75817ef205
This switches the code to use networkx for the digraph implementation. Note that the old implementation specifically isn't removed in this change -- for review clarity. It will be replaced by a base class that defines things properly to the API described below. Plugins return a node object with three functions get_name() : return the unique name of this node get_nodes() : return a list of nodes for insertion into the graph. Usually this is just "self". Some special things like partitioning add extra nodes at this point, however. get_edges() : return a tuple of two lists; edges_from and edges_to As you would expect the first is a list of node names that points to us, and the second is a list of node names we point to. Usually this is only populated as ([self.base],[]) -- i.e. our "base" node points to us. Some plugins, such as mounting, create links both to and from themselves, however. Plugins have been updated, some test cases added (error cases specifically) Change-Id: Ic5a61365ef0132476b11bdbf1dd96885e91c3cb6
134 lines
4.8 KiB
Python
134 lines
4.8 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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import logging
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import os
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import subprocess
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from diskimage_builder.block_device.exception import \
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BlockDeviceSetupException
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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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logger = logging.getLogger(__name__)
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class LocalLoop(Digraph.Node):
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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 get_edges(self):
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"""Because this is created without base, there are no edges."""
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return ([], [])
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def get_nodes(self):
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"""Returns nodes for adding to the graph"""
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return [self]
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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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if 'blockdev' not in result:
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result['blockdev'] = {}
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result['blockdev'][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['blockdev'][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['blockdev'][self.name]['image'])
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