Add promise recipe checking if url returns http code 200

setup.py

@@ -48,6 +48,7 @@ setup(name=name,
           'certificate_authority = slapos.recipe.certificate_authority:Recipe',
           'certificate_authority.request = slapos.recipe.certificate_authority:Request',
           'check_port_listening = slapos.recipe.check_port_listening:Recipe',
+          'check_url_available = slapos.recipe.check_url_available:Recipe',
           'cron = slapos.recipe.dcron:Recipe',
           'cron.d = slapos.recipe.dcron:Part',
           'davstorage = slapos.recipe.davstorage:Recipe',

slapos/recipe/check_url_available/__init__.py

+##############################################################################
+#
+# Copyright (c) 2011 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.
+#
+##############################################################################
+from slapos.recipe.librecipe import GenericBaseRecipe
+import sys
+
+class Recipe(GenericBaseRecipe):
+  """
+  Create script that will check if "url" is available (e.g page answers 200 OK).
+  """
+
+  def install(self):
+    config = {
+      'url': self.options['url'],
+      'shell_path': self.options['dash_path'],
+    }
+
+    # XXX-Cedric in this script, curl won't check certificate
+    promise = self.createExecutable(
+      self.options['path'],
+      self.substituteTemplate(self.getTemplateFilename('check_url.in'), config)
+    )
+
+    return [promise]

slapos/recipe/check_url_available/template/check_url.in

+#!%(shell_path)s
+# BEWARE: This file is operated by slapgrid
+# BEWARE: It will be overwritten automatically
+
+URL="%(url)s"
+CODE=$(curl -k -sL $URL -w %%{http_code} -o /dev/null)
+
+if [ $CODE -eq 000 ]; then
+  echo "$URL is not available (server not reachable)" >&2
+  exit 1
+fi
+
+if ! [ $CODE -eq 200 ]; then
+  echo "$URL is not available (returned $CODE)" >&2
+  exit 2
+fi