This file is indexed.

/usr/bin/pg_upgradecluster is in postgresql-common 181+deb9u2.

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
#!/usr/bin/perl -wT

# Upgrade a PostgreSQL cluster to a newer major version.
#
# (C) 2005-2009 Martin Pitt <mpitt@debian.org>
# (C) 2013 Peter Eisentraut <petere@debian.org>
# (C) 2013-2016 Christoph Berg <myon@debian.org>
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  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 strict;
use warnings;
use PgCommon;
use Getopt::Long;
use POSIX qw(lchown);

# untaint environment
$ENV{'PATH'} = '/bin:/usr/bin';
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

# global variables
my ($version, $newversion, $cluster, $newcluster);
my (%info, %newinfo);
my ($encoding, $old_lc_ctype, $old_lc_collate); # old cluster encoding

# do not trip over cwd not being accessible to postgres superuser
chdir '/';

# update the new cluster's conffiles
sub adapt_conffiles {
    my %c = read_cluster_conf_file $newversion, $newcluster, 'postgresql.conf';

    # Arguments: <ref to conf hash> <name> <comment>
    sub deprecate {
        if (defined ${$_[0]}{$_[1]}) {
            PgCommon::disable_conf_value $newversion, $newcluster,
                'postgresql.conf', $_[1], $_[2];
        }
    }

    # Arguments: <ref to conf hash> <old name> <new name>
    sub rename_ {
        my ($conf, $old, $new) = @_;
        if (defined ${$conf}{$old}) {
            PgCommon::replace_conf_value $newversion, $newcluster,
                'postgresql.conf', $old, "deprecated in favor of $new", 
                $new, ${$conf}{$old};
        }
    }

    # Arguments: <config option> <value>
    sub set {
        my ($guc, $val) = @_;
        PgCommon::set_conf_value $newversion, $newcluster, 'postgresql.conf',
            $guc, $val;
    }

    # adapt paths to configuration files
    set 'data_directory', $newinfo{'pgdata'};
    for my $guc (qw(hba_file ident_file external_pid_file stats_temp_directory)) {
        next unless (defined $c{$guc});
        my $val = $c{$guc};
        $val =~ s/\b\Q$version\E\b/$newversion/g;
        $val =~ s/\b\Q$cluster\E\b/$newcluster/g if ($cluster ne $newcluster);
        set $guc, $val;
    }

    if ($newversion >= '8.2') {
        # preload_libraries -> shared_preload_libraries transition
        rename_ \%c, 'preload_libraries', 'shared_preload_libraries';

	# australian_timezones -> timezone_abbreviations transition
	my $australian_timezones = config_bool $c{'australian_timezones'};
	if (defined $australian_timezones) {
	    PgCommon::replace_conf_value $newversion, $newcluster, 'postgresql.conf',
		    'australian_timezones', 'deprecated in favor of timezone_abbreviations', 
		    'timezone_abbreviations', ($australian_timezones ?  'Australia' : 'Default');
	}
    }

    if ($newversion >= '8.3') {
        deprecate \%c, 'bgwriter_lru_percent', 'deprecated';
        deprecate \%c, 'bgwriter_all_percent', 'deprecated';
        deprecate \%c, 'bgwriter_all_maxpages', 'deprecated';

        rename_ \%c, 'redirect_stderr', 'logging_collector';

        rename_ \%c, 'stats_command_string', 'track_activities';
        deprecate \%c, 'stats_start_collector', 'deprecated, always on now';
        deprecate \%c, 'stats_reset_on_server_start', 'deprecated';

	# stats_block_level and stats_row_level are merged into track_counts
	if ($c{'stats_block_level'} || $c{'stats_row_level'}) {
	    deprecate \%c, 'stats_block_level', 'deprecated in favor of track_counts';
	    deprecate \%c, 'stats_row_level', 'deprecated in favor of track_counts';
            set 'track_counts', (config_bool $c{'stats_block_level'} || config_bool $c{'stats_row_level'}) ? 'on' : 'off';
	}

        # archive_command now has to be enabled explicitly
        if ($c{'archive_command'}) {
            set 'archive_mode', 'on';
        }
    }

    if ($newversion >= '8.4') {
        deprecate \%c, 'max_fsm_pages', 'not needed anymore';
        deprecate \%c, 'max_fsm_relations', 'not needed anymore';
        deprecate \%c, 'krb_server_hostname', 'does not exist anymore';
        deprecate \%c, 'krb_realm', 'does not exist anymore';
        rename_ \%c, 'explain_pretty_print', 'debug_pretty_print';

