This file is indexed.

/usr/bin/debdiff is in devscripts 2.11.6ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
#! /usr/bin/perl -w

# Original shell script version:
# Copyright 1998,1999 Yann Dirson <dirson@debian.org>
# Perl version:
# Copyright 1999,2000,2001 by Julian Gilbey <jdg@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License, version 2 ONLY,
# as published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

use 5.006_000;
use strict;
use Cwd;
use Dpkg::IPC;
use Dpkg::Compression;
use File::Copy qw(cp move);
use File::Basename;
use File::Path qw/ rmtree /;
use File::Temp qw/ tempdir tempfile /;
use lib '/usr/share/devscripts';
use Devscripts::Versort;

# Predeclare functions
sub wdiff_control_files($$$$$);
sub process_debc($$);
sub process_debI($);
sub mktmpdirs();
sub fatal(@);

my $progname = basename($0);
my $modified_conf_msg;
my $exit_status = 0;
my $dummyname = "---DUMMY---";

sub usage {
    print <<"EOF";
Usage: $progname [option]
   or: $progname [option] ... deb1 deb2
   or: $progname [option] ... changes1 changes2
   or: $progname [option] ... dsc1 dsc2
   or: $progname [option] ... --from deb1a deb1b ... --to deb2a deb2b ...
Valid options are:
    --no-conf, --noconf
                          Don\'t read devscripts config files;
                          must be the first option given
   --help, -h             Display this message
   --version, -v          Display version and copyright info
   --move FROM TO,        The prefix FROM in first packages has
     -m FROM TO             been renamed TO in the new packages
                            (multiple permitted)
   --move-regex FROM TO,  The prefix FROM in first packages has
                            been renamed TO in the new packages
                            (multiple permitted), using regexp substitution
   --dirs, -d             Note changes in directories as well as files
   --nodirs               Do not note changes in directories (default)
   --nocontrol            Skip comparing control files
   --control              Do compare control files
   --controlfiles FILE,FILE,...
                          Which control files to compare; default is just
                            control; could include preinst, etc, config or
                            ALL to compare all control files present
   --wp, --wl, --wt       Pass the option -p, -l, -t respectively to wdiff
                            (only one should be used)
   --wdiff-source-control When processing source packages, compare control
                            files as with --control for binary packages
   --no-wdiff-source-control
                          Do not do so (default)
   --show-moved           Indicate also all files which have moved
                            between packages
   --noshow-moved         Do not also indicate all files which have moved
                            between packages (default)
   --renamed FROM TO      The package formerly called FROM has been
                            renamed TO; only of interest with --show-moved
                            (multiple permitted)
   --quiet, -q            Be quiet if no differences were found
   --exclude PATTERN      Exclude files that match PATTERN
   --ignore-space, -w     Ignore whitespace in diffs
   --diffstat             Include the result of diffstat before the diff
   --no-diffstat          Do not do so (default)
   --auto-ver-sort        When comparing source packages, ensure the
                          comparison is performed in version order
   --no-auto-ver-sort     Do not do so (default)
   --unpack-tarballs      Unpack tarballs found in the top level source
                          directory (default)
   --no-unpack-tarballs   Do not do so

Default settings modified by devscripts configuration files:
$modified_conf_msg
EOF
}

my $version = <<"EOF";
This is $progname, from the Debian devscripts package, version 2.11.6ubuntu1
This code is copyright 1999,2000,2001 by Julian Gilbey <jdg\@debian.org>,
based on original code which is copyright 1998,1999 by
Yann Dirson <dirson\@debian.org>
This program comes with ABSOLUTELY NO WARRANTY.
You are free to redistribute this code under the terms of the
GNU General Public License, version 2 ONLY.
EOF

# Start by setting default values

my $ignore_dirs = 1;
my $compare_control = 1;
my $controlfiles = 'control';
my $show_moved = 0;
my $wdiff_opt = '';
my @diff_opts = ();
my $show_diffstat = 0;
my $wdiff_source_control = 0;
my $auto_ver_sort = 0;
my $unpack_tarballs = 1;

my $quiet = 0;

# Next, read read configuration files and then command line
# The next stuff is boilerplate

if (@ARGV and $ARGV[0] =~ /^--no-?conf$/) {
    $modified_conf_msg = "  (no configuration files read)";
    shift;
} else {
    my @config_files = ('/etc/devscripts.conf', '~/.devscripts');
    my %config_vars = (
		       'DEBDIFF_DIRS' => 'no',
		       'DEBDIFF_CONTROL' => 'yes',
		       'DEBDIFF_CONTROLFILES' => 'control',
		       'DEBDIFF_SHOW_MOVED' => 'no',
		       'DEBDIFF_WDIFF_OPT' => '',
		       'DEBDIFF_SHOW_DIFFSTAT' => 'no',
		       'DEBDIFF_WDIFF_SOURCE_CONTROL' => 'no',
		       'DEBDIFF_AUTO_VER_SORT' => 'no',
		       'DEBDIFF_UNPACK_TARBALLS' => 'yes',
		       );
    my %config_default = %config_vars;

    my $shell_cmd;
    # Set defaults
    foreach my $var (keys %config_vars) {
	$shell_cmd .= "$var='$config_vars{$var}';\n";
    }
    $shell_cmd .= 'for file in ' . join(" ",@config_files) . "; do\n";
    $shell_cmd .= '[ -f $file ] && . $file; done;' . "\n";
    # Read back values
    foreach my $var (keys %config_vars) { $shell_cmd .= "echo \$$var;\n" }
    my $shell_out = `/bin/bash -c '$shell_cmd'`;
    @config_vars{keys %config_vars} = split /\n/, $shell_out, -1;

