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def load_volume(data, bootloader):
"""Instantiates a volume that corresponds to the data in the manifest
:param dict data: The 'volume' section from the manifest
:param str bootloader: Name of the bootloader the system will boot with
:return: The volume that represents all information pertaining to the volume we bootstrap on.
:rtype: Volume
"""
# Map valid partition maps in the manifest and their corresponding classes
from partitionmaps.gpt import GPTPartitionMap
from partitionmaps.msdos import MSDOSPartitionMap
from partitionmaps.none import NoPartitions
partition_map = {'none': NoPartitions,
'gpt': GPTPartitionMap,
'msdos': MSDOSPartitionMap,
}.get(data['partitions']['type'])
# Map valid volume backings in the manifest and their corresponding classes
from bootstrapvz.common.fs.loopbackvolume import LoopbackVolume
from bootstrapvz.providers.ec2.ebsvolume import EBSVolume
from bootstrapvz.common.fs.virtualdiskimage import VirtualDiskImage
from bootstrapvz.common.fs.virtualharddisk import VirtualHardDisk
from bootstrapvz.common.fs.virtualmachinedisk import VirtualMachineDisk
from bootstrapvz.common.fs.folder import Folder
from bootstrapvz.common.fs.logicalvolume import LogicalVolume
from bootstrapvz.common.fs.qcow2volume import Qcow2Volume
volume_backing = {'raw': LoopbackVolume,
's3': LoopbackVolume,
'vdi': VirtualDiskImage,
'vhd': VirtualHardDisk,
'vmdk': VirtualMachineDisk,
'ebs': EBSVolume,
'folder': Folder,
'lvm': LogicalVolume,
'qcow2': Qcow2Volume
}.get(data['backing'])
# Instantiate the partition map
from bootstrapvz.common.bytes import Bytes
# Only operate with a physical sector size of 512 bytes for now,
# not sure if we can change that for some of the virtual disks
sector_size = Bytes('512B')
partition_map = partition_map(data['partitions'], sector_size, bootloader)
# Create the volume with the partition map as an argument
return volume_backing(partition_map)
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