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# Functions for getting and setting the timezone on Linux
use strict;
use warnings;
our $timezone_file = "/etc/TIMEZONE";
our $timezones_dir = "/usr/share/lib/zoneinfo";
our $rtc_config = "/etc/rtc_config";
# list_timezones()
sub list_timezones
{
my @rv;
my $file;
my $fh = "FIND";
&open_execute_command($fh, "find $timezones_dir -type f", 1);
while($file = <$fh>) {
chop($file);
my $buf;
my $fh2 = "INFO";
&open_readfile($fh2, $file);
read($fh2, $buf, 2);
close($fh2);
if ($buf eq "TZ") {
# A timezone file we can use!
$file =~ s/^$timezones_dir\///;
push(@rv, [ $file, undef ]);
}
}
close($fh);
return sort { $a->[0] cmp $b->[0] } @rv;
}
# get_current_timezone()
sub get_current_timezone
{
my %tz;
&read_env_file($timezone_file, \%tz);
$tz{'TZ'} =~ s/^://;
return $tz{'TZ'};
}
# set_current_timezone(zone)
sub set_current_timezone
{
my %tz;
&lock_file($timezone_file);
&read_env_file($timezone_file, \%tz);
$tz{'TZ'} = $_[0];
&write_env_file($timezone_file, \%tz);
&unlock_file($timezone_file);
if (-r $rtc_config) {
# Update x86 RTC timezone too
&lock_file($rtc_config);
my %rtc;
&read_env_file($rtc_config, \%rtc);
$rtc{'zone_info'} = $_[0];
&write_env_file($rtc_config, \%rtc);
&unlock_file($rtc_config);
}
}
sub os_has_timezones
{
return -r $timezone_file && -d $timezones_dir;
}
sub timezone_files
{
return ( $timezone_file );
}
1;
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