# # Helper functions for determining if libvirt supports certain features # # Copyright 2009, 2013, 2014 Red Hat, Inc. # Cole Robinson # # This work is licensed under the GNU GPLv2 or later. # See the COPYING file in the top-level directory. import libvirt from . import util # Check that command is present in the python bindings, and return the # the requested function def _get_command(funcname, objname=None, obj=None): if not obj: obj = libvirt if objname: if not hasattr(libvirt, objname): return None obj = getattr(libvirt, objname) if not hasattr(obj, funcname): return None return getattr(obj, funcname) # Make sure libvirt object 'objname' has function 'funcname' def _has_command(funcname, objname=None, obj=None): return bool(_get_command(funcname, objname, obj)) # Make sure libvirt object has flag 'flag_name' def _get_flag(flag_name): return _get_command(flag_name) # Try to call the passed function, and look for signs that libvirt or driver # doesn't support it def _try_command(func, run_args, check_all_error=False): try: func(*run_args) except libvirt.libvirtError as e: if util.is_error_nosupport(e): return False if check_all_error: return False except Exception as e: # Other python exceptions likely mean the bindings are horked return False return True # Return the hypervisor version def _split_function_name(function): if not function: return (None, None) output = function.split(".") if len(output) == 1: return (None, output[0]) else: return (output[0], output[1]) def _check_function(function, flag, run_args, data): object_name, function_name = _split_function_name(function) if not function_name: return None # Make sure function is present in either libvirt module or # object_name class flag_tuple = () if not _has_command(function_name, objname=object_name): return False if flag: found_flag = _get_flag(flag) if not bool(found_flag): return False flag_tuple = (found_flag,) if run_args is None: return None # If function requires an object, make sure the passed obj # is of the correct type if object_name: classobj = _get_command(object_name) if not isinstance(data, classobj): raise ValueError( "Passed obj %s with args must be of type %s, was %s" % (data, str(classobj), type(data))) cmd = _get_command(function_name, obj=data) # Function with args specified is all the proof we need return _try_command(cmd, run_args + flag_tuple, check_all_error=bool(flag_tuple)) def _version_str_to_int(verstr): if verstr is None: return None if verstr == 0: return 0 if verstr.count(".") != 2: raise RuntimeError("programming error: version string '%s' needs " "two '.' in it.") return ((int(verstr.split(".")[0]) * 1000000) + (int(verstr.split(".")[1]) * 1000) + (int(verstr.split(".")[2]))) class _SupportCheck(object): """ @version: Minimum libvirt version required for this feature. Not used if 'args' provided. @function: Function name to check exists. If object not specified, function is checked against libvirt module. If run_args is specified, this function will actually be called, so beware. @run_args: Argument tuple to actually test 'function' with, and check for an 'unsupported' error from libvirt. @flag: A flag to check exists. This will be appended to the argument list if run_args are provided, otherwise we will only check against that the flag is present in the python bindings. @hv_version: A dictionary with hypervisor names for keys, and hypervisor versions as values. This is for saying 'this feature is only supported with qemu version 1.5.0' or similar. If the version is 0, then perform no version check. @hv_libvirt_version: Similar to hv_version, but this will check the version of libvirt for a specific hv key. Use this to say 'this feature is supported with qemu and libvirt version 1.0.0, and xen with libvirt