# taken from plone

import os

bin_search_path = [

    '/usr/bin',

    '/usr/local/bin',

    ]

class MissingBinary(Exception): pass

def bin_search(binary):

    """search the bin_search_path  for a given binary

    returning its fullname or None"""

    result = None

    mode   = os.R_OK | os.X_OK

    for p in bin_search_path:

        path = os.path.join(p, binary)

        if os.access(path, mode) == 1:

            result = path

            break

    else:

        raise MissingBinary('Unable to find binary "%s"' % binary)

    return result