/usr/bin/xen-list-images is in xen-tools 4.2.1-1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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=head1 NAME
xen-list-images - List all the created and configured Xen images.
=head1 SYNOPSIS
xen-list-image [options]
Help Options:
--help Show this scripts help information.
--manual Read this scripts manual.
--version Show the version number and exit.
Testing options:
--test Specify an alternate Xen configuration directory.
=head1 OPTIONS
=over 8
=item B<--help>
Show the scripts help information.
=item B<--manual>
Read the manual.
=item B<--test>
This flag causes the script to load the Xen configuration files from a different directory than the default of B</etc/xen>.
=item B<--version>
Show the version number and exit.
=back
=head1 DESCRIPTION
xen-list-images is a simple script which will display all the
Xen images which have been created.
This works by iterating over all files matching the pattern
/etc/xen/*.cfg which is what the xen-create-image script would
create.
For each instance which has been created we'll display the name,
and then either the IP address configured, or "DHCP" to denote
a dynamic host.
=cut
=head1 TODO
It should be possible to determine the disk(s) used by the images,
and then display their sizes.
=cut
=head1 AUTHORS
Steve Kemp, http://www.steve.org.uk/
Stéphane Jourdois
=cut
=head1 LICENSE
Copyright (c) 2005-2009 by Steve Kemp, (c) 2010 by The Xen-Tools
Development Team. All rights reserved.
This module is free software;
you can redistribute it and/or modify it under
the same terms as Perl itself.
The LICENSE file contains the full text of the license.
=cut
use strict;
use English;
use File::Temp qw/ tempdir /;
use Getopt::Long;
use Pod::Usage;
#
# Configuration options, initially read from the configuration files
# but may be overridden by the command line.
#
# Command line flags *always* take precedence over the configuration file.
#
my %CONFIG;
#
# Default prefix
#
$CONFIG{ 'prefix' } = "/etc/xen";
#
# Release number.
#
my $RELEASE = '4.2.1';
#
# Read the global configuration file if it exists.
#
readConfigurationFile("/etc/xen-tools/xen-tools.conf");
#
# Parse command line arguments, these override the values from the
# configuration file.
#
parseCommandLineArguments();
#
# Read all the xen configuration files.
#
my @instances = findXenInstances();
#
# Now process each instance.
#
my $count = 0;
foreach my $instance (@instances)
{
if ($count) {print "\n";}
displayInstance($instance);
$count += 1;
}
#
# All done.
#
exit;
=begin doc
Read the configuration file specified.
=end doc
=cut
sub readConfigurationFile
{
my ($file) = (@_);
# Don't read the file if it doesn't exist.
return if ( !-e $file );
open( FILE, "<", $file ) or die "Cannot read file '$file' - $!";
while ( defined( my $line = <FILE> ) )
{
chomp $line;
if ( $line =~ s/\\$// )
{
$line .= <FILE>;
redo unless eof(FILE);
}
# Skip lines beginning with comments
next if ( $line =~ /^([ \t]*)\#/ );
# Skip blank lines
next if ( length($line) < 1 );
# Strip trailing comments.
if ( $line =~ /(.*)\#(.*)/ )
{
$line = $1;
}
# Find variable settings
if ( $line =~ /([^=]+)=([^\n]+)/ )
{
my $key = $1;
my $val = $2;
# Strip leading and trailing whitespace.
$key =~ s/^\s+//;
$key =~ s/\s+$//;
$val =~ s/^\s+//;
$val =~ s/\s+$//;
# command expansion?
if ( $val =~ /(.*)`([^`]+)`(.*)/ )
{
# store
my $pre = $1;
my $cmd = $2;
my $post = $3;
# get output
my $output = `$cmd`;
chomp($output);
# build up replacement.
$val = $pre . $output . $post;
}
# Store value.
$CONFIG{ $key } = $val;
}
}
close(FILE);
}
=begin doc
Parse the arguments specified upon the command line.
=end doc
=cut
sub parseCommandLineArguments
{
my $HELP = 0;
my $MANUAL = 0;
my $VERSION = 0;
# Parse options.
#
GetOptions( "test=s", \$CONFIG{ 'prefix' },
"help", \$HELP,
"manual", \$MANUAL,
"version", \$VERSION );
pod2usage(1) if $HELP;
pod2usage( -verbose => 2 ) if $MANUAL;
if ($VERSION)
{
my $REVISION = '$Revision: 1.30 $';
if ( $REVISION =~ /1.([0-9.]+) / )
{
$REVISION = $1;
}
print "xen-list-images release $RELEASE - CVS: $REVISION\n";
exit;
}
}
=begin doc
Return an array containing the names of each xen configuration
file we found.
=end doc
=cut
sub findXenInstances
{
my @found;
foreach my $file ( sort( glob( $CONFIG{ 'prefix' } . "/*.cfg" ) ) )
{
push @found, $file if ( -e $file );
}
return (@found);
}
=begin doc
Show details about the the Xen instance contained in the given
configuration file.
=end doc
=cut
sub displayInstance
{
my ($file) = (@_);
#
# Read each line.
#
open( FILY, "<", $file );
my @LINES = <FILY>;
close(FILY);
#
# Is it dynamic?
#
my $dhcp = 0;
my $ip = '';
my $mac = '';
my $name = '';
my $mem = 0;
foreach my $line (@LINES)
{
if ( $line =~ /^\s*dhcp\s*=\s*"dhcp\"/i )
{
$dhcp = 1;
}
if ( $line =~ /^\s*name\s*=\s*["']([^'"]+)['"]/i )
{
$name = $1;
}
if ( $line =~ /.*memory[^0-9]*([0-9]+)/i )
{
$mem = $1;
}
if ( $line =~ /ip=([0-9\.]+)/ )
{
$ip = $1;
}
if ( $line =~ /mac=['\"]([^'\"]+)['\"]/ )
{
$mac = " [MAC: $1]";
}
}
print "Name: $name\n";
print "Memory: $mem\n";
print "IP: " . $ip . $mac . "\n" if length($ip);
print "DHCP" . $mac . "\n" if $dhcp;
}
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