    # Check validity
    $config_vars{'DEBDIFF_DIRS'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_DIRS'}='no';
    $config_vars{'DEBDIFF_CONTROL'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_CONTROL'}='yes';
    $config_vars{'DEBDIFF_SHOW_MOVED'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_SHOW_MOVED'}='no';
    $config_vars{'DEBDIFF_SHOW_DIFFSTAT'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_SHOW_DIFFSTAT'}='no';
    $config_vars{'DEBDIFF_WDIFF_SOURCE_CONTROL'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_WDIFF_SOURCE_CONTROL'}='no';
    $config_vars{'DEBDIFF_AUTO_VER_SORT'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_AUTO_VER_SORT'}='no';
    $config_vars{'DEBDIFF_UNPACK_TARBALLS'} =~ /^(yes|no)$/
	or $config_vars{'DEBDIFF_UNPACK_TARBALLS'}='yes';

    foreach my $var (sort keys %config_vars) {
	if ($config_vars{$var} ne $config_default{$var}) {
	    $modified_conf_msg .= "  $var=$config_vars{$var}\n";
	}
    }
    $modified_conf_msg ||= "  (none)\n";
    chomp $modified_conf_msg;

    $ignore_dirs = $config_vars{'DEBDIFF_DIRS'} eq 'yes' ? 0 : 1;
    $compare_control = $config_vars{'DEBDIFF_CONTROL'} eq 'no' ? 0 : 1;
    $controlfiles = $config_vars{'DEBDIFF_CONTROLFILES'};
    $show_moved = $config_vars{'DEBDIFF_SHOW_MOVED'} eq 'yes' ? 1 : 0;
    $wdiff_opt = $config_vars{'DEBDIFF_WDIFF_OPT'} =~ /^-([plt])$/ ? $1 : '';
    $show_diffstat = $config_vars{'DEBDIFF_SHOW_DIFFSTAT'} eq 'yes' ? 1 : 0;
    $wdiff_source_control = $config_vars{'DEBDIFF_WDIFF_SOURCE_CONTROL'}
	eq 'yes' ? 1 : 0;
    $auto_ver_sort = $config_vars{'DEBDIFF_AUTO_VER_SORT'} eq 'yes' ? 1 : 0;
    $unpack_tarballs = $config_vars{'DEBDIFF_UNPACK_TARBALLS'} eq 'yes' ? 1 : 0;

}

# Are they a pair of debs, changes or dsc files, or a list of debs?
my $type = '';
my @excludes = ();
my @move = ();
my %renamed = ();


# handle command-line options

while (@ARGV) {
    if ($ARGV[0] =~ /^(--help|-h)$/) { usage(); exit 0; }
    if ($ARGV[0] =~ /^(--version|-v)$/) { print $version; exit 0; }
    if ($ARGV[0] =~ /^(--move(-regex)?|-m)$/) {
	fatal "Malformed command-line option $ARGV[0]; run $progname --help for more info"
	    unless @ARGV >= 3;

	my $regex = $ARGV[0] eq '--move-regex' ? 1 : 0;
	shift @ARGV;

	# Ensure from and to values all begin with a slash
	# dpkg -c produces filenames such as ./usr/lib/filename
	my $from = shift;
	my $to   = shift;
	$from =~ s%^\./%/%;
	$to   =~ s%^\./%/%;

	if ($regex) {
	    # quote ':' in the from and to patterns;
	    # used later as a pattern delimiter
	    $from =~ s/:/\\:/g;
	    $to =~ s/:/\\:/g;
	}
	push @move, [$regex, $from, $to];
    }
    elsif ($ARGV[0] eq '--renamed') {
	fatal "Malformed command-line option $ARGV[0]; run $progname --help for more info"
	    unless @ARGV >= 3;
	shift @ARGV;

	my $from = shift;
	my $to   = shift;
	$renamed{$from} = $to;
    }
    elsif ($ARGV[0] eq '--exclude') {
	fatal "Malformed command-line option $ARGV[0]; run $progname --help for more info"
	    unless @ARGV >= 2;
	shift @ARGV;

	my $exclude = shift;
	push @excludes, $exclude;
    }
    elsif ($ARGV[0] =~ s/^--exclude=//) {
	my $exclude = shift;
	push @excludes, $exclude;
    }
    elsif ($ARGV[0] eq '--controlfiles') {
	fatal "Malformed command-line option $ARGV[0]; run $progname --help for more info"
	    unless @ARGV >= 2;
	shift @ARGV;

