720 

   721 def getrepofeatures():

   722     """Obtain set of repository features in use.

   723 

   724     HGREPOFEATURES can be used to define or remove features. It contains

   725     a space-delimited list of feature strings. Strings beginning with ``-``

   726     mean to remove.

   727     """

   728     # Default list provided by core.

   729     features = {

   730         'revlogstore',

   731     }

   732 

   733     # Features that imply other features.

   734     implies = {

   735         'simplestore': ['-revlogstore'],

   736     }

   737 

   738     for override in os.environ.get('HGREPOFEATURES', '').split(' '):

   739         if not override:

   740             continue

   741 

   742         if override.startswith('-'):

   743             if override[1:] in features:

   744                 features.remove(override[1:])

   745         else:

   746             features.add(override)

   747 

   748             for imply in implies.get(override, []):

   749                 if imply.startswith('-'):

   750                     if imply[1:] in features:

   751                         features.remove(imply[1:])

   752                 else:

   753                     features.add(imply)

   754 

   755     return features

   756 

   757 @check('reporevlogstore', 'repository using the default revlog store')

   758 def has_reporevlogstore():

   759     return 'revlogstore' in getrepofeatures()

   760 

   761 @check('reposimplestore', 'repository using simple storage extension')

   762 def has_reposimplestore():

   763     return 'simplestore' in getrepofeatures()