The network and nwfilter drivers both have a need to update
firewall rules. The currently share no code for interacting
with iptables / firewalld. The nwfilter driver is fairly
tied to the concept of creating shell scripts to execute
which makes it very hard to port to talk to firewalld via
DBus APIs.

This patch introduces a virFirewallPtr object which is able
to represent a complete sequence of rule changes, with the
ability to have multiple transactional checkpoints with
rollbacks. By formally separating the definition of the rules
to be applied from the mechanism used to apply them, it is
also possible to write a firewall engine that uses firewalld
DBus APIs natively instead of via the slow firewalld-cmd.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

When a VM fails to launch due to error creating nwfilter
rules, we must avoid overwriting the original error when
tearing down the partially created rules.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The nwfilter ebiptables driver will build up commands to run in
two phases. The first phase contains all of the command, except
for the '-A' part. Instead it has a '%c' placeholder, along with
a '%s' placeholder for a position arg. The second phase than
substitutes these placeholders. The only values ever used for
these substitutions though is '-A' and '', so it is entirely
pointless. Remove the second phase entirely, since it will make
it harder to convert to the new firewall APIs
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The current nwfilter tech driver API has a 'createRuleInstance' method
which populates virNWFilterRuleInstPtr with a command line string
containing variable placeholders. The 'applyNewRules' method then
expands the variables and executes the commands. This split of
responsibility won't work when switching to the virFirewallPtr
APIs, since we can't just build up command line strings. This patch
this merges the functionality of 'createRuleInstance' into the
applyNewRules method.

The virNWFilterRuleInstPtr struct is changed from holding an array
of opaque pointers, into holding generic metadata about the rules
to be processed. In essence this is the result of taking a linked
set of virNWFilterDefPtr's and flattening the tree to get a list
of virNWFilterRuleDefPtr's. At the same time we must keep track of
any nested virNWFilterObjPtr instances, so that the locks are held
for the duration of the 'applyNewRules' method.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Later refactoring will change use of the virNWFilterRuleInstPtr struct.
Prepare for this by pushing use of the virNWFilterRuleInstPtr parameter
out of the ebtablesCreateRuleInstance and iptablesCreateRuleInstance
methods. Instead they simply string(s) with the constructed rule data.
The ebiptablesCreateRuleInstance method will make use of the
virNWFilterRuleInstPtr struct instead.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add virNWFilterRuleIsProtocol{Ethernet,IPv4,IPv6} helper methods
to avoid having to write a giant switch statements with many cases.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The 'displayRuleInstance' callback in the nwfilter tech driver
is never invoked, so can be deleted.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The 'removeRules' callback in the nwfilter tech driver is never
invoked, so can be deleted.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virNWFilterHashTable struct contains a virHashTable and
then a 'char **names' field which keeps a copy of all the
hash keys. Presumably this was intended to record the ordering
of the hash keys. No code ever uses this and the ordering is
mangled whenever a variable is removed from the hash, because
the last element in the list is copied into the middle of the
list when shrinking the array.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The 'virDomainNetType' is unused in every impl of the
virNWFilterRuleCreateInstance driver method. Remove it
from the code to avoid the dependancy on the external
enum.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

The virNWFilterTechDriver struct is nothing to do with the nwfilter
XML configuration. It stores data specific to the driver implementation
so should be in a header in the driver directory instead.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

If virNWFilterVarValueCreateSimple fails with OOM, then
'val' will be leaked by virNWFilterVarValueCreateSimpleCopyValue
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Commit c4206d7c fixed the overflow for running domains. However, we need
a similar check when setting migration speed on inactive domains.

At first look, it may seem the check in c4206d7c is now redundant but
qemuDomainMigrateSetMaxSpeed is not the only caller of
qemuMonitorSetMigrationSpeed so we need to check the bandwidth in both
places.

https://bugzilla.redhat.com/show_bug.cgi?id=1083483Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Replace use of cpuMapOverride with virFileFindResource
to locate CPU map from build dir.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Replace virDriverModuleInitialize with virFileFindResource
usage.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Replace virLockManagerSetPluginDir with virFileFindResource
usage.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of hardcoding LIBEXECDIR as the location of the libvirt_iohelper
binary, use virFileFindResource to optionally find it in the current
build directory.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of hardcoding LIBEXECDIR as the location of the libvirt_parthelper
binary, use virFileFindResource to optionally find it in the current
build directory.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of hardcoding LIBEXECDIR as the location of the libvirt_lxc
binary set in the LXC driver capabilities, use virFileFindResource
to optionally find it in the current build directory.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Instead of hardcoding LIBEXECDIR as the location of the libvirt_iohelper
binary, use virFileFindResource to optionally find it in the current
build directory.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add calls to virFileActivateDirOverride so that the build dir
overrides are activated.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Add virFileFindResource which will try to locate files
in the local build tree if the calling binary (eg libvirtd or
test suite) is being run from the build tree. The corresponding
virFileActivateDirOverride should be called at startup passing
in argv[0]. This will be examined for evidence of libtool magic
binary prefix / sub-directory in order to activate the override.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

