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#!/usr/bin/env perl
# Copyright 2012 Norbert Preining
# This file is licensed under the GNU General Public License version 2
# or any later version.
#
# Prune (remove) platforms from a tlnet distribution tree

my $vc_id;
my $mydir;

BEGIN {
  $vc_id = '$Id$';
  $^W = 1;
  ($mydir = $0) =~ s,/[^/]*$,,;
  unshift (@INC, "$mydir/..");
}

use strict;
use TeXLive::TLConfig;
use TeXLive::TLPOBJ;
use TeXLive::TLPDB;
use TeXLive::TLUtils;
use Getopt::Long;
use Pod::Usage;
use File::Path;

my $opt_version = 0;
my $opt_help = 0;
my $opt_dry = 0;

TeXLive::TLUtils::process_logging_options();
GetOptions(
  "dry-run|n"	=> \$opt_dry,
  "version"	=> \$opt_version,
  "help|?"      => \$opt_help) or pod2usage(1);

pod2usage("-exitstatus" => 0, "-verbose" => 2) if $opt_help;
if ($opt_version) { print "$vc_id\n"; exit 0; } 

exit (&main());


sub main
{
  # prune db in the same hierarchy from which we are being run.
  chomp(my $Master = `cd $mydir/../.. && pwd`);
  # necessary for TLUtils->platform
  $::installerdir = $Master;
  my $tlpdb = TeXLive::TLPDB->new("root" => $Master);
  die "cannot find tlpdb in $Master" unless defined($tlpdb);

  my $format = $tlpdb->config_container_format;
  my $type = "xz";
  if ($format ne "xz") {
    tlwarn("$0: unknown container format $format in 00texlive.config; ",
           "ignoring and continuing with $type");
  }

  # check that all archs given on the command line are actual archs,
  # otherwise bail out for security
  my @all_archs = $tlpdb->available_architectures;
  for my $a (@ARGV) {
    if (!TeXLive::TLUtils::member($a, @all_archs)) {
      print "Platform $a not installed, cannot prune, exiting\n";
      exit 1;
    }
  }

  my $containerdir = "$Master/$TeXLive::TLConfig::Archive";

  # loop over packages and remove their binary component
  for my $pkg ($tlpdb->list_packages) {
    # by definition, any 00texlive... package does not need containers.
    next if $pkg =~ /00texlive/;
    
    my $tlp = $tlpdb->get_package($pkg);
    if (!$tlp) {
      # that is a package foobar.$a that has already been remove but
      # is still in the list above, so ignore that
      next;
    }
    foreach my $dep ($tlp->depends) {
      if ($dep =~ m/^(.*)\.ARCH$/) {
        foreach my $a (@ARGV) {
          if ($tlpdb->get_package("$pkg.$a")) {
            # remove entry in the tlpdb
            print "removing $pkg.$a from tlpdb ... ";
            $tlpdb->remove_tlpobj("$pkg.$a") unless $opt_dry;
            print "done\n";
            # remove the container
            if (-r "$containerdir/$pkg.$a.tar.xz") {
              print "removing $containerdir/$pkg.$a.tar.xz ... ";
              `rm $containerdir/$pkg.$a.tar.xz` unless $opt_dry;
              print "done\n";
            }
          }
        }
      }
    }
  }

  my @newarchs;
  for my $a (@all_archs) {
    push @newarchs, $a if !TeXLive::TLUtils::member($a, @ARGV);
  }

  $tlpdb->setting("available_architectures",@newarchs);
  $tlpdb->save unless $opt_dry;

  return 0;
}

__END__

=head1 NAME

tl-prune-platforms - remove platforms from a tlnet hierarchy

=head1 SYNOPSIS

tl-prune-platforms [I<option>] [I<platform>] ...

=head1 OPTIONS

=over 4

=item B<-help>

Print this documentation and exit.

=back

The standard options B<-q>, B<-v>, and B<-logfile>=I<file> are also
accepted; see the C<process_logging_options> function in
L<TeXLive::TLUtils> for details.

The format of the containers and the splitting of source and
documentation files are controlled by the TLPDB options in the
pseudo-package C<00texlive.config>.  See L<TeXLive::TLPDB>.

=head1 DESCRIPTION

This program removes all traces of all platforms given as arguments,
that is: remove the binfiles entries in the tlpdb, and remove the
containers. 

It is used during DVD production to exclude certain
platforms, and is run from the L<tl-update-image> script.

=head1 AUTHORS AND COPYRIGHT

This script and its documentation were written for the TeX Live
distribution (L<http://tug.org/texlive>) and both are licensed under the
GNU General Public License Version 2 or later.

=cut

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