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https://github.com/kevingruesser/bootstrap-vz.git
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74 lines
2.9 KiB
Python
74 lines
2.9 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 bootstrapvz.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, sector_size, bootloader):
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"""
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:param dict data: volume.partitions part of the manifest
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:param int sector_size: Sectorsize of the volume
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:param str bootloader: Name of the bootloader we will use for bootstrapping
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"""
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from bootstrapvz.common.sectors import Sectors
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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(Sectors(data['boot']['size'], sector_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(Sectors(data['swap']['size'], sector_size), last_partition())
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self.partitions.append(self.swap)
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self.root = MSDOSPartition(Sectors(data['root']['size'], sector_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 add a 2 MB offset
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# at the beginning of the partitionmap and steal it from the first partition.
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# The MBR offset is included in the grub offset, so if we don't use grub
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# we should reduce the size of the first partition and move it by only 512 bytes.
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if bootloader == 'grub':
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mbr_offset = Sectors('2MiB', sector_size)
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else:
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mbr_offset = Sectors('512B', sector_size)
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self.partitions[0].pad_start += mbr_offset
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self.partitions[0].size -= mbr_offset
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# Leave the last sector unformatted
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# parted in jessie thinks that a partition 10 sectors in size
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# goes from sector 0 to sector 9 (instead of 0 to 10)
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self.partitions[-1].pad_end += 1
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self.partitions[-1].size -= 1
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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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