1 # Copyright (C) 2018 all contributors <meta@public-inbox.org>
2 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
4 # This interface wraps and mimics PublicInbox::Import
5 package PublicInbox::V2Writable;
8 use base qw(PublicInbox::Lock);
9 use PublicInbox::SearchIdxPart;
10 use PublicInbox::MIME;
12 use PublicInbox::Import;
13 use PublicInbox::MID qw(mids);
14 use PublicInbox::ContentId qw(content_id content_digest);
15 use PublicInbox::Inbox;
16 use PublicInbox::OverIdxFork;
17 use PublicInbox::Msgmap;
18 use PublicInbox::Spawn;
21 # an estimate of the post-packed size to the raw uncompressed size
22 my $PACKING_FACTOR = 0.4;
24 # assume 2 cores if GNU nproc(1) is not available
26 int($ENV{NPROC} || `nproc 2>/dev/null` || 2);
29 sub count_partitions ($) {
32 my $xpfx = $self->{xpfx};
34 # always load existing partitions in case core count changes:
35 # Also, partition count may change while -watch is running
38 foreach my $part (<$xpfx/*>) {
39 -d $part && $part =~ m!/\d+\z! or next;
41 Search::Xapian::Database->new($part)->close;
50 my ($class, $v2ibx, $creat) = @_;
51 my $dir = $v2ibx->{mainrepo} or die "no mainrepo in inbox\n";
55 File::Path::mkpath($dir);
57 die "$dir does not exist\n";
61 $v2ibx = PublicInbox::InboxWritable->new($v2ibx);
63 my $xpfx = "$dir/xap" . PublicInbox::Search::SCHEMA_VERSION;
66 im => undef, # PublicInbox::Import
70 over => PublicInbox::OverIdxFork->new("$xpfx/over.sqlite3"),
71 lock_path => "$dir/inbox.lock",
72 # limit each git repo (epoch) to 1GB or so
73 rotate_bytes => int((1024 * 1024 * 1024) / $PACKING_FACTOR),
74 last_commit => [], # git repo -> commit
76 $self->{partitions} = count_partitions($self) || nproc();
81 my ($self, $parallel) = @_;
82 $self->{parallel} = $parallel;
85 git_dir_latest($self, \$epoch_max);
86 $self->git_init($epoch_max >= 0 ? $epoch_max : 0);
90 # returns undef on duplicate or spam
91 # mimics Import::add and wraps it for v2
93 my ($self, $mime, $check_cb) = @_;
97 $mime = $check_cb->($mime) or return;
100 # All pipes (> $^F) known to Perl 5.6+ have FD_CLOEXEC set,
101 # as does SQLite 3.4.1+ (released in 2007-07-20), and
102 # Xapian 1.3.2+ (released 2015-03-15).
103 # For the most part, we can spawn git-fast-import without
104 # leaking FDs to it...
108 my $num = num_for($self, $mime, \$mid0);
109 defined $num or return; # duplicate
110 defined $mid0 or die "BUG: $mid0 undefined\n";
111 my $im = $self->importer;
112 my $cmt = $im->add($mime);
113 $cmt = $im->get_mark($cmt);
114 my ($oid, $len, $msgref) = @{$im->{last_object}};
116 my $nparts = $self->{partitions};
117 my $part = $num % $nparts;
118 $self->{last_commit}->[$self->{epoch_max}] = $cmt;
119 my $idx = $self->idx_part($part);
120 $idx->index_raw($len, $msgref, $num, $oid, $mid0, $mime);
121 my $n = $self->{transact_bytes} += $len;
122 if ($n > (PublicInbox::SearchIdx::BATCH_BYTES * $nparts)) {
130 my ($self, $mime, $mid0) = @_;
131 my $mids = mids($mime->header_obj);
133 my $mid = $mids->[0];
134 my $num = $self->{mm}->mid_insert($mid);
135 if (defined $num) { # common case
140 # crap, Message-ID is already known, hope somebody just resent:
142 foreach my $m (@$mids) {
143 # read-only lookup now safe to do after above barrier
144 my $existing = $self->lookup_content($mime, $m);
145 # easy, don't store duplicates
146 # note: do not add more diagnostic info here since
147 # it gets noisy on public-inbox-watch restarts
152 warn "<$mid> reused for mismatched content\n";
154 # try the rest of the mids
155 for(my $i = $#$mids; $i >= 1; $i--) {
157 $num = $self->{mm}->mid_insert($m);
159 warn "alternative <$m> for <$mid> found\n";
165 # none of the existing Message-IDs are good, generate a new one:
