def clone(self, parent_img_name, parent_snap_name, clone_img_name):
try:
parent_context = child_context = self.context
self.rbd.clone(parent_context,
parent_img_name,
parent_snap_name,
child_context,
clone_img_name,
features=1)
return True
except rbd.ImageNotFound:
# Can be raised if the img or snap is not found
if parent_img_name not in self.list_images():
img_name = parent_img_name
else:
img_name = parent_snap_name
raise file_system_exceptions.ImageNotFoundException(img_name)
except rbd.ImageExists:
raise file_system_exceptions.ImageExistsException(clone_img_name)
# No Clue when will this be raised so not testing
except rbd.FunctionNotSupported:
raise file_system_exceptions.FunctionNotSupportedException()
# No Clue when will this be raised so not testing
except rbd.ArgumentOutOfRange:
raise file_system_exceptions.ArgumentsOutOfRangeException()
def read(self, img_id, offset, length):
"""
Read data from the image
:param img_id: what the image is called
:param offset: the offset to start reading at
:param length: how many bytes to read
:return: str - a string of the data read
"""
try:
with self.__open_image(img_id) as img:
return img.read(offset, length)
except rbd.ImageNotFound:
raise file_system_exceptions.ImageNotFoundException(img_id)
except rbd.InvalidArgument:
raise file_system_exceptions.ArgumentsOutOfRangeException()
def write(self, img_id, data, offset):
"""
Write data to the image
:param img_id: what the image is called
:param data: the data to be written
:param offset: where to start writing data
:return: int - the number of bytes written
"""
try:
with self.__open_image(img_id) as img:
return img.write(data, offset)
except rbd.ImageNotFound:
raise file_system_exceptions.ImageNotFoundException(img_id)
except rbd.InvalidArgument:
raise file_system_exceptions.ArgumentsOutOfRangeException()