744 lines
24 KiB
Python
744 lines
24 KiB
Python
#
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# Copyright 2008, 2013, 2015 Red Hat, Inc.
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#
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# This work is licensed under the GNU GPLv2 or later.
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# See the COPYING file in the top-level directory.
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import os
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import threading
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import libvirt
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from . import generatename
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from . import progress
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from .logger import log
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from .xmlbuilder import XMLBuilder, XMLChildProperty, XMLProperty
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_DEFAULT_DEV_TARGET = "/dev"
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_DEFAULT_SCSI_TARGET = "/dev/disk/by-path"
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_DEFAULT_MPATH_TARGET = "/dev/mapper"
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class _StoragePermissions(XMLBuilder):
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XML_NAME = "permissions"
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_XML_PROP_ORDER = ["mode", "owner", "group", "label"]
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mode = XMLProperty("./mode")
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owner = XMLProperty("./owner")
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group = XMLProperty("./group")
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label = XMLProperty("./label")
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class _StorageObject(XMLBuilder):
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"""
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Base class for building any libvirt storage object.
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Meaningless to directly instantiate.
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"""
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##############
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# Properties #
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##############
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name = XMLProperty("./name")
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permissions = XMLChildProperty(_StoragePermissions,
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relative_xpath="./target",
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is_single=True)
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def _preferred_default_pool_path(conn):
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path = "/var/lib/libvirt/images"
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if conn.is_unprivileged():
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path = os.path.expanduser("~/.local/share/libvirt/images")
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return path
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def _lookup_poolxml_by_path(conn, path):
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for poolxml in conn.fetch_all_pools():
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xml_path = poolxml.target_path
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if xml_path is not None and os.path.abspath(xml_path) == path:
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return poolxml
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return None
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class _Host(XMLBuilder):
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_XML_PROP_ORDER = ["name", "port"]
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XML_NAME = "host"
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name = XMLProperty("./@name")
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port = XMLProperty("./@port", is_int=True)
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class StoragePool(_StorageObject):
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"""
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Base class for building and installing libvirt storage pool xml
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"""
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TYPE_DIR = "dir"
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TYPE_FS = "fs"
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TYPE_NETFS = "netfs"
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TYPE_LOGICAL = "logical"
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TYPE_DISK = "disk"
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TYPE_ISCSI = "iscsi"
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TYPE_SCSI = "scsi"
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TYPE_MPATH = "mpath"
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TYPE_GLUSTER = "gluster"
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TYPE_RBD = "rbd"
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TYPE_SHEEPDOG = "sheepdog"
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TYPE_ZFS = "zfs"
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@staticmethod
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def pool_list_from_sources(conn, pool_type):
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"""
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Return a list of StoragePool instances built from libvirt's pool
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source enumeration (if supported).
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:param conn: Libvirt connection
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:param pool_type: Pool type string from I{Types}
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"""
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source_xml = "<source/>"
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try:
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xml = conn.findStoragePoolSources(pool_type, source_xml, 0)
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except Exception as e: # pragma: no cover
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if conn.support.is_error_nosupport(e):
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return []
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raise
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log.debug("Libvirt returned pool sources XML:\n%s", xml)
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import xml.etree.ElementTree as ET
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root = ET.fromstring(xml)
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# We implicitly only support this for pool TYPE_LOGICAL
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ret = [e.text for e in root.findall("./source/name")]
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log.debug("Sources returning: %s", ret)
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return ret
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@staticmethod
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def lookup_default_pool(conn):
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"""
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Helper to lookup the default pool. It will return one of
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* The pool named 'default'
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* If that doesn't exist, the pool pointing to the default path
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* Otherwise None
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"""
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name = "default"
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path = _preferred_default_pool_path(conn)
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poolxml = None
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for trypool in conn.fetch_all_pools():
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if trypool.name == name:
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poolxml = trypool
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break
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else:
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poolxml = _lookup_poolxml_by_path(conn, path)
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if poolxml:
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log.debug("Found default pool name=%s target=%s",
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poolxml.name, poolxml.target_path)
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return poolxml
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@staticmethod
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def build_default_pool(conn):
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"""
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Attempt to lookup the 'default' pool, but if it doesn't exist,
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create it
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"""
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poolxml = StoragePool.lookup_default_pool(conn)
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if poolxml:
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return poolxml
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try:
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name = "default"
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path = _preferred_default_pool_path(conn)
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log.debug("Attempting to build default pool with target '%s'",
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path)
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defpool = StoragePool(conn)
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defpool.type = defpool.TYPE_DIR
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defpool.name = name
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defpool.target_path = path
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defpool.install(build=True, create=True, autostart=True)
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return defpool
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except Exception as e: # pragma: no cover
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raise RuntimeError(
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_("Couldn't create default storage pool '%(path)s': %(error)s") % {
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"path": path,
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"error": str(e),
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})
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@staticmethod
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def lookup_pool_by_path(conn, path):
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"""
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Return the first pool with matching matching target path.