	$controlfiles = shift;
    }
    elsif ($ARGV[0] =~ s/^--controlfiles=//) {
	$controlfiles = shift;
    }
    elsif ($ARGV[0] =~ /^(--dirs|-d)$/) { $ignore_dirs = 0; shift; }
    elsif ($ARGV[0] eq '--nodirs') { $ignore_dirs = 1; shift; }
    elsif ($ARGV[0] =~ /^(--quiet|-q)$/) { $quiet = 1; shift; }
    elsif ($ARGV[0] =~ /^(--show-moved|-s)$/) { $show_moved = 1; shift; }
    elsif ($ARGV[0] eq '--noshow-moved') { $show_moved = 0; shift; }
    elsif ($ARGV[0] eq '--nocontrol') { $compare_control = 0; shift; }
    elsif ($ARGV[0] eq '--control') { $compare_control = 1; shift; }
    elsif ($ARGV[0] eq '--from') { $type = 'debs'; last; }
    elsif ($ARGV[0] =~ /^--w([plt])$/) { $wdiff_opt = "-$1"; shift; }
    elsif ($ARGV[0] =~ /^(--ignore-space|-w)$/) {
	push @diff_opts, "-w";
	shift;
    }
    elsif ($ARGV[0] eq '--diffstat') { $show_diffstat = 1; shift; }
    elsif ($ARGV[0] =~ /^--no-?diffstat$/) { $show_diffstat = 0; shift; }
    elsif ($ARGV[0] eq '--wdiff-source-control') { $wdiff_source_control = 1; shift; }
    elsif ($ARGV[0] =~ /^--no-?wdiff-source-control$/) { $wdiff_source_control = 0; shift; }
    elsif ($ARGV[0] eq '--auto-ver-sort') { $auto_ver_sort = 1; shift; }
    elsif ($ARGV[0] =~ /^--no-?auto-ver-sort$/) { $auto_ver_sort = 0; shift; }
    elsif ($ARGV[0] eq '--unpack-tarballs') { $unpack_tarballs = 1; shift; }
    elsif ($ARGV[0] =~ /^--no-?unpack-tarballs$/) { $unpack_tarballs = 0; shift; }
    elsif ($ARGV[0] =~ /^--no-?conf$/) {
	fatal "--no-conf is only acceptable as the first command-line option!";
    }

    # Not a recognised option
    elsif ($ARGV[0] =~ /^-/) {
	fatal "Unrecognised command-line option $ARGV[0]; run $progname --help for more info";
    }
    else {
	# End of command line options
	last;
    }
}

my $guessed_version = 0;

# If no file is given, assume that we are in a source directory
# and try to create a diff with the previous version
if(@ARGV == 0) {
    my $namepat = qr/[-+0-9a-z.]/i;

    fatal "Can't read file: debian/changelog" unless -r "debian/changelog";
    open CHL, "debian/changelog";
    while(<CHL>) {
	if(/^(\w$namepat*)\s\((\d+:)?(.+)\)((\s+$namepat+)+)\;\surgency=.+$/) {
	    unshift @ARGV, "../".$1."_".$3.".dsc";
	    $guessed_version++;
	}
	last if $guessed_version > 1;
    }
    close CHL;
}

if (! $type) {
    # we need 2 deb files or changes files to compare
    fatal "Need exactly two deb files or changes files to compare"
	unless @ARGV == 2;

    foreach my $i (0,1) {
	fatal "Can't read file: $ARGV[$i]" unless -r $ARGV[$i];
    }

    if ($ARGV[0] =~ /\.deb$/) { $type = 'deb'; }
    elsif ($ARGV[0] =~ /\.udeb$/) { $type = 'deb'; }
    elsif ($ARGV[0] =~ /\.changes$/) { $type = 'changes'; }
    elsif ($ARGV[0] =~ /\.dsc$/) { $type = 'dsc'; }
    else {
	fatal "Could not recognise files; the names should end .deb, .udeb, .changes or .dsc";
    }
    if ($ARGV[1] !~ /\.$type$/ && ($type ne 'deb' || $ARGV[1] !~ /\.udeb$/)) {
	fatal "The two filenames must have the same suffix, either .deb, .udeb, .changes or .dsc";
    }
}

# We collect up the individual deb information in the hashes
# %deb1 and %deb2, each key of which is a .deb name and each value is
# a list ref.  Note we need to use our, not my, as we will be symbolically
# referencing these variables
my @CommonDebs = ();
my @singledeb;
our (%debs1, %debs2, %files1, %files2, @D1, @D2, $dir1, $dir2, %DebPaths1, %DebPaths2);

if ($type eq 'deb') {
    no strict 'refs';
    foreach my $i (1,2) {
	my $deb = shift;
	my ($debc, $debI) = ('', '');
	my %dpkg_env = ( LC_ALL => 'C' );
	eval {
	    spawn(exec => ['dpkg-deb', '-c', $deb],
		env => \%dpkg_env,
		to_string => \$debc,
		wait_child => 1);
	};
	if ($@) {
	    fatal "dpkg-deb -c $deb failed!";
	}

