Synnefo » snf-ganeti » Ganeti ExtStorage providers

#!/usr/bin/env python

#

# Copyright (C) 2011 Greek Research and Technology Network

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

# General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA

# 02110-1301, USA.

"""Grow an existing rbd Image

This program grows an existing rbd Image which resides in a

RADOS cluster

It takes it's input from environment variables. Specifically the

following variables should be present:

 - VOL_NAME: The name of the Image to grow

 - POOL:     The RADOS pool in which the Image resides

 - VOL_SIZE: The current Image's size

 - VOL_NEW_SIZE: The new size of the Image after it's grown

Returns 0 upon successful grow, 1 upon failure

"""

import os

import sys

sys.path.append("/usr/share/ganeti")

from ganeti import utils

def ReadEnv():

  """Read the mandatory enviromental variables

  """

  name = os.getenv("VOL_NAME")

  if name is None:

    sys.stderr.write('The environment variable VOL_NAME is missing.\n')

    return None

#  pool = os.getenv("POOL")

  pool = "rbd"

  if pool is None:

    sys.stderr.write('The environment variable POOL is missing.\n')

    return None

  new_size = os.getenv("VOL_NEW_SIZE")

  if new_size is None:

    sys.stderr.write('The environment variable VOL_NEW_SIZE is missing.\n')

    return None

  return (name, pool, new_size)

def main():

  env = ReadEnv()

  if env is None:

    sys.stderr.write('Wrong environment. Aborting...\n')

    return 1

  rbd_name, rbd_pool, new_size = env

  cmd = ["rbd", "resize", "-p", "%s" % rbd_pool, "%s" % rbd_name,

         "--size", "%s" % new_size]

  result = utils.RunCmd(cmd)

  if result.failed:

    sys.stderr.write('rbd resize failed (%s): %s\n' %

                     (result.fail_reason, result.output))

    return 1

  return 0

if __name__ == "__main__":

    sys.exit(main())