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110 lines
3.5 KiB
Python
110 lines
3.5 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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Copyright (c) 2003-2005 Gustavo Niemeyer <gustavo@niemeyer.net>
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This module offers extensions to the standard Python
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datetime module.
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"""
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import logging
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import os
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from subprocess import call
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from tarfile import TarFile
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from dateutil.tz import tzfile
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__author__ = "Tomi Pieviläinen <tomi.pievilainen@iki.fi>"
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__license__ = "Simplified BSD"
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__all__ = ["setcachesize", "gettz", "rebuild"]
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CACHE = []
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CACHESIZE = 10
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class tzfile(tzfile):
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def __reduce__(self):
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return (gettz, (self._filename,))
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def getzoneinfofile():
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filenames = sorted(os.listdir(os.path.join(os.path.dirname(__file__))))
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filenames.reverse()
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for entry in filenames:
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if entry.startswith("zoneinfo") and ".tar." in entry:
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return os.path.join(os.path.dirname(__file__), entry)
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return None
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ZONEINFOFILE = getzoneinfofile()
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del getzoneinfofile
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def setcachesize(size):
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global CACHESIZE, CACHE
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CACHESIZE = size
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del CACHE[size:]
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def gettz(name):
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tzinfo = None
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if ZONEINFOFILE:
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for cachedname, tzinfo in CACHE:
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if cachedname == name:
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break
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else:
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tf = TarFile.open(ZONEINFOFILE)
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try:
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zonefile = tf.extractfile(name)
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except KeyError:
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tzinfo = None
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else:
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tzinfo = tzfile(zonefile)
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tf.close()
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CACHE.insert(0, (name, tzinfo))
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del CACHE[CACHESIZE:]
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return tzinfo
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def rebuild(filename, tag=None, format="gz"):
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"""Rebuild the internal timezone info in dateutil/zoneinfo/zoneinfo*tar*
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filename is the timezone tarball from ftp.iana.org/tz.
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"""
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import tempfile, shutil
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tmpdir = tempfile.mkdtemp()
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zonedir = os.path.join(tmpdir, "zoneinfo")
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moduledir = os.path.dirname(__file__)
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if tag: tag = "-"+tag
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targetname = "zoneinfo%s.tar.%s" % (tag, format)
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try:
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tf = TarFile.open(filename)
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# The "backwards" zone file contains links to other files, so must be
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# processed as last
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for name in sorted(tf.getnames(),
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key=lambda k: k != "backward" and k or "z"):
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if not (name.endswith(".sh") or
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name.endswith(".tab") or
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name == "leapseconds"):
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tf.extract(name, tmpdir)
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filepath = os.path.join(tmpdir, name)
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try:
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# zic will return errors for nontz files in the package
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# such as the Makefile or README, so check_call cannot
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# be used (or at least extra checks would be needed)
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call(["zic", "-d", zonedir, filepath])
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except OSError as e:
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if e.errno == 2:
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logging.error(
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"Could not find zic. Perhaps you need to install "
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"libc-bin or some other package that provides it, "
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"or it's not in your PATH?")
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raise
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tf.close()
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target = os.path.join(moduledir, targetname)
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for entry in os.listdir(moduledir):
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if entry.startswith("zoneinfo") and ".tar." in entry:
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os.unlink(os.path.join(moduledir, entry))
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tf = TarFile.open(target, "w:%s" % format)
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for entry in os.listdir(zonedir):
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entrypath = os.path.join(zonedir, entry)
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tf.add(entrypath, entry)
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tf.close()
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finally:
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shutil.rmtree(tmpdir)
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