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return the first we find, active or inactive. This iterates over
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all pools and dumps their xml, so it is NOT quick.
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:returns: virStoragePool object if found, None otherwise
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"""
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poolxml = _lookup_poolxml_by_path(conn, path)
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if not poolxml:
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return None
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return conn.storagePoolLookupByName(poolxml.name)
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@staticmethod
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def find_free_name(conn, basename, **kwargs):
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"""
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Finds a name similar (or equal) to passed 'basename' that is not
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in use by another pool. Extra params are passed to generate_name
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"""
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def cb(name):
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for pool in conn.fetch_all_pools():
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if pool.name == name:
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return True
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return False
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return generatename.generate_name(basename, cb, **kwargs)
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@staticmethod
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def ensure_pool_is_running(pool_object, refresh=False):
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"""
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If the passed vmmStoragePool isn't running, start it.
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:param pool_object: vmmStoragePool to check/start
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:param refresh: If True, run refresh() as well
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"""
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if pool_object.info()[0] != libvirt.VIR_STORAGE_POOL_RUNNING:
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log.debug("starting pool=%s", pool_object.name())
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pool_object.create(0)
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if refresh:
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log.debug("refreshing pool=%s", pool_object.name())
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pool_object.refresh(0)
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######################
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# Validation helpers #
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######################
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@staticmethod
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def validate_name(conn, name):
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XMLBuilder.validate_generic_name(_("Storage object"), name)
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try:
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conn.storagePoolLookupByName(name)
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except libvirt.libvirtError:
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return
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raise ValueError(_("Name '%s' already in use by another pool." %
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name)) # pragma: no cover
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def default_target_path(self):
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if not self.supports_target_path():
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return None
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if (self.type == self.TYPE_DIR or
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self.type == self.TYPE_NETFS or
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self.type == self.TYPE_FS):
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return os.path.join(
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_preferred_default_pool_path(self.conn), self.name)
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if self.type == self.TYPE_ISCSI or self.type == self.TYPE_SCSI:
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return _DEFAULT_SCSI_TARGET
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if self.type == self.TYPE_MPATH:
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return _DEFAULT_MPATH_TARGET
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def _type_to_source_prop(self):
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if (self.type == self.TYPE_NETFS or
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self.type == self.TYPE_GLUSTER):
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return "_source_dir"
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elif self.type == self.TYPE_SCSI:
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return "_source_adapter"
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else:
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return "_source_device"
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def _get_source(self):
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return getattr(self, self._type_to_source_prop())
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def _set_source(self, val):
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return setattr(self, self._type_to_source_prop(), val)
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source_path = property(_get_source, _set_source)
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def default_source_name(self):
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if not self.supports_source_name():
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return None
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if self.type == StoragePool.TYPE_RBD:
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return "rbd"
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if self.type == StoragePool.TYPE_GLUSTER:
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return "gv0"
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##############
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# Properties #
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##############
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XML_NAME = "pool"
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_XML_PROP_ORDER = ["name", "type", "uuid",
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"capacity", "allocation", "available",
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"format", "hosts",
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"_source_dir", "_source_adapter", "_source_device",