	# "ident sameuser" -> "ident"
	my $hba = "$PgCommon::confroot/$newversion/$newcluster/pg_hba.conf";
	open O, $hba or error "open $hba: $!";
	open N, ">$hba.new" or error "open $hba.new: $!";
	while (<O>) {
	    s/ident sameuser/ident/;
	    print N $_;
	}
	close O;
	close N;
	lchown $newinfo{'owneruid'}, $newinfo{'ownergid'}, "$hba.new";
	chmod 0640, "$hba.new";
	rename "$hba.new", $hba or error "rename: $!";
    }

    if ($newversion >= '9.0') {
	deprecate \%c, 'add_missing_from', 'does not exist anymore';
	deprecate \%c, 'regex_flavor', 'does not exist anymore';
    }

    if ($newversion >= '9.2') {
	deprecate \%c, 'wal_sender_delay', 'does not exist anymore';
	deprecate \%c, 'silent_mode', 'does not exist anymore';
	deprecate \%c, 'custom_variable_classes', 'does not exist anymore';

        # SSL certificate paths have an explicit option now, older versions use
        # a symlink
	for my $f (['server.crt', 'ssl_cert_file'],
		   ['server.key', 'ssl_key_file'],
		   ['root.crt', 'ssl_ca_file'],
		   ['root.crl', 'ssl_crl_file']) {
	    my $file = "$newinfo{'pgdata'}/$f->[0]";
	    if (-l $file) { # migrate symlink to config entry with link target
                set $f->[1], (readlink $file);
		unlink $file;
	    } elsif (-e $file) { # plain file in data dir, put in config
                set $f->[1], $file;
	    }
	}
    }

    if ($newversion >= '9.3') {
        rename_ \%c, 'unix_socket_directory', 'unix_socket_directories';
        rename_ \%c, 'replication_timeout', 'wal_sender_timeout';
    }

    if ($newversion >= '9.4') {
        deprecate \%c, 'krb_srvname', 'native krb5 authentication deprecated in favor of GSSAPI';
        # grab dsmt from the new config just written by initdb
        unless ($c{dynamic_shared_memory_type}) {
            set 'dynamic_shared_memory_type', ($newinfo{dynamic_shared_memory_type} || 'mmap');
        }
    }

    if ($newversion >= '9.5') {
        if ($c{checkpoint_segments}) {
            my $max_wal_size = 16*$c{checkpoint_segments} . 'MB';
            rename_ \%c, 'checkpoint_segments', 'max_wal_size';
            set 'max_wal_size', $max_wal_size;
        }
        deprecate \%c, 'ssl_renegotiation_limit', 'does not exist anymore';
        # adapt cluster_name
        my $cluster_name = PgCommon::get_conf_value ($newversion, $newcluster, 'postgresql.conf', 'cluster_name');
        if ($cluster_name) {
            $cluster_name =~ s/\Q$version\E/$newversion/g;
            $cluster_name =~ s/\Q$cluster\E/$newcluster/g;
            set 'cluster_name', $cluster_name;
        }
    }
}

# Save original pg_hba.conf, replace it with one that only allows local access
# to the owner. Database must be reloaded manually if it is running.
# Arguments: <version> <cluster> <owner> <owneruid>
sub disable_connections {
    my $hba = "$PgCommon::confroot/$_[0]/$_[1]/pg_hba.conf";

    return if (-e "$hba.pg_upgradecluster"); # leftover from a previous upgrade
		# attempt, do not rename again so we do not lose the original
    rename $hba, "$hba.pg_upgradecluster" or error "could not rename $hba: $!";
    unless (open F, ">$hba") {
        rename "$hba.pg_upgradecluster", $hba;
        error "could not create $hba";
    }
    chmod 0400, $hba;
    lchown $_[3], 0, $hba;
    if ($_[0] >= '8.4') {
	print F "local all $_[2] ident\n";
    } else {
	print F "local all $_[2] ident sameuser\n";
    }
    close F;
}

# Restore original pg_hba.conf, but do not restart postgres.
# Arguments: <version> <cluster>
sub enable_connections {
    my $hba = "$PgCommon::confroot/$_[0]/$_[1]/pg_hba.conf";

    rename "$hba.pg_upgradecluster", $hba or error "could not rename $hba.pg_upgradecluster: $!"
	if (-e "$hba.pg_upgradecluster");
}