166 num_for_harder($self, $mime, $mid0);
170 my ($self, $mime, $mid0) = @_;
172 my $hdr = $mime->header_obj;
173 my $dig = content_digest($mime);
174 $$mid0 = PublicInbox::Import::digest2mid($dig);
175 my $num = $self->{mm}->mid_insert($$mid0);
176 unless (defined $num) {
177 # it's hard to spoof the last Received: header
178 my @recvd = $hdr->header_raw('Received');
179 $dig->add("Received: $_") foreach (@recvd);
180 $$mid0 = PublicInbox::Import::digest2mid($dig);
181 $num = $self->{mm}->mid_insert($$mid0);
183 # fall back to a random Message-ID and give up determinism:
184 until (defined($num)) {
186 $$mid0 = PublicInbox::Import::digest2mid($dig);
187 warn "using random Message-ID <$$mid0> as fallback\n";
188 $num = $self->{mm}->mid_insert($$mid0);
191 PublicInbox::Import::append_mid($hdr, $$mid0);
196 my ($self, $part) = @_;
197 $self->{idx_parts}->[$part];
203 return if $self->{idx_parts};
204 my $ibx = $self->{-inbox};
206 # do not leak read-only FDs to child processes, we only have these
207 # FDs for duplicate detection so they should not be
208 # frequently activated.
209 delete $ibx->{$_} foreach (qw(git mm search));
211 my $over = $self->{over};
213 $ibx->with_umask(sub {
215 $over->create($self);
217 # -compact can change partition count while -watch is idle
218 my $nparts = count_partitions($self);
219 if ($nparts && $nparts != $self->{partitions}) {
220 $self->{partitions} = $nparts;
223 # need to create all parts before initializing msgmap FD
224 my $max = $self->{partitions} - 1;
226 # idx_parts must be visible to all forked processes
227 my $idx = $self->{idx_parts} = [];
228 for my $i (0..$max) {
229 push @$idx, PublicInbox::SearchIdxPart->new($self, $i);
232 # Now that all subprocesses are up, we can open the FDs
234 my $mm = $self->{mm} = PublicInbox::Msgmap->new_file(
235 "$self->{-inbox}->{mainrepo}/msgmap.sqlite3", 1);
236 $mm->{dbh}->begin_work;
241 my ($self, $purge) = @_; # $purge = { $object_id => 1, ... }
243 my $pfx = "$self->{-inbox}->{mainrepo}/git";
245 foreach my $i (0..$self->{epoch_max}) {
246 my $git = PublicInbox::Git->new("$pfx/$i.git");
247 my $im = $self->import_init($git, 0, 1);
248 $purges->[$i] = $im->purge_oids($purge);
253 sub remove_internal {
254 my ($self, $mime, $cmt_msg, $purge) = @_;
257 my $im = $self->importer unless $purge;
258 my $ibx = $self->{-inbox};
259 my $srch = $ibx->search;
260 my $cid = content_id($mime);
261 my $parts = $self->{idx_parts};
262 my $mm = $self->{mm};
264 my $mids = mids($mime->header_obj);
266 # We avoid introducing new blobs into git since the raw content
267 # can be slightly different, so we do not need the user-supplied
268 # message now that we have the mids and content_id
272 foreach my $mid (@$mids) {
275 while (my $smsg = $srch->next_by_mid($mid, \$id, \$prev)) {
276 my $msg = $ibx->msg_by_smsg($smsg);
277 if (!defined($msg)) {
278 warn "broken smsg for $mid\n";
282 my $cur = PublicInbox::MIME->new($msg);
283 if (content_id($cur) eq $cid) {
284 $smsg->{mime} = $cur;
285 $gone{$smsg->{num}} = [ $smsg, \$orig ];
288 my $n = scalar keys %gone;
291 warn "BUG: multiple articles linked to <$mid>\n",
292 join(',', sort keys %gone), "\n";
294 foreach my $num (keys %gone) {
295 my ($smsg, $orig) = @{$gone{$num}};
296 $mm->num_delete($num);
297 # $removed should only be set once assuming
298 # no bugs in our deduplication code:
300 my $oid = $smsg->{blob};
304 ($mark, undef) = $im->remove($orig, $cmt_msg);
307 foreach my $idx (@$parts) {
308 $idx->remote_remove($oid, $mid);
315 my $cmt = $im->get_mark($mark);
316 $self->{last_commit}->[$self->{epoch_max}] = $cmt;
318 if ($purge && scalar keys %$purge) {
