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511a44f72e
Enables the use of Logical Volumes as disk backends. It uses an existing volume group and has no support for creating a new one. It will not override an existing logical volume and fail gracefully. The lv is created, activated and then mounted as a loop device. The boostraping process is then launched on the loop device. Once the process is completed, the lv is unmounted and desactivated. The created lv will be deleted should the boostraping process fail. The lv must be activated before use. A manifest has been included for testing purposes.
47 lines
2.1 KiB
Python
47 lines
2.1 KiB
Python
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def load_volume(data, bootloader):
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"""Instantiates a volume that corresponds to the data in the manifest
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:param dict data: The 'volume' section from the manifest
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:param str bootloader: Name of the bootloader the system will boot with
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:return: The volume that represents all information pertaining to the volume we bootstrap on.
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:rtype: Volume
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"""
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# Map valid partition maps in the manifest and their corresponding classes
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from partitionmaps.gpt import GPTPartitionMap
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from partitionmaps.msdos import MSDOSPartitionMap
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from partitionmaps.none import NoPartitions
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partition_map = {'none': NoPartitions,
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'gpt': GPTPartitionMap,
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'msdos': MSDOSPartitionMap,
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}.get(data['partitions']['type'])
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# Map valid volume backings in the manifest and their corresponding classes
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from bootstrapvz.common.fs.loopbackvolume import LoopbackVolume
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from bootstrapvz.providers.ec2.ebsvolume import EBSVolume
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from bootstrapvz.common.fs.virtualdiskimage import VirtualDiskImage
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from bootstrapvz.common.fs.virtualharddisk import VirtualHardDisk
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from bootstrapvz.common.fs.virtualmachinedisk import VirtualMachineDisk
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from bootstrapvz.common.fs.folder import Folder
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from bootstrapvz.common.fs.logicalvolume import LogicalVolume
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volume_backing = {'raw': LoopbackVolume,
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's3': LoopbackVolume,
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'vdi': VirtualDiskImage,
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'vhd': VirtualHardDisk,
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'vmdk': VirtualMachineDisk,
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'ebs': EBSVolume,
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'folder': Folder,
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'lvm': LogicalVolume
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}.get(data['backing'])
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# Instantiate the partition map
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from bootstrapvz.common.bytes import Bytes
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# Only operate with a physical sector size of 512 bytes for now,
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# not sure if we can change that for some of the virtual disks
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sector_size = Bytes('512B')
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partition_map = partition_map(data['partitions'], sector_size, bootloader)
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# Create the volume with the partition map as an argument
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return volume_backing(partition_map)
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