemuDomainRestoreFlags, qemuDomainGetXMLDesc)
(qemuDomainCreateWithFlags, qemuDomainAttachDeviceFlags)
(qemuDomainUpdateDeviceFlags, qemuDomainDetachDeviceFlags)
(qemuDomainBlockResize, qemuDomainBlockStats)
(qemuDomainBlockStatsFlags, qemuDomainMemoryStats)
(qemuDomainMemoryPeek, qemuDomainGetBlockInfo)
(qemuDomainAbortJob, qemuDomainMigrateSetMaxDowntime)
(qemuDomainMigrateGetCompressionCache)
(qemuDomainMigrateSetCompressionCache)
(qemuDomainMigrateSetMaxSpeed)
(qemuDomainSnapshotCreateActiveInternal)
(qemuDomainRevertToSnapshot, qemuDomainSnapshotDelete)
(qemuDomainQemuMonitorCommand, qemuDomainQemuAttach)
(qemuDomainBlockJobImpl, qemuDomainBlockCopy)
(qemuDomainBlockCommit, qemuDomainOpenGraphics)
(qemuDomainGetBlockIoTune, qemuDomainGetDiskErrors)
(qemuDomainPMSuspendForDuration, qemuDomainPMWakeup)
(qemuDomainQemuAgentCommand, qemuDomainFSTrim): Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
Automake 2.0 will enable subdir-objects by default; in preparation
for that change, automake 1.14 outputs LOADS of warnings:
daemon/Makefile.am:38: warning: source file '../src/remote/remote_protocol.c' is in a subdirectory,
daemon/Makefile.am:38: but option 'subdir-objects' is disabled
automake-1.14: warning: possible forward-incompatibility.
automake-1.14: At least a source file is in a subdirectory, but the 'subdir-objects'
automake-1.14: automake option hasn't been enabled. For now, the corresponding output
automake-1.14: object file(s) will be placed in the top-level directory. However,
automake-1.14: this behaviour will change in future Automake versions: they will
automake-1.14: unconditionally cause object files to be placed in the same subdirectory
automake-1.14: of the corresponding sources.
automake-1.14: You are advised to start using 'subdir-objects' option throughout your
automake-1.14: project, to avoid future incompatibilities.
daemon/Makefile.am:38: warning: source file '../src/remote/lxc_protocol.c' is in a subdirectory,
daemon/Makefile.am:38: but option 'subdir-objects' is disabled
...
As automake 1.9 also supported this option, and the previous patches
fixed up the code base to work with it, it is safe to now turn it on
unconditionally.
* configure.ac (AM_INIT_AUTOMAKE): Enable subdir-objects.
* .gitignore: Ignore .dirstamp directories.
* src/Makefile.am (PDWTAGS, *-protocol-struct): Adjust to
new subdir-object location of .lo files.
Signed-off-by: Eric Blake <eblake@redhat.com>
We have been adding new .x files without keeping the list of
*-structs files up-to-date. This adds the support for the
recent additions.
In the process of testing this, I also noticed that Fedora 19's
use of dwarves-1.10 (providing pdwtags version 1.9) was producing
a single line on stderr but still giving enough useful info on
stdout that we could check structs; the real goal of checking
stderr separately from stdout was to avoid the bug in dwarves-1.9
where stdout was empty (see bug http://bugzilla.redhat.com/772358).
* src/Makefile.am (struct_prefix, PROTOCOL_STRUCTS): Add missing
struct tests.
(PDWTAGS): Work with Fedora 19 pdwtags.
(lxc_monitor_protocol-struct, lock_protocol-struct): New rules.
* src/lxc_monitor_protocol-structs: New file.
* src/lock_protocol-structs): Likewise.
* cfg.mk (generated_files): Enlarge list.
Signed-off-by: Eric Blake <eblake@redhat.com>
If we use subdir-objects with automake, any reference to a
cross-directory .c file will result in automake creating
rules that track dependency in the cross directory. But this
presents a problem during 'make distclean' - if the cross
directory is cleaned up first, then the daemon directory will
be left with dangling references to .Po dependency files that
no longer exist.
Meanwhile, referring to the cross-directory .c file means
that we are compiling the file twice - once in src, and once
in daemon. Better is to compile just once in src into a
convenience library, and then use that library from daemon.
The tests directory had a similar situation of a cross-directory
.c file; to solve that, we actually need a convenience library.
* daemon/Makefile.am (DAEMON_SOURCES): Drop .c files...
(libvirtd_LDADD): ...and instead use library.
