1035 lines
21 KiB
Perl
Executable File
1035 lines
21 KiB
Perl
Executable File
#!/usr/bin/perl -w
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=head1 NAME
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xt-install-image - Install a fresh copy of GNU/Linux into a directory
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=cut
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=head1 SYNOPSIS
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xt-install-image [options]
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Help Options:
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--help Show this scripts help information.
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--manual Read this scripts manual.
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--version Show the version number and exit.
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Debugging Options:
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--verbose Be verbose in our execution.
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Mandatory Options:
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--location The location to use for the new installation
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--dist The name of the distribution which has been installed.
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Misc Options:
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--arch Pass the given arch setting to debootstrap or rpmstrap.
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--config Read the specified config file in addition to the global
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configuration file.
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--mirror The mirror to use when installing with 'debootstrap'.
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Installation Options:
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--install-method Specify the installation method to use.
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--install-source Specify the installation source to use.
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All other options from xen-create-image will be passed as environmental
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variables.
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=cut
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=head1 NOTES
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This script is invoked by xen-create-image after to create a new
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distribution of Linux. Once the script has been created the companion
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script xt-customize-image will be invoked to perform the network
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configuration, etc.
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=cut
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=head1 INSTALLATION METHODS
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There are several available methods of installation, depending upon the
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users choice. Only one option may be chosen at any given time.
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The methods available are:
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=over 8
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=item B<debootstrap>
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Install the distribution specified by the B<--dist> argument using the debootstrap. If you use this option you must specify a mirror with B<--mirror>.
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=item B<copy>
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Copy the given directory recursively. This local directory is assumed to contain a complete installation. Specify the directory to copy with the B<--install-source> argument.
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=item B<rinse>
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Install the distribution specified by B<--dist> using the rinse command.
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=item B<rpmstrap>
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Install the distribution specified by B<--dist> using the rpmstrap command.
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=item B<tar>
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Untar a .tar file into the new installation location. This tarfile is assumed to contain a complete archived system. Specify the directory to copy with the B<--install-source> argument.
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=back
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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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=cut
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=head1 LICENSE
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Copyright (c) 2005-2007 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 Env;
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use File::Copy;
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use Getopt::Long;
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use Pod::Usage;
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#
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# Configuration values read from the command line.
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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 = '3.9';
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#
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# Dispatch table mapping installation types to their names.
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#
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# The names are the methods, and the hash keys are:
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#
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# sub The routine to execute.
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# needBinary If set the name of an executable we need to exist.
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# needFile Defined if we need an install-source file specified.
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# needDirectory Defined if we need an install-source directory specified.
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#
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#
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my %dispatch =
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(
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"copy" =>
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{
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sub => \&do_copy,
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needBinary => "/bin/cp",
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needDirectory => 1,
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},
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"debootstrap" =>
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{
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sub => \&do_debootstrap,
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needBinary => "/usr/sbin/debootstrap",
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},
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"image-server" =>
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{
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sub => \&do_image_server,
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needURL => 1,
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},
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"rinse" =>
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{
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sub => \&do_rinse,
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needBinary => "/usr/bin/rinse",
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},
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"rpmstrap" =>
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{
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sub => \&do_rpmstrap,
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needBinary => "/usr/bin/rpmstrap",
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},
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"tar" =>
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{
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sub => \&do_tar,
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needBinary => "/bin/tar",
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needFile => 1,
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}
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);
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#
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# Read the global configuration file.
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#
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readConfigurationFile( "/etc/xen-tools/xen-tools.conf" );
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#
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# Parse the command line arguments.
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#
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parseCommandLineArguments();
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#
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# If we received a configuration file then read it.
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#
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if ( $CONFIG{'config'} )
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{
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my $path = $CONFIG{'config'};
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# If not fully-qualified then read from /etc/xen-tools.
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if ( $path !~ /^[\/]/ )
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{
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$path = "/etc/xen-tools/" . $path;
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}
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# Read the file, if it exists.
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readConfigurationFile( $path ) if ( -e $path );
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}
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#
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# Check our arguments
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#
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checkArguments();
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#
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# Now lookup our installation type and dispatch control to it.
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#
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if ( defined( $CONFIG{'install-method'} ) &&
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length( $CONFIG{'install-method'} ) )
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{
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#
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# Get the entry from the dispatch table.
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#
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my $installer = $dispatch{ lc($CONFIG{'install-method'}) };
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if ( defined( $installer ) )
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{
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#
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# If we found it.
