96504a4de0
The order of the partitions is important, it needs to be preserved. If using a simple dict, this is not happening. As a consequence, checks like 'primary partition being first' are failing because the dictionary sorts the partitions randomly. Switched to OrderedDict solved the problem, as it preserves the ordering it gets from the yaml blob. Change-Id: Icfa9bd95ffd0203d7c3f6af95de3a6f848c2a954
237 lines
8.8 KiB
Python
237 lines
8.8 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 collections
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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.level1.mbr import MBR
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from diskimage_builder.block_device.utils import parse_abs_size_spec
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from diskimage_builder.block_device.utils import parse_rel_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 Partition(Digraph.Node):
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def __init__(self, name, flags, size, ptype, base, partitioning):
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Digraph.Node.__init__(self, name)
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self.flags = flags
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self.size = size
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self.ptype = ptype
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self.base = base
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self.partitioning = partitioning
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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 insert_edges(self, dg):
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bnode = dg.find(self.base)
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assert bnode is not None
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dg.create_edge(bnode, self)
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def create(self, result, rollback):
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self.partitioning.create(result, rollback)
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def umount(self, state):
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"""Partitioning does not need any umount task."""
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pass
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def cleanup(self, state):
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"""Partitioning does not need any cleanup."""
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pass
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def delete(self, state):
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"""Partitioning does not need any cleanup."""
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pass
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class Partitioning(object):
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type_string = "partitioning"
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flag_boot = 1
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flag_primary = 2
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def __init__(self, config, default_config):
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logger.debug("Creating Partitioning object; config [%s]" % config)
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# Because using multiple partitions of one base is done
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# within one object, there is the need to store a flag if the
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# creation of the partitions was already done.
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self.already_created = False
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# Parameter check
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if 'base' not in config:
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self._config_error("Partitioning config needs 'base'")
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self.base = config['base']
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if 'label' not in config:
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self._config_error("Partitioning config needs 'label'")
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self.label = config['label']
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if self.label not in ("mbr", ):
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self._config_error("Label must be 'mbr'")
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# It is VERY important to get the alignment correct. If this
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# is not correct, the disk performance might be very poor.
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# Example: In some tests a 'off by one' leads to a write
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# performance of 30% compared to a correctly aligned
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# partition.
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# The problem for DIB is, that it cannot assume that the host
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# system uses the same IO sizes as the target system,
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# therefore here a fixed approach (as used in all modern
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# systems with large disks) is used. The partitions are
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# aligned to 1MiB (which are about 2048 times 512 bytes
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# blocks)
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self.align = 1024 * 1024 # 1MiB as default
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if 'align' in config:
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self.align = parse_abs_size_spec(config['align'])
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if 'partitions' not in config:
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self._config_error("Partitioning config needs 'partitions'")
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self.partitions = collections.OrderedDict()
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for part_cfg in config['partitions']:
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if 'name' not in part_cfg:
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self.config_error("Missing 'name' in partition config")
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part_name = part_cfg['name']
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flags = set()
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if 'flags' in part_cfg:
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for f in part_cfg['flags']:
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if f == 'boot':
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flags.add(Partitioning.flag_boot)
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elif f == 'primary':
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flags.add(Partitioning.flag_primary)
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else:
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self._config_error("Unknown flag [%s] in "
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"partitioning for [%s]"
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% (f, part_name))
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if 'size' not in part_cfg:
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self._config_error("No 'size' in partition [%s]"
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% part_name)
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size = part_cfg['size']
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ptype = int(part_cfg['type'], 16) if 'type' in part_cfg else 0x83
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self.partitions[part_name] \
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= Partition(part_name, flags, size, ptype, self.base, self)
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logger.debug(part_cfg)
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def _config_error(self, msg):
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logger.error(msg)
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raise BlockDeviceSetupException(msg)
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def _size_of_block_dev(self, dev):
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with open(dev, "r") as fd:
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fd.seek(0, 2)
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return fd.tell()
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def insert_nodes(self, dg):
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for _, part in self.partitions.items():
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dg.add_node(part)
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def _exec_sudo(self, cmd):
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sudo_cmd = ["sudo"]
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sudo_cmd.extend(cmd)
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logger.info("Calling [%s]" % " ".join(sudo_cmd))
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subp = subprocess.Popen(sudo_cmd)
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rval = subp.wait()
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if rval != 0:
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logger.error("Calling [%s] failed with [%s]" %
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(" ".join(sudo_cmd), rval))
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logger.error("Trying to continue")
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def _all_part_devices_exist(self, expected_part_devices):
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for part_device in expected_part_devices:
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logger.debug("Checking if partition device [%s] exists" %
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part_device)
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if not os.path.exists(part_device):
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logger.info("Partition device [%s] does not exists"
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% part_device)
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return False
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logger.debug("Partition already exists [%s]" % part_device)
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return True
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def _notify_os_of_partition_changes(self, device_path, partition_devices):
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"""Notify of of partition table changes
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There is the need to call some programs to inform the operating
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system of partition tables changes.
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These calls are highly distribution and version specific. Here
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a couple of different methods are used to get the best result.
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"""
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self._exec_sudo(["partprobe", device_path])
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self._exec_sudo(["udevadm", "settle"])
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if self._all_part_devices_exist(partition_devices):
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return
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# If running inside Docker, make our nodes manually, because udev
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# will not be working.
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if os.path.exists("/.dockerenv"):
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# kpartx cannot run in sync mode in docker.
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self._exec_sudo(["kpartx", "-av", device_path])
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self._exec_sudo(["dmsetup", "--noudevsync", "mknodes"])
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return
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self._exec_sudo(["kpartx", "-avs", device_path])
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def create(self, result, rollback):
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image_path = result[self.base]['image']
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device_path = result[self.base]['device']
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logger.info("Creating partition on [%s] [%s]" %
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(self.base, image_path))
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if self.already_created:
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logger.info("Not creating the partitions a second time.")
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return
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assert self.label == 'mbr'
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partition_devices = set()
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disk_size = self._size_of_block_dev(image_path)
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with MBR(image_path, disk_size, self.align) as part_impl:
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for part_name, part_cfg in self.partitions.items():
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part_bootflag = Partitioning.flag_boot \
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in part_cfg.get_flags()
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part_primary = Partitioning.flag_primary \
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in part_cfg.get_flags()
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part_size = part_cfg.get_size()
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part_free = part_impl.free()
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part_type = part_cfg.get_type()
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logger.debug("Not partitioned space [%d]" % part_free)
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part_size = parse_rel_size_spec(part_size,
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part_free)[1]
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part_no \
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= part_impl.add_partition(part_primary, part_bootflag,
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part_size, part_type)
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logger.debug("Create partition [%s] [%d]" %
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(part_name, part_no))
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partition_device_name = device_path + "p%d" % part_no
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result[part_name] = {'device': partition_device_name}
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partition_devices.add(partition_device_name)
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self.already_created = True
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self._notify_os_of_partition_changes(device_path, partition_devices)
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return
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