	eval {
	    spawn(exec => ['dpkg-deb', '-I', $deb],
		env => \%dpkg_env,
		to_string => \$debI,
		wait_child => 1);
	};
	if ($@) {
	    fatal "dpkg-deb -I $deb failed!";
	}
	# Store the name for later
	$singledeb[$i] = $deb;
	# get package name itself
	$deb =~ s,.*/,,; $deb =~ s/_.*//;
	@{"D$i"} = @{process_debc($debc,$i)};
	push @{"D$i"}, @{process_debI($debI)};
    }
}
elsif ($type eq 'changes' or $type eq 'debs') {
    # Have to parse .changes files or remaining arguments
    my $pwd = cwd;
    foreach my $i (1,2) {
	my (@debs) = ();
	if ($type eq 'debs') {
	    if (@ARGV < 2) {
		# Oops!  There should be at least --from|--to deb ...
		fatal "Missing .deb names or missing --to!  (Run debdiff -h for help)\n";
	    }
	    shift;  # get rid of --from or --to
	    while (@ARGV and $ARGV[0] ne '--to') {
		push @debs, shift;
	    }

	    # Is there only one .deb listed?
	    if (@debs == 1) {
		$singledeb[$i] = $debs[0];
	    }
	} else {
	    my $changes = shift;
	    open CHANGES, $changes
		or fatal "Couldn't open $changes: $!";
	    my $infiles = 0;
	    while (<CHANGES>) {
		last if $infiles and /^[^ ]/;
		/^Files:/ and $infiles=1, next;
		next unless $infiles;
		if (/ (\S*.u?deb)$/) {
		    my $file = $1;
		    $file !~ m,[/\x00],
			or fatal "File name contains invalid characters: $file";
		    push @debs, dirname($changes) . '/' . $file;
		}
	    }
	    close CHANGES
		or fatal "Problem reading $changes: $!";

	    # Is there only one .deb listed?
	    if (@debs == 1) {
		$singledeb[$i] = $debs[0];
	    }
	}

	foreach my $deb (@debs) {
	    no strict 'refs';
	    fatal "Can't read file: $deb" unless -r $deb;
	    my ($debc, $debI) = ('', '');
	    my %dpkg_env = ( LC_ALL => 'C' );
	    eval {
		spawn(exec => ['dpkg-deb', '-c', $deb],
		    to_string => \$debc,
		    env => \%dpkg_env,
		    wait_child => 1);
	    };
	    if ($@) {
		fatal "dpkg-deb -c $deb failed!";
	    }
	    eval {
		spawn(exec => ['dpkg-deb', '-I', $deb],
		    to_string => \$debI,
		    env => \%dpkg_env,
		    wait_child => 1);
	    };
	    if ($@) {
		fatal "dpkg-deb -I $deb failed!";
	    }
	    my $debpath = $deb;
	    # get package name itself
	    $deb =~ s,.*/,,; $deb =~ s/_.*//;
	    $deb = $renamed{$deb} if $i == 1 and exists $renamed{$deb};
	    if (exists ${"debs$i"}{$deb}) {
		warn "Same package name appears more than once (possibly due to renaming): $deb\n";
	    } else {
		${"debs$i"}{$deb} = 1;
	    }
	    ${"DebPaths$i"}{$deb} = $debpath;
	    foreach my $file (@{process_debc($debc,$i)}) {
		${"files$i"}{$file} ||= "";
		${"files$i"}{$file} .= "$deb:";
	    }
	    foreach my $control (@{process_debI($debI)}) {
		${"files$i"}{$control} ||= "";
		${"files$i"}{$control} .= "$deb:";
	    }
	}
	no strict 'refs';
	@{"D$i"} = keys %{"files$i"};
	# Go back again
	chdir $pwd or fatal "Couldn't chdir $pwd: $!";
    }
}
elsif ($type eq 'dsc') {
    # Compare source packages
    my $pwd = cwd;

    my (@origs, @diffs, @dscs, @dscformats, @versions);
    foreach my $i (1,2) {
	my $dsc = shift;
	chdir dirname($dsc)
	    or fatal "Couldn't chdir ", dirname($dsc), ": $!";

	$dscs[$i] = cwd() . '/' . basename($dsc);

	open DSC, basename($dsc) or fatal "Couldn't open $dsc: $!";

	my $infiles=0;
	while(<DSC>) {
	    if (/^Files:/) {
		$infiles=1;
		next;
	    } elsif (/^Format: (.*)$/) {
		$dscformats[$i] = $1;
	    } elsif (/^Version: (.*)$/) {
		$versions[$i - 1] = [ $1, $i ];
	    }
	    next unless $infiles;
	    last if /^\s*$/;
	    last if /^[-\w]+:/;  # don't expect this, but who knows?
	    chomp;

	    # This had better match
	    if (/^\s+[0-9a-f]{32}\s+\d+\s+(\S+)$/) {
		my $file = $1;
		$file !~ m,[/\x00],
		    or fatal "File name contains invalid characters: $file";
		if ($file =~ /\.diff\.gz$/) {
		    $diffs[$i] = cwd() . '/' . $file;
		}
		elsif ($file =~ /(?:\.orig)?\.tar\.$compression_re_file_ext$/) {
		    $origs[$i] = $file;
		}
	    } else {
		warn "Unrecognised file line in .dsc:\n$_\n";
	    }
	}

	close DSC or fatal "Problem closing $dsc: $!";
	# Go back again
	chdir $pwd or fatal "Couldn't chdir $pwd: $!";
    }