(libvirtd_conf_la_SOURCES): Declare a new convenience library.
(libvirtd_LDFLAGS): Drop duplicate flag.
* tests/Makefile.am (libvirtdconftest_SOURCES): Drop .c file...
(libvirtdconftest_LDADD): ..and instead use library.
Signed-off-by: Eric Blake <eblake@redhat.com>
Trying to enable automake's subdir-objects option resulted in
the creation of literal directories such as src/$(srcdir)/remote/.
I traced this to the fact that we had used a literal $(srcdir)
in a location that later fed an automake *_SOURCES variable.
This has also been reported as an automake bug:
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=13928
but it's better to fix our code than to wait for an automake fix.
Some things to remember that affect VPATH builds, and where an
in-tree build is blissfully unaware of the issues: if a VPATH
build fails to find a file that was used as a prereq of any
other target, then the rule for that file will expand $@ to
prefer the current build dir (bad because a VPATH build on a
fresh checkout will then stick $@ in the current directory
instead of the desired srcdir); conversely, if a VPATH build
finds the file in srcdir but decides it needs to be rebuilt,
then the rule for that file will expand $@ to include the
directory where it was found out-of-date (bad for an explicit
listing of $(srcdir)/$@ because an incremental VPATH build will
then expand srcdir twice). As we want these files to go into
srcdir unconditionally, we have to massage or avoid $@ for any
recipe that involves one of these files.
Therefore, this patch removes all uses of $(srcdir) from any
generated file name that later feeds a *_SOURCES variable, and
then rewrites all the recipes to generate those files to
hard-code their creation into srcdir without the use of $@.
* src/Makefile.am (REMOTE_DRIVER_GENERATED): Drop $(srcdir); VPATH
builds know how to find the files, and automake subdir-objects
fails with it in place.
(LXC_MONITOR_PROTOCOL_GENERATED, (LXC_MONITOR_GENERATED)
(ACCESS_DRIVER_GENERATED, LOCK_PROTOCOL_GENERATED): Likewise.
(*_client_bodies.h): Hard-code rules to write into srcdir, as
VPATH tries to build $@ locally if missing.
(util/virkeymaps.h): Likewise.
(lxc/lxc_monitor_dispatch.h): Likewise.
(access/viraccessapi*): Likewise.
(locking/lock_daemon_dispatch_stubs.h): Likewise.
* daemon/Makeflie.am (DAEMON_GENERATED, remote_dispatch.h):
Likewise.
Signed-off-by: Eric Blake <eblake@redhat.com>
fixup DAEMON_GENERATED
Failure to attach to a domain during 'virsh qemu-attach' left
the list of domains in an odd state:
$ virsh qemu-attach 4176
error: An error occurred, but the cause is unknown
$ virsh list --all
Id Name State
----------------------------------------------------
2 foo shut off
$ virsh qemu-attach 4176
error: Requested operation is not valid: domain is already active as 'foo'
$ virsh undefine foo
error: Failed to undefine domain foo
error: Requested operation is not valid: cannot undefine transient domain
$ virsh shutdown foo
error: Failed to shutdown domain foo
error: invalid argument: monitor must not be NULL
It all stems from leaving the list of domains unmodified on
the initial failure; we should follow the lead of createXML
which removes vm on failure (the actual initial failure still
needs to be fixed in a later patch, but at least this patch
gets us to the point where we aren't getting stuck with an
unremovable "shut off" transient domain).
While investigating, I also found a leak in qemuDomainCreateXML;
the two functions should behave similarly. Note that there are
still two unusual paths: if dom is not allocated, the user will
see an OOM error even though the vm remains registered (but oom
errors already indicate tricky cleanup); and if the vm starts
and then quits again all before the job ends, it is possible
to return a non-NULL dom even though the dom will no longer be
useful for anything (but this at least lets the user know their
short-lived vm ran).
* src/qemu/qemu_driver.c (qemuDomainCreateXML): Don't leak vm on
failure to obtain job.
(qemuDomainQemuAttach): Match cleanup of qemuDomainCreateXML.
Signed-off-by: Eric Blake <eblake@redhat.com>
ARM v7 can operate in either little or big endian modes. Add
support for the big-endian version known as armv7b from uname.
Signed-off-by: Yogesh Tillu <tillu.yogesh@gmail.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Currently, only X86 provides users CPU features with CPUID instruction.
If users specify the features for non-x86, it should tell users to
remove them.
This patch is to report one error if features are specified by
users for non-x86 platform.
Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
While debugging a failure of 'virsh qemu-attach', I noticed that
we were leaking the count of active domains on failure. This
means that a libvirtd session that is supposed to quit after
active domains disappear will hang around forever.
* src/qemu/qemu_process.c (qemuProcessAttach): Undo count of
active domains on failure.
Signed-off-by: Eric Blake <eblake@redhat.com>
In Fedora 19, 'qemu-kvm' is a simple wrapper that calls
'qemu-system-x86_64 -machine accel=kvm'. Attempting
to use 'virsh qemu-attach $pid' to a machine started as:
qemu-kvm -cdrom /var/lib/libvirt/images/foo.img \
-monitor unix:/tmp/demo,server,nowait -name foo \
--uuid cece4f9f-dff0-575d-0e8e-01fe380f12ea
was failing with:
error: XML error: No PCI buses available
because we did not see 'kvm' in the executable name read from
/proc/$pid/cmdline, and tried to assign os.machine as
"accel=kvm" instead of "pc"; this in turn led to refusal to
recognize the pci bus.
Noticed while investigating https://bugzilla.redhat.com/995312
although there are still other issues to fix before that bug
will be completely solved.
I've concluded that the existing parser code for native-to-xml
is a horrendous hodge-podge of ad-hoc approaches; I basically
rewrote the -machine section to be a bit saner.
* src/qemu/qemu_command.c (qemuParseCommandLine): Don't assume
-machine argument is always appropriate for os.machine; set
virtType if accel is present.
Signed-off-by: Eric Blake <eblake@redhat.com>
'virsh domxml-from-native' and 'virsh qemu-attach' could misbehave
for an emulator installed in (a somewhat unlikely) location
such as /usr/local/qemu-1.6/qemu-system-x86_64 or (an even less
likely) /opt/notxen/qemu-system-x86_64. Limit the strstr seach
to just the basename of the file where we are assuming details
about the binary based on its name.
While testing, I accidentally triggered a core dump during strcmp
when I forgot to set os.type on one of my code paths; this patch
changes such a coding error to raise a nicer internal error instead.
* src/qemu/qemu_command.c (qemuParseCommandLine): Compute basename
earlier.
* src/conf/domain_conf.c (virDomainDefPostParseInternal): Avoid
NULL deref.
Signed-off-by: Eric Blake <eblake@redhat.com>
The regular expression used to determine guest capabilities
was compiled in libxlCapsInitHost() but used in libxlCapsInitGuests().
Move compilation to libxlCapsInitGuests() where it is used, and free
the compiled regex after use. Ensure not to free the regex if
compilation fails.
Several recent patches cleaned up 'make rpm' for the situation
when client_only is true; these were done by manual spec file
editing (since it's relatively hard to come by a RHEL 5 s390
box). Make it easier to do in the future via a simpler command
line override.
* libvirt.spec.in (client_only): Allow for override.
Signed-off-by: Eric Blake <eblake@redhat.com>
I'm tired of seeing screenfuls of messages like these when using
automake 1.13 (Fedora 19):
configure.ac:2121: warning: The 'AM_PROG_MKDIR_P' macro is deprecated, and its use is discouraged.
configure.ac:2121: You should use the Autoconf-provided 'AC_PROG_MKDIR_P' macro instead,
configure.ac:2121: and use '$(MKDIR_P)' instead of '$(mkdir_p)'in your Makefile.am files.
daemon/Makefile.am:19: warning: 'INCLUDES' is the old name for 'AM_CPPFLAGS' (or '*_CPPFLAGS')
seeing as how we MUST use those constructs for the benefit of
automake 1.9 (RHEL 5). Conversely, RHEL 5 automake complained:
aclocal:configure.ac:36: warning: macro `AM_SILENT_RULES' not found in library
Obviously, I tested this patch on both Fedora 19 and RHEL 5.
* configure.ac (AM_INIT_AUTOMAKE): Avoid obsoletion warnings.
(AM_SILENT_RULES): Avoid unknown macro warning.
Signed-off-by: Eric Blake <eblake@redhat.com>
Commits 905629f4 and 1716e7a6 have added support for specifying
an IPv4 range and a port range to be used by NAT:
<forward mode='nat'>
<nat>
<address start='10.20.30.40' end='10.20.30.44'/>
<port start='60000' end='65432'/>
</nat>
</forward>
https://bugzilla.redhat.com/show_bug.cgi?id=1004364
On Power platform, Power7+ can support Power7 guest.
It needs to define XML configuration to specify guest's CPU model.
For exmaple:
<cpu match='exact'>
<model>POWER7_v2.1</model>
<vendor>IBM</vendor>
</cpu>
Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
CPU features are not supported on non-x86 and hasFeatures will be NULL.
