216 lines
7.3 KiB
Python
216 lines
7.3 KiB
Python
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import os
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import re
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import sys
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import warnings
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from datetime import timezone
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import pytz_deprecation_shim as pds
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from tzlocal import utils
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if sys.version_info >= (3, 9):
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from zoneinfo import ZoneInfo # pragma: no cover
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else:
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from backports.zoneinfo import ZoneInfo # pragma: no cover
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_cache_tz = None
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_cache_tz_name = None
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def _get_localzone_name(_root="/"):
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"""Tries to find the local timezone configuration.
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This method finds the timezone name, if it can, or it returns None.
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The parameter _root makes the function look for files like /etc/localtime
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beneath the _root directory. This is primarily used by the tests.
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In normal usage you call the function without parameters."""
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# First try the ENV setting.
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tzenv = utils._tz_name_from_env()
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if tzenv:
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return tzenv
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# Are we under Termux on Android?
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if os.path.exists(os.path.join(_root, "system/bin/getprop")):
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import subprocess
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androidtz = (
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subprocess.check_output(["getprop", "persist.sys.timezone"])
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.strip()
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.decode()
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)
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return androidtz
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# Now look for distribution specific configuration files
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# that contain the timezone name.
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# Stick all of them in a dict, to compare later.
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found_configs = {}
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for configfile in ("etc/timezone", "var/db/zoneinfo"):
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tzpath = os.path.join(_root, configfile)
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try:
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with open(tzpath, "rt") as tzfile:
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data = tzfile.read()
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etctz = data.strip('/ \t\r\n')
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if not etctz:
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# Empty file, skip
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continue
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for etctz in etctz.splitlines():
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# Get rid of host definitions and comments:
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if " " in etctz:
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etctz, dummy = etctz.split(" ", 1)
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if "#" in etctz:
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etctz, dummy = etctz.split("#", 1)
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if not etctz:
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continue
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found_configs[tzpath] = etctz.replace(" ", "_")
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except (IOError, UnicodeDecodeError):
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# File doesn't exist or is a directory, or it's a binary file.
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continue
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# CentOS has a ZONE setting in /etc/sysconfig/clock,
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# OpenSUSE has a TIMEZONE setting in /etc/sysconfig/clock and
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# Gentoo has a TIMEZONE setting in /etc/conf.d/clock
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# We look through these files for a timezone:
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zone_re = re.compile(r"\s*ZONE\s*=\s*\"")
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timezone_re = re.compile(r"\s*TIMEZONE\s*=\s*\"")
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end_re = re.compile('"')
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for filename in ("etc/sysconfig/clock", "etc/conf.d/clock"):
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tzpath = os.path.join(_root, filename)
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try:
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with open(tzpath, "rt") as tzfile:
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data = tzfile.readlines()
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for line in data:
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# Look for the ZONE= setting.
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match = zone_re.match(line)
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if match is None:
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# No ZONE= setting. Look for the TIMEZONE= setting.
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match = timezone_re.match(line)
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if match is not None:
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# Some setting existed
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line = line[match.end():]
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etctz = line[: end_re.search(line).start()]
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# We found a timezone
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found_configs[tzpath] = etctz.replace(" ", "_")
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except (IOError, UnicodeDecodeError):
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# UnicodeDecode handles when clock is symlink to /etc/localtime
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continue
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# systemd distributions use symlinks that include the zone name,
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# see manpage of localtime(5) and timedatectl(1)
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tzpath = os.path.join(_root, "etc/localtime")
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if os.path.exists(tzpath) and os.path.islink(tzpath):
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etctz = realtzpath = os.path.realpath(tzpath)
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start = etctz.find("/") + 1
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while start != 0:
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etctz = etctz[start:]
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try:
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pds.timezone(etctz)
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tzinfo = f"{tzpath} is a symlink to"
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found_configs[tzinfo] = etctz.replace(" ", "_")
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except pds.UnknownTimeZoneError:
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pass
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start = etctz.find("/") + 1
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if len(found_configs) > 0:
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# We found some explicit config of some sort!
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if len(found_configs) > 1:
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# Uh-oh, multiple configs. See if they match:
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unique_tzs = set()
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zoneinfo = os.path.join(_root, "usr", "share", "zoneinfo")
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directory_depth = len(zoneinfo.split(os.path.sep))
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for tzname in found_configs.values():
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# Look them up in /usr/share/zoneinfo, and find what they
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# really point to:
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path = os.path.realpath(os.path.join(zoneinfo, *tzname.split("/")))
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real_zone_name = "/".join(path.split(os.path.sep)[directory_depth:])
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unique_tzs.add(real_zone_name)
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if len(unique_tzs) != 1:
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message = "Multiple conflicting time zone configurations found:\n"
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for key, value in found_configs.items():
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message += f"{key}: {value}\n"
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message += "Fix the configuration, or set the time zone in a TZ environment variable.\n"
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raise utils.ZoneInfoNotFoundError(message)
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# We found exactly one config! Use it.
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return list(found_configs.values())[0]
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def _get_localzone(_root="/"):
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"""Creates a timezone object from the timezone name.
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If there is no timezone config, it will try to create a file from the
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localtime timezone, and if there isn't one, it will default to UTC.
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The parameter _root makes the function look for files like /etc/localtime
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beneath the _root directory. This is primarily used by the tests.
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In normal usage you call the function without parameters."""
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# First try the ENV setting.
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tzenv = utils._tz_from_env()
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if tzenv:
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return tzenv
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tzname = _get_localzone_name(_root)
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if tzname is None:
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# No explicit setting existed. Use localtime
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for filename in ("etc/localtime", "usr/local/etc/localtime"):
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tzpath = os.path.join(_root, filename)
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if not os.path.exists(tzpath):
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continue
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with open(tzpath, "rb") as tzfile:
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tz = pds.wrap_zone(ZoneInfo.from_file(tzfile, key="local"))
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break
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else:
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warnings.warn("Can not find any timezone configuration, defaulting to UTC.")
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tz = timezone.utc
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else:
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tz = pds.timezone(tzname)
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if _root == "/":
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# We are using a file in etc to name the timezone.
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# Verify that the timezone specified there is actually used:
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utils.assert_tz_offset(tz)
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return tz
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def get_localzone_name():
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"""Get the computers configured local timezone name, if any."""
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global _cache_tz_name
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if _cache_tz_name is None:
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_cache_tz_name = _get_localzone_name()
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return _cache_tz_name
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def get_localzone():
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"""Get the computers configured local timezone, if any."""
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global _cache_tz
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if _cache_tz is None:
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_cache_tz = _get_localzone()
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return _cache_tz
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def reload_localzone():
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"""Reload the cached localzone. You need to call this if the timezone has changed."""
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global _cache_tz_name
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global _cache_tz
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_cache_tz_name = _get_localzone_name()
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_cache_tz = _get_localzone()
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return _cache_tz
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