    @versions = Devscripts::Versort::versort(@versions);
    # If the versions are currently out of order, should we swap them?
    if ($auto_ver_sort and !$guessed_version and $versions[0][1] == 1) {
	foreach my $var ((\@origs, \@diffs, \@dscs, \@dscformats)) {
	    my $temp = @{$var}[1];
	    @{$var}[1] = @{$var}[2];
	    @{$var}[2] = $temp;
	}
    }

    # Do we have interdiff?
    system("command -v interdiff >/dev/null 2>&1");
    my $use_interdiff = ($?==0) ? 1 : 0;
    system("command -v diffstat >/dev/null 2>&1");
    my $have_diffstat = ($?==0) ? 1 : 0;
    system("command -v wdiff >/dev/null 2>&1");
    my $have_wdiff = ($?==0) ? 1 : 0;

    my ($fh, $filename) = tempfile("debdiffXXXXXX",
				SUFFIX => ".diff",
				DIR => File::Spec->tmpdir,
				UNLINK => 1);

    # When wdiffing source control files we always fully extract both source
    # packages as it's the easiest way of getting the debian/control file,
    # particularly if the orig tar ball contains one which is patched in the
    # diffs
    if ($origs[1] eq $origs[2] and defined $diffs[1] and defined $diffs[2]
	and scalar(@excludes) == 0 and $use_interdiff and !$wdiff_source_control) {
	# same orig tar ball, interdiff exists and not wdiffing

	spawn(exec => ['interdiff', '-z', @diff_opts, $diffs[1], $diffs[2]],
	      to_file => $filename,
	      wait_child => 1);
	if ($have_diffstat and $show_diffstat) {
	    my $header = "diffstat for " . basename($diffs[1])
			    . " " . basename($diffs[2]) . "\n\n";
	    $header =~ s/\.diff\.gz//g;
	    print $header;
	    spawn(exec => ['diffstat', $filename],
		wait_child => 1);
	    print "\n";
	}

	if (-s $filename) {
	    open( INTERDIFF, '<', $filename );
	    while( <INTERDIFF> ) {
		print $_;
	    }
	    close INTERDIFF;

	    $exit_status = 1;
	}
    } else {
	# Any other situation
	if ($origs[1] eq $origs[2] and
	    defined $diffs[1] and defined $diffs[2] and
	    scalar(@excludes) == 0 and !$wdiff_source_control) {
	    warn "Warning: You do not seem to have interdiff (in the patchutils package)\ninstalled; this program would use it if it were available.\n";
	}
	# possibly different orig tarballs, or no interdiff installed,
	# or wdiffing debian/control
	our ($sdir1, $sdir2);
	mktmpdirs();
	for my $i (1,2) {
	    no strict 'refs';
	    my @opts = ('-x');
	    push (@opts, '--skip-patches') if $dscformats[$i] eq '3.0 (quilt)';
	    my $diri = ${"dir$i"};
	    eval {
		spawn(exec => ['dpkg-source', @opts, $dscs[$i]],
		      to_file => '/dev/null',
		      chdir => $diri,
		      wait_child => 1);
	    };
	    if ($@) {
		my $dir = dirname $dscs[1] if $i == 2;
		$dir = dirname $dscs[2] if $i == 1;
		cp "$dir/$origs[$i]", $diri || fatal "copy $dir/$origs[$i] $diri: $!";
		my $dscx = basename $dscs[$i];
		cp $diffs[$i], $diri || fatal "copy $diffs[$i] $diri: $!";
		cp $dscs[$i], $diri || fatal "copy $dscs[$i] $diri: $!";
		spawn(exec => ['dpkg-source', @opts, $dscx],
		      to_file => '/dev/null',
		      chdir => $diri,
		      wait_child => 1);
	    }
	    opendir DIR,$diri;
	    while ($_ = readdir(DIR)) {
		next if $_ eq '.' || $_ eq '..' || ! -d "$diri/$_";
		${"sdir$i"} = $_;
		last;
	    }
	    closedir(DIR);
	    my $sdiri = ${"sdir$i"};

	    # also unpack tarballs found in the top level source directory so we can compare their contents too
	    next unless $unpack_tarballs;
	    opendir DIR,$diri.'/'.$sdiri;

	    my $tarballs = 1;
	    while ($_ = readdir(DIR)) {
		    my $unpacked = "=unpacked-tar" . $tarballs . "=";
		    my $filename = $_;
		    if ($filename =~ s/\.tar\.$compression_re_file_ext$//) {
			my $comp = compression_guess_from_filename($_);
			$tarballs++;
			spawn(exec => ['tar', "--$comp", '-xf', $_],
			      to_file => '/dev/null',
			      wait_child => 1,
			      chdir => "$diri/$sdiri",
			      nocheck => 1);
			if (-d "$diri/$sdiri/$filename") {
			    move "$diri/$sdiri/$filename", "$diri/$sdiri/$unpacked";
			}
		    }
	    }
	    closedir(DIR);
	}

	my @command = ("diff", "-Nru", @diff_opts);
	for my $exclude (@excludes) {
	    push @command, ("--exclude", $exclude);
	}
	push @command, ("$dir1/$sdir1", "$dir2/$sdir2");