319 return purge_oids($self, $purge);
325 my ($self, $mime, $cmt_msg) = @_;
326 remove_internal($self, $mime, $cmt_msg);
330 my ($self, $mime) = @_;
331 my $purges = remove_internal($self, $mime, undef, {});
332 $self->idx_init if @$purges; # ->done is called on purges
333 for my $i (0..$#$purges) {
334 defined(my $cmt = $purges->[$i]) or next;
335 $self->{last_commit}->[$i] = $cmt;
340 sub last_commit_part ($$;$) {
341 my ($self, $i, $cmt) = @_;
342 my $v = PublicInbox::Search::SCHEMA_VERSION();
343 $self->{mm}->last_commit_xap($v, $i, $cmt);
346 sub set_last_commits ($) {
348 defined(my $epoch_max = $self->{epoch_max}) or return;
349 my $last_commit = $self->{last_commit};
350 foreach my $i (0..$epoch_max) {
351 defined(my $cmt = $last_commit->[$i]) or next;
352 $last_commit->[$i] = undef;
353 last_commit_part($self, $i, $cmt);
359 my $im = delete $self->{im};
360 $im->done if $im; # PublicInbox::Import::done
362 my $mm = $self->{mm};
363 $mm->{dbh}->commit if $mm;
365 # order matters, we can only close {over} after all partitions
366 # are done because the partitions also write to {over}
367 my $parts = delete $self->{idx_parts};
369 $_->remote_commit for @$parts;
370 $_->remote_close for @$parts;
373 my $over = $self->{over};
374 $over->remote_commit;
378 $mm->{dbh}->begin_work;
379 set_last_commits($self);
384 $self->{transact_bytes} = 0;
385 $self->lock_release if $parts;
390 my $im = $self->{im};
391 $im->checkpoint if $im; # PublicInbox::Import::checkpoint
395 # issue a write barrier to ensure all data is visible to other processes
396 # and read-only ops. Order of data importance is: git > SQLite > Xapian
400 if (my $im = $self->{im}) {
403 my $parts = $self->{idx_parts};
405 my $dbh = $self->{mm}->{dbh};
406 $dbh->commit; # SQLite msgmap data is second in importance
408 my $over = $self->{over};
410 # Now deal with Xapian and overview DB
411 $over->barrier_init(scalar(@$parts));
413 # each partition needs to issue a barrier command to over
414 $_->remote_barrier foreach @$parts;
416 $over->barrier_wait; # wait for each Xapian partition
418 # last_commit is special, don't commit these until
419 # remote partitions are done:
421 set_last_commits($self);
426 $self->{transact_bytes} = 0;
430 my ($self, $epoch) = @_;
431 my $pfx = "$self->{-inbox}->{mainrepo}/git";
432 my $git_dir = "$pfx/$epoch.git";
433 my @cmd = (qw(git init --bare -q), $git_dir);
434 PublicInbox::Import::run_die(\@cmd);
436 my $all = "$self->{-inbox}->{mainrepo}/all.git";
438 @cmd = (qw(git init --bare -q), $all);
439 PublicInbox::Import::run_die(\@cmd);
440 @cmd = (qw/git config/, "--file=$all/config",
441 'repack.writeBitmaps', 'true');
442 PublicInbox::Import::run_die(\@cmd);
445 @cmd = (qw/git config/, "--file=$git_dir/config",
446 'include.path', '../../all.git/config');
447 PublicInbox::Import::run_die(\@cmd);
449 my $alt = "$all/objects/info/alternates";
450 my $new_obj_dir = "../../git/$epoch.git/objects";
453 open(my $fh, '<', $alt) or die "open < $alt: $!\n";
454 %alts = map { chomp; $_ => 1 } (<$fh>);
456 return $git_dir if $alts{$new_obj_dir};
457 open my $fh, '>>', $alt or die "open >> $alt: $!\n";
458 print $fh "$new_obj_dir\n" or die "print >> $alt: $!\n";
459 close $fh or die "close $alt: $!\n";
464 my ($self, $max) = @_;
466 my $pfx = "$self->{-inbox}->{mainrepo}/git";
467 return unless -d $pfx;
469 opendir my $dh, $pfx or die "opendir $pfx: $!\n";
470 while (defined(my $git_dir = readdir($dh))) {
471 $git_dir =~ m!\A(\d+)\.git\z! or next;
474 $latest = "$pfx/$git_dir";
482 my $im = $self->{im};
484 if ($im->{bytes_added} < $self->{rotate_bytes}) {
491 my $git_dir = $self->git_init(++$self->{epoch_max});