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"source_name", "target_path",
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"permissions",
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"auth_type", "auth_username", "auth_secret_uuid"]
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_source_dir = XMLProperty("./source/dir/@path")
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_source_adapter = XMLProperty("./source/adapter/@name")
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_source_device = XMLProperty("./source/device/@path")
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type = XMLProperty("./@type")
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uuid = XMLProperty("./uuid")
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capacity = XMLProperty("./capacity", is_int=True)
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allocation = XMLProperty("./allocation", is_int=True)
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available = XMLProperty("./available", is_int=True)
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format = XMLProperty("./source/format/@type")
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iqn = XMLProperty("./source/initiator/iqn/@name")
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source_name = XMLProperty("./source/name")
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auth_type = XMLProperty("./source/auth/@type")
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auth_username = XMLProperty("./source/auth/@username")
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auth_secret_uuid = XMLProperty("./source/auth/secret/@uuid")
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target_path = XMLProperty("./target/path")
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hosts = XMLChildProperty(_Host, relative_xpath="./source")
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######################
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# Public API helpers #
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######################
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def supports_target_path(self):
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return self.type in [
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self.TYPE_DIR, self.TYPE_FS, self.TYPE_NETFS,
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self.TYPE_ISCSI,
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self.TYPE_SCSI, self.TYPE_MPATH]
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def supports_source_name(self):
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return self.type in [self.TYPE_LOGICAL, self.TYPE_GLUSTER,
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self.TYPE_RBD, self.TYPE_SHEEPDOG, self.TYPE_ZFS]
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def supports_source_path(self):
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return self.type in [
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self.TYPE_FS, self.TYPE_NETFS,
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self.TYPE_DISK, self.TYPE_ISCSI, self.TYPE_SCSI,
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self.TYPE_GLUSTER]
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def supports_hosts(self):
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return self.type in [
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self.TYPE_NETFS, self.TYPE_ISCSI, self.TYPE_GLUSTER,
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self.TYPE_RBD, self.TYPE_SHEEPDOG]
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def supports_format(self):
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return self.type in [self.TYPE_FS, self.TYPE_NETFS, self.TYPE_DISK]
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def supports_iqn(self):
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return self.type in [self.TYPE_ISCSI]
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def get_disk_type(self):
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if (self.type == StoragePool.TYPE_DISK or
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self.type == StoragePool.TYPE_LOGICAL or
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self.type == StoragePool.TYPE_SCSI or
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self.type == StoragePool.TYPE_MPATH or
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self.type == StoragePool.TYPE_ZFS):
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return StorageVolume.TYPE_BLOCK
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if (self.type == StoragePool.TYPE_GLUSTER or
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self.type == StoragePool.TYPE_RBD or
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self.type == StoragePool.TYPE_ISCSI or
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self.type == StoragePool.TYPE_SHEEPDOG):
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return StorageVolume.TYPE_NETWORK
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return StorageVolume.TYPE_FILE
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##################
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# Build routines #
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##################
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def validate(self):
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self.validate_name(self.conn, self.name)
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if not self.target_path:
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if self.type == self.TYPE_DISK:
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# disk is a bit special, in that it demands a target path,
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# but basically can't handle anything other than /dev
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self.target_path = _DEFAULT_DEV_TARGET
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else:
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self.target_path = self.default_target_path()
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if not self.source_name:
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self.source_name = self.default_source_name()
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if not self.format and self.supports_format():
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self.format = "auto"
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if (self.type == self.TYPE_DISK and self.format == "auto"):
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# There is no explicit "auto" type for disk pools, but leaving out
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# the format type seems to do the job for existing formatted disks
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self.format = None
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def install(self, meter=None, create=False, build=False, autostart=False):
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"""
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Install storage pool xml.
