Package ganeti :: Package cmdlib :: Module instance_storage :: Class TemporaryDisk

Class TemporaryDisk

Creates a new temporary bootable disk, and makes sure it is destroyed.

Is a context manager, and should be used with the ``with`` statement as such.

The disk is guaranteed to be created at index 0, shifting any other disks of the instance by one place, and allowing the instance to be booted with the content of the disk.

Instance Methods

[hide private]

__init__(self, lu, instance, disks, feedback_fn, shutdown_timeout=constants.DEFAULT_SHUTDOWN_TIMEOUT)
Constructor storing arguments until used later.

source code

_EnsureInstanceDiskState(self)
Ensures that the instance is down, and its disks inactive.

source code

ganeti.objects.Disk

__enter__(self)
Context manager entry function, creating the disk.

source code

__exit__(self, exc_type, _value, _traceback)
Context manager exit function, destroying the disk.

source code

Method Details

[hide private]

init(self, lu, instance, disks, feedback_fn, shutdown_timeout=constants.DEFAULT_SHUTDOWN_TIMEOUT)
(Constructor)

source code

Constructor storing arguments until used later.

Parameters:

lu (ganeti.cmdlib.base.LogicalUnit) - The LU within which this disk is created.
instance (ganeti.objects.Instance) - The instance to which the disk should be added
disks (list of triples (disk template, disk access mode, int)) - disk specification, which is a list of triples containing the disk template (e.g., constants.DT_PLAIN), the disk access mode (i.e., constants.DISK_RDONLY or constants.DISK_RDWR), and size in MiB.
feedback_fn (function) - Function used to log progress

_EnsureInstanceDiskState(self)

source code

Ensures that the instance is down, and its disks inactive.

All the operations related to the creation and destruction of disks require that the instance is down and that the disks are inactive. This function is invoked to make it so.

enter(self)

source code

Context manager entry function, creating the disk.

Returns: ganeti.objects.Disk: The disk object created.

Class TemporaryDisk

__init__(self, lu, instance, disks, feedback_fn, shutdown_timeout=constants.DEFAULT_SHUTDOWN_TIMEOUT) (Constructor)

_EnsureInstanceDiskState(self)

__enter__(self)

init(self, lu, instance, disks, feedback_fn, shutdown_timeout=constants.DEFAULT_SHUTDOWN_TIMEOUT)
(Constructor)

enter(self)