66 lines
2.5 KiB
Python
66 lines
2.5 KiB
Python
#
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# Snapshot device
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#
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# Copyright (C) 2019 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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from blivet.devices import LVMLogicalVolumeDevice
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from blivet.errors import StorageError
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from pyanaconda.anaconda_loggers import get_module_logger
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from pyanaconda.core.i18n import _
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log = get_module_logger(__name__)
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__all__ = ["get_snapshot_device"]
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def get_snapshot_device(request, devicetree):
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"""Get the ThinLV snapshot device.
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:param request: a snapshot request
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:param devicetree: a device tree to look up devices
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:return: a model of the ThinLV snapshot
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"""
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snap_name = request.name.replace('-', '--')
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origin = request.origin.replace('-', '--').replace('/', '-')
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origin_dev = devicetree.get_device_by_name(origin)
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log.debug("Snapshot: name %s has origin %s", request.name, origin_dev)
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if origin_dev is None:
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raise StorageError(
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_("Snapshot: origin \"{}\" doesn't exist!").format(request.origin)
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)
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if not origin_dev.is_thin_lv:
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raise StorageError(
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_("Snapshot: origin \"{}\" of snapshot \"{}\" is not a valid "
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"thin LV device.").format(request.origin, request.name)
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)
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if devicetree.get_device_by_name("%s-%s" % (origin_dev.vg.name, snap_name)):
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raise StorageError(
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_("Snapshot {} already exists.").format(request.name)
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)
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try:
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return LVMLogicalVolumeDevice(
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name=request.name,
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parents=[origin_dev.pool],
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seg_type="thin",
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origin=origin_dev
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)
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except ValueError as e:
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raise StorageError(str(e)) from e
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