Adding waitfor recipe.

This recipe waitfor files to be created.
It uses shlex to split command line.

A part of this recipe looks like :
  [waitfor]
  recipe = slapos.cookbook:waitfor
  command-line = executable "with escaped arguments" if\ needed
  files =
    one-file/per/line
    another/file.txt

setup.py

@@ -92,6 +92,7 @@ setup(name=name,
           'testnode = slapos.recipe.testnode:Recipe',
           'urlparse = slapos.recipe._urlparse:Recipe',
           'vifib = slapos.recipe.vifib:Recipe',
+          'waitfor = slapos.recipe.waitfor:Recipe',
           'xwiki = slapos.recipe.xwiki:Recipe',
           'zabbixagent = slapos.recipe.zabbixagent:Recipe',
       ]},

slapos/recipe/waitfor.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 shlex
+
+from slapos.recipe.librecipe import GenericBaseRecipe
+
+class Recipe(GenericBaseRecipe):
+
+  def install(self):
+    files = [f for f in self.options['files'].split('\n') if f]
+    command_line = shlex.split(self.options['command-line'])
+    wrapper = self.createPythonScript(
+      self.options['wrapper'],
+      'slapos.recipe.librecipe.execute.execute_wait',
+      [ command_line,
+        files ],
+    )
+    return [wrapper]