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107 lines
5 KiB
Python
107 lines
5 KiB
Python
from abstract import AbstractPartitionMap
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from ..partitions.gpt import GPTPartition
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from ..partitions.gpt_swap import GPTSwapPartition
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from bootstrapvz.common.tools import log_check_call
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class GPTPartitionMap(AbstractPartitionMap):
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"""Represents a GPT partition map
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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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if bootloader == 'grub':
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# If we are using the grub bootloader we need to create an unformatted partition
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# at the beginning of the map. Its size is 1007kb, which seems to be chosen so that
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# primary gpt + grub = 1024KiB
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# The 1 MiB will be subtracted later on, once we know what the subsequent partition is
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from ..partitions.unformatted import UnformattedPartition
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self.grub_boot = UnformattedPartition(Sectors('1MiB', sector_size), last_partition())
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self.partitions.append(self.grub_boot)
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# Offset all partitions by 1 sector.
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# parted in jessie has changed and no longer allows
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# partitions to be right next to each other.
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partition_gap = Sectors(1, sector_size)
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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 = GPTPartition(Sectors(data['boot']['size'], sector_size),
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data['boot']['filesystem'], data['boot'].get('format_command', None),
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data['boot'].get('mountopts', None), 'boot', last_partition())
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if self.boot.previous is not None:
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# No need to pad if this is the first partition
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self.boot.pad_start += partition_gap
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self.boot.size -= partition_gap
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self.partitions.append(self.boot)
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if 'swap' in data:
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self.swap = GPTSwapPartition(Sectors(data['swap']['size'], sector_size), last_partition())
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if self.swap.previous is not None:
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self.swap.pad_start += partition_gap
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self.swap.size -= partition_gap
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self.partitions.append(self.swap)
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self.root = GPTPartition(Sectors(data['root']['size'], sector_size),
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data['root']['filesystem'], data['root'].get('format_command', None),
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data['root'].get('mountopts', None), 'root', last_partition())
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if self.root.previous is not None:
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self.root.pad_start += partition_gap
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self.root.size -= partition_gap
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self.partitions.append(self.root)
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# Create all additional partitions
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for partition in data:
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if partition not in ["boot", "swap", "root", "type"] and not None:
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part_tmp = GPTPartition(Sectors(data[partition]['size'], sector_size),
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data[partition]['filesystem'], data[partition].get('format_command', None),
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data[partition].get('mountopts', None), partition, last_partition())
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part_tmp.pad_start += partition_gap
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part_tmp.size -= partition_gap
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setattr(self, partition, part_tmp)
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self.partitions.append(part_tmp)
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if hasattr(self, 'grub_boot'):
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# Mark the grub partition as a bios_grub partition
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self.grub_boot.flags.append('bios_grub')
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# Subtract the grub partition size from the subsequent partition
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self.partitions[1].size -= self.grub_boot.size
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else:
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# Not using grub, mark the boot partition or root as bootable
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getattr(self, 'boot', self.root).flags.append('legacy_boot')
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# The first and last 34 sectors are reserved for the primary/secondary GPT
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primary_gpt_size = Sectors(34, sector_size)
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self.partitions[0].pad_start += primary_gpt_size
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self.partitions[0].size -= primary_gpt_size
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secondary_gpt_size = Sectors(34, sector_size)
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self.partitions[-1].pad_end += secondary_gpt_size
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self.partitions[-1].size -= secondary_gpt_size
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super(GPTPartitionMap, self).__init__(bootloader)
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def _before_create(self, event):
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"""Creates the partition map
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"""
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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', 'gpt'])
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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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