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daemon.pl
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daemon.pl
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#!/usr/bin/env perl
use strict;
use warnings;
use Proc::Daemon;
use Cwd;
use Pod::Usage;
use Carp;
use Perl6::Slurp;
=pod
=head1 SYNOPSIS
C<< daemon [-di|--dir <working directory> [-u|--user <user>] [-g|--group <group> [-stat|-stop|-restart] [-t|--test] >>
This script starts cfbot.pl as a daemon for normal use.
=head1 AUTHOR
Neil H. Watson, http://watson-wilson.ca, C<< <neil@watson-wilson.ca> >>
=head1 LICENSE AND COPYRIGHT
Copyright (C) 2015 Neil H. Watson
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
=cut
sub _get_cli_args {
my @args = @_;
use Getopt::Long qw/GetOptionsFromArray/;
use Cwd;
# Set default CLI args here. Getopts will override.
my %arg = (
dir => '/home/cfbot/cfbot',
user => 'cfbot',
group => 'cfbot',
);
GetOptionsFromArray
(
\@args,
\%arg,
'help|?',
'version',
'start',
'stop',
'restart',
'test',
'dir:s',
'user:s',
'group:s',
)
or eval
{
usage( 'USAGE' );
exit 1;
};
# Protect input.
unless ( $arg{dir} =~ m|\A[a-z0-9_./-]+\Z|i ) {
usage( "Tainted dir argument" );
exit 1;
}
return \%arg;
}
sub usage {
my $msg = shift;
my $section;
if ( $msg =~ m/\AEXAMPLES\Z/ )
{
$section = $msg;
}
else
{
$section = "SYNOPSIS";
}
pod2usage(
-verbose => 99,
-sections => "$section",
-msg => $msg
);
return;
}
my $args = _get_cli_args( @ARGV );
if ( $args->{help} ) {
usage( 'HELP' );
exit;
}
=pod
elsif ( $args->{version} ) {
say $VERSION;
exit;
}
=cut
# Protect input
if ( $args->{user} eq 'root' ) {
croak "User cannot be root";
}
if ( $args->{group} eq 'root' ) {
croak "Group cannot be root";
}
#my $args->{dir} = getcwd();
my $pid_file = $args->{dir}."/cfbot.pid";
my $uid = getpwnam( $args->{user} );
my $gid = getgrnam( $args->{group} );
my $exec_command = $args->{dir}."/cfbot.pm";
if ( $args->{test} ){
$exec_command .= ' --test';
}
my $d = Proc::Daemon->new(
work_dir => $args->{dir},
pid_file => $pid_file,
exec_command => $exec_command,
setuid => $uid,
setgid => $gid,
);
my $exit = 0;
if ( $args->{start} ) {
$exit += start();
}
elsif ( $args->{stop} ) {
$exit += stop();
}
elsif ( $args->{restart} ) {
stop();
$exit += start();
}
else {
usage( 'USAGE' );
exit 1;
}
sub start {
my $pid = $d->Init();
return kill 0, $pid;
}
sub stop {
my $pid = slurp $pid_file;
unlink $pid_file;
return kill 'TERM', $pid;
}
sub status {
my $file = shift;
if ( -e $file ){
my $pid = slurp $pid_file;
return kill 0, $pid;
}
return 0;
}
# TODO figure out return status
exit 0 if $exit > 0;
exit $exit;