803d40b0c6
The original approach was to pass each and every command line parameter to the block device. While the block device functionality gets extended, this is not any longer practical. Instead of passing in all the parameters separately this patch collects these in a YAML file that is passed in to the block device layer. Change-Id: I9d07593a01441b62632234468ac25a982cf1a9f0 Signed-off-by: Andreas Florath <andreas@florath.net>
128 lines
4.7 KiB
Python
128 lines
4.7 KiB
Python
# Copyright 2016 Andreas Florath (andreas@florath.net)
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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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from diskimage_builder.block_device.blockdevicesetupexception \
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import BlockDeviceSetupException
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from diskimage_builder.block_device.plugin_base import NodePluginBase
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from diskimage_builder.block_device.utils import parse_abs_size_spec
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from diskimage_builder.graph.digraph import Digraph
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import logging
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import os
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import subprocess
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logger = logging.getLogger(__name__)
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class LocalLoop(NodePluginBase):
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"""Level0: Local loop image device handling.
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This class handles local loop devices that can be used
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for VM image installation.
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"""
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def __init__(self, config, default_config):
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logger.debug("Creating LocalLoop object; config [%s] "
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"default_config [%s]" % (config, default_config))
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if 'size' in config:
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self.size = parse_abs_size_spec(config['size'])
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logger.debug("Image size [%s]" % self.size)
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else:
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self.size = parse_abs_size_spec(default_config['image-size'])
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logger.debug("Using default image size [%s]" % self.size)
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if 'directory' in config:
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self.image_dir = config['directory']
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else:
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self.image_dir = default_config['image-dir']
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self.name = config['name']
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Digraph.Node.__init__(self, self.name)
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self.filename = os.path.join(self.image_dir, self.name + ".raw")
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def insert_edges(self, dg):
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"""Because this is created without base, there are no edges."""
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pass
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@staticmethod
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def image_create(filename, size):
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logger.info("Create image file [%s]" % filename)
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with open(filename, "w") as fd:
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fd.seek(size - 1)
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fd.write("\0")
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@staticmethod
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def _image_delete(filename):
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logger.info("Remove image file [%s]" % filename)
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os.remove(filename)
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@staticmethod
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def _loopdev_attach(filename):
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logger.info("loopdev attach")
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logger.debug("Calling [sudo losetup --show -f %s]", filename)
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subp = subprocess.Popen(["sudo", "losetup", "--show", "-f",
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filename], stdout=subprocess.PIPE)
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rval = subp.wait()
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if rval == 0:
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# [:-1]: Cut of the newline
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block_device = subp.stdout.read()[:-1].decode("utf-8")
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logger.info("New block device [%s]" % block_device)
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return block_device
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else:
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logger.error("losetup failed")
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raise BlockDeviceSetupException("losetup failed")
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@staticmethod
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def _loopdev_detach(loopdev):
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logger.info("loopdev detach")
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# loopback dev may be tied up a bit by udev events triggered
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# by partition events
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for try_cnt in range(10, 1, -1):
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logger.debug("Calling [sudo losetup -d %s]", loopdev)
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subp = subprocess.Popen(["sudo", "losetup", "-d",
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loopdev])
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rval = subp.wait()
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if rval == 0:
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logger.info("Successfully detached [%s]" % loopdev)
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return 0
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else:
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logger.error("loopdev detach failed")
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# Do not raise an error - maybe other cleanup methods
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# can at least do some more work.
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logger.debug("Gave up trying to detach [%s]" % loopdev)
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return rval
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def create(self, result, rollback):
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logger.debug("[%s] Creating loop on [%s] with size [%d]" %
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(self.name, self.filename, self.size))
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rollback.append(lambda: self._image_delete(self.filename))
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self.image_create(self.filename, self.size)
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block_device = self._loopdev_attach(self.filename)
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rollback.append(lambda: self._loopdev_detach(block_device))
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result[self.name] = {"device": block_device,
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"image": self.filename}
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logger.debug("Created loop name [%s] device [%s] image [%s]"
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% (self.name, block_device, self.filename))
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return
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def umount(self, state):
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self._loopdev_detach(state[self.name]['device'])
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def cleanup(self, state):
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pass
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def delete(self, state):
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self._image_delete(state[self.name]['image'])
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