This patch is to remove CPU features functions calling to avoid errors.
Signed-off-by: Li Zhang <zhlcindy@linux.vnet.ibm.com>
This patch changes virFileLoopDeviceOpen() to use the new loop-control
device to allocate a new loop device. If this behavior is unsupported
we fall back to the previous method of searching /dev for a free device.
With this patch you can start as many image based LXC domains as you
like (well almost).
Fixes bug https://bugzilla.redhat.com/show_bug.cgi?id=995543
Right now, securityfs is disallowed to be mounted in non-initial
user namespace, so we must avoid trying to mount securityfs in
a container which has user namespace enabled.
Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com>
The ESX code has a method esxVI_Alloc which would call
virAllocN directly, instead of using the VIR_ALLOC_N
macro. Remove this method and make the callers just
use VIR_ALLOC as is normal practice.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
Delete the USB controller check from the USB Device checklist in
virDomainDeviceIsUSB as USB controller is a PCI device rather than
a USB one.
Signed-off-by: Liu Ji <jeremy.liu@huawei.com>
The s390, ppc and arm CPU drivers never set the 'arch' field
in their impl of cpuArchNodeData. This leads to error messages
being reported from cpuDataFree later, due to trying to use
VIR_ARCH_NONE.
#0 virRaiseErrorFull (filename=filename@entry=0x76f94434 "cpu/cpu.c", funcname=funcname@entry=0x76f942dc <__FUNCTION__.18096> "cpuGetSubDriver", linenr=linenr@entry=58,
domain=domain@entry=31, code=code@entry=1, level=level@entry=VIR_ERR_ERROR, str1=0x76f70e18 "internal error: %s",
str2=str2@entry=0x7155f2ec "undefined hardware architecture", str3=str3@entry=0x0, int1=int1@entry=-1, int2=int2@entry=-1, fmt=0x76f70e18 "internal error: %s")
at util/virerror.c:646
#1 0x76e682ea in virReportErrorHelper (domcode=domcode@entry=31, errorcode=errorcode@entry=1, filename=0x76f94434 "cpu/cpu.c",
funcname=0x76f942dc <__FUNCTION__.18096> "cpuGetSubDriver", linenr=linenr@entry=58, fmt=0x76f7e7e4 "%s") at util/virerror.c:1292
#2 0x76ed82d4 in cpuGetSubDriver (arch=<optimized out>) at cpu/cpu.c:57
#3 cpuGetSubDriver (arch=VIR_ARCH_NONE) at cpu/cpu.c:51
#4 0x76ed8818 in cpuDataFree (data=data@entry=0x70c22d78) at cpu/cpu.c:216
#5 0x716aaec0 in virQEMUCapsInitCPU (arch=VIR_ARCH_ARMV7L, caps=0x70c29a08) at qemu/qemu_capabilities.c:867
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The VIR_FREE() macro will cast away any const-ness. This masked a
number of places where we passed a 'const char *' string to
VIR_FREE. Fortunately in all of these cases, the variable was not
in fact const data, but a heap allocated string. Fix all the
variable declarations to reflect this.
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
No need to open code now that we have a nice function.
Interestingly, our virStringFreeList function is typed correctly
(a malloc'd list of malloc'd strings is NOT const, whether at the
point where it is created, or at the point where it is cleand up),
so using it with a 'const char **' argument would require a cast
to keep the compiler. I chose instead to remove const from code
even where we don't modify the argument, just to avoid the need
to cast.
* src/qemu/qemu_command.h (qemuParseCommandLine): Drop declaration.
* src/qemu/qemu_command.c (qemuParseProcFileStrings)
(qemuStringToArgvEnv): Don't force malloc'd result to be const.
(qemuParseCommandLinePid, qemuParseCommandLineString): Simplify
cleanup.
(qemuParseCommandLine, qemuFindEnv): Drop const-correctness to
avoid the need to cast in callers.
Signed-off-by: Eric Blake <eblake@redhat.com>
In commit 991270db99 I've used virDomainNetGetActualHostdev() to get
the actual hostdev from a network when removing the network from the
list to avoid leaving the hostdev in the list. I didn't notice that this
function doesn't check if the actual network is allocated and
dereferences it. This crashes the daemon when cleaning up a domain
object in early startup phases when the actual network definition isn't
allocated. When the actual definition isn't present, the hostdev that
might correspond to it won't be present anyways so it's safe to return
NULL.
Thanks to Cole Robinson for noticing this problem.
