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98 lines
3.5 KiB
Python
98 lines
3.5 KiB
Python
from abstract import AbstractPartition
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from bootstrapvz.common.sectors import Sectors
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class BasePartition(AbstractPartition):
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"""Represents a partition that is actually a partition (and not a virtual one like 'Single')
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"""
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# Override the states of the abstract partition
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# A real partition can be mapped and unmapped
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events = [{'name': 'create', 'src': 'nonexistent', 'dst': 'unmapped'},
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{'name': 'map', 'src': 'unmapped', 'dst': 'mapped'},
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{'name': 'format', 'src': 'mapped', 'dst': 'formatted'},
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{'name': 'mount', 'src': 'formatted', 'dst': 'mounted'},
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{'name': 'unmount', 'src': 'mounted', 'dst': 'formatted'},
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{'name': 'unmap', 'src': 'formatted', 'dst': 'unmapped_fmt'},
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{'name': 'map', 'src': 'unmapped_fmt', 'dst': 'formatted'},
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{'name': 'unmap', 'src': 'mapped', 'dst': 'unmapped'},
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]
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def __init__(self, size, filesystem, format_command, previous):
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"""
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:param Bytes size: Size of the partition
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:param str filesystem: Filesystem the partition should be formatted with
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:param list format_command: Optional format command, valid variables are fs, device_path and size
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:param BasePartition previous: The partition that preceeds this one
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"""
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# By saving the previous partition we have a linked list
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# that partitions can go backwards in to find the first partition.
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self.previous = previous
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# List of flags that parted should put on the partition
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self.flags = []
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super(BasePartition, self).__init__(size, filesystem, format_command)
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def create(self, volume):
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"""Creates the partition
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:param Volume volume: The volume to create the partition on
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"""
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self.fsm.create(volume=volume)
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def get_index(self):
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"""Gets the index of this partition in the partition map
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:return: The index of the partition in the partition map
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:rtype: int
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"""
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if self.previous is None:
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# Partitions are 1 indexed
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return 1
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else:
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# Recursive call to the previous partition, walking up the chain...
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return self.previous.get_index() + 1
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def get_start(self):
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"""Gets the starting byte of this partition
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:return: The starting byte of this partition
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:rtype: Sectors
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"""
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if self.previous is None:
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return Sectors(0, self.size.sector_size)
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else:
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return self.previous.get_end()
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def map(self, device_path):
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"""Maps the partition to a device_path
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:param str device_path: The device patht his partition should be mapped to
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"""
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self.fsm.map(device_path=device_path)
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def _before_create(self, e):
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"""Creates the partition
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"""
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from bootstrapvz.common.tools import log_check_call
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# The create command is failry simple, start and end are just Bytes objects coerced into strings
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create_command = ('mkpart primary {start} {end}'
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.format(start=str(self.get_start() + self.pad_start),
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end=str(self.get_end() - self.pad_end)))
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# Create the partition
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log_check_call(['parted', '--script', '--align', 'none', e.volume.device_path,
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'--', create_command])
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# Set any flags on the partition
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for flag in self.flags:
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log_check_call(['parted', '--script', e.volume.device_path,
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'--', ('set {idx} {flag} on'
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.format(idx=str(self.get_index()), flag=flag))])
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def _before_map(self, e):
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# Set the device path
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self.device_path = e.device_path
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def _before_unmap(self, e):
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# When unmapped, the device_path ifnromation becomes invalid, so we delete it
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self.device_path = None
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