492 my $git = PublicInbox::Git->new($git_dir);
493 return $self->import_init($git, 0);
498 my $latest = git_dir_latest($self, \$max);
499 if (defined $latest) {
500 my $git = PublicInbox::Git->new($latest);
501 my $packed_bytes = $git->packed_bytes;
502 if ($packed_bytes >= $self->{rotate_bytes}) {
505 $self->{epoch_max} = $max;
506 return $self->import_init($git, $packed_bytes);
509 $self->{epoch_max} = $epoch;
510 $latest = $self->git_init($epoch);
511 $self->import_init(PublicInbox::Git->new($latest), 0);
515 my ($self, $git, $packed_bytes, $tmp) = @_;
516 my $im = PublicInbox::Import->new($git, undef, undef, $self->{-inbox});
517 $im->{bytes_added} = int($packed_bytes / $PACKING_FACTOR);
518 $im->{want_object_info} = 1;
519 $im->{lock_path} = undef;
520 $im->{path_type} = 'v2';
521 $self->{im} = $im unless $tmp;
527 my ($mid, $cur, $new) = @_;
528 use File::Temp qw(tempfile);
529 use PublicInbox::Spawn qw(spawn);
531 my ($ah, $an) = tempfile('email-cur-XXXXXXXX', TMPDIR => 1);
532 print $ah $cur->as_string or die "print: $!";
533 close $ah or die "close: $!";
534 my ($bh, $bn) = tempfile('email-new-XXXXXXXX', TMPDIR => 1);
535 PublicInbox::Import::drop_unwanted_headers($new);
536 print $bh $new->as_string or die "print: $!";
537 close $bh or die "close: $!";
538 my $cmd = [ qw(diff -u), $an, $bn ];
539 print STDERR "# MID conflict <$mid>\n";
540 my $pid = spawn($cmd, undef, { 1 => 2 });
541 defined $pid or die "diff failed to spawn $!";
542 waitpid($pid, 0) == $pid or die "diff did not finish";
547 my ($self, $mime, $mid) = @_;
548 my $ibx = $self->{-inbox};
550 my $srch = $ibx->search->reopen;
551 my $cid = content_id($mime);
554 while (my $smsg = $srch->next_by_mid($mid, \$id, \$prev)) {
555 my $msg = $ibx->msg_by_smsg($smsg);
556 if (!defined($msg)) {
557 warn "broken smsg for $mid\n";
560 my $cur = PublicInbox::MIME->new($msg);
561 if (content_id($cur) eq $cid) {
562 $smsg->{mime} = $cur;
567 # XXX DEBUG_DIFF is experimental and may be removed
568 diff($mid, $cur, $mime) if $ENV{DEBUG_DIFF};
575 my $fh = delete $self->{reindex_pipe};
577 if (my $parts = $self->{idx_parts}) {
578 $_->atfork_child foreach @$parts;
580 if (my $im = $self->{im}) {
583 die "unexpected mm" if $self->{mm};
587 my ($self, $D, $git, $oid) = @_;
588 my $msgref = $git->cat_file($oid);
589 my $mime = PublicInbox::MIME->new($$msgref);
590 my $mids = mids($mime->header_obj);
591 my $cid = content_id($mime);
592 foreach my $mid (@$mids) {
593 $D->{"$mid\0$cid"} = 1;
598 my ($self, $mm_tmp, $D, $git, $oid, $regen) = @_;
600 my $msgref = $git->cat_file($oid, \$len);
601 my $mime = PublicInbox::MIME->new($$msgref);
602 my $mids = mids($mime->header_obj);
603 my $cid = content_id($mime);
605 # get the NNTP article number we used before, highest number wins
606 # and gets deleted from mm_tmp;
610 foreach my $mid (@$mids) {
611 $del += (delete $D->{"$mid\0$cid"} || 0);
612 my $n = $mm_tmp->num_for($mid);
613 if (defined $n && $n > $num) {
618 if (!defined($mid0) && $regen && !$del) {
620 die "BUG: ran out of article numbers\n" if $num <= 0;
621 my $mm = $self->{mm};
622 foreach my $mid (reverse @$mids) {
623 if ($mm->mid_set($num, $mid) == 1) {
628 if (!defined($mid0)) {
629 my $id = '<' . join('> <', @$mids) . '>';
630 warn "Message-ID $id unusable for $num\n";
631 foreach my $mid (@$mids) {
632 defined(my $n = $mm->num_for($mid)) or next;
633 warn "#$n previously mapped for <$mid>\n";
638 if (!defined($mid0) || $del) {
639 if (!defined($mid0) && $del) { # expected for deletes
644 my $id = '<' . join('> <', @$mids) . '>';
646 warn "Skipping $id, no article number found\n";
647 if ($del && defined($mid0)) {
648 warn "$id was deleted $del " .
