354 lines
5.9 KiB
Perl
Executable File
354 lines
5.9 KiB
Perl
Executable File
#!/usr/bin/perl -w
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=head1 NAME
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xen-delete-image - Delete previously created Xen instances.
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=head1 SYNOPSIS
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xen-delete-image [options] imageName1 imageName2 ... imageNameN
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Help Options:
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--help Show help information.
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--manual Read the manual for this script.
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--version Show the version information and exit.
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General options:
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--dir Specify the output directory where images were previously saved.
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--volume Specify the LVM volume to use.
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Testing options:
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--test Don't complain if we're not invoked by root.
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=cut
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=head1 OPTIONS
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=over 8
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=item B<--dir>
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Specify the output directory where images were previously saved.
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=item B<--help>
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Show help information.
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=item B<--manual>
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Read the manual for this script.
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=item B<--test>
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Don not complain, or exit, if the script is not executed by the root user.
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=item B<--version>
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Show the version number and exit.
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=item B<--volume>
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Specify the LVM volume where images were previously saved.
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=back
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=cut
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=head1 DESCRIPTION
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xen-delete-image is a simple script which allows you to delete
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Xen instances which have previously been created.
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You must be root to run this script as it removes the Xen configuration
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file from /etc/xen. (When invoked with the '--test' flag the script will
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continue running, but will fail to remove anything which the user does
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not have permission to delete.)
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=cut
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=head1 EXAMPLES
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Assuming that you have three images 'foo', 'bar', and 'baz', stored
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beneath /home/xen the first two may be deleted via:
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xen-delete-image --dir=/home/xen foo bar
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=cut
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=head1 AUTHOR
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Steve
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--
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http://www.steve.org.uk/
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$Id: xen-delete-image,v 1.29 2006-05-07 14:36:40 steve Exp $
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=cut
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=head1 LICENSE
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Copyright (c) 2005 by Steve Kemp. All rights reserved.
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This module is free software;
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you can redistribute it and/or modify it under
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the same terms as Perl itself.
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The LICENSE file contains the full text of the license.
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=cut
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use strict;
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use English;
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use Getopt::Long;
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use Pod::Usage;
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#
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# Configuration options, initially read from the configuration files
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# but may be overridden by the command line.
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#
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# Command line flags *always* take precedence over the configuration file.
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#
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my %CONFIG;
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#
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# Release number.
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#
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my $RELEASE = '1.4';
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#
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# Read the global configuration file if it exists.
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#
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if ( -e "/etc/xen-tools/xen-tools.conf" )
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{
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readConfigurationFile( "/etc/xen-tools/xen-tools.conf" );
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}
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#
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# Parse command line arguments, these override the values from the
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# configuration file.
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#
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parseCommandLineArguments();
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#
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# Make sure we have either a volume, or a root.
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#
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if ( $CONFIG{'volume'} && $CONFIG{'dir'} )
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{
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print "Please only use a volume or a directory name - not both\n";
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exit;
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}
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if ( ! defined( $CONFIG{'dir'} ) )
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{
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print "The xen domain directory has not been specified\n";
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exit;
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}
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else
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{
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if ( ! -d $CONFIG{'dir'} )
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{
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print "The Xen domain directory '$CONFIG{'dir'}' doesn't exist\n";
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exit;
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}
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}
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#
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# Volumes are not supported yet :(
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#
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if ( $CONFIG{'volume'} )
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{
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print "LVM Volumes are not supported yet\n";
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exit;
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}
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#
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# Abort if non-root user.
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#
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if ( (!$CONFIG{'test'}) && ( $EFFECTIVE_USER_ID != 0 ) )
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{
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print <<E_O_ROOT;
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This script is not running with root privileges, so the configuration
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file(s) beneath /etc/xen will not be removed.
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E_O_ROOT
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exit;
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}
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#
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# Loop over the supplied arguments, and attempt to delete each
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# image.
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#
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while( my $name = shift )
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{
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deleteXenImage( $name );
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}
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#
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# All done.
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#
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exit;
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=head2 readConfigurationFile
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Read the configuration file specified.
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=cut
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sub readConfigurationFile
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{
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my ($file) = ( @_ );
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open( FILE, "<", $file ) or die "Cannot read file '$file' - $!";
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my $line = "";
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while (defined($line = <FILE>) )
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{
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chomp $line;
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if ($line =~ s/\\$//)
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{
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$line .= <FILE>;
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redo unless eof(FILE);
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}
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# Skip lines beginning with comments
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next if ( $line =~ /^([ \t]*)\#/ );
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# Skip blank lines
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next if ( length( $line ) < 1 );
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# Strip trailing comments.
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if ( $line =~ /(.*)\#(.*)/ )
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{
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$line = $1;
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}
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# Find variable settings
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if ( $line =~ /([^=]+)=([^\n]+)/ )
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{
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my $key = $1;
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my $val = $2;
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# Strip leading and trailing whitespace.
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$key =~ s/^\s+//;
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$key =~ s/\s+$//;
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$val =~ s/^\s+//;
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$val =~ s/\s+$//;
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# Store value.
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$CONFIG{ $key } = $val;
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}
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}
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close( FILE );
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}
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=head2 parseCommandLineArguments
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Parse the arguments specified upon the command line.
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=cut
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sub parseCommandLineArguments
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{
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my $HELP = 0;
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my $MANUAL = 0;
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my $VERSION = 0;
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# Parse options.
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#
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GetOptions(
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"dir=s", \$CONFIG{'dir'},
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"volume=s", \$CONFIG{'volume'},
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"test", \$CONFIG{'test'},
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"help", \$HELP,
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"manual", \$MANUAL,
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"version", \$VERSION
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);
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pod2usage(1) if $HELP;
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pod2usage(-verbose => 2 ) if $MANUAL;
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if ( $VERSION )
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{
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my $REVISION = '$Revision: 1.29 $';
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if ( $REVISION =~ /1.([0-9.]+) / )
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{
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$REVISION = $1;
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}
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print "xen-delete-image release $RELEASE - CVS: $REVISION\n";
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exit;
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}
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}
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=head2 deleteXenImage
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Delete the named image, and the corresponding configuration file
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from /etc/xen.
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=cut
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sub deleteXenImage
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{
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my ($hostname) = ( @_ );
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#
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# Delete the configuration file.
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#
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if ( -e "/etc/xen/" . $hostname . ".cfg" )
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{
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unlink( "/etc/xen/" . $hostname . ".cfg" );
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}
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#
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# Now the swap image
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#
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if ( -e $CONFIG{'dir'} . "/domains/" . $hostname . "/swap.img" )
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{
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unlink( $CONFIG{'dir'} . "/domains/" . $hostname . "/swap.img" );
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}
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#
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# Now the disk image
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#
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if ( -e $CONFIG{'dir'} . "/domains/" . $hostname . "/disk.img" )
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{
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unlink( $CONFIG{'dir'} . "/domains/" . $hostname . "/disk.img" );
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}
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#
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# Now remove the directory.
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#
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if ( -d $CONFIG{'dir'} . "/domains/" . $hostname )
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{
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rmdir ( $CONFIG{'dir'} . "/domains/" . $hostname );
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}
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}
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