pmsetdate

   1 #!/usr/bin/env perl
   2
   3 #=======================================================================
   4 # pmsetdate
   5 # File ID: c524eb1a-f743-11dd-9167-000475e441b9
   6 # [Description]
   7 #
   8 # Character set: UTF-8
   9 # ©opyleft 2008– Øyvind A. Holm <sunny@sunbase.org>
  10 # License: GNU General Public License version 2 or later, see end of
  11 # file for legal stuff.
  12 #=======================================================================
  13
  14 use strict;
  15 use warnings;
  16 use Getopt::Long;
  17 use Time::HiRes qw{ gettimeofday };
  18
  19 $| = 1;
  20
  21 our $Debug = 0;
  22
  23 our %Opt = (
  24
  25     'debug' => 0,
  26     'help' => 0,
  27     'verbose' => 0,
  28     'version' => 0,
  29
  30 );
  31
  32 our $progname = $0;
  33 $progname =~ s/^.*\/(.*?)$/$1/;
  34 our $VERSION = "0.00";
  35
  36 Getopt::Long::Configure("bundling");
  37 GetOptions(
  38
  39     "debug" => \$Opt{'debug'},
  40     "help|h" => \$Opt{'help'},
  41     "verbose|v+" => \$Opt{'verbose'},
  42     "version" => \$Opt{'version'},
  43
  44 ) || die("$progname: Option error. Use -h for help.\n");
  45
  46 $Opt{'debug'} && ($Debug = 1);
  47 $Opt{'help'} && usage(0);
  48 if ($Opt{'version'}) {
  49     print_version();
  50     exit(0);
  51 }
  52
  53 chomp(my $server_text = `ntpdate -q pool.ntp.org`);
  54
  55 D("=== server_diff \x7B\x7B\x7B\n$server_text=== \x7D\x7D\x7D");
  56
  57 my $server_diff = $server_text;
  58 D("server_diff = '$server_diff'");
  59
  60 $server_diff =~ s/^\s*(.*?)\s*$/$1/s;
  61 $server_diff =~ s/^.*?(\S+) sec$/$1/s;
  62 D("server_diff = '$server_diff'");
  63
  64 my $currtime = gettimeofday();
  65 D("currtime = '$currtime'");
  66
  67 my $newtime = $currtime + $server_diff;
  68 my $time_text = localtime($newtime);
  69
  70 D("newtime = '$newtime'");
  71 my $cmd_str = "date -s \"$time_text\"";
  72 D("cmd_str = '$cmd_str'");
  73
  74 printf("Old date: " . localtime(gettimeofday) . "\n");
  75 system($cmd_str);
  76 printf("New date: " . localtime(gettimeofday) . "\n");
  77
  78 sub print_version {
  79     # Print program version {{{
  80     print("$progname v$VERSION\n");
  81     # }}}
  82 } # print_version()
  83
  84 sub usage {
  85     # Send the help message to stdout {{{
  86     my $Retval = shift;
  87
  88     if ($Opt{'verbose'}) {
  89         print("\n");
  90         print_version();
  91     }
  92     print(<<END);
  93
  94 Usage: $progname [options] [file [files [...]]]
  95
  96 Options:
  97
  98   -h, --help
  99     Show this help.
 100   -v, --verbose
 101     Increase level of verbosity. Can be repeated.
 102   --version
 103     Print version information.
 104   --debug
 105     Print debugging messages.
 106
 107 END
 108     exit($Retval);
 109     # }}}
 110 } # usage()
 111
 112 sub msg {
 113     # Print a status message to stderr based on verbosity level {{{
 114     my ($verbose_level, $Txt) = @_;
 115
 116     if ($Opt{'verbose'} >= $verbose_level) {
 117         print(STDERR "$progname: $Txt\n");
 118     }
 119     # }}}
 120 } # msg()
 121
 122 sub D {
 123     # Print a debugging message {{{
 124     $Debug || return;
 125     my @call_info = caller;
 126     chomp(my $Txt = shift);
 127     my $File = $call_info[1];
 128     $File =~ s#\\#/#g;
 129     $File =~ s#^.*/(.*?)$#$1#;
 130     print(STDERR "$File:$call_info[2] $$ $Txt\n");
 131     return("");
 132     # }}}
 133 } # D()
 134
 135 __END__
 136
 137 # Plain Old Documentation (POD) {{{
 138
 139 =pod
 140
 141 =head1 NAME
 142
 143
 144
 145 =head1 SYNOPSIS
 146
 147  [options] [file [files [...]]]
 148
 149 =head1 DESCRIPTION
 150
 151
 152
 153 =head1 OPTIONS
 154
 155 =over 4
 156
 157 =item B<-h>, B<--help>
 158
 159 Print a brief help summary.
 160
 161 =item B<-v>, B<--verbose>
 162
 163 Increase level of verbosity. Can be repeated.
 164
 165 =item B<--version>
 166
 167 Print version information.
 168
 169 =item B<--debug>
 170
 171 Print debugging messages.
 172
 173 =back
 174
 175 =head1 BUGS
 176
 177
 178
 179 =head1 AUTHOR
 180
 181 Made by Øyvind A. Holm S<E<lt>sunny@sunbase.orgE<gt>>.
 182
 183 =head1 COPYRIGHT
 184
 185 Copyleft © Øyvind A. Holm E<lt>sunny@sunbase.orgE<gt>
 186 This is free software; see the file F<COPYING> for legalese stuff.
 187
 188 =head1 LICENCE
 189
 190 This program is free software: you can redistribute it and/or modify it
 191 under the terms of the GNU General Public License as published by the
 192 Free Software Foundation, either version 2 of the License, or (at your
 193 option) any later version.
 194
 195 This program is distributed in the hope that it will be useful, but
 196 WITHOUT ANY WARRANTY; without even the implied warranty of
 197 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 198 See the GNU General Public License for more details.
 199
 200 You should have received a copy of the GNU General Public License along
 201 with this program.
 202 If not, see L<http://www.gnu.org/licenses/>.
 203
 204 =head1 SEE ALSO
 205
 206 =cut
 207
 208 # }}}
 209
 210 # vim: set fenc=UTF-8 ft=perl fdm=marker ts=4 sw=4 sts=4 et fo+=w :