# Get encoding and locales of a running cluster
# Arguments: <version> <cluster>
sub get_encoding {
    my ($version, $cluster) = @_;
    $encoding = get_db_encoding $version, $cluster, 'template1';
    if ($version <= '8.3') {
	($old_lc_ctype, $old_lc_collate) = get_cluster_locales $version, $cluster;
    } else {
	($old_lc_ctype, $old_lc_collate) = get_db_locales $version, $cluster, 'template1';
    }
    unless ($encoding && $old_lc_ctype && $old_lc_collate) {
	error 'could not get cluster locales';
    }
}

# RedHat's run-parts doesn't support any options, supply a minimalistic implementation here
# BUG: we don't care about validating the filenames yet
# Arguments: <directory> <argv to pass to scripts>
sub run_parts {
    my ($dir, @argv) = @_;
    for my $script (<$dir/*>) {
        my ($s) = $script =~ /(.*)/; # untaint
        system ($s, @argv);
        error "$s failed: $?" if ($?);
    }
}


#
# Execution starts here
#

# command line arguments

my $newest_version = get_newest_version;
$newversion = $newest_version;

my $method = 'dump';
my $link = 0;

my ($locale, $lc_collate, $lc_ctype, $lc_messages, $lc_monetary, $lc_numeric,
    $lc_time, $logfile, $old_bindir);
GetOptions ('v|version=s' => \$newversion,
	    'locale=s' => \$locale,
	    'lc-collate=s' => \$lc_collate,
	    'lc-ctype=s' => \$lc_ctype,
	    'lc-messages=s' => \$lc_messages,
	    'lc-monetary=s' => \$lc_monetary,
	    'lc-numeric=s' => \$lc_numeric,
	    'lc-time=s' => \$lc_time,
	    'logfile=s' => \$logfile,
	    'm|method=s' => \$method,
	    'k|link' => \$link,
            'rename=s' => \$newcluster,
            'old-bindir=s' => \$old_bindir,
    ) or exit 1;

$method eq 'dump' or $method eq 'upgrade' or error 'method must be "dump" or "upgrade"';
$link and $method eq 'dump' and error 'cannot use --link with --method=dump';

# untaint
($newversion) = $newversion =~ /^(\d+\.?\d+)$/;
($locale) = $locale =~ /^([\w@._-]+)$/ if $locale;
($lc_collate) = $lc_collate =~ /^([\w@._-]+)$/ if $lc_collate;
($lc_ctype) = $lc_ctype =~ /^([\w@._-]+)$/ if $lc_ctype;
($lc_messages) = $lc_messages =~ /^([\w@._-]+)$/ if $lc_messages;
($lc_monetary) = $lc_monetary =~ /^([\w@._-]+)$/ if $lc_monetary;
($lc_numeric) = $lc_numeric =~ /^([\w@._-]+)$/ if $lc_numeric;
($lc_time) = $lc_time =~ /^([\w@._-]+)$/ if $lc_time;
($logfile) = $logfile =~ /^([^\n]+)$/ if $logfile;
($old_bindir) = $old_bindir =~ /^(\/.*)$/ if $old_bindir;

if ($#ARGV < 1) {
    print "Usage: $0 [OPTIONS] <old version> <cluster name> [<new data directory>]\n";
    exit 1;
}

($version) = $ARGV[0] =~ /^(\d+\.?\d+)$/;
($cluster) = $ARGV[1] =~ /^([-.\w]+)$/;
$newcluster ||= $cluster; # use old cluster name by default
($newcluster) = $newcluster =~ /^([-.\w]+)$/;
my $datadir;
($datadir) = $ARGV[2] =~ /(.*)/ if defined $ARGV[2];

error 'specified cluster does not exist' unless cluster_exists $version, $cluster;
%info = cluster_info ($version, $cluster);
error 'cluster is disabled' if $info{'start'} eq 'disabled';

error "cluster $version/$cluster is already on version $newversion. " .
    "(The newest version installed on this system is $newest_version.)"
    if ($version eq $newversion and $cluster eq $newcluster);

if (cluster_exists $newversion, $newcluster) {
    error "target cluster $newversion/$newcluster already exists";
}

my $oldcontrol = get_cluster_controldata ($version, $cluster);

my $oldpsql = get_program_path 'psql', $version;
my $oldsocket = get_cluster_socketdir $version, $cluster;
my $owner = getpwuid $info{'owneruid'};
error 'could not get name of cluster owner' unless $owner;
my $old_hba_modified;

