import logging import os import tempfile import shutil import json from subprocess import check_call import tarfile from tarfile import TarFile from dateutil.zoneinfo import METADATA_FN, ZONEFILENAME def rebuild(filename, tag=None, format="gz", zonegroups=[], metadata=None): """Rebuild the internal timezone info in dateutil/zoneinfo/zoneinfo*tar* filename is the timezone tarball from ``ftp.iana.org/tz``. """ tmpdir = tempfile.mkdtemp() zonedir = os.path.join(tmpdir, "zoneinfo") moduledir = os.path.dirname(__file__) try: with TarFile.open(filename) as tf: # Limit extraction to safe, plain data files, if this Python # allows it easily. If not, just trust the input. # See: https://docs.python.org/3/library/tarfile.html#supporting-older-python-versions tf.extraction_filter = getattr(tarfile, 'data_filter', (lambda member, path: member)) for name in zonegroups: tf.extract(name, tmpdir) filepaths = [os.path.join(tmpdir, n) for n in zonegroups] try: check_call(["zic", "-d", zonedir] + filepaths) except OSError as e: _print_on_nosuchfile(e) raise # write metadata file with open(os.path.join(zonedir, METADATA_FN), 'w') as f: json.dump(metadata, f, indent=4, sort_keys=True) target = os.path.join(moduledir, ZONEFILENAME) with TarFile.open(target, "w:%s" % format) as tf: for entry in os.listdir(zonedir): entrypath = os.path.join(zonedir, entry) tf.add(entrypath, entry) finally: shutil.rmtree(tmpdir) def _print_on_nosuchfile(e): """Print helpful troubleshooting message e is an exception raised by subprocess.check_call() """ if e.errno == 2: logging.error( "Could not find zic. Perhaps you need to install " "libc-bin or some other package that provides it, " "or it's not in your PATH?")