Synnefo » snf-image

#!/usr/bin/env python

#

# Copyright (c) 2011 Greek Research and Technology Network

#

"""Personalize an Image by injecting files

This hook injects files into the filesystem of an Image.

The files are passed to the hook through the Ganeti

OS interface and found in the variable OSP_IMG_PERSONALITY.

"""

import sys

import os

import json

import datetime

import base64

def timestamp():

    now = datetime.datetime.now()

    current_time = now.strftime("%Y%m%d.%H%M%S")

    return current_time

def main():

    if not os.environ.has_key('SNF_IMAGE_TARGET'):

        sys.stderr.write('Error: SNF_IMAGE_TARGET variable is missing\n')

        return 1

    target = os.environ['SNF_IMAGE_TARGET']

    if not os.path.isdir(target):

        sys.stderr.write('Error: Target: `'+target+'\' is not a directory.\n')

        return 2

    if os.environ.has_key('SNF_IMAGE_PERSONALITY'):

        osp_img_personality = os.environ['SNF_IMAGE_PERSONALITY']

        files = json.loads(osp_img_personality)

        for f in files:

            real_path = target + '/' + f['path']

            if os.path.lexists(real_path):

                backup_file = real_path + '.bak.' + timestamp()

                os.rename(real_path, backup_file)

            file = file(real_path, 'w')

            file.write(base64.b64decode(f['contents']))

            file.close()

            os.chmod(real_path, 0440)

        sys.stderr.write('Successful personalization of Image\n')

    else:

        sys.stderr.write('This Image has no personality (0 files to inject)\n')

    return 0

if __name__ == "__main__":

    sys.exit(main())

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