#!/usr/bin/env python

# Software License Agreement (BSD License)
#
# Copyright (c) 2009, Eucalyptus Systems, Inc.
# All rights reserved.
#
# Redistribution and use of this software in source and binary forms, with or
# without modification, are permitted provided that the following conditions
# are met:
#
#   Redistributions of source code must retain the above
#   copyright notice, this list of conditions and the
#   following disclaimer.
#
#   Redistributions in binary form must reproduce the above
#   copyright notice, this list of conditions and the
#   following disclaimer in the documentation and/or other
#   materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# Author: Neil Soman neil@eucalyptus.com

import getopt, sys, os
from euca2ools import Euca2ool, VolumeValidationError, InstanceValidationError, Util

usage_string = """
Attaches a volume to an instance.

euca-attach-volume -i, --instance instance_id -d, --device device 
[-h, --help] [--version] [--debug] volume_id 

REQUIRED PARAMETERS

-i, --instance 			unique id of a running instance to attach the volume to.

-d, --device			local device name (inside the guest VM) to use.

volume_id			unique id for a volume to attach.

OPTIONAL PARAMETERS

"""

version_string = """    euca-attach-volume version: 1.0 (BSD)"""

def usage():
    print usage_string
    Util().usage()

def version():
    print version_string
    sys.exit()

def main():
    euca = None
    try:
        euca = Euca2ool('i:d:',
                                   ['instance=', 'device='])
    except Exception, e:
	print e
        usage()

    volume_id = None
    instance_id = None
    device = None

    for name, value in euca.opts:
        if name in ('-i', '--instance'):
            instance_id = value 
        elif name in ('-d', '--device'):
            device = value 
        elif name in ('-h', '--help'):
            usage()
	elif name == '--version':
	    version()
    
    euca_conn = euca.make_connection()

    for arg in euca.args:
  	volume_id = arg
	break

    if volume_id and instance_id and device:
        try:
            euca.validate_volume_id(volume_id)
	except VolumeValidationError:
	    print 'Invalid volume id'
	    sys.exit(1)
	try:
	    euca.validate_instance_id(instance_id)
        except InstanceValidationError:
   	    print 'Invalid instance id' 
            sys.exit(1)

	try:
	    return_code = euca_conn.attach_volume(volume_id = volume_id, 
					instance_id = instance_id,
					device = device)
        except Exception, ex:
            euca.display_error_and_exit('%s' % ex)

	if return_code:
	    print 'VOLUME\t%s' % (volume_id)
    else:
	if not volume_id:
    	    print 'volume_id must be specified'
	if not instance_id:
    	    print 'instance_id must be specified'
	if not device:
    	    print 'device must be specified'
 	usage()
if __name__ == "__main__":
    main()
 