649 "time(s) but mapped to article #$num\n";
654 $mm_tmp->mid_delete($mid0) or
655 die "failed to delete <$mid0> for article #$num\n";
657 my $nparts = $self->{partitions};
658 my $part = $num % $nparts;
659 my $idx = $self->idx_part($part);
660 $idx->index_raw($len, $msgref, $num, $oid, $mid0, $mime);
661 my $n = $self->{transact_bytes} += $len;
662 if ($n > (PublicInbox::SearchIdx::BATCH_BYTES * $nparts)) {
664 $mm_tmp->atfork_prepare;
665 $self->done; # release lock
666 # allow -watch or -mda to write...
667 $self->idx_init; # reacquire lock
668 $mm_tmp->atfork_parent;
672 # only update last_commit for $i on reindex iff newer than current
673 sub update_last_commit {
674 my ($self, $git, $i, $cmt) = @_;
675 my $last = last_commit_part($self, $i);
676 if (defined $last && is_ancestor($git, $last, $cmt)) {
677 my @cmd = (qw(rev-list --count), "$last..$cmt");
678 chomp(my $n = $git->qx(@cmd));
679 return if $n ne '' && $n == 0;
681 last_commit_part($self, $i, $cmt);
684 sub git_dir_n ($$) { "$_[0]->{-inbox}->{mainrepo}/git/$_[1].git" }
687 my ($self, $epoch_max) = @_;
689 for (my $i = $epoch_max; $i >= 0; $i--) {
690 $heads->[$i] = last_commit_part($self, $i);
695 sub is_ancestor ($$$) {
696 my ($git, $cur, $tip) = @_;
697 return 0 unless $git->check($cur);
698 my $cmd = [ 'git', "--git-dir=$git->{git_dir}",
699 qw(merge-base --is-ancestor), $cur, $tip ];
700 my $pid = spawn($cmd);
701 defined $pid or die "spawning ".join(' ', @$cmd)." failed: $!";
702 waitpid($pid, 0) == $pid or die join(' ', @$cmd) .' did not finish';
707 my ($self, $opts, $epoch_max, $ranges) = @_;
709 my $head = $self->{-inbox}->{ref_head} || 'refs/heads/master';
710 for (my $i = $epoch_max; $i >= 0; $i--) {
711 die "already indexing!\n" if $self->{index_pipe};
712 my $git_dir = git_dir_n($self, $i);
713 -d $git_dir or next; # missing parts are fine
714 my $git = PublicInbox::Git->new($git_dir);
715 chomp(my $tip = $git->qx('rev-parse', $head));
717 if (defined(my $cur = $ranges->[$i])) {
718 $range = "$cur..$tip";
719 if (is_ancestor($git, $cur, $tip)) { # common case
720 my $n = $git->qx(qw(rev-list --count), $range);
723 $ranges->[$i] = undef;
728 discontiguous range: $range
729 Rewritten history? (in $git_dir)
731 my $base = $git->qx('merge-base', $tip, $cur);
734 $range = "$base..$tip";
735 warn "found merge-base: $base\n"
739 discarding history at $cur
743 reindexing $git_dir starting at
746 $self->{"unindex-range.$i"} = "$base..$cur";
749 $range = $tip; # all of it
751 $ranges->[$i] = $range;
753 # can't use 'rev-list --count' if we use --diff-filter
754 my $fh = $git->popen(qw(log --pretty=tformat:%h
755 --no-notes --no-color --no-renames
756 --diff-filter=AM), $range, '--', 'm');
757 ++$regen_max while <$fh>;
763 my ($self, $git, $oid) = @_;
764 my $msgref = $git->cat_file($oid);
