/usr/bin/xen-delete-image 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-delete-image - Delete previously created Xen instances.
=head1 SYNOPSIS
xen-delete-image [options] [--hostname=]imageName1 [--hostname=]imageName2
Help Options:
--help Show help information.
--manual Read the manual for this script.
--version Show the version information and exit.
--verbose Show diagnostic output.
General options:
--dir Specify the output directory where images were previously saved.
--evms Specify the EVMS container to use.
--lvm Specify the LVM volume to use.
Specifying hosts:
--hostname Specify the image name to delete.
Testing options:
--test Don't complain if we're not invoked by root.
=cut
=head1 OPTIONS
=over 8
=item B<--dir>
Specify the output directory where images were previously saved.
=item B<--evms>
Specify the EVMS container where images were previously saved.
=item B<--help>
Show help information.
=item B<--hostname>
Specify the hostname to delete.
=item B<--lvm>
Specify the LVM volume group where images were previously saved.
=item B<--manual>
Read the manual for this script.
=item B<--test>
Do not complain, or exit, if the script is not executed by the root user.
=item B<--version>
Show the version number and exit.
=back
=cut
=head1 DESCRIPTION
xen-delete-image is a simple script which allows you to delete
Xen instances which have previously been created by xen-create-image.
You must be root to run this script as it removes the Xen configuration
file from /etc/xen and potentially removes LVM and EVMS volumes.
(When invoked with the '--test' flag the script will continue running,
but will fail to remove anything which the user does not have permission
to delete.)
=cut
=head1 LOOPBACK EXAMPLE
Assuming that you have three images 'foo', 'bar', and 'baz', stored
beneath /home/xen the first two may be deleted via:
xen-delete-image --dir=/home/xen foo bar
You may also delete them by running:
xen-delete-image --dir=/home/xen --hostname=foo --hostname=bar
(The matching Xen configuration files beneath /etc/xen will also be
removed.)
=cut
=head1 LVM EXAMPLE
Assuming that you have the volume group 'skx-vol' containing three
Xen instances 'foo', 'bar', and 'baz' the first two may be deleted via:
xen-delete-image --lvm=skx-vol foo bar
This will remove the volumes 'foo-disk', 'foo-swap', 'bar-disk',
and 'bar-swap'.
Note that if the images were created with "--noswap" then the swap
volumes will not be present, so will not need to be deleted.
The Xen configuration files will also be removed from beneath /etc/xen.
=cut
=head1 EVMS EXAMPLE
Assuming that you have the container 'mycontainer' containing three
Xen instances 'foo', 'bar', and 'baz' the first two may be deleted via:
xen-delete-image --evms=lvm2/mycontainer --hostname=foo --hostname=bar
This will remove the volumes 'foo-disk', 'foo-swap', 'bar-disk',
and 'bar-swap'.
Note that if the images were created with "--noswap" then the swap
volumes will not be present, so will not need to be deleted.
The Xen configuration files will also be removed.
=cut
=head1 AUTHORS
Steve Kemp, http://www.steve.org.uk/
Axel Beckert, http://noone.org/abe/
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 Getopt::Long;
use Pod::Usage;
use File::Path;
#
# 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;
#
# Release number.
#
my $RELEASE = '4.2.1';
#
# Read the global configuration file if it exists.
#
if ( -e "/etc/xen-tools/xen-tools.conf" )
{
readConfigurationFile("/etc/xen-tools/xen-tools.conf");
}
#
# Parse command line arguments, these override the values from the
# configuration file.
#
parseCommandLineArguments();
#
# Check that we got valid arguments.
#
checkArguments();
#
# Abort if non-root user.
#
if ( ( !$CONFIG{ 'test' } ) && ( $EFFECTIVE_USER_ID != 0 ) )
{
print <<E_O_ROOT;
This script is not running with root privileges, so the configuration
file(s) beneath /etc/xen will not be removed.
