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#!/usr/bin/env python

#http://stackoverflow.com/questions/7669938/get-the-olson-tz-name-for-the-local-timezone
from hashlib import sha224
import os
from os import listdir
from os.path import join, isfile, isdir

infoDir = '/usr/share/zoneinfo/'

def get_current_olsonname():
    result = []
    tzfile_digest = sha224(open('/etc/localtime').read()).hexdigest()

    test_match = lambda filepath: sha224(open(filepath).read()).hexdigest() == tzfile_digest

    def walk_over(dirpath):
        for root, dirs, filenames in os.walk(dirpath):
            for fname in filenames:
                fpath = join(root, fname)
                if test_match(fpath):
                    result.append(tuple(root.split('/')[4:]+[fname]))

    for dname in listdir(infoDir):
        if dname in ('posix', 'right', 'SystemV', 'Etc'):
            continue
        dpath = join(infoDir, dname)
        if not isdir(dpath):
            continue
        walk_over(dpath)

    if not result:
        walk_over(join(infoDir))

    return result


if __name__ == '__main__':
    print get_current_olsonname()