bootstrap-vz/bootstrapvz/common/tasks/loopback.py

from bootstrapvz.base import Task
from bootstrapvz.common import phases
import host
import volume


class AddRequiredCommands(Task):
	description = 'Adding commands required for creating loopback volumes'
	phase = phases.preparation
	successors = [host.CheckExternalCommands]

	@classmethod
	def run(cls, info):
		from ..fs.loopbackvolume import LoopbackVolume
		from ..fs.qemuvolume import QEMUVolume
		if type(info.volume) is LoopbackVolume:
			info.host_dependencies['losetup'] = 'mount'
			info.host_dependencies['truncate'] = 'coreutils'
		if isinstance(info.volume, QEMUVolume):
			info.host_dependencies['qemu-img'] = 'qemu-utils'


class Create(Task):
	description = 'Creating a loopback volume'
	phase = phases.volume_creation
	successors = [volume.Attach]

	@classmethod
	def run(cls, info):
		import os.path
		image_path = os.path.join(info.workspace, 'volume.' + info.volume.extension)
		info.volume.create(image_path)