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263 lines
7.4 KiB
Python
263 lines
7.4 KiB
Python
#!/usr/bin/env python3
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# vim: set ts=2 sw=2 et sts=2 ai:
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#
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# Copyright 2009 Google Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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# Disable the invalid name warning as we are inheriting from a standard library
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# object.
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# pylint: disable=invalid-name,protected-access
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"""
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Stripped down version of `python-datetime-tz`
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( https://github.com/mithro/python-datetime-tz/blob/master/datetime_tz/__init__.py )
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that only contains the "find local timezone" bits.
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"""
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import datetime
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import os.path
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import time
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import warnings
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import pytz
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# Need to patch pytz.utc to have a _utcoffset so you can normalize/localize
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# using it.
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pytz.utc._utcoffset = datetime.timedelta()
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timedelta = datetime.timedelta
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def _tzinfome(tzinfo):
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"""Gets a tzinfo object from a string.
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Args:
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tzinfo: A string (or string like) object, or a datetime.tzinfo object.
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Returns:
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An datetime.tzinfo object.
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Raises:
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UnknownTimeZoneError: If the timezone given can't be decoded.
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"""
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if not isinstance(tzinfo, datetime.tzinfo):
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try:
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tzinfo = pytz.timezone(tzinfo)
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assert tzinfo.zone in pytz.all_timezones
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except AttributeError:
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raise pytz.UnknownTimeZoneError("Unknown timezone! %s" % tzinfo)
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return tzinfo
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# Our "local" timezone
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_localtz = None
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def localtz():
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"""Get the local timezone.
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Returns:
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The localtime timezone as a tzinfo object.
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"""
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# pylint: disable=global-statement
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global _localtz
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if _localtz is None:
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_localtz = detect_timezone()
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return _localtz
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def detect_timezone():
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"""Try and detect the timezone that Python is currently running in.
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We have a bunch of different methods for trying to figure this out (listed in
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order they are attempted).
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* In windows, use win32timezone.TimeZoneInfo.local()
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* Try TZ environment variable.
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* Try and find /etc/timezone file (with timezone name).
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* Try and find /etc/localtime file (with timezone data).
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* Try and match a TZ to the current dst/offset/shortname.
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Returns:
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The detected local timezone as a tzinfo object
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Raises:
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pytz.UnknownTimeZoneError: If it was unable to detect a timezone.
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"""
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# First we try the TZ variable
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tz = _detect_timezone_environ()
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if tz is not None:
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return tz
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# Second we try /etc/timezone and use the value in that
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tz = _detect_timezone_etc_timezone()
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if tz is not None:
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return tz
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# Next we try and see if something matches the tzinfo in /etc/localtime
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tz = _detect_timezone_etc_localtime()
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if tz is not None:
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return tz
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# Next we try and use a similiar method to what PHP does.
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# We first try to search on time.tzname, time.timezone, time.daylight to
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# match a pytz zone.
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warnings.warn("Had to fall back to worst detection method (the 'PHP' "
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"method).")
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tz = _detect_timezone_php()
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if tz is not None:
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return tz
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raise pytz.UnknownTimeZoneError("Unable to detect your timezone!")
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def _detect_timezone_environ():
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if "TZ" in os.environ:
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try:
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return pytz.timezone(os.environ["TZ"])
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except (IOError, pytz.UnknownTimeZoneError):
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warnings.warn("You provided a TZ environment value (%r) we did not "
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"understand!" % os.environ["TZ"])
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def _detect_timezone_etc_timezone():
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if os.path.exists("/etc/timezone"):
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try:
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tz = open("/etc/timezone").read().strip()
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try:
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return pytz.timezone(tz)
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except (IOError, pytz.UnknownTimeZoneError) as ei:
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warnings.warn("Your /etc/timezone file references a timezone (%r) that"
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" is not valid (%r)." % (tz, ei))
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# Problem reading the /etc/timezone file
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except IOError as eo:
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warnings.warn("Could not access your /etc/timezone file: %s" % eo)
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def _load_local_tzinfo():
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"""Load zoneinfo from local disk."""
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tzdir = os.environ.get("TZDIR", "/usr/share/zoneinfo/posix")
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localtzdata = {}
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for dirpath, _, filenames in os.walk(tzdir):
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for filename in filenames:
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filepath = os.path.join(dirpath, filename)
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name = os.path.relpath(filepath, tzdir)
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f = open(filepath, "rb")
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tzinfo = pytz.tzfile.build_tzinfo(name, f)
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f.close()
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localtzdata[name] = tzinfo
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return localtzdata
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def _detect_timezone_etc_localtime():
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"""Detect timezone based on /etc/localtime file."""
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matches = []
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if os.path.exists("/etc/localtime"):
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f = open("/etc/localtime", "rb")
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localtime = pytz.tzfile.build_tzinfo("/etc/localtime", f)
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f.close()
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# We want to match against the local database because /etc/localtime will
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# be copied from that. Once we have found a name for /etc/localtime, we can
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# use the name to get the "same" timezone from the inbuilt pytz database.
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tzdatabase = _load_local_tzinfo()
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if tzdatabase:
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tznames = tzdatabase.keys()
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tzvalues = tzdatabase.__getitem__
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else:
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tznames = pytz.all_timezones
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tzvalues = _tzinfome
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# See if we can find a "Human Name" for this..
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for tzname in tznames:
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tz = tzvalues(tzname)
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if dir(tz) != dir(localtime):
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continue
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for attrib in dir(tz):
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# Ignore functions and specials
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if callable(getattr(tz, attrib)) or attrib.startswith("__"):
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continue
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# This will always be different
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if attrib == "zone" or attrib == "_tzinfos":
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continue
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if getattr(tz, attrib) != getattr(localtime, attrib):
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break
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# We get here iff break didn't happen, i.e. no meaningful attributes
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# differ between tz and localtime
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else:
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# Try and get a timezone from pytz which has the same name as the zone
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# which matches in the local database.
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if tzname not in pytz.all_timezones:
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warnings.warn("Skipping %s because not in pytz database." % tzname)
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continue
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matches.append(_tzinfome(tzname))
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matches.sort(key=lambda x: x.zone)
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if len(matches) == 1:
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return matches[0]
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if len(matches) > 1:
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warnings.warn("We detected multiple matches for your /etc/localtime. "
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"(Matches where %s)" % matches)
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return matches[0]
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else:
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warnings.warn("We detected no matches for your /etc/localtime.")
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# Register /etc/localtime as the timezone loaded.
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pytz._tzinfo_cache["/etc/localtime"] = localtime
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return localtime
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def _detect_timezone_php():
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tomatch = (time.tzname[0], time.timezone, time.daylight)
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now = datetime.datetime.now()
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matches = []
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for tzname in pytz.all_timezones:
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try:
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tz = pytz.timezone(tzname)
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except IOError:
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continue
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try:
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indst = tz.localize(now).timetuple()[-1]
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if tomatch == (tz._tzname, -tz._utcoffset.seconds, indst):
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matches.append(tzname)
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# pylint: disable=pointless-except
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except AttributeError:
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pass
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if len(matches) > 1:
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warnings.warn("We detected multiple matches for the timezone, choosing "
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"the first %s. (Matches where %s)" % (matches[0], matches))
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if matches:
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return pytz.timezone(matches[0])
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