765 my $mime = PublicInbox::MIME->new($msgref);
766 my $mids = mids($mime->header_obj);
767 $mime = $msgref = undef;
768 my $srch = $self->{-inbox}->search;
769 foreach my $mid (@$mids) {
772 while (my $smsg = $srch->next_by_mid($mid, \$id, \$prev)) {
773 $gone{$smsg->num} = 1 if $oid eq $smsg->{blob};
776 my $n = scalar keys %gone;
779 warn "BUG: multiple articles linked to $oid\n",
780 join(',',sort keys %gone), "\n";
782 $self->{unindexed}->{$_}++ foreach keys %gone;
783 $_->remote_remove($oid, $mid) foreach @{$self->{idx_parts}};
784 $self->{over}->remove_oid($oid, $mid);
789 my $x40 = qr/[a-f0-9]{40}/;
791 my ($self, $opts, $git, $unindex_range) = @_;
792 my $un = $self->{unindexed} ||= {}; # num => removal count
794 my $before = scalar keys %$un;
795 my @cmd = qw(log --raw -r
796 --no-notes --no-color --no-abbrev --no-renames);
797 my $fh = $self->{reindex_pipe} = $git->popen(@cmd, $unindex_range);
799 /\A:\d{6} 100644 $x40 ($x40) [AM]\tm$/o or next;
800 $self->unindex_oid($git, $1);
802 delete $self->{reindex_pipe};
805 return unless $opts->{prune};
806 my $after = scalar keys %$un;
807 return if $before == $after;
809 # ensure any blob can not longer be accessed via dumb HTTP
810 PublicInbox::Import::run_die(['git', "--git-dir=$git->{git_dir}",
811 qw(-c gc.reflogExpire=now gc --prune=all)]);
815 my ($self, $opts) = @_;
817 my $ibx = $self->{-inbox};
819 my $latest = git_dir_latest($self, \$epoch_max);
820 return unless defined $latest;
821 $self->idx_init; # acquire lock
822 my $mm_tmp = $self->{mm}->tmp_clone;
823 my $ranges = $opts->{reindex} ? [] : $self->last_commits($epoch_max);
825 my ($min, $max) = $mm_tmp->minmax;
826 my $regen = $self->index_prepare($opts, $epoch_max, $ranges);
827 $$regen += $max if $max;
829 my @cmd = qw(log --raw -r --pretty=tformat:%h
830 --no-notes --no-color --no-abbrev --no-renames);
832 # work backwards through history
833 my $last_commit = [];
834 for (my $i = $epoch_max; $i >= 0; $i--) {
835 my $git_dir = git_dir_n($self, $i);
836 die "already reindexing!\n" if delete $self->{reindex_pipe};
837 -d $git_dir or next; # missing parts are fine
838 my $git = PublicInbox::Git->new($git_dir);
839 my $unindex = delete $self->{"unindex-range.$i"};
840 $self->unindex($opts, $git, $unindex) if $unindex;
841 defined(my $range = $ranges->[$i]) or next;
842 my $fh = $self->{reindex_pipe} = $git->popen(@cmd, $range);
845 if (/\A$x40$/o && !defined($cmt)) {
847 } elsif (/\A:\d{6} 100644 $x40 ($x40) [AM]\tm$/o) {
848 $self->reindex_oid($mm_tmp, $D, $git, $1,
850 } elsif (/\A:\d{6} 100644 $x40 ($x40) [AM]\td$/o) {
851 $self->mark_deleted($D, $git, $1);
855 delete $self->{reindex_pipe};
856 $self->update_last_commit($git, $i, $cmt) if defined $cmt;
858 my @d = sort keys %$D;
860 warn "BUG: ", scalar(@d)," unseen deleted messages marked\n";
862 my ($mid, undef) = split(/\0/, $_, 2);