#! /usr/bin/perl -w
    eval 'exec /usr/bin/perl -S $0 ${1+"$@"}'
        if 0; #$running_under_some_shell

# Copyright (c) 2002 Philip Hands <phil@hands.com>
# See the README file for the license

# This script creates the md5sums files, using the precalculated md5sums
# from the main archive
# First arg = the place that gets published as http://.../debian-cd/

use strict;
use MIME::Base64;
use File::Copy;

my $to_dir = shift @ARGV || die "Usage: $0 <to_dir>\n" ;
my %conf;
my %jigdosums;

sub jigsum_to_md5sum ($) {
  my $str = shift;
  
  $str =~ tr%-_%+/% ;                     # convert to  normal base64
  $str =~ tr|A-Za-z0-9+=/||cd;            # remove non-base64 chars
  $str =~ tr|A-Za-z0-9+/| -_|;            # convert to uuencoded format
  
  return unpack('H32', join'',
		map( unpack("u", chr(32 + length($_)*3/4). $_),
		     $str =~ /(.{1,60})/gs));
}

sub mkdirs ($) {
  my $path = shift;

  return if (-d $path) ;

  if ($path =~ m|^(.*)/[^/]*$|) {
    mkdirs($1);
  }

  mkdir($path);
}


# Pick up settings from CONF.sh

open(SHELL, "sh -x CONF.sh 2>&1|") || die;
while(<SHELL>) {
  chomp;
  next unless (/^[+] export (.*)$/);
  next unless ($1 =~ /^'([^=]+)=(.*)'$/ || $1 =~ /^([^=]+)=(.*)$/) ;
  $conf{$1} = $2;
}
close(SHELL) ;

my $from_dir = $conf{'OUT'} ;
my $mirror_dir = $conf{'MIRROR'} ;
my $nonus_dir = $conf{'NONUS'} ;

for my $arch (<$from_dir/*>) {
  my $bad_images ;

  my $to_arch = $arch ;
  $to_arch =~ s|^$from_dir|$to_dir/jigdo| ;
  $to_arch =~ s%/src$%/source% ;
  mkdirs($to_arch) || die ;

  open(MD5OUT, ">$to_arch/MD5SUMS");

  for my $jigdo (<$arch/*.jigdo>) {
    my ($http, $filename, $size, $md5) ;

    # find out the image name
    open (JIGDO, $jigdo) || die;
    my $section = "" ;
    while(<JIGDO>) {
      chomp;
      if (/^\[(.*)\]$/) {
	die "ERROR: don't know how to handle multi-image jigdo files"
	  if ($section eq "Image" && $1 eq "Image") ;
	$section = $1;
	next ;
      }
      if ($section eq "Image") {
	if (/^Filename=(.*)$/) { $filename = $1 ; }
	if (/^Template=(.*)$/) { $http = $1 ; }
      }
      elsif ($section eq "Parts") {
	if (/^([^=]*)=(.*)$/) {
	  my $jigsum = $1 ;
	  my $file = $2 ;
	  if (defined($jigdosums{$file})) {
	    die "sums don't match for $file" if ($jigdosums{$file} ne $jigsum);
	  } else {
	    $jigdosums{$file} = $jigsum ;
	  }
	}
      }   
    }
    close(JIGDO);

    # get the checksum & size from the template
    my $template = $jigdo ;
    $template =~ s/.jigdo$/.template/ ;
    open (TPL, "jigdo-file ls --template $template|") || die;
    while (<TPL>) {
      chomp;
      next unless (/^image-info\s+(\S+)\s+(\S*)\s+(\S+)$/) ;
      $size = $1 ;
      $md5 = jigsum_to_md5sum($2);
    }
    if (!defined($md5)) {
      $bad_images++ ;
      print STDERR "ERROR: md5 not available from $template\n";
      next;
    }
    print STDERR "WARNING: image too small ($size in $template)\n"
      if ($size < 10000000) ;
    print STDERR "WARNING: image too big ($size in $template)\n"
      if ($size > 681574400) ;
    printf MD5OUT "%032s  %s\n", $md5, $filename;
    close(TPL) ;

    copy($template, $to_arch) ||
      die "ERROR copying $template to $to_arch ($!)" ;
    copy($jigdo, $to_arch) ||
      die "ERROR copying $jigdo to $to_arch ($!)" ;
  }
  close(MD5OUT);
  unlink ("$to_arch/MD5SUMS") if ($bad_images) ;

}


# and now we make the hardlink snapshot, and check that all the md5's match
for my $file (sort(keys(%jigdosums))) {
  my $frompath = $file ;
  $frompath =~ s|^Debian:|$mirror_dir/| ;
  $frompath =~ s|^Non-US:|$nonus_dir/| ;

  my $topath = $file ;
  $topath =~ s|^Debian:|$to_dir/snapshot/| ;
  $topath =~ s|^Non-US:|$to_dir/snapshot/| ;

  #    printf "%s  %s\n", jigsum_to_md5sum($jigdosums{$file}), $frompath ;
  #printf "%s\n", $frompath ;
  #printf " --> %s\n", $topath ;

  $topath =~ m|^(.*)/[^/]*$| ;
  mkdirs($1) ;
  if (-f $frompath) {
    link ($frompath, $topath) || die "ERROR: linking $frompath to $topath";
  } else {
    print STDERR "ERROR: $frompath is not a file\n" ;
  }
}