Current File : //proc/self/root/usr/share/perl5/vendor_perl/DateTime/TimeZone/Local/Unix.pm
package DateTime::TimeZone::Local::Unix;
$DateTime::TimeZone::Local::Unix::VERSION = '1.70';
use strict;
use warnings;
use Cwd 3;
use parent 'DateTime::TimeZone::Local';
sub Methods {
return qw(
FromEnv
FromEtcLocaltime
FromEtcTimezone
FromEtcTIMEZONE
FromEtcSysconfigClock
FromEtcDefaultInit
);
}
sub EnvVars { return 'TZ' }
our $EtcDir = '/etc';
sub _EtcFile {
shift;
return File::Spec->catfile( $EtcDir, @_ );
}
sub FromEtcLocaltime {
my $class = shift;
my $lt_file = $class->_EtcFile('localtime');
return unless -r $lt_file && -s _;
my $real_name;
if ( -l $lt_file ) {
# The _Readlink sub exists so the test suite can mock it.
$real_name = $class->_Readlink($lt_file);
}
$real_name ||= $class->_FindMatchingZoneinfoFile($lt_file);
if ( defined $real_name ) {
my ( $vol, $dirs, $file ) = File::Spec->splitpath($real_name);
my @parts
= grep { defined && length } File::Spec->splitdir($dirs), $file;
foreach my $x ( reverse 0 .. $#parts ) {
my $name = (
$x < $#parts
? join '/', @parts[ $x .. $#parts ]
: $parts[$x]
);
my $tz;
{
local $@;
local $SIG{__DIE__};
$tz = eval { DateTime::TimeZone->new( name => $name ) };
}
return $tz if $tz;
}
}
}
sub _Readlink {
my $link = $_[1];
# Using abs_path will resolve multiple levels of link indirection,
# whereas readlink just follows the link to the next target.
return Cwd::abs_path($link);
}
our $ZoneinfoDir = '/usr/share/zoneinfo';
# for systems where /etc/localtime is a copy of a zoneinfo file
sub _FindMatchingZoneinfoFile {
my $class = shift;
my $file_to_match = shift;
return unless -d $ZoneinfoDir;
require File::Basename;
require File::Compare;
require File::Find;
my $size = -s $file_to_match;
my $real_name;
local $@;
local $SIG{__DIE__};
local $_;
eval {
File::Find::find(
{
wanted => sub {
if (
!defined $real_name
&& -f $_
&& !-l $_
&& $size == -s _
# This fixes RT 24026 - apparently such a
# file exists on FreeBSD and it can cause a
# false positive
&& File::Basename::basename($_) ne 'posixrules'
&& File::Compare::compare( $_, $file_to_match ) == 0
) {
$real_name = $_;
# File::Find has no mechanism for bailing in the
# middle of a find.
die { found => 1 };
}
},
no_chdir => 1,
},
$ZoneinfoDir,
);
};
if ($@) {
return $real_name if ref $@ && $@->{found};
die $@;
}
}
sub FromEtcTimezone {
my $class = shift;
my $tz_file = $class->_EtcFile('timezone');
return unless -f $tz_file && -r _;
open my $fh, '<', $tz_file
or die "Cannot read $tz_file: $!";
my $name = join '', <$fh>;
close $fh;
$name =~ s/^\s+|\s+$//g;
return unless $class->_IsValidName($name);
local $@;
local $SIG{__DIE__};
return eval { DateTime::TimeZone->new( name => $name ) };
}
sub FromEtcTIMEZONE {
my $class = shift;
my $tz_file = $class->_EtcFile('TIMEZONE');
return unless -f $tz_file && -r _;
open my $fh, '<', $tz_file
or die "Cannot read $tz_file: $!";
my $name;
while ( defined( $name = <$fh> ) ) {
if ( $name =~ /\A\s*TZ\s*=\s*(\S+)/ ) {
$name = $1;
last;
}
}
close $fh;
return unless $class->_IsValidName($name);
local $@;
local $SIG{__DIE__};
return eval { DateTime::TimeZone->new( name => $name ) };
}
# RedHat uses this
sub FromEtcSysconfigClock {
my $class = shift;
my $clock_file = $class->_EtcFile('sysconfig/clock');
return unless -r $clock_file && -f _;
my $name = $class->_ReadEtcSysconfigClock();
return unless $class->_IsValidName($name);
local $@;
local $SIG{__DIE__};
return eval { DateTime::TimeZone->new( name => $name ) };
}
# this is a separate function so that it can be overridden in the test suite
sub _ReadEtcSysconfigClock {
my $class = shift;
my $clock_file = shift;
open my $fh, '<', $clock_file
or die "Cannot read $clock_file: $!";
local $_;
while (<$fh>) {
return $1 if /^(?:TIME)?ZONE="([^"]+)"/;
}
}
sub FromEtcDefaultInit {
my $class = shift;
my $init_file = $class->_EtcFile('default/init');
return unless -r $init_file && -f _;
my $name = $class->_ReadEtcDefaultInit($init_file);
return unless $class->_IsValidName($name);
local $@;
local $SIG{__DIE__};
return eval { DateTime::TimeZone->new( name => $name ) };
}
# this is a separate function so that it can be overridden in the test
# suite
sub _ReadEtcDefaultInit {
my $class = shift;
my $init_file = shift;
open my $fh, '<', $init_file
or die "Cannot read $init_file: $!";
local $_;
while (<$fh>) {
return $1 if /^TZ=(.+)/;
}
}
1;
# ABSTRACT: Determine the local system's time zone on Unix
__END__
=pod
=encoding UTF-8
=head1 NAME
DateTime::TimeZone::Local::Unix - Determine the local system's time zone on Unix
=head1 VERSION
version 1.70
=head1 SYNOPSIS
my $tz = DateTime::TimeZone->new( name => 'local' );
my $tz = DateTime::TimeZone::Local->TimeZone();
=head1 DESCRIPTION
This module provides methods for determining the local time zone on a
Unix platform.
=head1 HOW THE TIME ZONE IS DETERMINED
This class tries the following methods of determining the local time
zone:
=over 4
=item * $ENV{TZ}
It checks C<< $ENV{TZ} >> for a valid time zone name.
=item * F</etc/localtime>
If this file is a symlink to an Olson database time zone file (usually
in F</usr/share/zoneinfo>) then it uses the target file's path name to
determine the time zone name. For example, if the path is
F</usr/share/zoneinfo/America/Chicago>, the time zone is
"America/Chicago".
Some systems just copy the relevant file to F</etc/localtime> instead
of making a symlink. In this case, we look in F</usr/share/zoneinfo>
for a file that has the same size and content as F</etc/localtime> to
determine the local time zone.
=item * F</etc/timezone>
If this file exists, it is read and its contents are used as a time
zone name.
=item * F</etc/TIMEZONE>
If this file exists, it is opened and we look for a line starting like
"TZ = ...". If this is found, it should indicate a time zone name.
=item * F</etc/sysconfig/clock>
If this file exists, it is opened and we look for a line starting like
"TIMEZONE = ..." or "ZONE = ...". If this is found, it should indicate
a time zone name.
=item * F</etc/default/init>
If this file exists, it is opened and we look for a line starting like
"TZ=...". If this is found, it should indicate a time zone name.
=back
=head1 AUTHOR
Dave Rolsky <autarch@urth.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2014 by Dave Rolsky.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=cut
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