code.grnet.gr Git - snf-image/blob - snf-image-helper/tasks/40EnforcePersonality

   1 #!/usr/bin/env python
   2
   3 ### BEGIN TASK INFO
   4 # Provides:             EnforcePersonality
   5 # RunBefore:            UmountImage
   6 # RunAfter:             MountImage
   7 # Short-Description:    Inject files to the instance
   8 ### END TASK INFO
   9
  10 """Personalize an Image by injecting files
  11
  12 This hook injects files into the filesystem of an Image.
  13 The files are passed to the hook through the Ganeti
  14 OS interface and found in the variable OSP_IMG_PERSONALITY.
  15
  16 """
  17
  18 import sys
  19 import os
  20 import json
  21 import datetime
  22 import base64
  23
  24
  25 def timestamp():
  26     now = datetime.datetime.now()
  27     current_time = now.strftime("%Y%m%d.%H%M%S")
  28     return current_time
  29
  30
  31 def main():
  32     if not os.environ.has_key('SNF_IMAGE_TARGET'):
  33         sys.stderr.write('Error: SNF_IMAGE_TARGET variable is missing\n')
  34         return 1
  35
  36     target = os.environ['SNF_IMAGE_TARGET']
  37     if not os.path.isdir(target):
  38         sys.stderr.write('Error: Target: `'+target+'\' is not a directory.\n')
  39         return 2
  40
  41     if os.environ.has_key('SNF_IMAGE_PERSONALITY'):
  42         osp_img_personality = os.environ['SNF_IMAGE_PERSONALITY']
  43         files = json.loads(osp_img_personality)
  44         for f in files:
  45             real_path = target + '/' + f['path']
  46             if os.path.lexists(real_path):
  47                 backup_file = real_path + '.bak.' + timestamp()
  48                 os.rename(real_path, backup_file)
  49             newfile = open(real_path, 'w')
  50             newfile.write(base64.b64decode(f['contents']))
  51             newfile.close()
  52             os.chmod(real_path, 0440)
  53         sys.stderr.write('Successful personalization of Image\n')
  54     else:
  55         sys.stderr.write('This Image has no personality (0 files to inject)\n')
  56     return 0
  57
  58
  59 if __name__ == "__main__":
  60     sys.exit(main())
  61
  62 # vim: set sta sts=4 shiftwidth=4 sw=4 et ai :