Add recipe uuid

This recipe generate uuid and store them in a sqlite database.

slapos/recipe/_uuid.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 sqlite3
+import uuid
+
+from slapos.recipe.librecipe import GenericBaseRecipe
+
+class UIDDatabase(object):
+
+  def __init__(self, database_path, name):
+    if not os.path.exists(database_path):
+      open(database_path, 'w').close() # Just a touch
+    self.database_path = database_path
+    self.name = name
+
+  def __enter__(self):
+    self.database = sqlite3.connect(self.database_path)
+
+    if self.get_result("""SELECT * FROM sqlite_master
+                          WHERE type = ? AND name = ?;
+                       """, ('table', self.name)) is None:
+      self.database.execute("""CREATE TABLE "%s" (
+        name TEXT PRIMARY KEY,
+        uuid TEXT
+      );""" % self.name)
+    return self
+
+  def __exit__(self, exc_type, exc_value, traceback):
+    self.database.close()
+
+  def get_result(self, request, data):
+    results = self.database.execute(request, data)
+    return results.fetchone()
+
+  def get_uuid(self, name):
+    uuid_value = self.get_result(
+      'SELECT * FROM "%s" WHERE name = ?;' % self.name,
+      (name, )
+    )
+    if uuid_value is None:
+      uuid_value = uuid.uuid4().urn
+      self.database.execute('INSERT INTO "%s" VALUES (?, ?);' % self.name,
+                            (name, uuid_value))
+      self.database.commit()
+    else:
+      uuid_value = uuid_value[1]
+    return uuid_value
+
+
+class Recipe(GenericBaseRecipe):
+
+
+  def _options(self, options):
+    with UIDDatabase(self.options['database'], self.name) as database:
+      uuid_name_list = [str(name).strip()
+                        for name in options['uuids'].split(' ')]
+      for uuid_name in uuid_name_list:
+        options[str('uuid-%s' % uuid_name)] = str(database.get_uuid(uuid_name))
+
+  def install(self):
+    return []