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#
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# Do we need to test for a binary.
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if ( ( $installer->{'needBinary'} ) &&
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( ! -x $installer->{'needBinary'} ) )
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{
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print "The following required binary for the installation was not found\n";
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print "\t" . $installer->{'needBinary'} . "\n";
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exit 1;
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}
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# Do we need a directory specified as the installation source?
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if ( ( $installer->{'needDirectory'} ) &&
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( ! $CONFIG{'install-source'} || ! -d $CONFIG{'install-source'} ) )
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{
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print "Please specify the source directory with --install-source\n";
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if ( $CONFIG{'install-source'} )
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{
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print "The specified directory $CONFIG{'install-source'} does not exist.\n";
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}
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exit 1;
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}
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# Do we need a file specified as the installation source?
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if ( ( $installer->{'needFile'} ) &&
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( ! $CONFIG{'install-source'} || ! -e $CONFIG{'install-source'} ) )
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{
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print "Please specify the source file with --install-source\n";
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if ( $CONFIG{'install-source'} )
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{
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print "The specified file $CONFIG{'install-source'} does not exist.\n";
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}
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exit 1;
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}
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# Do we need an URL specified as the installation source?
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if ( ( $installer->{'needURL'} ) &&
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( ! $CONFIG{'install-source'} ||
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( $CONFIG{'install-source'} !~ /^http/i ) ) )
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{
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print "Please specify the image server URL with --install-source\n";
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exit 1;
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}
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#
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# Now we can call the appropriate handler.
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#
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$installer->{'sub'}->();
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#
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# Did the operation succeed?
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#
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# Test that we have some "standard" files present.
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#
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foreach my $file ( qw( /bin/ls /bin/cp ) )
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{
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if ( ! -x $CONFIG{'location'} . $file )
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{
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print "The installation of the new system has failed.\n";
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print "\n";
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print "The system is missing the common file: $file\n";
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exit 1;
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}
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}
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#
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# All done.
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#
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exit 0;
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}
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else
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{
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print "The installation method specified is invalid.\n";
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exit 1;
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}
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}
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else
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{
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print "An installation method is mandatory\n";
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exit 1;
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}
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=begin doc
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Read the specified configuration file, and update our global configuration
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hash with the values found in it.
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=end doc
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=cut
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sub readConfigurationFile
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{
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my ($file) = ( @_ );
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# Don't read the file if it doesn't exist.
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return if ( ! -e $file );
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my $line = "";
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open( FILE, "<", $file ) or die "Cannot read file '$file' - $!";
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while (defined($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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# command expansion?
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if ( $val =~ /(.*)`([^`]+)`(.*)/ )
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{
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# store
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my $pre = $1;
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my $cmd = $2;
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my $post = $3;
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# get output
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my $output = `$cmd`;
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chomp( $output );
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# build up replacement.
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$val = $pre . $output . $post;
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}
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# Store value.
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$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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=begin doc
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Parse the command line arguments this script was given.
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=end doc
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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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#
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# Parse options.
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#
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GetOptions(
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# Mandatory
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"location=s", \$CONFIG{'location'},
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"dist=s", \$CONFIG{'dist'},
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"hostname=s", \$CONFIG{'hostname'},
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# Installation method
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"install-method=s", \$CONFIG{'install-method'},
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"install-source=s", \$CONFIG{'install-source'},
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# Misc
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"arch=s", \$CONFIG{'arch'},
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"cache=s", \$CONFIG{'cache'},
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"config=s", \$CONFIG{'config'},
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"mirror=s", \$CONFIG{'mirror'},
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# Help.
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"verbose", \$CONFIG{'verbose'},
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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: 1.65 $';
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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 "xt-install-image release $RELEASE - CVS: $REVISION\n";
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exit;
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}
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}
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=begin doc
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Test that the command line arguments we were given make sense.
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=end doc
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=cut
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sub checkArguments
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{
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#
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# We require a location.
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#
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if ( ! defined( $CONFIG{'location'} ) )
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{
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print "The '--location' argument is mandatory\n";
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exit 1;
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}
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#
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# Test that the location we've been given exists
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#
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if ( ! -d $CONFIG{'location'} )
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{
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print "The installation directory we've been given doesn't exist\n";
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print "We tried to use : $CONFIG{'location'}\n";
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exit 1;
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}
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#
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# We require a distribution name.
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#
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if ( ! defined( $CONFIG{'dist'} ) )
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{
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print "The '--dist' argument is mandatory\n";
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exit 1;
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}
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#
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# Test that the distribution name we've been given
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# to configure has a collection of hook scripts.