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"""
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xml = self.get_xml()
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log.debug("Creating storage pool '%s' with xml:\n%s",
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self.name, xml)
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meter = progress.ensure_meter(meter)
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try:
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pool = self.conn.storagePoolDefineXML(xml, 0)
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except Exception as e: # pragma: no cover
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raise RuntimeError(_("Could not define storage pool: %s") % str(e))
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errmsg = None
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if build:
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try:
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pool.build(libvirt.VIR_STORAGE_POOL_BUILD_NEW)
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except Exception as e: # pragma: no cover
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errmsg = _("Could not build storage pool: %s") % str(e)
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if create and not errmsg:
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try:
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pool.create(0)
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except Exception as e: # pragma: no cover
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errmsg = _("Could not start storage pool: %s") % str(e)
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if autostart and not errmsg:
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try:
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pool.setAutostart(True)
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except Exception as e: # pragma: no cover
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errmsg = _("Could not set pool autostart flag: %s") % str(e)
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if errmsg: # pragma: no cover
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# Try and clean up the leftover pool
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try:
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pool.undefine()
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except Exception as e:
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log.debug("Error cleaning up pool after failure: %s",
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str(e))
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raise RuntimeError(errmsg)
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self.conn.cache_new_pool(pool)
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return pool
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def _progress_thread(volname, pool, meter, event):
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vol = None
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if not meter:
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return # pragma: no cover
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while True:
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try:
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if not vol:
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vol = pool.storageVolLookupByName(volname)
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vol.info() # pragma: no cover
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break # pragma: no cover
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except Exception:
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if event.wait(.2):
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break
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if vol is None:
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log.debug("Couldn't lookup storage volume in prog thread.")
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return
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while True: # pragma: no cover
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dummy1, dummy2, alloc = vol.info()
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meter.update(alloc)
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if event.wait(1):
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break
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class StorageVolume(_StorageObject):
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"""
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Base class for building and installing libvirt storage volume xml
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"""
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@staticmethod
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def get_file_extension_for_format(fmt):
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if not fmt:
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return ""
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if fmt == "raw":
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return ".img"
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return "." + fmt
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@staticmethod
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def find_free_name(conn, pool_object, basename, collideguest=None, **kwargs):
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"""
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Finds a name similar (or equal) to passed 'basename' that is not
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in use by another volume. Extra params are passed to generate_name
