43 lines
1.3 KiB
Python
43 lines
1.3 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 Red Hat, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Support for mounting images with the loop device"""
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from nova import utils
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from nova.virt.disk.mount import api
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class LoopMount(api.Mount):
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"""loop back support for raw images."""
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mode = 'loop'
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device_id_string = mode
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def get_dev(self):
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out, err = utils.trycmd('losetup', '--find', '--show', self.image,
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run_as_root=True)
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if err:
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self.error = _('Could not attach image to loopback: %s') % err
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return False
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self.device = out.strip()
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self.linked = True
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return True
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def unget_dev(self):
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if not self.linked:
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return
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utils.execute('losetup', '--detach', self.device, run_as_root=True)
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self.linked = False
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