# stopping old cluster, so that we notice early when there are still
# connections
if ($info{'running'}) {
    get_encoding $version, $cluster;
    print "Stopping old cluster...\n";
    my @argv = ('pg_ctlcluster', $version, $cluster, 'stop', '--');
    push @argv, ('-t', '5') if $version >= '8.4';
    error "Could not stop old cluster" if system @argv;
}

if ($method eq 'dump' or ($method eq 'upgrade' and not $info{'running'})) {
    # Disable access to cluster during upgrade
    print "Disabling connections to the old cluster during upgrade...\n";
    disable_connections $version, $cluster, $owner, $info{'owneruid'};
    $old_hba_modified = 1;

    print "Restarting old cluster with restricted connections...\n";
    my @argv = ('pg_ctlcluster',
        ($old_bindir ? ("--bindir=$old_bindir") : ()),
        $version, $cluster, 'start');
    error "Could not restart old cluster" if system @argv;

    get_encoding $version, $cluster unless ($encoding); # if the cluster was not running before, get encoding now

    if ($method eq 'upgrade') {
	print "Stopping old cluster...\n";
	@argv = ('pg_ctlcluster', $version, $cluster, 'stop', '--');
	push @argv, ('-t', '5') if $version >= '8.4';
	error "Could not stop old cluster" if system @argv;
    }
}

# in dump mode, old cluster is running now
# in upgrade mode, old cluster is stopped

# create new cluster, preserving encoding and locales
my @argv = ('pg_createcluster', '-u', $info{'owneruid'}, '-g', $info{'ownergid'},
    '--socketdir', $info{'socketdir'}, $newversion,
    $newcluster);

push @argv, ('--datadir', $datadir) if $datadir;
push @argv, ('--logfile', $logfile) if $logfile;
push @argv, ('--encoding', $encoding) unless $locale or $lc_ctype;
$lc_ctype ||= $locale || $old_lc_ctype;
$lc_collate ||= $locale || $old_lc_collate;
push @argv, ('--locale', $locale) if $locale;
push @argv, ('--lc-collate', $lc_collate) if $lc_collate;
push @argv, ('--lc-ctype', $lc_ctype) if $lc_ctype;
push @argv, ('--lc-messages', $lc_messages) if $lc_messages;
push @argv, ('--lc-monetary', $lc_monetary) if $lc_monetary;
push @argv, ('--lc-numeric', $lc_numeric) if $lc_numeric;
push @argv, ('--lc-time', $lc_time) if $lc_time;
delete $ENV{'LC_ALL'};
push @argv, ('--', '--data-checksums') if $oldcontrol->{'Data page checksum version'}; # 0 = off
error "Could not create target cluster" if system @argv;

%newinfo = cluster_info($newversion, $newcluster);

if ($method eq 'dump') {
    print "Disabling connections to the new cluster during upgrade...\n";
    disable_connections $newversion, $newcluster, $owner, $newinfo{'owneruid'};

    @argv = ('pg_ctlcluster', $newversion, $newcluster, 'start');
    error "Could not start target cluster" if system @argv;
}

sleep(4);

my $pg_restore = get_program_path 'pg_restore', $newversion;

# check whether upgrade scripts exist; if so, verify that pg_restore supports
# -X no-data-for-failed-tables.
my $upgrade_scripts = (-d "$PgCommon::common_confdir/pg_upgradecluster.d" &&
     ($PgCommon::rpm ? `ls $PgCommon::common_confdir/pg_upgradecluster.d` :
         `run-parts --test $PgCommon::common_confdir/pg_upgradecluster.d`));

if ($upgrade_scripts) {
    if (`$pg_restore --help` !~ qr/no-data-for-failed-tables/) {
	error "$PgCommon::common_confdir/pg_upgradecluster.d has upgrade scripts, but $pg_restore does not support the \"-X no-data-for-failed-tables\" option."
    }
}

# Run upgrade scripts in init phase
if ($upgrade_scripts) {
    print "Running <init> phase upgrade hook scripts...\n";
    if (!fork) {
	change_ugid $info{'owneruid'}, $info{'ownergid'};

        if ($PgCommon::rpm) {
            run_parts ("$PgCommon::common_confdir/pg_upgradecluster.d",
                $version, $newcluster, $newversion, 'init');
            exit;
        }