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:param collideguest: Guest object. If specified, also check to
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ensure we don't collide with any disk paths there
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"""
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collidelist = []
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if collideguest:
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pooltarget = None
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poolname = pool_object.name()
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for poolxml in conn.fetch_all_pools():
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if poolxml.name == poolname:
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pooltarget = poolxml.target_path
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break
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for disk in collideguest.devices.disk:
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if (pooltarget and disk.path and
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os.path.dirname(disk.path) == pooltarget):
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collidelist.append(os.path.basename(disk.path))
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def cb(tryname):
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if tryname in collidelist:
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return True
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return generatename.check_libvirt_collision(
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pool_object.storageVolLookupByName, tryname)
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StoragePool.ensure_pool_is_running(pool_object, refresh=True)
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return generatename.generate_name(basename, cb, **kwargs)
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TYPE_FILE = getattr(libvirt, "VIR_STORAGE_VOL_FILE", 0)
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TYPE_BLOCK = getattr(libvirt, "VIR_STORAGE_VOL_BLOCK", 1)
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TYPE_DIR = getattr(libvirt, "VIR_STORAGE_VOL_DIR", 2)
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TYPE_NETWORK = getattr(libvirt, "VIR_STORAGE_VOL_NETWORK", 3)
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TYPE_NETDIR = getattr(libvirt, "VIR_STORAGE_VOL_NETDIR", 4)
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def __init__(self, *args, **kwargs):
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_StorageObject.__init__(self, *args, **kwargs)
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self._input_vol = None
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self._pool = None
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self._pool_xml = None
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self._reflink = False
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######################
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# Non XML properties #
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######################
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def _get_pool(self):
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return self._pool
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def _set_pool(self, newpool):
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StoragePool.ensure_pool_is_running(newpool)
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self._pool = newpool
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self._pool_xml = StoragePool(self.conn,
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parsexml=self._pool.XMLDesc(0))
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pool = property(_get_pool, _set_pool)
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@property
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def input_vol(self):
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return self._input_vol
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def set_input_vol(self, vol):
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self._input_vol = vol
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parsevol = StorageVolume(self.conn,
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parsexml=self._input_vol.XMLDesc(0))
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self.format = parsevol.format
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self.capacity = parsevol.capacity
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self.allocation = parsevol.allocation
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if not self._pool:
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self.pool = self._input_vol.storagePoolLookupByVolume()
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def _get_reflink(self):
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return self._reflink
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def _set_reflink(self, reflink):
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self._reflink = reflink
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reflink = property(_get_reflink, _set_reflink)
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##########################
|
|
# XML validation helpers #
|
|
##########################
|
|
|
|
@staticmethod
|
|
def validate_name(pool, name):
|
|
XMLBuilder.validate_generic_name(_("Storage object"), name)
|
|
|
|
try:
|
|
pool.storageVolLookupByName(name)
|
|
except libvirt.libvirtError:
|
|
return
|
|
raise ValueError(_("Name '%s' already in use by another volume." %
|
|
name)) # pragma: no cover
|
|
|
|
def _get_vol_type(self):
|
|
if self.type: # pragma: no cover
|
|
if self.type == "file":
|
|
return self.TYPE_FILE
|
|
elif self.type == "block":
|
|