Each backing store of a given disk is associated with a unique index
(which is also formatted in domain XML) for easier addressing of any
particular backing store. With this patch, any backing store can be
addressed by its disk target and the index. For example, "vdc[4]"
addresses the backing store with index equal to 4 of the disk identified
by "vdc" target. Such shorthand can be used in any API in place for a
backing file path:

    virsh blockcommit domain vda --base vda[3] --top vda[2]
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Returning both virStorageSourcePtr and its path member does not make a
lot of sense.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

virStorageFileChainLookup is able to give use virStorageSourcePtr which
contains the pointer to its canonical path. Let's use a more general
virStorageSourcePtr instead of just canonical path.

Former base_canon maps to baseSource->path.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

virStorageFileChainLookup is able to give use virStorageSourcePtr which
contains the pointer to its canonical path. There's no need for the
caller to store both of them.

Former top_meta maps to topSource and top_canon maps to topSource->path.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Once again, gcc 4.4.7 (hello RHEL) rears its ugly head:

conf/domain_conf.c: In function 'virDomainDiskBackingStoreFormat':
conf/domain_conf.c:14940: error: declaration of 'index' shadows a global declaration [-Wshadow]
/usr/include/string.h:489: error: shadowed declaration is here [-Wshadow]

* src/conf/domain_conf.c (virDomainDiskBackingStoreFormat): Pacify
older gcc.
Signed-off-by: NEric Blake <eblake@redhat.com>

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1019926
Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=868673Signed-off-by: NMartin Kletzander <mkletzan@redhat.com>

This patch implements formating and parsing code for the backing store
schema defined and documented by the previous patch.

This patch does not aim at providing full persistent storage of disk
backing chains yet. The formatter is supposed to provide the backing
chain detected when starting a domain and thus it is not formatted into
an inactive domain XML. The parser is implemented mainly for the purpose
of testing the XML generated by the formatter and thus it does not
distinguish between no backingStore element and an empty backingStore
element. This will have to change once we fully implement support for
user-supplied backing chains.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>

Recent discussions around naming of 'pci' vs 'pci.0' for PPC
made me go back and look at the PPC emulator in every historical
version of QEMU since 1.0. The results were worse than I imagined.
This patch adds the logic required to make libvirt work with PPC
correctly with naming variations across all versions & machine
types.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

To avoid having the root of a backing chain present twice in the list we
need to invert the working of virStorageFileGetMetadataRecurse.

Until now the recursive worker created a new backing chain element from
the name and other information passed as arguments. This required us to
pass the data of the parent in a deconstructed way and the worker
created a new entry for the parent.

This patch converts this function so that it just fills in metadata
about the parent and creates a backing chain element from those. This
removes the duplication of the first element.

To avoid breaking the test suite, virstoragetest now calls a wrapper
that creates the parent structure explicitly and pre-fills it with the
test data with same function signature as previously used.

Don't remove detected metadata about directory based storage volumes.

Switch over to storing of the backing chain as a recursive
virStorageSource structure.

This is a string based move. Currently the first element will be present
twice in the backing chain as currently the retrieval function stores
the parent in the newly detected chain. This will be fixed later.

To conform with the naming of the planned XML output rename the metadata
variable name.

s/backingMeta/backingStore/g

Remove the now unused pieces of the structure.

Replace the old structure with the new one. This change is a trivial
name change operation (along with change of the freeing function).

Add the required fields that are missing from the new structure that
will allow us to switch the storage file metadata code entirely to the
new structure.

Add "relPath" and "relDir" and the raw backing store name. Also allow
creating linked lists of virStorageSourcePtrs to express backing chains.

Add a free function as some parts of the code will allocate the
structure.

Remove the obsolete field replaced by data in "path".

The testsuite requires tweaking as the name of the backing file is now
stored one layer deeper in the backing chain linked list.

As a temporary step to allow killing of the "backingStore" field of
struct virStorageFileMetadata the recursive metadata retrieval function
will be converted not to use the field in the lookup process.