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Make the gpt_offset fiddling easier to understand

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This commit is contained in:
Anders Ingemann 2014-05-04 11:18:54 +02:00
parent f3d633780f
commit a9558a729a
1 changed files with 9 additions and 9 deletions
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18
bootstrapvz/base/fs/partitionmaps/gpt.py
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@ -22,16 +22,12 @@ class GPTPartitionMap(AbstractPartitionMap):
def last_partition():
return self.partitions[-1] if len(self.partitions) > 0 else None
# GPT offset
gpt_offset = Bytes('17KiB')
# If we are using the grub bootloader we need to create an unformatted partition
# at the beginning of the map. Its size is 1007kb, which we will steal from the
# next partition.
if bootloader == 'grub':
from ..partitions.unformatted import UnformattedPartition
self.grub_boot = UnformattedPartition(Bytes('1007KiB'), last_partition())
self.grub_boot.offset = gpt_offset
# Mark the partition as a bios_grub partition
self.grub_boot.flags.append('bios_grub')
self.partitions.append(self.grub_boot)
@ -50,13 +46,17 @@ class GPTPartitionMap(AbstractPartitionMap):
'root', last_partition())
self.partitions.append(self.root)
# Depending on whether we have a grub boot partition
# we will need to set the offset accordingly.
# We need to move the first partition to make space for the gpt offset
gpt_offset = Bytes('17KiB')
self.partitions[0].offset = gpt_offset
if hasattr(self, 'grub_boot'):
self.partitions[1].size -= gpt_offset
self.partitions[1].size -= self.grub_boot.size
# grub_boot should not increase the size of the volume,
# so we reduce the size of the succeeding partition.
# gpt_offset is included here, because of the offset we added above
self.partitions[1].size -= self.grub_boot.get_end()
else:
self.partitions[0].offset = gpt_offset
# Avoid increasing the volume size because of gpt_offset
self.partitions[0].size -= gpt_offset
super(GPTPartitionMap, self).__init__(bootloader)