Commit 69683c7d authored by Hrvoje Ribicic's avatar Hrvoje Ribicic
Browse files

Add image size estimation function

To create a temporary disk, it is necessary to know just how big this
disk must be. This patch adds a function that retrieves this
information for both data sources - a URL and a file.
Signed-off-by: default avatarHrvoje Ribicic <>
Reviewed-by: default avatarJose A. Lopes <>
parent 21a17f33
......@@ -21,8 +21,10 @@
"""Logical units dealing with backup operations."""
import urllib2
import OpenSSL
import logging
import math
from ganeti import compat
from ganeti import constants
......@@ -325,6 +327,54 @@ class LUBackupExport(LogicalUnit):
" on node %s: %s", iname,
self.cfg.GetNodeName(node_uuid), msg)
def _DetermineImageSize(self, image_path, node_uuid):
""" Determines the size of the specified image.
@type image_path: string
@param image_path: The disk path or a URL of an image.
@type node_uuid: string
@param node_uuid: If a file path is used,
@raise OpExecError: If the image does not exist.
@rtype: int
@return: The size in MB, rounded up.
# Check if we are dealing with a URL first
class _HeadRequest(urllib2.Request):
def get_method(self):
return "HEAD"
if utils.IsUrl(image_path):
response = urllib2.urlopen(_HeadRequest(image_path))
except urllib2.URLError:
raise errors.OpExecError("Could not retrieve image from given url %s" %
content_length_str ='content-length')
if not content_length_str:
raise errors.OpExecError(
"Cannot create temporary disk: size of zeroing image at path %s "
"could not be retrieved through HEAD request" % image_path
byte_size = int(content_length_str)
# We end up here if a file path is used
result = self.rpc.call_get_file_info(node_uuid, image_path)
result.Raise("Cannot determine the size of file %s" % image_path)
success, attributes = result.payload
if not success:
raise errors.OpExecError("Could not open file %s" % image_path)
byte_size = attributes[constants.STAT_SIZE]
# Finally, the conversion
return math.ceil(byte_size / 1024. / 1024.)
def Exec(self, feedback_fn):
"""Export an instance to an image in the cluster.
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