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#!/usr/local/bin/perl -w
#-*- perl -*-
#
# Copyright (C) 2000-2001 Ken'ichi Fukamachi
# All rights reserved.
#
# $Id: loader,v 1.2 2001/01/29 03:23:41 fukachan Exp $
# $FML$
#
eval 'exec /usr/local/bin/perl -S $0 ${1+"$@"}'
if $running_under_some_shell;
use vars qw($MainCF $running_under_some_shell);
use strict;
use Carp;
use Getopt::Long;
# main configuration file for directory switch
$MainCF = '/etc/fml/main.cf';
eval { &Bootstrap();};
if ($@) { print STDERR "Error: ", $@, "\n"; exit 1;}
exit 0;
# Firstly we load Standalone.pm which has main.cf parser().
BEGIN {
use File::Basename;
unshift(@INC, dirname($0));
require Standalone;
}
# Descriptions: top lebel bootstrap program
# which load a dispather program (process_switch)
# for process switch. The flow of execution follows:
# libexec/loader ->
# libexec/process_switch ->
# FML::Process::Something
# Arguments: none
# XXX this program sees $0
# (program name, == argv[0] of C language)
# Side Effects: switch to the real process
# Return Value: none
sub Bootstrap
{
# 1. main.cf exists and I can open it?
-f $MainCF || die("cannot find ${MainCF}");
my $fh = new FileHandle $MainCF;
defined($fh) || die("cannot find ${MainCF}");
# 2. pick up *.cf files to read and set them to @cf.
# We pass it to fml_loader.
# pass *.cf files to libexec/{distribute,command}
# for example
# @cf = ( /etc/fml/defaults/$VERSION/default_config.cf
# /etc/fml/domains/$DOMAIN/config.cf
# /var/spool/ml/elena/config.cf
# );
my @cf = ();
my %options = ();
my $my_default_config = '';
my $ml_home_dir = ''; # e.g. /var/spool/ml/elena
GetOptions(\%options,
qw(ctladdr! debug! params=s -c=s)
);
for (@ARGV) {
if (-d $_) {
$ml_home_dir = $_;
push(@cf, "$_/config.cf") if -f "$_/config.cf";
}
elsif (-f $_) {
push(@cf, $_);
}
}
# 2.1 o.k. try to load main.cf
my $main_cf = Standalone::load_cf($options{'c'} || $MainCF,
$options{'params'}
);
my $libexec_dir = $main_cf->{ libexec_dir };
my $default_config = $my_default_config || $main_cf->{ default_config };
unshift(@cf, $default_config);
# 3. reset @INC
unshift(@INC, split(/\s+/, $main_cf->{ lib_dir }));
unshift(@INC, split(/\s+/, $main_cf->{ local_lib_dir }));
# 4. inspect my mode from $0
use File::Basename;
my $myname = basename($0);
# debug;
if ($0 =~ /loader/) {
use Data::Dumper; print Dumper( $main_cf ); sleep 3;
}
# 5. o.k. here we go!
if (-f "$libexec_dir/process_switch") {
my ($args, $pkg);
$args = {
fml_version => $main_cf->{ fml_version },
myname => $myname,
ml_home_prefix => $main_cf->{ ml_home_prefix },
ml_home_dir => $ml_home_dir,
cf_list => \@cf,
options => \%options,
};
# See libexec/process_switch on ProcessSwitch()
require "$libexec_dir/process_switch";
$pkg = ProcessSwitch($args);
# See FML::Process::Kernel module on ProcessStart()
ProcessStart($pkg, $args);
}
else {
croak("$libexec_dir/fml is not found.");
}
}
=head1 NAME
loader -- the wrapper which executes a real fml5 program.
=head1 SYNOPSIS
loader C<[-c main.cf]> C<[--debug]> C<[--ctladdr]> [ml_home_dir]
=head1 DESCRIPTION
The loader resolves fml version dependence.
It checks /etc/fml/main.cf and prepare @INC for some fml version.
The real process switch routine is dependent on fml version.
C<libexec/fml/loader> switches itself to a program specified by $0.
C<libexec/fml/$VERSION/process_switch> analyzes several conditions
specified by main.cf, @INC and $0 et. al.
The swithing is done in libexec/fml/$VERSION/process_switch.
See C<libexec/fml/$VERSION/process_switch> for more details on process
switching.
C<-c main.cf>
main.cf alternative
C<--debug>
debug on.
C<--ctladdr>
execute fml/libexec/command.
C<--params>
--params 'key1=value1 key2=value2 ...'
=cut
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