def instance_for_format(image, mountdir, partition):
"""Get a Mount instance for the image type
:param image: instance of nova.virt.image.model.Image
:param mountdir: path to mount the image at
:param partition: partition number to mount
"""
LOG.debug(
"Instance for format image=%(image)s "
"mountdir=%(mountdir)s partition=%(partition)s", {
'image': image,
'mountdir': mountdir,
'partition': partition
})
if isinstance(image, imgmodel.LocalFileImage):
if image.format == imgmodel.FORMAT_RAW:
LOG.debug("Using LoopMount")
return importutils.import_object(
"nova.virt.disk.mount.loop.LoopMount", image, mountdir,
partition)
else:
LOG.debug("Using NbdMount")
return importutils.import_object(
"nova.virt.disk.mount.nbd.NbdMount", image, mountdir,
partition)
elif isinstance(image, imgmodel.LocalBlockImage):
LOG.debug("Using BlockMount")
return importutils.import_object(
"nova.virt.disk.mount.block.BlockMount", image, mountdir,
partition)
else:
# TODO(berrange) We could mount RBDImage directly
# using kernel RBD block dev support.
#
# This is left as an enhancement for future
# motivated developers todo, since raising
# an exception is on par with what this
# code did historically
raise exception.UnsupportedImageModel(image.__class__.__name__)
def setup(self, mount=True):
LOG.debug("Setting up appliance for %(image)s",
{'image': self.image})
try:
self.handle = tpool.Proxy(
guestfs.GuestFS(python_return_dict=False,
close_on_exit=False))
except TypeError as e:
if 'close_on_exit' in str(e) or 'python_return_dict' in str(e):
# NOTE(russellb) In case we're not using a version of
# libguestfs new enough to support parameters close_on_exit
# and python_return_dict which were added in libguestfs 1.20.
self.handle = tpool.Proxy(guestfs.GuestFS())
else:
raise
if CONF.guestfs.debug:
self.configure_debug()
try:
if forceTCG:
# TODO(mriedem): Should we be using set_backend_setting
# instead to just set the single force_tcg setting? Because
# according to the guestfs docs, set_backend_settings will
# overwrite all backend settings. The question is, what would
# the value be? True? "set_backend_setting" is available
# starting in 1.27.2 which should be new enough at this point
# on modern distributions.
ret = self.handle.set_backend_settings(["force_tcg"])
if ret != 0:
LOG.warning('Failed to force guestfs TCG mode. '
'guestfs_set_backend_settings returned: %s',
ret)
except AttributeError as ex:
# set_backend_settings method doesn't exist in older
# libguestfs versions, so nothing we can do but ignore
LOG.warning("Unable to force TCG mode, "
"libguestfs too old? %s", ex)
pass
try:
if isinstance(self.image, imgmodel.LocalImage):
self.handle.add_drive_opts(self.image.path,
format=self.image.format)
elif isinstance(self.image, imgmodel.RBDImage):
self.handle.add_drive_opts("%s/%s" % (self.image.pool,
self.image.name),
protocol="rbd",
format=imgmodel.FORMAT_RAW,
server=self.image.servers,
username=self.image.user,
secret=self.image.password)
else:
raise exception.UnsupportedImageModel(
self.image.__class__.__name__)
self.handle.launch()
if mount:
self.setup_os()
self.handle.aug_init("/", 0)
self.mount = True
except RuntimeError as e:
# explicitly teardown instead of implicit close()
# to prevent orphaned VMs in cases when an implicit
# close() is not enough
self.teardown()
raise exception.NovaException(
_("Error mounting %(image)s with libguestfs (%(e)s)") %
{'image': self.image, 'e': e})
except Exception:
# explicitly teardown instead of implicit close()
# to prevent orphaned VMs in cases when an implicit
# close() is not enough
self.teardown()
raise
def setup(self, mount=True):
LOG.debug("Setting up appliance for %(image)s", {'image': self.image})
try:
self.handle = tpool.Proxy(
guestfs.GuestFS(python_return_dict=False, close_on_exit=False))
except TypeError as e:
if ('close_on_exit' in six.text_type(e)
or 'python_return_dict' in six.text_type(e)):
# NOTE(russellb) In case we're not using a version of
# libguestfs new enough to support parameters close_on_exit
# and python_return_dict which were added in libguestfs 1.20.
self.handle = tpool.Proxy(guestfs.GuestFS())
else:
raise
if CONF.guestfs.debug:
self.configure_debug()
try:
if forceTCG:
self.handle.set_backend_settings("force_tcg")
except AttributeError as ex:
# set_backend_settings method doesn't exist in older
# libguestfs versions, so nothing we can do but ignore
LOG.warning("Unable to force TCG mode, "
"libguestfs too old? %s", ex)
pass
try:
if isinstance(self.image, imgmodel.LocalImage):
self.handle.add_drive_opts(self.image.path,
format=self.image.format)
elif isinstance(self.image, imgmodel.RBDImage):
self.handle.add_drive_opts("%s/%s" %
(self.image.pool, self.image.name),
protocol="rbd",
format=imgmodel.FORMAT_RAW,
server=self.image.servers,
username=self.image.user,
secret=self.image.password)
else:
raise exception.UnsupportedImageModel(
self.image.__class__.__name__)
self.handle.launch()
if mount:
self.setup_os()
self.handle.aug_init("/", 0)
self.mount = True
except RuntimeError as e:
# explicitly teardown instead of implicit close()
# to prevent orphaned VMs in cases when an implicit
# close() is not enough
self.teardown()
raise exception.NovaException(
_("Error mounting %(image)s with libguestfs (%(e)s)") % {
'image': self.image,
'e': e
})
except Exception:
# explicitly teardown instead of implicit close()
# to prevent orphaned VMs in cases when an implicit
# close() is not enough
self.teardown()
raise