Source Code for Module ganeti.utils.tags

 1  # 
 2  # 
 3   
 4  # Copyright (C) 2015 Google Inc. 
 5  # All rights reserved. 
 6  # 
 7  # Redistribution and use in source and binary forms, with or without 
 8  # modification, are permitted provided that the following conditions are 
 9  # met: 
10  # 
11  # 1. Redistributions of source code must retain the above copyright notice, 
12  # this list of conditions and the following disclaimer. 
13  # 
14  # 2. Redistributions in binary form must reproduce the above copyright 
15  # notice, this list of conditions and the following disclaimer in the 
16  # documentation and/or other materials provided with the distribution. 
17  # 
18  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 
19  # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 
20  # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 
21  # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 
22  # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 
23  # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 
24  # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
25  # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
26  # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 
27  # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 
28  # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
29   
30  """Utility functions for tag related operations 
31   
32  """ 
33   
34  from ganeti import constants 
35   
36   
37 -def GetExclusionPrefixes(ctags): 
38    """Extract the exclusion tag prefixes from the cluster tags 
39   
40    """ 
41    prefixes = set([]) 
42    for tag in ctags: 
43      if tag.startswith(constants.EX_TAGS_PREFIX): 
44        prefixes.add(tag[len(constants.EX_TAGS_PREFIX):]) 
45    return prefixes 
46   
47   
48 -def IsGoodTag(prefixes, tag): 
49    """Decide if a string is a tag 
50   
51    @param prefixes: set of prefixes that would indicate 
52        the tag being suitable 
53    @param tag: the tag in question 
54   
55    """ 
56    for prefix in prefixes: 
57      if tag.startswith(prefix): 
58        return True 
59    return False 
60