/usr/share/perl5/DateTime/TimeZone/Local.pm is in libdatetime-timezone-perl 1:2.09-1+2018i.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 | package DateTime::TimeZone::Local;
use strict;
use warnings;
use namespace::autoclean;
our $VERSION = '2.09';
use DateTime::TimeZone;
use File::Spec;
use Module::Runtime qw( require_module );
use Try::Tiny;
sub TimeZone {
my $class = shift;
my $subclass = $class->_load_subclass();
for my $meth ( $subclass->Methods() ) {
my $tz = $subclass->$meth();
return $tz if $tz;
}
die "Cannot determine local time zone\n";
}
{
# Stolen from File::Spec. My theory is that other folks can write
# the non-existent modules if they feel a need, and release them
# to CPAN separately.
my %subclass = (
MSWin32 => 'Win32',
VMS => 'VMS',
MacOS => 'Mac',
os2 => 'OS2',
epoc => 'Epoc',
NetWare => 'Win32',
symbian => 'Win32',
dos => 'OS2',
android => 'Android',
cygwin => 'Unix',
);
sub _load_subclass {
my $class = shift;
my $os_name = $subclass{$^O} || $^O;
my $subclass = $class . '::' . $os_name;
return $subclass if $subclass->can('Methods');
return $subclass if try {
## no critic (Variables::RequireInitializationForLocalVars)
local $SIG{__DIE__};
require_module($subclass);
};
$subclass = $class . '::Unix';
require_module($subclass);
return $subclass;
}
}
sub FromEnv {
my $class = shift;
foreach my $var ( $class->EnvVars() ) {
if ( $class->_IsValidName( $ENV{$var} ) ) {
my $tz = try {
## no critic (Variables::RequireInitializationForLocalVars)
local $SIG{__DIE__};
DateTime::TimeZone->new( name => $ENV{$var} );
};
return $tz if $tz;
}
}
return;
}
sub _IsValidName {
shift;
return 0 unless defined $_[0];
return 0 if $_[0] eq 'local';
return $_[0] =~ m{^[\w/\-\+]+$};
}
1;
# ABSTRACT: Determine the local system's time zone
__END__
=pod
=encoding UTF-8
=head1 NAME
DateTime::TimeZone::Local - Determine the local system's time zone
=head1 VERSION
version 2.09
=head1 SYNOPSIS
my $tz = DateTime::TimeZone->new( name => 'local' );
my $tz = DateTime::TimeZone::Local->TimeZone();
=head1 DESCRIPTION
This module provides an interface for determining the local system's
time zone. Most of the functionality for doing this is in OS-specific
subclasses.
=head1 USAGE
This class provides the following methods:
=head2 DateTime::TimeZone::Local->TimeZone()
This attempts to load an appropriate subclass and asks it to find the
local time zone. This method is called by when you pass "local" as the
time zone name to C<< DateTime:TimeZone->new() >>.
If your OS is not explicitly handled, you can create a module with a
name of the form C<DateTime::TimeZone::Local::$^O>. If it exists, it
will be used instead of falling back to the Unix subclass.
If no OS-specific module exists, we fall back to using the Unix
subclass.
See L<DateTime::TimeZone::Local::Unix>,
L<DateTime::TimeZone::Local::Win32>, and
L<DateTime::TimeZone::Local::VMS> for OS-specific details.
=head1 SUBCLASSING
If you want to make a new OS-specific subclass, there are several
methods provided by this module you should know about.
=head2 $class->Methods()
This method should be provided by your class. It should provide a list
of methods that will be called to try to determine the local time
zone.
Each of these methods is expected to return a new
C<DateTime::TimeZone> object if it determines the time zone.
=head2 $class->FromEnv()
This method tries to find a valid time zone in an C<%ENV> value. It
calls C<< $class->EnvVars() >> to determine which keys to look at.
To use this from a subclass, simply return "FromEnv" as one of the
items from C<< $class->Methods() >>.
=head2 $class->EnvVars()
This method should be provided by your subclass. It should return a
list of env vars to be checked by C<< $class->FromEnv() >>.
=head2 $class->_IsValidName($name)
Given a possible time zone name, this returns a boolean indicating
whether or not the name looks valid. It always return false for
"local" in order to avoid infinite loops.
=head1 EXAMPLE SUBCLASS
Here is a simple example subclass:
package DateTime::TimeZone::SomeOS;
use strict;
use warnings;
use base 'DateTime::TimeZone::Local';
sub Methods { qw( FromEnv FromEther ) }
sub EnvVars { qw( TZ ZONE ) }
sub FromEther
{
my $class = shift;
...
}
=head1 SUPPORT
Bugs may be submitted through L<https://github.com/houseabsolute/DateTime-TimeZone/issues>.
I am also usually active on IRC as 'autarch' on C<irc://irc.perl.org>.
=head1 AUTHOR
Dave Rolsky <autarch@urth.org>
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2016 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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