E_O_ROOT
exit 127;
}
#
# Loop over the supplied arguments, and attempt to delete each
# image.
#
while ( my $name = shift )
{
if ( !xenRunning($name) )
{
deleteXenImage($name);
}
else
{
print "Skipping xen guest '$name' - it appears to be running.\n";
}
}
#
# Also delete any which were specified using the --hostname flag
#
my $hosts = $CONFIG{ 'hostname' };
foreach my $name (@$hosts)
{
if ( !xenRunning($name) )
{
deleteXenImage($name);
}
else
{
print "Skipping xen guest '$name' - it appears to be running.\n";
}
}
#
# All done.
#
exit 0;
=begin doc
Read the configuration file specified.
=end doc
=cut
sub readConfigurationFile
{
my ($file) = (@_);
open( FILE, "<", $file ) or die "Cannot read file '$file' - $!";
my $line = "";
while ( defined( $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;
$CONFIG{ 'dry-run' } = 0;
# Parse options.
#
GetOptions( "dir=s", \$CONFIG{ 'dir' },
"dry-run", \$CONFIG{ 'dry-run' },
"lvm=s", \$CONFIG{ 'lvm' },
"evms=s", \$CONFIG{ 'evms' },
"hostname=s@", \$CONFIG{ 'hostname' },
"test", \$CONFIG{ 'test' },
"verbose", \$CONFIG{ 'verbose' },
"help", \$HELP,
"manual", \$MANUAL,
"version", \$VERSION
);
pod2usage(1) if $HELP;
pod2usage( -verbose => 2 ) if $MANUAL;
if ($VERSION)
{
my $REVISION = '$Revision: 1.41 $';
if ( $REVISION =~ /1.([0-9.]+) / )
{
$REVISION = $1;
}
print "xen-delete-image release $RELEASE - CVS: $REVISION\n";
exit;
}
}
=begin doc
Check that we received the arguments we expected.
=end doc
=cut
sub checkArguments
{
#
# When testing we only care about loopback images, not disk images.
#
if ( $CONFIG{ 'test' } )
{
$CONFIG{ 'lvm' } = undef;
$CONFIG{ 'evms' } = undef;
}
#
# Make sure we got one and only one installation method.
#
my $count = 0;
foreach my $type (qw/dir lvm evms/)
{
$count += 1 if defined( $CONFIG{ $type } );
}
#
# Show a decent error for when either zero or more than one options
# were selected.
#
if ( $count != 1 )
{
print "Please select one and only one of the installation methods to delete the DomU:\n";
print " --dir\n";
print " --evms\n";
print " --lvm\n";
exit;
}
}
=begin doc
Test to see if the given instance is running.
=end doc
=cut
sub xenRunning
{
my ($hostname) = (@_);
my $running = 0;
open( CMD, "xm list $hostname 2>/dev/null |" ) or
die "Failed to run 'xm list $hostname'";
while (<CMD>)
{
my $line = $_;
$running = 1 if ( $line =~ /\Q$hostname\E/ );
}
close(CMD);
return ($running);
}
=begin doc
Delete the named image, and the corresponding configuration file
from /etc/xen.
=end doc
=cut
sub deleteXenImage
{
my ($hostname) = (@_);
#
# Collect the names of files to delete.
#
my @delete;
#
# Delete the Xen auto-start file if it exists.
#
if ( -e "/etc/xen/auto/$hostname.cfg" )
{
push( @delete, "/etc/xen/auto/$hostname.cfg" );
}
#
# Delete the Xen configuration file if it exists.
#
if ( -e "/etc/xen/$hostname.cfg" )
{
push( @delete, "/etc/xen/$hostname.cfg" );
