new_contents: #!/usr/bin/env python3
  
  import sys
  import os.path
  import re
  import linecache
  import subprocess
  import urllib.request
  import zipfile
  
  if len(sys.argv) != 2:
      print ('''Invalid usage :
          Usage : ghost-update /path/to/your/ghost
          ''')
      sys.exit(1)
  
  ghostPath = sys.argv[1];
  packageJson = os.path.join(ghostPath, 'package.json')
  
  if os.path.exists(ghostPath) and os.path.isdir(ghostPath):
      if os.path.exists(packageJson):
          pattern = re.compile('"name": "ghost"')
          line = linecache.getline(packageJson, 2)
  
          if re.search(pattern, line) != None:
              # It's a ghost instance
              # Download ghost latest archive
              localName, headers = urllib.request.urlretrieve('https://ghost.org/zip/ghost-latest.zip')
              zip = ZipFile(localName)
              zip.extractall('/tmp/ghost')
  
          else:
              print ("This is not a ghost instance")
              sys.exit(1)
  
      else:
          print ("Invalid path")
          sys.exit(1)
  
  
subject: Check if it's a ghost instance and download latest ghost release