	@argv = ('run-parts', '--lsbsysinit', '-a', $version, '-a', $newcluster,
	    '-a', $newversion, '-a', 'init',
	    "$PgCommon::common_confdir/pg_upgradecluster.d");
	error "$PgCommon::common_confdir/pg_upgradecluster.d script failed" if system @argv;
        exit 0;
    }
    wait;
    if ($?) {
        print STDERR "Error during running upgrade hooks, removing new cluster\n";
        system 'pg_dropcluster', '--stop', $newversion, $newcluster;
        exit 1;
    }
}

# dump cluster; drop to cluster owner privileges

if (!fork) {
    change_ugid $info{'owneruid'}, $info{'ownergid'};
    my $pg_dumpall = get_program_path 'pg_dumpall', $newversion;
    my $pg_dump = get_program_path 'pg_dump', $newversion;
    my $psql = get_program_path 'psql', $newversion;
    my $newsocket = get_cluster_socketdir $newversion, $newcluster;

    if ($method eq 'dump') {
	# get list of databases (value = datallowconn)
	my %databases;
	open F, '-|', $oldpsql, '-h', $oldsocket, '-p', $info{'port'}, 
	    '-F|', '-d', 'template1', '-Atc', 
	    'SELECT datname, datallowconn FROM pg_database' or
	    error 'Could not get pg_database list';
	while (<F>) {
	    chomp;
	    my ($n, $a) = split '\|';
	    $databases{$n} = ($a eq 't');
	}
	close F;
	error 'could not get list of databases' if $?;

	# Temporarily enable access to all DBs, so that we can upgrade them
	for my $db (keys %databases) {
	    next if $db eq 'template0';

	    unless ($databases{$db}) {
		print "Temporarily enabling access to database $db\n";
		(system $oldpsql, '-h', $oldsocket, '-p', $info{'port'}, '-q', 
		    '-d', 'template1', '-c', 
		    "BEGIN READ WRITE; UPDATE pg_database SET datallowconn = 't' WHERE datname = '$db'; COMMIT") == 0 or
		    error 'Could not enable access to database';
	    }
	}

	# dump schemas
	print "Roles, databases, schemas, ACLs...\n";
	open SOURCE, '-|', $pg_dumpall, '-h', $oldsocket, '-p', $info{'port'},
	     '-s', '--quote-all-identifiers' or error 'Could not execute pg_dumpall for old cluster';
	my $data = '';
        my $buffer;
	while (read SOURCE, $buffer, 1048576) {
	    $data .= $buffer;
	}
	close SOURCE;
	($? == 0) or exit 1;

	# remove creation of db superuser role to avoid error message
	$data =~ s/^CREATE (ROLE|USER) "\Q$owner\E";\s*$//m;

	# create global objects in target cluster
	open SINK, '|-', $psql, '-h', $newsocket, '-p', $newinfo{'port'},
	    '-q', '-d', 'template1' or 
	    error 'Could not execute psql for new cluster';

	# ensure that we can upgrade tables for DBs with default read-only
	# transactions
	print SINK "BEGIN READ WRITE; ALTER USER $owner SET default_transaction_read_only to off; COMMIT;\n";

	print SINK $data;

	close SINK;
	($? == 0) or exit 1;

	
	# Upgrade databases
	for my $db (keys %databases) {
	    next if $db eq 'template0';

	    print "Fixing hardcoded library paths for stored procedures...\n";
	    # starting from 9.0, replace() works on strings; for earlier versions it
	    # works on bytea
	    if ($version >= '9.0') {
		(system $psql, '-h', $oldsocket, '-p', $info{'port'}, '-q', '-d',
		    $db, '-c', "BEGIN READ WRITE; \
			UPDATE pg_proc SET probin = replace(\
			replace(probin, '/usr/lib/postgresql/lib', '\$libdir'), \
			'/usr/lib/postgresql/$version/lib', '\$libdir'); COMMIT") == 0 or
		    error 'Could not fix library paths';
	    } else {
		(system $psql, '-h', $oldsocket, '-p', $info{'port'}, '-q', '-d',
		    $db, '-c', "BEGIN READ WRITE; \
			UPDATE pg_proc SET probin = decode(replace(\
		       replace(encode(probin, 'escape'), '/usr/lib/postgresql/lib', '\$libdir'), \
		       '/usr/lib/postgresql/$version/lib', '\$libdir'), 'escape'); COMMIT") == 0 or
		    error 'Could not fix library paths';
	    }

	    print 'Upgrading database ', $db, "...\n";
	    open SOURCE, '-|', $pg_dump, '-h', $oldsocket, '-p', $info{'port'},
		 '-Fc', '--quote-all-identifiers', $db or 
		error 'Could not execute pg_dump for old cluster';