}
#
# If we're working on disk images remove them.
#
foreach my $file (@delete)
{
if ( -e $file )
{
if ($CONFIG{ 'dry-run' }) {
print "Would delete: $file\n";
} else {
print "Deleting: $file\n";
unlink($file);
}
}
else
{
print "Ignoring missing file: $file\n";
}
}
if ( defined( $CONFIG{ 'dir' } ) )
{
my $prefix = $CONFIG{ 'dir' } . "/domains/";
#
# Now remove the directory.
#
if ( -d $prefix . $hostname )
{
if ($CONFIG{ 'dry-run' }) {
print "Would delete: $prefix$hostname\n";
} else {
print "Removing: " . $prefix . $hostname . "\n";
rmtree( $prefix . $hostname );
}
}
}
elsif ( defined( $CONFIG{ 'lvm' } ) )
{
#
# LVM volumes
#
#
# TODO: Check we're not mounted.
#
if ( -e "/dev/$CONFIG{'lvm'}/$hostname-swap" )
{
if ($CONFIG{ 'dry-run' }) {
print "Would remove LVM swap volume /dev/$CONFIG{'lvm'}/$hostname-swap\n";
} else {
print "Removing swap volume\n";
runCommand("lvremove /dev/$CONFIG{'lvm'}/$hostname-swap --force");
}
}
if ( -e "/dev/$CONFIG{'lvm'}/$hostname-disk" )
{
if ($CONFIG{ 'dry-run' }) {
print "Would remove LVM disk volume /dev/$CONFIG{'lvm'}/$hostname-disk\n";
} else {
print "Removing LVM disk volume\n";
runCommand("lvremove /dev/$CONFIG{'lvm'}/$hostname-disk --force");
}
}
}
elsif ( defined( $CONFIG{ 'evms' } ) )
{
#
# EVMS volumes
#
#
# TODO: Check we're not mounted.
#
if ( -e "/dev/evms/$hostname-swap" )
{
if ($CONFIG{ 'dry-run' }) {
print "Would remove EVMS swap volume: /dev/evms/$hostname-swap\n";
print "Would remove EVMS swap volume: $CONFIG{'evms'}/$hostname-swap\n";
} else {
print "Removing EVMS swap volume\n";
runCommand("echo Delete : /dev/evms/$hostname-swap | evms");
runCommand("echo Delete : $CONFIG{'evms'}/$hostname-swap | evms");
}
}
if ( -e "/dev/evms/$hostname-disk" )
{
if ($CONFIG{ 'dry-run' }) {
print "Would remove EVMS disk volume: /dev/evms/$hostname-swap\n";
print "Would remove EVMS disk volume: $CONFIG{'evms'}/$hostname-swap\n";
} else {
print "Removing EVMS disk volume\n";
runCommand("echo Delete : /dev/evms/$hostname-disk | evms");
runCommand("echo Delete : $CONFIG{'evms'}/$hostname-disk | evms");
}
}
}
else
{
print "Error: No installation type specified\n";
print "Can't happen!\n";
print "Hostname : $hostname\n";
exit 127;
}
}
=begin doc
A utility method to run a system command. We will capture the return
value and exit if the command files.
When running verbosely we will also display any command output.
=end doc
=cut
sub runCommand
{
my ($cmd) = (@_);
#
# Header.
#
$CONFIG{ 'verbose' } && print "Executing : $cmd\n";
#
# Hide output unless running with --debug.
#
if ( $CONFIG{ 'verbose' } )
{
#
# Copy stderr to stdout, so we can see it.
#
$cmd .= " 2>&1";
}
else
{
$cmd .= " >/dev/null 2>/dev/null";
}
#
# Run it.
#
my $output = `$cmd`;
if ( $? != 0 )
{
print "Running command '$cmd' failed.\n";
print "Aborting\n";
exit;
}
#
# All done.
#
$CONFIG{ 'verbose' } && print "Output\n";
$CONFIG{ 'verbose' } && print "======\n";
$CONFIG{ 'verbose' } && print $output . "\n";
$CONFIG{ 'verbose' } && print "Finished : $cmd\n";
return ($output);
}
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