	# Execute diff and remove the common prefixes $dir1/$dir2, so the patch can be used with -p1,
	# as if when interdiff would have been used:
	spawn(exec => \@command, to_file => $filename, wait_child => 1, nocheck => 1);

	if ($have_diffstat and $show_diffstat) {
	    print "diffstat for $sdir1 $sdir2\n\n";
	    spawn(exec => ['diffstat', $filename],
		wait_child => 1);
	    print "\n";
	}

	if ($have_wdiff and $wdiff_source_control) {
	    # Abuse global variables slightly to create some temporary directories
	    my $tempdir1 = $dir1;
	    my $tempdir2 = $dir2;
	    mktmpdirs();
	    our $wdiffdir1 = $dir1;
	    our $wdiffdir2 = $dir2;
	    $dir1 = $tempdir1;
	    $dir2 = $tempdir2;
	    our @cf;
	    if ($controlfiles eq 'ALL') {
		@cf = ('control');
	    } else {
		@cf = split /,/, $controlfiles;
	    }

	    no strict 'refs';
	    for my $i (1,2) {
		foreach my $file (@cf) {
		    cp ${"dir$i"}.'/'.${"sdir$i"}."/debian/$file", ${"wdiffdir$i"};
		}
	    }
	    use strict 'refs';

	    # We don't support "ALL" for source packages as that would
	    # wdiff debian/*
	    $exit_status = wdiff_control_files($wdiffdir1, $wdiffdir2, $dummyname,
		$controlfiles eq 'ALL' ? 'control' : $controlfiles,
		$exit_status);
	    print "\n";

	    # Clean up
	    rmtree([$wdiffdir1, $wdiffdir2]);
	}

	if (! -f $filename) {
	    fatal "Creation of diff file $filename failed!";
	} elsif (-s $filename) {
	    open( DIFF, '<', $filename ) or fatal "Opening diff file $filename failed!";

	    while(<DIFF>) {
		s/^--- $dir1\//--- /;
		s/^\+\+\+ $dir2\//+++ /;
		s/^(diff .*) $dir1\/\Q$sdir1\E/$1 $sdir1/;
		s/^(diff .*) $dir2\/\Q$sdir2\E/$1 $sdir2/;
		print;
	    }
	    close DIFF;

	    $exit_status = 1;
	}
    }

    exit $exit_status;
}
else {
    fatal "Internal error: \$type = $type unrecognised";
}


# Compare
# Start by a piece of common code to set up the @CommonDebs list and the like

my (@deblosses, @debgains);

{
    my %debs;
    grep $debs{$_}--, keys %debs1;
    grep $debs{$_}++, keys %debs2;

    @deblosses = sort grep $debs{$_} < 0, keys %debs;
    @debgains  = sort grep $debs{$_} > 0, keys %debs;
    @CommonDebs= sort grep $debs{$_} == 0, keys %debs;
}

if ($show_moved and $type ne 'deb') {
    if (@debgains) {
	my $msg = "Warning: these package names were in the second list but not in the first:";
	print $msg, "\n", '-' x length $msg, "\n";
	print join("\n",@debgains), "\n\n";
    }

    if (@deblosses) {
	print "\n" if @debgains;
	my $msg = "Warning: these package names were in the first list but not in the second:";
	print $msg, "\n", '-' x length $msg, "\n";
	print join("\n",@deblosses), "\n\n";
    }

    # We start by determining which files are in the first set of debs, the
    # second set of debs or both.
    my %files;
    grep $files{$_}--, @D1;
    grep $files{$_}++, @D2;

    my @old = sort grep $files{$_} < 0, keys %files;
    my @new = sort grep $files{$_} > 0, keys %files;
    my @same = sort grep $files{$_} == 0, keys %files;

    # We store any changed files in a hash of hashes %changes, where
    # $changes{$from}{$to} is an array of files which have moved
    # from package $from to package $to; $from or $to is '-' if
    # the files have appeared or disappeared

    my %changes;
    my @funny;  # for storing changed files which appear in multiple debs

    foreach my $file (@old) {
	my @firstdebs = split /:/, $files1{$file};
	foreach my $firstdeb (@firstdebs) {
	    push @{$changes{$firstdeb}{'-'}}, $file;
	}
    }

    foreach my $file (@new) {
	my @seconddebs = split /:/, $files2{$file};
	foreach my $seconddeb (@seconddebs) {
	    push @{$changes{'-'}{$seconddeb}}, $file;
	}
    }

    foreach my $file (@same) {
	# Are they identical?
	next if $files1{$file} eq $files2{$file};

