#!/usr/bin/perl

=head1 NAME

xmc - Xen Control script

=head1 SYNOPSIS

    xmc [CMD] [domain-name]
    
        CMD           is one of the: ls, create, shutdown, save, restore
        domain-name   is optional and is not set command wil apply to all domains

=head1 DESCRIPTION

`xmc` script is helper script arround `xm` Xen management user control. The
difference is that it applies the commands to all domains if the domain
name is not specified explicitely. For example `xmc save` will suspend
all running Xen machines.

'save', 'restore' functions will by default save/restore the state file
to/from '/var/tmp'. The file name will be constructed from the domain name
and extension '.xen' will be added. Thus you don't have to specify state 
file name.

'create' will start domain either from state file if present or by starting
the machine by `xm create domain-name.cfg`.

The main benefit to `xm` usage is to be able to save/hibernate all machines by
a single command and then later by one command either to restore/wakeup or
"power on" the virtual machines.

=cut

use strict;
use warnings;

use Getopt::Long;
use Pod::Usage;

use List::MoreUtils 'none';
use Xen::Control;

our @AVAILABLE_CMDS = qw(
    ls
    list
    create
    shutdown
    save
    restore
);

exit main();

sub main {
    my $help;
    GetOptions(
        'help|h' => \$help,
    ) or pod2usage;
    
    my $cmd         = lc shift @ARGV,
    my $domain_name = shift @ARGV;
    
    pod2usage
        if $help or !$cmd;
    
    pod2usage if none { $cmd eq $_ } @AVAILABLE_CMDS;
    
    my $xen = Xen::Control->new();
    
    if (($cmd eq 'ls') or ($cmd eq 'list')) {
        print $xen->xm('list');
    }
    else {
        $xen->$cmd($domain_name);
    }
    
    return 0;
}


__END__


=head1 SEE ALSO

    perldoc Xen::Control

=head1 AUTHOR

Jozef Kutej

=cut