return self.TYPE_BLOCK
|
|
elif self.type == "dir":
|
|
return self.TYPE_DIR
|
|
elif self.type == "network":
|
|
return self.TYPE_NETWORK
|
|
return self._pool_xml.get_disk_type()
|
|
file_type = property(_get_vol_type)
|
|
|
|
|
|
##################
|
|
# XML properties #
|
|
##################
|
|
|
|
XML_NAME = "volume"
|
|
_XML_PROP_ORDER = ["name", "key", "capacity", "allocation", "format",
|
|
"target_path", "permissions"]
|
|
|
|
type = XMLProperty("./@type")
|
|
key = XMLProperty("./key")
|
|
capacity = XMLProperty("./capacity", is_int=True)
|
|
allocation = XMLProperty("./allocation", is_int=True)
|
|
format = XMLProperty("./target/format/@type")
|
|
target_path = XMLProperty("./target/path")
|
|
backing_store = XMLProperty("./backingStore/path")
|
|
backing_format = XMLProperty("./backingStore/format/@type")
|
|
lazy_refcounts = XMLProperty(
|
|
"./target/features/lazy_refcounts", is_bool=True)
|
|
|
|
|
|
def _detect_backing_store_format(self):
|
|
log.debug("Attempting to detect format for backing_store=%s",
|
|
self.backing_store)
|
|
from . import diskbackend
|
|
vol, pool = diskbackend.manage_path(self.conn, self.backing_store)
|
|
|
|
if not vol: # pragma: no cover
|
|
log.debug("Didn't find any volume for backing_store")
|
|
return None
|
|
|
|
# Only set backing format for volumes that support
|
|
# the 'format' parameter as we know it, like qcow2 etc.
|
|
volxml = StorageVolume(self.conn, vol.XMLDesc(0))
|
|
volxml.pool = pool
|
|
log.debug("Found backing store volume XML:\n%s",
|
|
volxml.get_xml())
|
|
|
|
if not volxml.supports_format(): # pragma: no cover
|
|
log.debug("backing_store volume doesn't appear to have "
|
|
"a file format we can specify, returning None")
|
|
return None
|
|
|
|
log.debug("Returning format=%s", volxml.format)
|
|
return volxml.format
|
|
|
|
|
|
######################
|
|
# Public API helpers #
|
|
######################
|
|
|
|
def supports_format(self):
|
|
if self.file_type == self.TYPE_FILE:
|
|
return True
|
|
if self._pool_xml.type == StoragePool.TYPE_GLUSTER:
|
|
return True
|
|
return False
|
|
|
|
|
|
##################
|
|
# Build routines #
|
|
##################
|
|
|
|
def validate(self):
|
|
self.validate_name(self.pool, self.name)
|
|
|
|
if not self.format and self.file_type == self.TYPE_FILE:
|
|
self.format = "raw"
|
|
if self._prop_is_unset("lazy_refcounts") and self.format == "qcow2":
|
|
self.lazy_refcounts = self.conn.support.conn_qcow2_lazy_refcounts()
|
|
|
|
if self._pool_xml.type == StoragePool.TYPE_LOGICAL:
|
|
if self.allocation != self.capacity:
|
|
log.warning(_("Sparse logical volumes are not supported, "
|
|
"setting allocation equal to capacity"))
|
|
self.allocation = self.capacity
|
|
|
|
isfatal, errmsg = self.is_size_conflict()
|
|
if isfatal:
|
|
raise ValueError(errmsg)
|
|
if errmsg:
|
|
log.warning(errmsg)
|
|
|
|
def install(self, meter=None):
|
|
"""
|
|
Build and install storage volume from xml
|
|
"""
|
|
if self.backing_store and not self.backing_format:
|
|
self.backing_format = self._detect_backing_store_format()
|
|
|
|
xml = self.get_xml()
|
|
log.debug("Creating storage volume '%s' with xml:\n%s",
|
|
self.name, xml)
|
|
|
|
cloneflags = 0
|
|
createflags = 0
|
|
if (self.format == "qcow2" and
|
|
not self.backing_store and
|
|
self.conn.support.pool_metadata_prealloc(self.pool)):
|
|
createflags |= libvirt.VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA
|
|
if self.capacity == self.allocation:
|
|
# For cloning, this flag will make libvirt+qemu-img preallocate
|
|
# the new disk image
|
|
cloneflags |= libvirt.VIR_STORAGE_VOL_CREATE_PREALLOC_METADATA
|
|
|
|
if self.reflink:
|
|
cloneflags |= getattr(libvirt,
|
|
"VIR_STORAGE_VOL_CREATE_REFLINK", 1)
|
|
|
|
event = threading.Event()
|
|
meter = progress.ensure_meter(meter)
|
|
t = threading.Thread(target=_progress_thread,
|
|
name="Checking storage allocation",
|
|
args=(self.name, self.pool, meter, event))
|
|
t.setDaemon(True)
|
|
|
|
try:
|
|
t.start()
|
|
meter.start(size=self.capacity,
|
|
text=_("Allocating '%s'") % self.name)
|
|
|
|
if self.conn.is_really_test():
|
|
# Test suite doesn't support any flags, so reset them
|
|
createflags = 0
|
|
cloneflags = 0
|
|
|
|
if self.input_vol:
|
|
vol = self.pool.createXMLFrom(xml, self.input_vol, cloneflags)
|
|
else:
|
|
log.debug("Using vol create flags=%s", createflags)
|
|
vol = self.pool.createXML(xml, createflags)
|
|
|
|
meter.end(self.capacity)
|
|
log.debug("Storage volume '%s' install complete.", self.name)
|
|
return vol
|
|
except Exception as e:
|
|
log.debug("Error creating storage volume", exc_info=True)
|
|
raise RuntimeError("Couldn't create storage volume "
|
|
"'%s': '%s'" % (self.name, str(e)))
|
|
finally:
|
|
event.set()
|
|
t.join()
|
|
|
|
def is_size_conflict(self):
|
|
"""
|
|
Report if requested size exceeds its pool's available amount
|
|
|
|
:returns: 2 element tuple:
|
|
1. True if collision is fatal, false otherwise
|
|
2. String message if some collision was encountered.
|
|
"""
|
|
if not self.pool:
|
|
return (False, "")
|
|
|
|
# pool info is [pool state, capacity, allocation, available]
|
|
avail = self.pool.info()[3]
|
|
if self.allocation > avail:
|
|
msg = (_("There is not enough free space on the storage "
|
|
"pool to create the volume. (%(mem1)s M requested "
|
|
"allocation > %(mem2)s M available)") %
|
|
{"mem1": (self.allocation // (1024 * 1024)),
|
|
"mem2": (avail // (1024 * 1024))})
|
|
return (True, msg)
|
|
elif self.capacity > avail:
|
|
msg = (_("The requested volume capacity will exceed the "
|
|
"available pool space when the volume is fully "
|
|
"allocated. (%(mem1)s M requested "
|
|
"capacity > %(mem2)s M available)") %
|
|
{"mem1": (self.capacity // (1024 * 1024)),
|
|
"mem2": (avail // (1024 * 1024))})
|
|
return (False, msg)
|
|
return (False, "")
|