	# Ah, they're not the same.  If the file has moved from one deb
	# to another, we'll put a note in that pair.  But if the file
	# was in more than one deb or ends up in more than one deb, we'll
	# list it separately.
	my @fdebs1 = split (/:/, $files1{$file});
	my @fdebs2 = split (/:/, $files2{$file});

	if (@fdebs1 == 1 && @fdebs2 == 1) {
	    push @{$changes{$fdebs1[0]}{$fdebs2[0]}}, $file;
	} else {
	    # two packages to one or vice versa, or something like that
	    push @funny, [$file, \@fdebs1, \@fdebs2];
	}
    }

    # This is not a very efficient way of doing things if there are
    # lots of debs involved, but since that is highly unlikely, it
    # shouldn't be much of an issue
    my $changed = 0;

    for my $deb1 (sort(keys %debs1), '-') {
	next unless exists $changes{$deb1};
	for my $deb2 ('-', sort keys %debs2) {
	    next unless exists $changes{$deb1}{$deb2};
	    my $msg;
	    if (! $changed) {
		print "[The following lists of changes regard files as different if they have\ndifferent names, permissions or owners.]\n\n";
	    }
	    if ($deb1 eq '-') {
		$msg = "New files in second set of .debs, found in package $deb2";
	    } elsif ($deb2 eq '-') {
		$msg = "Files only in first set of .debs, found in package $deb1";
	    } else {
		$msg = "Files moved from package $deb1 to package $deb2";
	    }
	    print $msg, "\n", '-' x length $msg, "\n";
	    print join("\n",@{$changes{$deb1}{$deb2}}), "\n\n";
	    $changed = 1;
	}
    }

    if (@funny) {
	my $msg = "Files moved or copied from at least TWO packages or to at least TWO packages";
	print $msg, "\n", '-' x length $msg, "\n";
	for my $funny (@funny) {
	    print $$funny[0], "\n"; # filename and details
	    print "From package", (@{$$funny[1]} > 1 ? "s" : ""), ": ";
	    print join(", ", @{$$funny[1]}), "\n";
	    print "To package", (@{$$funny[2]} > 1 ? "s" : ""), ": ";
	    print join(", ", @{$$funny[2]}), "\n";
	}
	$changed = 1;
    }

    if (! $quiet && ! $changed) {
	print "File lists identical on package level (after any substitutions)\n";
    }
    $exit_status = 1 if $changed;
} else {
    my %files;
    grep $files{$_}--, @D1;
    grep $files{$_}++, @D2;

    my @losses = sort grep $files{$_} < 0, keys %files;
    my @gains = sort grep $files{$_} > 0, keys %files;

    if (@losses == 0 && @gains == 0) {
	print "File lists identical (after any substitutions)\n"
	    unless $quiet;
    } else {
	print "[The following lists of changes regard files as different if they have\ndifferent names, permissions or owners.]\n\n";
    }

    if (@gains) {
	my $msg;
	if ($type eq 'debs') {
	    $msg = "Files in second set of .debs but not in first";
	} else {
	    $msg = sprintf "Files in second .%s but not in first",
		    $type eq 'deb' ? 'deb' : 'changes';
	}
	print $msg, "\n", '-' x length $msg, "\n";
	print join("\n",@gains), "\n";
	$exit_status = 1;
    }

    if (@losses) {
	print "\n" if @gains;
	my $msg;
	if ($type eq 'debs') {
	    $msg = "Files in first set of .debs but not in second";
	} else {
	    $msg = sprintf "Files in first .%s but not in second",
		    $type eq 'deb' ? 'deb' : 'changes';
	}
	print $msg, "\n", '-' x length $msg, "\n";
	print join("\n",@losses), "\n";
	$exit_status = 1;
    }
}

# We compare the control files (at least the dependency fields)
if (defined $singledeb[1] and defined $singledeb[2]) {
	@CommonDebs = ( $dummyname );
	$DebPaths1{$dummyname} = $singledeb[1];
	$DebPaths2{$dummyname} = $singledeb[2];
}

exit $exit_status unless (@CommonDebs > 0) and $compare_control;

unless (system ("command -v wdiff >/dev/null 2>&1") == 0) {
    warn "Can't compare control files; wdiff package not installed\n";
    exit $exit_status;
}

for my $debname (@CommonDebs) {
    no strict 'refs';
    mktmpdirs();

    for my $i (1,2) {
	my $debpath = "${\"DebPaths$i\"}{$debname}";
	my $diri = ${"dir$i"};
	eval {
	    spawn(exec => ['dpkg-deb', '-e', $debpath, $diri],
		wait_child => 1);
	};
	if ($@) {
	    my $msg = "dpkg-deb -e ${\"DebPaths$i\"}{$debname} failed!";
	    rmtree([$dir1, $dir2]);
	    fatal $msg;
	}
    }

    use strict 'refs';
    $exit_status = wdiff_control_files($dir1, $dir2, $debname, $controlfiles,
	$exit_status);

    # Clean up
    rmtree([$dir1, $dir2]);
}

exit $exit_status;

###### Subroutines

# This routine takes the output of dpkg-deb -c and returns
# a processed listref
sub process_debc($$)
{
    my ($data,$number) = @_;
    my (@filelist);

