Add onetimedownload

a simple script which download any http resource
and save it into a specified file_path

usage: onetimedownload URL FILE_PATH

setup.py

@@ -44,6 +44,7 @@ setup(name=name,
           'cloudstart = slapos.cloudmgr.start:main',
           'cloudstop = slapos.cloudmgr.stop:main',
           'onetimeupload = slapos.onetimeupload:main',
+          'onetimedownload = slapos.onetimedownload:main',
           'shacache = slapos.shacache:main',
           'slapbuilder = slapos.builder:main',
           'slapmonitor = slapos.monitor:run_slapmonitor',

slapos/onetimedownload/__init__.py

+##############################################################################
+#
+# Copyright (c) 2010 Vifib SARL and Contributors. All Rights Reserved.
+#
+# WARNING: This program as such is intended to be used by professional
+# programmers who take the whole responsibility of assessing all potential
+# consequences resulting from its eventual inadequacies and bugs
+# End users who are looking for a ready-to-use solution with commercial
+# guarantees and support are strongly adviced to contract a Free Software
+# Service Company
+#
+# 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 3
+# 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+#
+##############################################################################
+import os
+import sys
+from optparse import OptionParser, Option
+import urllib
+
+
+class Parser(OptionParser):
+  """
+  Parse all arguments.
+  """
+
+  def check_args(self):
+    """
+    Check arguments
+    """
+    (options, args) = self.parse_args()
+    if len(args) != 2:
+      self.error("Incorrect number of arguments")
+    url, file_path = args
+
+    return url, file_path
+
+class Config:
+  def setConfig(self, url, file_path):
+    """
+    Set options given by parameters.
+    """
+    self.url = url
+    self.file_path = file_path
+
+def onetimedownload(url, file_path):
+  url_file = urllib.urlopen(url)
+  data = url_file.read()
+  file_object = open(file_path, 'w')
+  file_object.write(data)
+  file_object.close()
+
+def main():
+  "Run default configuration."
+  usage = "usage: onetimedownload URL FILE_PATH"
+
+  try:
+    # Parse arguments
+    config = Config()
+    config.setConfig(*Parser(usage=usage).check_args())
+
+    onetimedownload(config.url, config.file_path)
+    return_code = 0
+  except SystemExit, err:
+    # Catch exception raise by optparse
+    return_code = err
+
+  sys.exit(return_code)
+