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#
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# If there are no scripts then we clearly cannot
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# customise it!
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#
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my $dir = "/usr/lib/xen-tools/" . $CONFIG{'dist'} . ".d";
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if ( ! -d $dir )
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{
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print <<E_OR;
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We're trying to configure an installation of $CONFIG{'dist'} in
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$CONFIG{'location'} - but there is no hook directory for us to use.
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This means we won't know how to configure this installation.
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We'd expect the hook directory to be : $dir
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Aborting.
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E_OR
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exit 1;
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}
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#
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# Test that we received a valid installation type.
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#
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my $valid = 0;
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if ( defined( $CONFIG{'install-method'} ) )
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{
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foreach my $recognised ( keys %dispatch )
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{
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$valid = 1 if ( lc($CONFIG{'install-method'}) eq lc($recognised) );
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}
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}
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else
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{
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$valid = 1;
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}
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if ( !$valid )
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{
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print <<EOF;
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Please specify the installation method to use.
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For example:
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--install-method=copy --install-source=/some/path
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--install-method=debootstrap
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--install-method=rpmstrap
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--install-method=tar --install-source=/some/file.tar
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EOF
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exit;
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}
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}
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=begin doc
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A utility method to run a system command. We will capture the return
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value and exit if the command fails.
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When running verbosely we will also display any command output.
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=end doc
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=cut
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sub runCommand
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{
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my ( $cmd ) = (@_ );
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#
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# Command start.
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#
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$CONFIG{'verbose'} && print "Executing : $cmd\n";
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|
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#
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# Copy stderr to stdout, so we can see it, and make sure we log it.
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#
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$cmd .= " 2>&1 | tee --append /var/log/xen-tools/$CONFIG{'hostname'}.log";
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|
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#
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# Run it.
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#
|
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my $output = `$cmd`;
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if ( $? != 0 )
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{
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print "Running command '$cmd' failed.\n";
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print "Aborting\n";
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exit;
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}
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|
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#
|
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# Command finished.
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#
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$CONFIG{'verbose'} && print "Finished : $cmd\n";
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return( $output );
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}
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|
|
|
|
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|
=begin doc
|
|
|
|
This function will copy all the .deb files from one directory
|
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to another as a caching operation which will speed up installations via
|
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debootstrap.
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|
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=end doc
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|
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=cut
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|
|
sub copyDebFiles
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{
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my ( $source, $dest ) = ( @_ );
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|
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print "Copying files from $source -> $dest\n";
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|
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#
|
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# Loop over only .deb files.
|
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#
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foreach my $file ( sort ( glob( $source . "/*.deb" ) ) )
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{
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my $name = $file;
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if ( $name =~ /(.*)\/(.*)/ )
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{
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$name = $2;
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}
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|
|
#
|
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# Only copy if the file doesn't already exist.
|
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#
|
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if ( ! ( -e $dest . "/" . $name ) )
|
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{
|
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File::Copy::cp( $file, $dest );
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}
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}
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|
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print "Done\n";
|
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}
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|
|
|
|
|
|
|
|
|
|
###
|
|
#
|
|
# Installation functions follow.
|
|
#
|
|
###
|
|
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a new image of a distribution using `cp`.
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_copy
|
|
{
|
|
#
|
|
# Find the copy command to run from the configuration file.
|
|
#
|
|
my $cmd = $CONFIG{'copy-cmd'} ;
|
|
if ( !defined( $cmd ) )
|
|
{
|
|
print "Falling back to default copy command\n";
|
|
$cmd = '/bin/cp -a $src/* $dest'; # Note: single quotes.
|
|
}
|
|
|
|
#
|
|
# Expand the source and the destination.
|
|
#
|
|
$cmd =~ s/\$src/$CONFIG{'install-source'}/g;
|
|
$cmd =~ s/\$dest/$CONFIG{'location'}/g;
|
|
|
|
#
|
|
# Run the copy command.
|
|
#
|
|
runCommand( $cmd );
|
|
}
|
|
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a new image of Debian using 'debootstrap'.
