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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.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, 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 bootstrapvz.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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# 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 we will steal from the
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# next partition.
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if bootloader == 'grub':
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from ..partitions.unformatted import UnformattedPartition
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self.grub_boot = UnformattedPartition(Bytes('1007KiB'), last_partition())
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# Mark the partition as a bios_grub partition
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self.grub_boot.flags.append('bios_grub')
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self.partitions.append(self.grub_boot)
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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(Bytes(data['boot']['size']),
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data['boot']['filesystem'], data['boot'].get('format_command', None),
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'boot', 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 = GPTSwapPartition(Bytes(data['swap']['size']), last_partition())
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self.partitions.append(self.swap)
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self.root = GPTPartition(Bytes(data['root']['size']),
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data['root']['filesystem'], data['root'].get('format_command', None),
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'root', last_partition())
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self.partitions.append(self.root)
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# We need to move the first partition to make space for the gpt offset
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gpt_offset = Bytes('17KiB')
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self.partitions[0].offset = gpt_offset
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if hasattr(self, 'grub_boot'):
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# grub_boot should not increase the size of the volume,
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# so we reduce the size of the succeeding partition.
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# gpt_offset is included here, because of the offset we added above
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self.partitions[1].size -= self.grub_boot.get_end()
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else:
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# Avoid increasing the volume size because of gpt_offset
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self.partitions[0].size -= gpt_offset
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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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