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225 lines
6.4 KiB
225 lines
6.4 KiB
#
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# Copyright (C) 2012 Red Hat, Inc.
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#
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# This copyrighted material is made available to anyone wishing to use,
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# modify, copy, or redistribute it subject to the terms and conditions of
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# the GNU General Public License v.2, or (at your option) any later version.
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# This program is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY expressed or implied, including the implied warranties of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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# Public License for more details. You should have received a copy of the
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# GNU General Public License along with this program; if not, write to the
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# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301, USA. Any Red Hat trademarks that are incorporated in the
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# source code or documentation are not subject to the GNU General Public
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# License and may only be used or replicated with the express permission of
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# Red Hat, Inc.
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#
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"""
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Module providing functions for getting the list of timezones, writing timezone
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configuration, valid timezones recognition etc.
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"""
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import os
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import pytz
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import langtable
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from collections import OrderedDict
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from pyanaconda import iutil
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from pyanaconda.constants import THREAD_STORAGE
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from pyanaconda.flags import flags
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from pyanaconda.threads import threadMgr
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from blivet import arch
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import logging
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log = logging.getLogger("anaconda")
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# The following zones are not in pytz.common_timezones and
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# Etc category in pytz.all_timezones includes some more,
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# however confusing ones (like UCT, GMT+0, GMT-0,...)
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ETC_ZONES = ['GMT+1', 'GMT+2', 'GMT+3', 'GMT+4', 'GMT+5', 'GMT+6', 'GMT+7',
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'GMT+8', 'GMT+9', 'GMT+10', 'GMT+11', 'GMT+12',
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'GMT-1', 'GMT-2', 'GMT-3', 'GMT-4', 'GMT-5', 'GMT-6', 'GMT-7',
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'GMT-8', 'GMT-9', 'GMT-10', 'GMT-11', 'GMT-12', 'GMT-13',
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'GMT-14', 'UTC', 'GMT']
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NTP_PACKAGE = "chrony"
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NTP_SERVICE = "chronyd"
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class TimezoneConfigError(Exception):
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"""Exception class for timezone configuration related problems"""
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pass
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def time_initialize(timezone, storage, bootloader):
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"""
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Try to guess if RTC uses UTC time or not, set timezone.isUtc properly and
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set system time from RTC using the UTC guess.
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Guess is done by searching for bootable ntfs devices.
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:param timezone: ksdata.timezone object
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:param storage: blivet.Blivet instance
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:param bootloader: bootloader.Bootloader instance
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"""
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if arch.is_s390():
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# nothing to do on s390(x) were hwclock doesn't exist
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return
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if not timezone.isUtc and not flags.automatedInstall:
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# if set in the kickstart, no magic needed here
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threadMgr.wait(THREAD_STORAGE)
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ntfs_devs = filter(lambda dev: dev.format.name == "ntfs",
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storage.devices)
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timezone.isUtc = not bootloader.has_windows(ntfs_devs)
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cmd = "hwclock"
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args = ["--hctosys"]
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if timezone.isUtc:
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args.append("--utc")
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else:
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args.append("--localtime")
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iutil.execWithRedirect(cmd, args)
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def write_timezone_config(timezone, root):
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"""
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Write timezone configuration for the system specified by root.
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:param timezone: ksdata.timezone object
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:param root: path to the root
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:raise: TimezoneConfigError
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"""
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# we want to create a relative symlink
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tz_file = "/usr/share/zoneinfo/" + timezone.timezone
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rooted_tz_file = os.path.normpath(root + tz_file)
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relative_path = os.path.normpath("../" + tz_file)
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link_path = os.path.normpath(root + "/etc/localtime")
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if not os.access(rooted_tz_file, os.R_OK):
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log.error("Timezone to be linked (%s) doesn't exist", rooted_tz_file)
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else:
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try:
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# os.symlink fails if link_path exists, so try to remove it first
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os.remove(link_path)
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except OSError:
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pass
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try:
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os.symlink(relative_path, link_path)
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except OSError as oserr:
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log.error("Error when symlinking timezone (from %s): %s",
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rooted_tz_file, oserr.strerror)
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if arch.is_s390():
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# there is no HW clock on s390(x)
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return
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try:
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fobj = open(os.path.normpath(root + "/etc/adjtime"), "r")
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lines = fobj.readlines()
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fobj.close()
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except IOError:
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lines = ["0.0 0 0.0\n", "0\n"]
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try:
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with open(os.path.normpath(root + "/etc/adjtime"), "w") as fobj:
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fobj.write(lines[0])
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fobj.write(lines[1])
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if timezone.isUtc:
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fobj.write("UTC\n")
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else:
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fobj.write("LOCAL\n")
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except IOError as ioerr:
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msg = "Error while writing /etc/adjtime file: %s" % ioerr.strerror
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raise TimezoneConfigError(msg)
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def save_hw_clock(timezone):
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"""
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Save system time to HW clock.
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:param timezone: ksdata.timezone object
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"""
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if arch.is_s390():
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return
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cmd = "hwclock"
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args = ["--systohc"]
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if timezone.isUtc:
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args.append("--utc")
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else:
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args.append("--local")
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iutil.execWithRedirect(cmd, args)
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def get_preferred_timezone(territory):
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"""
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Get the preferred timezone for a given territory. Note that this function
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simply returns the first timezone in the list of timezones for a given
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territory.
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:param territory: territory to get preferred timezone for
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:type territory: str
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:return: preferred timezone for the given territory or None if no found
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:rtype: str or None
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"""
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timezones = langtable.list_timezones(territoryId=territory)
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if not timezones:
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return None
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return timezones[0]
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def get_all_regions_and_timezones():
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"""
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Get a dictionary mapping the regions to the list of their timezones.
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:rtype: dict
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"""
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result = OrderedDict()
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for tz in pytz.common_timezones:
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parts = tz.split("/", 1)
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if len(parts) > 1:
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if parts[0] not in result:
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result[parts[0]] = set()
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result[parts[0]].add(parts[1])
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result["Etc"] = set(ETC_ZONES)
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return result
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def is_valid_timezone(timezone):
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"""
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Check if a given string is an existing timezone.
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:type timezone: str
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:rtype: bool
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"""
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etc_zones = ["Etc/" + zone for zone in ETC_ZONES]
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return timezone in pytz.common_timezones + etc_zones
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def get_timezone(timezone):
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"""
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Return a tzinfo object for a given timezone name.
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:param str timezone: the timezone name
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:rtype: datetime.tzinfo
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"""
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return pytz.timezone(timezone)
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