def resources_setup():
    '''
    This function checks CUDA devices, selects some and installs resources.py
    '''
    print 'i> installing file <resources.py> into home directory if it does not exist.'
    path_current = os.path.dirname( os.path.realpath(__file__) )
    # path to the install version of resources.py.
    path_install = os.path.join(path_current, 'resources')
    # get the path to the local resources.py (on Linux machines it is in ~/.niftypet)
    path_resources = path_niftypet_local()
    print path_current

    # flag for the resources file if already installed (initially assumed not)
    flg_resources = False
    # does the local folder for niftypet exists? if not create one. 
    if not os.path.exists(path_resources):
        os.makedirs(path_resources)
    # is resources.py in the folder?
    if not os.path.isfile(os.path.join(path_resources,'resources.py')):
        if os.path.isfile(os.path.join(path_install,'resources.py')):
            shutil.copyfile( os.path.join(path_install,'resources.py'), os.path.join(path_resources,'resources.py') )
        else:
            print 'e> could not fine file <resources.py> to be installed!'
            raise IOError('could not find <resources.py')
    else:
        print 'i> <resources.py> should be already in the local NiftyPET folder.', path_resources
        # set the flag that the resources file is already there
        flg_resources = True
        sys.path.append(path_resources)
        try:
            import resources
        except ImportError as ie:
            print '----------------------------'
            print 'e> Import Error: NiftyPET''s resources file <resources.py> could not be imported.  It should be in ''~/.niftypet/resources.py'' but likely it does not exists.'
            print '----------------------------'

    # find available GPU devices, select one or more and output the compilation flags
    gpuarch = dev_setup()

    # return gpuarch for cmake compilation
    return gpuarch
This function checks CUDA devices, selects some and installs resources.py