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_debootstrap
|
|
{
|
|
#
|
|
# The command is a little configurable - mostly to allow you
|
|
# to use cdebootstrap.
|
|
#
|
|
my $cmd = $CONFIG{'debootstrap-cmd'} ;
|
|
if ( !defined( $cmd ) )
|
|
{
|
|
print "Falling back to default debootstrap command\n";
|
|
$cmd = '/usr/sbin/debootstrap';
|
|
}
|
|
|
|
|
|
#
|
|
# Cache from host -> new installation if we've got caching
|
|
# enabled.
|
|
#
|
|
if ( $CONFIG{'cache'} eq "yes" )
|
|
{
|
|
print "\nCopying files from host to image.\n";
|
|
runCommand( "mkdir -p $CONFIG{'location'}/var/cache/apt/archives" );
|
|
copyDebFiles( "/var/cache/apt/archives", "$CONFIG{'location'}/var/cache/apt/archives" );
|
|
print( "Done\n" );
|
|
}
|
|
|
|
#
|
|
# Propogate --verbose appropriately.
|
|
#
|
|
my $EXTRA = '';
|
|
if ( $CONFIG{'verbose'} )
|
|
{
|
|
$EXTRA = ' --verbose';
|
|
}
|
|
|
|
#
|
|
# Propogate the --arch argument
|
|
#
|
|
if ( $CONFIG{'arch'} )
|
|
{
|
|
$EXTRA .= " --arch $CONFIG{'arch'}"
|
|
}
|
|
|
|
|
|
#
|
|
# This is the command we'll run
|
|
#
|
|
my $command = "$cmd $EXTRA $CONFIG{'dist'} $CONFIG{'location'} $CONFIG{'mirror'}";
|
|
|
|
#
|
|
# Run the command.
|
|
#
|
|
runCommand( $command );
|
|
|
|
|
|
#
|
|
# Cache from the new installation -> the host if we've got caching
|
|
# enabled.
|
|
#
|
|
if ( $CONFIG{'cache'} eq "yes" )
|
|
{
|
|
print "\nCopying files from new installation to host.\n";
|
|
copyDebFiles( "$CONFIG{'location'}/var/cache/apt/archives",
|
|
"/var/cache/apt/archives" );
|
|
print( "Done\n" );
|
|
}
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a system using the image-server.
|
|
|
|
Note: NON-Advertised ....
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_image_server
|
|
{
|
|
#
|
|
# Load the modules we require.
|
|
#
|
|
my $test = 'use LWP::UserAgent; use CGI;';
|
|
|
|
#
|
|
# Test loading the module, if it fails then
|
|
# we must abort. We don't want to insist the module
|
|
# is installed since that adds to the dependencies
|
|
# which users will not require for the typical installation
|
|
# method(s).
|
|
#
|
|
eval( $test );
|
|
if ( $@ )
|
|
{
|
|
die "The module LDP::UserAgent wasn't found...\n";
|
|
}
|
|
|
|
|
|
#
|
|
# The number of attempts to request the image from our
|
|
# image server, and the time to sleep between them.
|
|
#
|
|
my $attempts = 30;
|
|
my $sleep = 30;
|
|
|
|
|
|
#
|
|
# Build up the request we're going to send.
|
|
#
|
|
my $request = $CONFIG{'install-source'} . "/create.cgi?submit=1";
|
|
|
|
#
|
|
# Some parameters are hard-wired.
|
|
#
|
|
$request .= "&arch=amd64";
|
|
$request .= "&root_device=/dev/sda";
|
|
$request .= "&ip1=" . $ENV{'ip1'};
|
|
$request .= "&dist=" . CGI::escapeHTML( $CONFIG{'dist'} );
|
|
$request .= "&hostname=" . CGI::escapeHTML( $CONFIG{'hostname'} );
|
|
|
|
#
|
|
# We only care about some keys
|
|
#
|
|
foreach my $k ( qw/ dhcp broadcast gateway netmask / )
|
|
{
|
|
# Skip values which aren't defined.
|
|
next unless defined $ENV{$k};
|
|
|
|
# CGI encode.
|
|
my $val = CGI::escapeHTML( $ENV{$k} );
|
|
|
|
# Add on to the request
|
|
$request .= "&$k=$val";
|
|
}
|
|
|
|
|
|
#
|
|
# Create a new user agent.
|
|
#
|
|
my $ua = LWP::UserAgent->new;
|
|
$ua->timeout(10);
|
|
$ua->env_proxy;
|
|
|
|
#
|
|
# Do the creation step
|
|
#
|
|
my $response = $ua->get( $request );
|
|
if ($response->is_success)
|
|
{
|
|
my $content = $response->content;
|
|
|
|
if ( $content =~ /fetch.cgi\?session=([^"]+)"/ )
|
|
{
|
|
my $session = $1;
|
|
my $new = $CONFIG{'install-source'};
|
|
$new .= "/fetch.cgi?session=$session";
|
|
my $attempt = 1;