	    # start pg_restore and copy over everything
	    my @restore_argv = ($pg_restore, '-h', $newsocket, '-p',
		$newinfo{'port'}, '--data-only', '-d', $db);

	    if ($newversion >= '8.3') {
		push @restore_argv, '--disable-triggers';
	    }

	    if ($upgrade_scripts) {
		push @restore_argv, '--no-data-for-failed-tables';
	    }
	    open SINK, '|-', @restore_argv or
		error 'Could not execute pg_restore for new cluster';

            my $buffer;
	    while (read SOURCE, $buffer, 1048576) {
		print SINK $buffer;
	    }
	    close SOURCE;
	    ($? == 0) or exit 1;
	    close SINK;

	    # clean up
	    print 'Analyzing database ', $db, "...\n";
	    (system $psql, '-h', $newsocket, '-p', $newinfo{'port'}, '-q', 
		'-d', $db, '-c', 'ANALYZE') == 0 or
		error 'Could not ANALYZE database';

	    unless ($databases{$db}) {
		print "Disabling access to database $db again\n";
		(system $oldpsql, '-h', $oldsocket, '-p', $info{'port'}, '-q', 
		    '-d', 'template1', '-c', 
		    "BEGIN READ WRITE; UPDATE pg_database SET datallowconn = 'f' where datname = '$db'; COMMIT") == 0 or
		    error 'Could not disable access to database in old cluster';
		(system $psql, '-h', $newsocket, '-p', $newinfo{'port'}, '-q', 
		    '-d', 'template1', '-c', 
		    "BEGIN READ WRITE; UPDATE pg_database SET datallowconn = 'f' where datname = '$db'; COMMIT") == 0 or
		    error 'Could not disable access to database in new cluster';
	    }
	}

	# reset owner specific override for default read-only transactions
	(system $psql, '-h', $newsocket, '-p', $newinfo{'port'}, '-q', 'template1', '-c', 
	    "BEGIN READ WRITE; ALTER USER $owner RESET default_transaction_read_only; COMMIT;\n") == 0 or
	    error 'Could not reset default_transaction_read_only value for superuser';
    } else {
	# pg_upgrade

	use File::Temp qw(tempdir);

	my $pg_upgrade = get_program_path 'pg_upgrade', $newversion;
        $pg_upgrade or error "pg_upgrade $newversion not found";
	my @argv = ($pg_upgrade,
		 '-b', ($old_bindir || "$PgCommon::binroot$version/bin"),
		 '-B', "$PgCommon::binroot$newversion/bin",
		 '-d', $info{'pgdata'},
		 '-D', $newinfo{'pgdata'},
		 '-p', $info{'port'},
		 '-P', $newinfo{'port'},
	    );
	push @argv, "--link" if $link;

	# Make a directory for pg_upgrade to store its reports and log
	# files.  It will not be removed.
	my $logdir = tempdir("/var/log/postgresql/pg_upgradecluster-$version-$newversion-$newcluster.XXXX");
	chdir $logdir;

	# pg_upgrade doesn't support separate configuration and data
	# directories, so we must fix this up temporarily.  (In 9.2+,
	# this could be done with the pg_upgrade -o/-O options (see
	# man page), but we want to support some earlier versions as
	# well for a while.)
	foreach my $file ('postgresql.conf', 'pg_hba.conf', 'pg_ident.conf') {
	    -l "$info{pgdata}/$file" or
		symlink("$info{configdir}/$file", "$info{pgdata}/$file") or
		error "could not create symlink $info{pgdata}/$file";
	    -l "$newinfo{pgdata}/$file" or
		symlink("$newinfo{configdir}/$file", "$newinfo{pgdata}/$file") or
		error "could not create symlink $newinfo{pgdata}/$file";
	}
	# Run pg_upgrade.
	my $status = system @argv;
	# And remove the temporary configuration files again.
	foreach my $file ('postgresql.conf', 'pg_hba.conf', 'pg_ident.conf') {
	    unlink($newinfo{'pgdata'}."/$file");
	}
	# Remove the PID file of the old cluster (normally removed by
	# pg_ctlcluster, but not by pg_upgrade).
	unlink "/var/run/postgresql/$version-$cluster.pid";

