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From: Eric Wong <e@yhbt.net>
To: meta@public-inbox.org
Subject: [PATCH 02/20] v2: index forwards (via `git log --reverse')
Date: Fri, 24 Jul 2020 05:55:48 +0000	[thread overview]
Message-ID: <20200724055606.27332-3-e@yhbt.net> (raw)
In-Reply-To: <20200724055606.27332-1-e@yhbt.net>

Since we'll need to expose THREADID to JMAP and IMAP users,
index all messages in the order they were committed to ensure
our `tid' (thread ID) column ascends in mirrors the same way
they do in the source inbox.

This drastically simplifies our code but increases memory
usage of `git-log'.  The next commit will bring memory use
back down at the expense of $TMPDIR usage.
---
 MANIFEST                         |   1 -
 lib/PublicInbox/MultiMidQueue.pm |  62 -------
 lib/PublicInbox/V2Writable.pm    | 279 +++++++++----------------------
 3 files changed, 81 insertions(+), 261 deletions(-)
 delete mode 100644 lib/PublicInbox/MultiMidQueue.pm

diff --git a/MANIFEST b/MANIFEST
index 963caad02..9d90c8c23 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -155,7 +155,6 @@ lib/PublicInbox/MboxGz.pm
 lib/PublicInbox/MsgIter.pm
 lib/PublicInbox/MsgTime.pm
 lib/PublicInbox/Msgmap.pm
-lib/PublicInbox/MultiMidQueue.pm
 lib/PublicInbox/NNTP.pm
 lib/PublicInbox/NNTPD.pm
 lib/PublicInbox/NNTPdeflate.pm
diff --git a/lib/PublicInbox/MultiMidQueue.pm b/lib/PublicInbox/MultiMidQueue.pm
deleted file mode 100644
index eb2ecf2f2..000000000
--- a/lib/PublicInbox/MultiMidQueue.pm
+++ /dev/null
@@ -1,62 +0,0 @@
-# Copyright (C) 2020 all contributors <meta@public-inbox.org>
-# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
-
-# temporary queue for public-inbox-index to support multi-Message-ID
-# messages on mirrors of v2 inboxes
-package PublicInbox::MultiMidQueue;
-use strict;
-use SDBM_File; # part of Perl standard library
-use Fcntl qw(O_RDWR O_CREAT);
-use File::Temp 0.19 (); # 0.19 for ->newdir
-my %e = (
-	freebsd => 0x100000,
-	linux => 0x80000,
-	netbsd => 0x400000,
-	openbsd => 0x10000,
-);
-my $O_CLOEXEC = $e{$^O} // 0;
-
-sub new {
-	my ($class) = @_;
-	my $tmpdir = File::Temp->newdir('multi-mid-q-XXXXXX', TMPDIR => 1);
-	my $base = $tmpdir->dirname . '/q';
-	my %sdbm;
-	my $flags = O_RDWR|O_CREAT;
-	if (!tie(%sdbm, 'SDBM_File', $base, $flags|$O_CLOEXEC, 0600)) {
-		if (!tie(%sdbm, 'SDBM_File', $base, $flags, 0600)) {
-			die "could not tie ($base): $!";
-		}
-		$O_CLOEXEC = 0;
-	}
-
-	bless {
-		cur => 1,
-		min => 1,
-		max => 0,
-		sdbm => \%sdbm,
-		tmpdir => $tmpdir,
-	}, $class;
-}
-
-sub set_oid {
-	my ($self, $i, $oid, $v2w) = @_;
-	$self->{max} = $i if $i > $self->{max};
-	$self->{min} = $i if $i < $self->{min};
-	$self->{sdbm}->{$i} = "$oid\t$v2w->{autime}\t$v2w->{cotime}";
-}
-
-sub get_oid {
-	my ($self, $i, $v2w) = @_;
-	my $rec = $self->{sdbm}->{$i} or return;
-	my ($oid, $autime, $cotime) = split(/\t/, $rec);
-	$v2w->{autime} = $autime;
-	$v2w->{cotime} = $cotime;
-	$oid
-}
-
-sub push_oid {
-	my ($self, $oid, $v2w) = @_;
-	set_oid($self, $self->{cur}++, $oid, $v2w);
-}
-
-1;
diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index 16556ddc2..c04ea5d77 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -18,10 +18,10 @@ use PublicInbox::OverIdx;
 use PublicInbox::Msgmap;
 use PublicInbox::Spawn qw(spawn popen_rd);
 use PublicInbox::SearchIdx;
-use PublicInbox::MultiMidQueue;
 use IO::Handle; # ->autoflush
 use File::Temp qw(tempfile);
 
