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"""Unix support for tzlocal."""
import os
import re
import dateutil.tz
_cache_tz = None
def _try_tz_from_env():
tzenv = os.environ.get("TZ")
if tzenv and tzenv[0] == ":":
tzenv = tzenv[1:]
try:
if tzenv:
dateutil.tz.gettz(tzenv)
return tzenv
except Exception:
pass
def _get_localzone(_root="/"):
"""Try to find the local timezone configuration.
The parameter _root makes the function look for files like /etc/localtime
beneath the _root directory. This is primarily used by the tests.
In normal usage you call the function without parameters.
"""
tzenv = _try_tz_from_env()
if tzenv:
return tzenv
# Are we under Termux on Android?
if os.path.exists("/system/bin/getprop"):
import subprocess
androidtz = (
subprocess.check_output(["getprop", "persist.sys.timezone"])
.strip()
.decode()
)
return androidtz
# Now look for distribution specific configuration files
# that contain the timezone name.
for configfile in ("etc/timezone", "var/db/zoneinfo"):
tzpath = os.path.join(_root, configfile)
try:
with open(tzpath, "rb") as tzfile:
data = tzfile.read()
# Issue #3 was that /etc/timezone was a zoneinfo file.
# That's a misconfiguration, but we need to handle it gracefully:
if data[:5] == b"TZif2":
continue
etctz = data.strip().decode()
if not etctz:
# Empty file, skip
continue
for etctz in data.decode().splitlines():
# Get rid of host definitions and comments:
if " " in etctz:
etctz, dummy = etctz.split(" ", 1)
if "#" in etctz:
etctz, dummy = etctz.split("#", 1)
if not etctz:
continue
tz = etctz.replace(" ", "_")
return tz
except IOError:
# File doesn't exist or is a directory
continue
# CentOS has a ZONE setting in /etc/sysconfig/clock,
# OpenSUSE has a TIMEZONE setting in /etc/sysconfig/clock and
# Gentoo has a TIMEZONE setting in /etc/conf.d/clock
# We look through these files for a timezone:
zone_re = re.compile(r"\s*ZONE\s*=\s*\"")
timezone_re = re.compile(r"\s*TIMEZONE\s*=\s*\"")
end_re = re.compile('"')
for filename in ("etc/sysconfig/clock", "etc/conf.d/clock"):
tzpath = os.path.join(_root, filename)
try:
with open(tzpath, "rt") as tzfile:
data = tzfile.readlines()
for line in data:
# Look for the ZONE= setting.
match = zone_re.match(line)
if match is None:
# No ZONE= setting. Look for the TIMEZONE= setting.
match = timezone_re.match(line)
if match is not None:
# Some setting existed
line = line[match.end():]
etctz = line[: end_re.search(line).start()]
# We found a timezone
tz = etctz.replace(" ", "_")
return tz
except IOError:
# File doesn't exist or is a directory
continue
# systemd distributions use symlinks that include the zone name,
# see manpage of localtime(5) and timedatectl(1)
tzpath = os.path.join(_root, "etc/localtime")
if os.path.exists(tzpath) and os.path.islink(tzpath):
tzpath = os.path.realpath(tzpath)
start = tzpath.find("/") + 1
while start != 0:
tzpath = tzpath[start:]
try:
tested_tz = dateutil.tz.gettz(tzpath)
if tested_tz:
return tzpath
except Exception:
pass
start = tzpath.find("/") + 1
# Nothing found, return UTC
return None
def get_localzone():
"""Get the computers configured local timezone, if any."""
global _cache_tz
if _cache_tz is None:
_cache_tz = _get_localzone()
return _cache_tz
def reload_localzone():
"""Reload the cached localzone. You need to call this if the timezone has changed."""
global _cache_tz
_cache_tz = _get_localzone()
return _cache_tz
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