version 1.1.0' """ def __init__(self, function=None, run_args=None, flag=None, version=None, hv_version=None, hv_libvirt_version=None): self.function = function self.run_args = run_args self.flag = flag self.version = version self.hv_version = hv_version or {} self.hv_libvirt_version = hv_libvirt_version or {} versions = ([self.version] + list(self.hv_libvirt_version.values())) for vstr in versions: v = _version_str_to_int(vstr) if vstr is not None and v != 0 and v < 7009: raise RuntimeError("programming error: Cannot enforce " "support checks for libvirt versions less than 0.7.9, " "since required APIs were not available. ver=%s" % vstr) def check_support(self, conn, data): ret = _check_function(self.function, self.flag, self.run_args, data) if ret is not None: return ret # Do this after the function check, since there's an ordering issue # with VirtinstConnection hv_type = conn.get_uri_driver() actual_libvirt_version = conn.daemon_version() actual_hv_version = conn.conn_version() # Check that local libvirt version is sufficient v = _version_str_to_int(self.version) if v and (v > actual_libvirt_version): return False if self.hv_version: if hv_type not in self.hv_version: if "all" not in self.hv_version: return False elif (actual_hv_version < _version_str_to_int(self.hv_version[hv_type])): return False if self.hv_libvirt_version: if hv_type not in self.hv_libvirt_version: if "all" not in self.hv_libvirt_version: return False elif (actual_libvirt_version < _version_str_to_int(self.hv_libvirt_version[hv_type])): return False return True _support_id = 0 _support_objs = [] def _make(*args, **kwargs): global _support_id _support_id += 1 obj = _SupportCheck(*args, **kwargs) _support_objs.append(obj) return _support_id SUPPORT_CONN_STORAGE = _make( function="virConnect.listStoragePools", run_args=()) SUPPORT_CONN_NODEDEV = _make( function="virConnect.listDevices", run_args=(None, 0)) SUPPORT_CONN_NETWORK = _make(function="virConnect.listNetworks", run_args=()) SUPPORT_CONN_INTERFACE = _make( function="virConnect.listInterfaces", run_args=()) SUPPORT_CONN_STREAM = _make(function="virConnect.newStream", run_args=(0,)) SUPPORT_CONN_LISTALLDOMAINS = _make( function="virConnect.listAllDomains", run_args=()) SUPPORT_CONN_LISTALLNETWORKS = _make( function="virConnect.listAllNetworks", run_args=()) SUPPORT_CONN_LISTALLSTORAGEPOOLS = _make( function="virConnect.listAllStoragePools", run_args=()) SUPPORT_CONN_LISTALLINTERFACES = _make( function="virConnect.listAllInterfaces", run_args=()) SUPPORT_CONN_LISTALLDEVICES = _make( function="virConnect.listAllDevices", run_args=()) SUPPORT_CONN_WORKING_XEN_EVENTS = _make(hv_version={"xen": "4.0.0", "all": 0}) # This is an arbitrary check to say whether it's a good idea to # default to qcow2. It might be fine for xen or qemu older than the versions # here, but until someone tests things I'm going to be a bit conservative. SUPPORT_CONN_DEFAULT_QCOW2 = _make(hv_version={"qemu": "1.2.0", "test": 0}) SUPPORT_CONN_DEFAULT_USB2 = _make(hv_version={"qemu": "1.0.0", "test": 0}) SUPPORT_CONN_AUTOSOCKET = _make(hv_libvirt_version={"qemu": "1.0.6"}) SUPPORT_CONN_PM_DISABLE = _make(hv_version={"qemu": "1.2.0", "test": 0}) SUPPORT_CONN_QCOW2_LAZY_REFCOUNTS = _make( version="1.1.0", hv_version={"qemu": "1.2.0", "test": 0}) SUPPORT_CONN_CPU_MODEL_NAMES = _make(function="virConnect.getCPUModelNames", run_args=("x86_64", 0)) SUPPORT_CONN_HYPERV_VAPIC = _make( version="1.1.0", hv_version={"qemu": "1.1.0", "test": 0}) SUPPORT_CONN_HYPERV_CLOCK = _make( version="1.2.2", hv_version={"qemu": "2.0.0", "test": 0}) SUPPORT_CONN_HYPERV_CLOCK_RHEL = _make( version="1.2.2", hv_version={"qemu": "1.5.3", "test": 0}) SUPPORT_CONN_DOMAIN_CAPABILITIES = _make( function="virConnect.getDomainCapabilities", run_args=(None, None, None, None)) SUPPORT_CONN_DOMAIN_RESET = _make(version="0.9.7", hv_version={"qemu": 0}) SUPPORT_CONN_VMPORT = _make( version="1.2.16", hv_version={"qemu": "2.2.0", "test": 0}) SUPPORT_CONN_MEM_STATS_PERIOD = _make( function="virDomain.setMemoryStatsPeriod", version="1.1.1", hv_version={"qemu": 0}) # spice GL is actually enabled with libvirt 1.3.3, but 3.1.0 is the # first version that sorts out the qemu:///system + cgroup issues SUPPORT_CONN_SPICE_GL = _make(version="3.1.0", hv_version={"qemu": "2.6.0", "test": 0}) SUPPORT_CONN_SPICE_RENDERNODE = _make(version="3.1.0", hv_version={"qemu": "2.9.0", "test": 0}) SUPPORT_CONN_VIDEO_VIRTIO_ACCEL3D = _make(version="1.3.0", hv_version={"qemu": "2.5.0", "test": 0}) SUPPORT_CONN_GRAPHICS_LISTEN_NONE = _make(version="2.0.0") SUPPORT_CONN_RNG_URANDOM = _make(version="1.3.4") SUPPORT_CONN_USB3_PORTS = _make(version="1.3.5") SUPPORT_CONN_MACHVIRT_PCI_DEFAULT = _make(version="3.0.0") SUPPORT_CONN_QEMU_XHCI = _make(version="3.3.0") SUPPORT_CONN_VNC_NONE_AUTH = _make(hv_version={"qemu": "2.9.0"}) # This is for disk . xen supports this, but it's # limited to arbitrary new enough xen, since I know libxl can handle it # but I don't think the old xend driver does. SUPPORT_CONN_DISK_DRIVER_NAME_QEMU = _make( hv_version={"qemu": 0, "xen": "4.2.0"}, hv_libvirt_version={"qemu": 0, "xen": "1.1.0"}) ################# # Domain checks # ################# SUPPORT_DOMAIN_XML_INACTIVE = _make(function="virDomain.XMLDesc", run_args=(), flag="VIR_DOMAIN_XML_INACTIVE") SUPPORT_DOMAIN_XML_SECURE = _make(function="virDomain.XMLDesc", run_args=(), flag="VIR_DOMAIN_XML_SECURE") SUPPORT_DOMAIN_MANAGED_SAVE = _make( function="virDomain.hasManagedSaveImage", run_args=(0,)) SUPPORT_DOMAIN_JOB_INFO = _make(function="virDomain.jobInfo", run_args=()) SUPPORT_DOMAIN_LIST_SNAPSHOTS = _make( function="virDomain.listAllSnapshots", run_args=()) SUPPORT_DOMAIN_MEMORY_STATS = _make( function="virDomain.memoryStats", run_args=()) SUPPORT_DOMAIN_STATE = _make(function="virDomain.state", run_args=()) SUPPORT_DOMAIN_OPEN_GRAPHICS = _make(function="virDomain.openGraphicsFD", version="1.2.8", hv_version={"qemu": 0}) ############### # Pool checks # ############### SUPPORT_POOL_ISACTIVE = _make(function="virStoragePool.isActive", run_args=()) SUPPORT_POOL_LISTALLVOLUMES = _make( function="virStoragePool.listAllVolumes", run_args=()) SUPPORT_POOL_METADATA_PREALLOC = _make( flag="VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA", version="1.0.1") #################### # Interface checks # #################### SUPPORT_INTERFACE_XML_INACTIVE = _make(function="virInterface.XMLDesc", flag="VIR_INTERFACE_XML_INACTIVE", run_args=()) SUPPORT_INTERFACE_ISACTIVE = _make( function="virInterface.isActive", run_args=()) ################## # Network checks # ################## SUPPORT_NET_ISACTIVE = _make(function="virNetwork.isActive", run_args=()) def check_support(virtconn, feature, data=None): """ Attempt to determine if a specific libvirt feature is support given the passed connection. :param virtconn: Libvirt connection to check feature on :param feature: Feature type to check support for :type feature: One of the SUPPORT_* flags :param data: Option libvirt object to use in feature checking :type data: Could be virDomain, virNetwork, virStoragePool, hv name, etc :returns: True if feature is supported, False otherwise """ if "VirtinstConnection" in repr(data): data = data.get_conn_for_api_arg() sobj = _support_objs[feature - 1] return sobj.check_support(virtconn, data) def check_version(virtconn, version): """ Check libvirt version. Useful for the test suite so we don't need to keep adding new support checks. """ sobj = _SupportCheck(version=version) return sobj.check_support(virtconn, None)