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59 lines
2.3 KiB
Python
59 lines
2.3 KiB
Python
from abstract import AbstractPartitionMap
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from ..partitions.msdos import MSDOSPartition
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from ..partitions.msdos_swap import MSDOSSwapPartition
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from ....common.tools import log_check_call
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class MSDOSPartitionMap(AbstractPartitionMap):
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"""Represents a MS-DOS partition map
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Sometimes also called MBR (but that confuses the hell out of me, so ms-dos it is)
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"""
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def __init__(self, data, bootloader):
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"""
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Args:
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data (dict): volume.partitions part of the manifest
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bootloader (str): Name of the bootloader we will use for bootstrapping
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"""
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from ....common.bytes import Bytes
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# List of partitions
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self.partitions = []
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# Returns the last partition unless there is none
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def last_partition():
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return self.partitions[-1] if len(self.partitions) > 0 else None
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# The boot and swap partitions are optional
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if 'boot' in data:
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self.boot = MSDOSPartition(Bytes(data['boot']['size']),
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data['boot']['filesystem'], data['boot'].get('format_command', None),
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last_partition())
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self.partitions.append(self.boot)
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if 'swap' in data:
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self.swap = MSDOSSwapPartition(Bytes(data['swap']['size']), last_partition())
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self.partitions.append(self.swap)
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self.root = MSDOSPartition(Bytes(data['root']['size']),
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data['root']['filesystem'], data['root'].get('format_command', None),
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last_partition())
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self.partitions.append(self.root)
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# Mark boot as the boot partition, or root, if boot does not exist
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getattr(self, 'boot', self.root).flags.append('boot')
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# If we are using the grub bootloader, we will need to create a 2 MB offset at the beginning
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# of the partitionmap and steal it from the first partition
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if bootloader == 'grub':
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self.partitions[0].offset = Bytes('2MiB')
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self.partitions[0].size -= self.partitions[0].offset
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super(MSDOSPartitionMap, self).__init__(bootloader)
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def _before_create(self, event):
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volume = event.volume
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# Disk alignment still plays a role in virtualized environment,
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# but I honestly have no clue as to what best practice is here, so we choose 'none'
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log_check_call(['parted', '--script', '--align', 'none', volume.device_path,
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'--', 'mklabel', 'msdos'])
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# Create the partitions
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for partition in self.partitions:
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partition.create(volume)
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