1d1e4ccb3e
Currently we pass a reference to a global "rollback" list to create() to keep rollback functions. Other nodes don't need to know about global rollback state, and by passing by reference we're giving them the chance to mess it up for everyone else. Add a "add_rollback()" function in NodeBase for create() calls to register rollback calls within themselves. As they hit rollback points they can add a new entry. lambda v arguments is much of a muchness -- but this is similar to the standard atexit() call so with go with that pattern. A new "rollback()" call is added that the driver will invoke on each node as it works its way backwards in case of failure. On error, nodes will have rollback() called in reverse order (which then calls registered rollbacks in reverse order). A unit test is added to test rollback behaviour Change-Id: I65214e72c7ef607dd08f750a6d32a0b10fe97ac3
70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
# 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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from diskimage_builder.block_device.exception import \
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BlockDeviceSetupException
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from diskimage_builder.block_device.plugin import NodeBase
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logger = logging.getLogger(__name__)
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class PartitionNode(NodeBase):
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flag_boot = 1
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flag_primary = 2
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def __init__(self, config, state, parent, prev_partition):
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super(PartitionNode, self).__init__(config['name'], state)
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self.base = config['base']
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self.partitioning = parent
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self.prev_partition = prev_partition
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self.flags = set()
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if 'flags' in config:
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for f in config['flags']:
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if f == 'boot':
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self.flags.add(self.flag_boot)
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elif f == 'primary':
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self.flags.add(self.flag_primary)
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else:
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raise BlockDeviceSetupException("Unknown flag: %s" % f)
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if 'size' not in config:
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raise BlockDeviceSetupException("No size in partition" % self.name)
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self.size = config['size']
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self.ptype = int(config['type'], 16) if 'type' in config else 0x83
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def get_flags(self):
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return self.flags
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def get_size(self):
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return self.size
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def get_type(self):
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return self.ptype
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def get_edges(self):
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edge_from = [self.base]
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edge_to = []
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if self.prev_partition is not None:
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edge_from.append(self.prev_partition.name)
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return (edge_from, edge_to)
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def create(self):
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self.partitioning.create()
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