	$status == 0 or error "pg_upgrade run failed. Logfiles are in $logdir";
        print "pg_upgrade output scripts are in $logdir\n";
    }

    exit 0;
}

wait;
if ($old_hba_modified) {
    print "Re-enabling connections to the old cluster...\n";
    enable_connections $version, $cluster;
}
if ($method eq 'dump') {
    print "Re-enabling connections to the new cluster...\n";
    enable_connections $newversion, $newcluster;
}

if ($?) {
    print STDERR "Error during cluster dumping, removing new cluster\n";
    system 'pg_dropcluster', '--stop', $newversion, $newcluster;

    # Reload old cluster to allow connections again
    if (system 'pg_ctlcluster', $version, $cluster, 'reload') {
        error 'could not reload old cluster, please do that manually';
    }
    exit 1;
}

# copy configuration files
print "Copying old configuration files...\n";
install_file $info{'configdir'}.'/postgresql.conf', $newinfo{'configdir'},
    $newinfo{'owneruid'}, $newinfo{'ownergid'}, "644";
install_file $info{'configdir'}.'/pg_ident.conf', $newinfo{'configdir'},
    $newinfo{'owneruid'}, $newinfo{'ownergid'}, "640";
install_file $info{'configdir'}.'/pg_hba.conf', $newinfo{'configdir'},
    $newinfo{'owneruid'}, $newinfo{'ownergid'}, "640";
if ( -e $info{'configdir'}.'/start.conf') {
    print "Copying old start.conf...\n";
    install_file $info{'configdir'}.'/start.conf', $newinfo{'configdir'},
	$newinfo{'owneruid'}, $newinfo{'ownergid'}, "644";
}
if ( -e $info{'configdir'}.'/pg_ctl.conf') {
    print "Copying old pg_ctl.conf...\n";
    install_file $info{'configdir'}.'/pg_ctl.conf', $newinfo{'configdir'},
	$newinfo{'owneruid'}, $newinfo{'ownergid'}, "644";
}
# copy SSL files (overwriting any file that pg_createcluster put there)
for my $file (qw/server.crt server.key root.crt/) {
    if ( -e "$info{'pgdata'}/$file") {
	print "Copying old $file...\n";
	if (!fork) { # we don't use install_file because that converts symlinks to files
	    change_ugid $info{'owneruid'}, $info{'ownergid'};
	    system "cp -a $info{'pgdata'}/$file $newinfo{'pgdata'}";
	    exit 0;
	}
	wait;
    }
}

adapt_conffiles $newversion, $newcluster;

if ($method eq 'dump') {
    print "Stopping target cluster...\n";
    @argv = ('pg_ctlcluster', $newversion, $newcluster, 'stop');
    error "Could not stop target cluster" if system @argv;

    print "Stopping old cluster...\n";
    @argv = ('pg_ctlcluster', $version, $cluster, 'stop');
    error "Could not stop old cluster" if system @argv;
}

print "Disabling automatic startup of old cluster...\n";
my $startconf = $info{'configdir'}.'/start.conf';
if (open F, ">$startconf") {
    print F "# This cluster was upgraded to a newer major version. The old
# cluster has been preserved for backup purposes, but is not started
# automatically.

manual
";
    close F;
} else {
    error "could not create $startconf: $!";
}

my $oldport = next_free_port;
print "Configuring old cluster to use a different port ($oldport)...\n";
set_cluster_port $version, $cluster, $oldport;

print "Starting target cluster on the original port...\n";
@argv = ('pg_ctlcluster', $newversion, $newcluster, 'start');
error "Could not start target cluster; please check configuration and log files" if system @argv;

# Run upgrade scripts in finish phase
if ($upgrade_scripts) {
    print "Running <finish> phase upgrade hook scripts...\n";
    if (!fork) {
	change_ugid $info{'owneruid'}, $info{'ownergid'};

        if ($PgCommon::rpm) {
            run_parts ("$PgCommon::common_confdir/pg_upgradecluster.d",
                $version, $newcluster, $newversion, 'finish');
            exit;
        }

	@argv = ('run-parts', '--lsbsysinit', '-a', $version, '-a', $newcluster,
	    '-a', $newversion, '-a', 'finish',
	    "$PgCommon::common_confdir/pg_upgradecluster.d");
	error "$PgCommon::common_confdir/pg_upgradecluster.d script failed" if system @argv;
        exit 0;
    }
    wait;
    exit $? >> 8 if ($?);
}

print "Success. Please check that the upgraded cluster works. If it does,
you can remove the old cluster with

  pg_dropcluster $version $cluster
"

__END__

=head1 NAME

pg_upgradecluster - upgrade an existing PostgreSQL cluster to a new major version.

