120 lines
4.1 KiB
Python
120 lines
4.1 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.level0 import Level0
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from diskimage_builder.block_device.utils import convert_to_utf8
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import json
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import logging
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import os
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import shutil
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logger = logging.getLogger(__name__)
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class BlockDevice(object):
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# Currently there is only the need for a first element (which must
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# be a list).
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DefaultConfig = [
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[["local_loop",
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{"name": "rootdisk"}]]]
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# The reason for the complex layout is, that for future layers
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# there is a need to add additional lists, like:
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# DefaultConfig = [
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# [["local_loop",
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# {"name": "rootdisk"}]],
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# [["partitioning",
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# {"rootdisk": {
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# "label": "mbr",
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# "partitions":
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# [{"name": "rd-partition1",
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# "flags": ["boot"],
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# "size": "100%"}]}}]],
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# [["fs",
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# {"rd-partition1": {}}]]
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# ]
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def __init__(self, block_device_config, build_dir,
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default_image_size, default_image_dir):
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if block_device_config is None:
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self.config = BlockDevice.DefaultConfig
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else:
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self.config = json.loads(block_device_config)
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self.default_config = {
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'image_size': default_image_size,
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'image_dir': default_image_dir}
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self.state_dir = os.path.join(build_dir,
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"states/block-device")
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self.state_json_file_name \
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= os.path.join(self.state_dir, "state.json")
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def write_state(self, result):
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logger.debug("Write state [%s]" % self.state_json_file_name)
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os.makedirs(self.state_dir)
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with open(self.state_json_file_name, "w") as fd:
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json.dump([self.config, self.default_config, result], fd)
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def load_state(self):
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with open(self.state_json_file_name, "r") as fd:
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return convert_to_utf8(json.load(fd))
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def cmd_create(self):
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"""Creates the block device"""
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logger.info("create() called")
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logger.debug("config [%s]" % self.config)
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lvl0 = Level0(self.config[0], self.default_config, None)
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result = lvl0.create()
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logger.debug("Result level 0 [%s]" % result)
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# To be compatible with the current implementation, echo the
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# result to stdout.
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print("%s" % result['rootdisk']['device'])
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self.write_state(result)
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logger.info("create() finished")
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return 0
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def cmd_umount(self):
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"""Unmounts the blockdevice and cleanup resources"""
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logger.info("umount() called")
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try:
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os.stat(self.state_json_file_name)
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except OSError:
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logger.info("State already cleaned - no way to do anything here")
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return 0
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config, default_config, state = self.load_state()
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logger.debug("Using config [%s]" % config)
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logger.debug("Using default config [%s]" % default_config)
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logger.debug("Using state [%s]" % state)
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level0 = Level0(config[0], default_config, state)
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result = level0.delete()
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# If everything finished well, remove the results.
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if result:
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logger.info("Removing temporary dir [%s]" % self.state_dir)
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shutil.rmtree(self.state_dir)
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# To be compatible with the current implementation, echo the
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# result to stdout.
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print("%s" % state['rootdisk']['image'])
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logger.info("umount() finished result [%d]" % result)
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return 0 if result else 1
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