|
|
|
|
# Make sure we don't wait indefinitely.
|
|
while( $attempt < $attempts )
|
|
{
|
|
$CONFIG{'verbose'} && print "Request: [$attempt/$attempts]\n";
|
|
|
|
#
|
|
# Make a request to see if our tar file is ready yet.
|
|
#
|
|
$response = $ua->head( $new );
|
|
if ( $response->is_success )
|
|
{
|
|
|
|
#
|
|
# Get the headers
|
|
#
|
|
my $header = $response->headers();
|
|
my $type = $header->{'content-type'};
|
|
|
|
#
|
|
# OK our file is correct.
|
|
#
|
|
if ( $type =~ /tar/ )
|
|
{
|
|
#
|
|
# Download it to the installation root.
|
|
#
|
|
$ua->get( $new,
|
|
":content_file" => $CONFIG{'location'} . "/$session.tar"
|
|
);
|
|
|
|
#
|
|
# If it worked .. then untar, remove, and return.
|
|
#
|
|
system( "cd $CONFIG{'location'} && tar --numeric-owner -xf $session.tar && rm -f $CONFIG{'location'}/$session.tar" );
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
sleep( $sleep );
|
|
$attempt += 1;
|
|
|
|
}
|
|
print ( "ERROR: Timeout waiting for image to be ready." );
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
print( "ERROR: Failed to find session. Received this:\n$content\n" );
|
|
return 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
print( "ERROR: Submitting the image create request failed:\n" . $response->status_line );
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a new distribution of GNU/Linux using the rpmstrap tool.
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_rinse
|
|
{
|
|
#
|
|
# The command we're going to run.
|
|
#
|
|
my $command = "rinse --distribution=$CONFIG{'dist'} --directory=$CONFIG{'location'}";
|
|
|
|
#
|
|
# Propogate the --arch argument
|
|
#
|
|
if ( $CONFIG{'arch'} )
|
|
{
|
|
$command .= " --arch $CONFIG{'arch'}"
|
|
}
|
|
|
|
|
|
#
|
|
# Propogate the verbosity setting.
|
|
#
|
|
if ( $CONFIG{'verbose'} )
|
|
{
|
|
$command .= " --verbose";
|
|
}
|
|
|
|
runCommand( $command );
|
|
}
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a new distribution of GNU/Linux using the rpmstrap tool.
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_rpmstrap
|
|
{
|
|
|
|
#
|
|
# Propogate the verbosity setting.
|
|
#
|
|
my $EXTRA='';
|
|
if ( $CONFIG{'verbose'} )
|
|
{
|
|
$EXTRA .= " --verbose";
|
|
}
|
|
|
|
#
|
|
# Propogate any arch setting we might have.
|
|
#
|
|
if ( $CONFIG{'arch'} )
|
|
{
|
|
$EXTRA .= " --arch $CONFIG{'arch'}";
|
|
}
|
|
|
|
#
|
|
# Setup mirror if present.
|
|
#
|
|
my $mirror = "";
|
|
$mirror = $CONFIG{'mirror'} if ( $CONFIG{'mirror'} );
|
|
|
|
#
|
|
# The command we're going to run.
|
|
#
|
|
my $command = "rpmstrap $EXTRA $CONFIG{'dist'} $CONFIG{'location'} $mirror";
|
|
runCommand( $command );
|
|
}
|
|
|
|
|
|
|
|
|
|
=begin doc
|
|
|
|
Install a new image of a distribution using `tar`.
|
|
|
|
=end doc
|
|
|
|
=cut
|
|
|
|
sub do_tar
|
|
{
|
|
#
|
|
# Find the tar command to run from the configuration file.
|
|
#
|
|
my $cmd = $CONFIG{'tar-cmd'} ;
|
|
if ( !defined( $cmd ) )
|
|
{
|
|
print "Falling back to default tar command\n";
|
|
$cmd = '/bin/tar --numeric-owner -xvf $src'; # Note: single quotes.
|
|
}
|
|
|
|
#
|
|
# Expand the tarfile.
|
|
#
|
|
$cmd =~ s/\$src/$CONFIG{'install-source'}/g;
|
|
|
|
#
|
|
# Run a command to copy an installed system into the new root.
|
|
#
|
|
runCommand( "cd $CONFIG{'location'} && $cmd" );
|
|
}
|