=head1 SYNOPSIS

B<pg_upgradecluster> [B<-v> I<newversion>] I<oldversion> I<name> [I<newdatadir>]

=head1 DESCRIPTION

B<pg_upgradecluster> upgrades an existing PostgreSQL server cluster (i. e. a
collection of databases served by a B<postgres> instance) to a new version
specified by I<newversion> (default: latest available version).  The
configuration files of the old version are copied to the new cluster and
adjusted for the new version.  The new cluster is set up to use data page
checksums if the old cluster uses them.

The cluster of the old version will be configured to use a previously unused
port since the upgraded one will use the original port. The old cluster is not
automatically removed. After upgrading, please verify that the new cluster
indeed works as expected; if so, you should remove the old cluster with
L<pg_dropcluster(8)>. Please note that the old cluster is set to "manual"
startup mode, in order to avoid inadvertently changing it; this means that it
will not be started automatically on system boot, and you have to use
L<pg_ctlcluster(8)> to start/stop it. See section "STARTUP CONTROL" in
L<pg_createcluster(8)> for details.

The I<newdatadir> argument can be used to specify a non-default data directory
of the upgraded cluster. It is passed to B<pg_createcluster>. If not specified,
this defaults to /var/lib/postgresql/I<newversion>/I<name>.

=head1 OPTIONS

=over 4

=item B<-v> I<newversion>

Set the version to upgrade to (default: latest available).

=item B<--logfile> I<filel>

Set a custom log file path for the upgraded database cluster.

=item B<--locale=>I<locale>

Set the default locale for the upgraded database cluster. If this option is not
specified, the locale is inherited from the old cluster.

=item B<--lc-collate=>I<locale>

=item B<--lc-ctype=>I<locale>

=item B<--lc-messages=>I<locale>

=item B<--lc-monetary=>I<locale>

=item B<--lc-numeric=>I<locale>

=item B<--lc-time=>I<locale>

Like B<--locale>, but only sets the locale in the specified category.

=item B<-m>, B<--method=>dump|upgrade

Specify the upgrade method.  "dump" uses L<pg_dump(1)> and
L<pg_restore(1)>, "upgrade" uses L<pg_upgrade(1)>.  The default is
"dump".

=item B<-k>, B<--link>

In pg_upgrade mode, use hard links instead of copying files to the new
cluster.  This option is merely passed on to pg_upgrade.  See
L<pg_upgrade(1)> for details.

=item B<--rename> I<new cluster name>

Use a different name for the upgraded cluster.

=item B<--old-bindir> I<directory>

Passed to B<pg_upgrade>.

=back

=head1 HOOK SCRIPTS

Some PostgreSQL extensions like PostGIS need metadata in auxiliary tables which
must not be upgraded from the old version, but rather initialized for the new
version before copying the table data. For this purpose, extensions (as well as
administrators, of course) can drop upgrade hook scripts into 
C</etc/postgresql-common/pg_upgradecluster.d/>. Script file names must consist
entirely of upper and lower case letters, digits, underscores, and hyphens; in
particular, dots (i. e. file extensions) are not allowed.

Scripts in that directory will be called with the following arguments:

<old version> <cluster name> <new version> <phase>

Phases:

=over

=item B<init>

A virgin cluster of version I<new version> has been created, i. e.  this new
cluster will already have B<template1>, but no user databases. Please note that
you should not create tables in this phase, since they will be overwritten by
the dump/restore or B<pg_upgrade> operation.

=item B<finish>

All data from the old version cluster has been dumped/reloaded into the new
one. The old cluster still exists, but is not running.

=back

Failing scripts will abort the upgrade.
The scripts are called as the user who owns the database.

When B<--mode=dump> and upgrade hook scripts are used, pg_restore is invoked
with B<--no-data-for-failed-tables>.

=head1 SEE ALSO

L<pg_createcluster(8)>, L<pg_dropcluster(8)>, L<pg_lsclusters(1)>, L<pg_wrapper(1)>

=head1 AUTHOR

Martin Pitt L<E<lt>mpitt@debian.orgE<gt>>