    # Format of dpkg-deb -c output:
    # permissions owner/group size date time name ['->' link destination]
    $data =~ s/^(\S+)\s+(\S+)\s+(\S+\s+){3}/$1  $2   /mg;
    $data =~ s,   \./,   /,mg;
    @filelist = grep ! m|   /$|, split /\n/, $data; # don't bother keeping '/'

    # Are we keeping directory names in our filelists?
    if ($ignore_dirs) {
	@filelist = grep ! m|/$|, @filelist;
    }

    # Do the "move" substitutions in the order received for the first debs
    if ($number == 1 and @move) {
	my @split_filelist = map { m/^(\S+)  (\S+)   (.*)/ && [$1, $2, $3] }
	    @filelist;
	for my $move (@move) {
	    my $regex = $$move[0];
	    my $from  = $$move[1];
	    my $to    = $$move[2];
	    map { if ($regex) { eval "\$\$_[2] =~ s:$from:$to:g"; }
		  else { $$_[2] =~ s/\Q$from\E/$to/; } } @split_filelist;
	}
	@filelist = map { "$$_[0]  $$_[1]   $$_[2]" } @split_filelist;
    }

    return \@filelist;
}

# This does the same for dpkg-deb -I
sub process_debI($)
{
    my ($data) = @_;
    my (@filelist);

    # Format of dpkg-deb -c output:
    # 2 (always?) header lines
    #   nnnn bytes,    nnn lines   [*]  filename    [interpreter]
    # Package: ...
    # rest of control file

    foreach (split /\n/, $data) {
	last if /^Package:/;
	next unless /^\s+\d+\s+bytes,\s+\d+\s+lines\s+(\*)?\s+([\-\w]+)/;
	my $control = $2;
	my $perms = ($1 ? "-rwxr-xr-x" : "-rw-r--r--");
	push @filelist, "$perms  root/root   DEBIAN/$control";
    }

    return \@filelist;
}

sub wdiff_control_files($$$$$)
{
    my ($dir1, $dir2, $debname, $controlfiles, $origstatus) = @_;
    return unless defined $dir1 and defined $dir2 and defined $debname
	and defined $controlfiles;
    my @cf;
    my $status = $origstatus;
    if ($controlfiles eq 'ALL') {
	# only need to list one directory as we are only comparing control
	# files in both packages
	@cf = grep { ! /md5sums/ } map { basename($_); } glob("$dir1/*");
    } else {
	@cf = split /,/, $controlfiles;
    }

    foreach my $cf (@cf) {
	next unless -f "$dir1/$cf" and -f "$dir2/$cf";
	if ($cf eq 'control' or $cf eq 'conffiles') {
	    for my $file ("$dir1/$cf", "$dir2/$cf") {
		my ($fd, @hdrs);
		open $fd, '<', $file or fatal "Cannot read $file: $!";
		while (<$fd>) {
		    if (/^\s/ and @hdrs > 0) {
			$hdrs[$#hdrs] .= $_;
		    } else {
			push @hdrs, $_;
		    }
		}
		close $fd;
		open $fd, '>', $file or fatal "Cannot write $file: $!";
		print $fd sort @hdrs;
		close $fd;
	    }
	}
	my $usepkgname = $debname eq $dummyname ? "" : " of package $debname";
	my @opts = ('-n');
	push @opts, $wdiff_opt if $wdiff_opt;
	my $wdiff = '';
	eval {
	    spawn(exec => ['wdiff', @opts, "$dir1/$cf", "$dir2/$cf"],
		to_string => \$wdiff,
		wait_child => 1);
	};
	if ($@ and $@ !~ /gave error exit status 1/) {
	    print "$@\n";
	    warn "wdiff failed\n";
	} else {
	    if (!$@) {
		if (! $quiet) {
		    print "\nNo differences were encountered between the $cf files$usepkgname\n";
		}
	    } elsif ($wdiff_opt) {
		# Don't try messing with control codes
		my $msg = ucfirst($cf) . " files$usepkgname: wdiff output";
		print "\n", $msg, "\n", '-' x length $msg, "\n";
		print $wdiff;
	    } else {
		my @output;
		@output = split /\n/, $wdiff;
		@output = grep /(\[-|\{\+)/, @output;
		my $msg = ucfirst($cf) . " files$usepkgname: lines which differ (wdiff format)";
		print "\n", $msg, "\n", '-' x length $msg, "\n";
		print join("\n",@output), "\n";
	    }
	    $status = 1;
	}
    }

    return $status;
}

sub mktmpdirs ()
{
    no strict 'refs';

    for my $i (1,2) {
	${"dir$i"}=tempdir( CLEANUP => 1 );
	fatal "Couldn't create temp directory"
	    if not defined ${"dir$i"};
    }
}

sub fatal(@)
{
    my ($pack,$file,$line);
    ($pack,$file,$line) = caller();
    (my $msg = "$progname: fatal error at line $line:\n@_\n") =~ tr/\0//d;
    $msg =~ s/\n\n$/\n/;
    die $msg;
}