+my $x40 = qr/[a-f0-9]{40}/;
 # an estimate of the post-packed size to the raw uncompressed size
 my $PACKING_FACTOR = 0.4;
 
@@ -862,18 +862,6 @@ sub atfork_child {
 	$self->{bnote}->[1];
 }
 
-sub mark_deleted ($$$$) {
-	my ($self, $sync, $git, $oid) = @_;
-	return if PublicInbox::SearchIdx::too_big($self, $git, $oid);
-	my $msgref = $git->cat_file($oid);
-	my $mime = PublicInbox::Eml->new($$msgref);
-	my $mids = mids($mime->header_obj);
-	my $chash = content_hash($mime);
-	foreach my $mid (@$mids) {
-		$sync->{D}->{"$mid\0$chash"} = $oid;
-	}
-}
-
 sub reindex_checkpoint ($$$) {
 	my ($self, $sync, $git) = @_;
 
@@ -891,107 +879,11 @@ sub reindex_checkpoint ($$$) {
 	$sync->{mm_tmp}->atfork_parent;
 }
 
-# only for a few odd messages with multiple Message-IDs
-sub reindex_oid_m ($$$$;$) {
-	my ($self, $sync, $git, $oid, $regen_num) = @_;
-	$self->{current_info} = "multi_mid $oid";
-	my ($num, $mid0, $len);
-	my $msgref = $git->cat_file($oid, \$len);
-	my $mime = PublicInbox::Eml->new($$msgref);
-	my $mids = mids($mime->header_obj);
-	my $chash = content_hash($mime);
-	die "BUG: reindex_oid_m called for <=1 mids" if scalar(@$mids) <= 1;
-
-	for my $mid (reverse @$mids) {
-		delete($sync->{D}->{"$mid\0$chash"}) and
-			die "BUG: reindex_oid should handle <$mid> delete";
-	}
-	my $over = $self->{over};
-	for my $mid (reverse @$mids) {
-		($num, $mid0) = $over->num_mid0_for_oid($oid, $mid);
-		next unless defined $num;
-		if (defined($regen_num) && $regen_num != $num) {
-			die "BUG: regen(#$regen_num) != over(#$num)";
-		}
-	}
-	unless (defined($num)) {
-		for my $mid (reverse @$mids) {
-			# is this a number we got before?
-			my $n = $sync->{mm_tmp}->num_for($mid);
-			next unless defined $n;
-			next if defined($regen_num) && $regen_num != $n;
-			($num, $mid0) = ($n, $mid);
-			last;
-		}
-	}
-	if (defined($num)) {
-		$sync->{mm_tmp}->num_delete($num);
-	} elsif (defined $regen_num) {
-		$num = $regen_num;
-		for my $mid (reverse @$mids) {
-			$self->{mm}->mid_set($num, $mid) == 1 or next;
-			$mid0 = $mid;
-			last;
-		}
-		unless (defined $mid0) {
-			warn "E: cannot regen #$num\n";
-			return;
-		}
-	} else { # fixup bugs in old mirrors on reindex
-		for my $mid (reverse @$mids) {
-			$num = $self->{mm}->mid_insert($mid);
-			next unless defined $num;
-			$mid0 = $mid;
-			last;
-		}
-		if (defined $mid0) {
-			if ($sync->{reindex}) {
-				warn "reindex added #$num <$mid0>\n";
-			}
-		} else {
-			warn "E: cannot find article #\n";
-			return;
-		}
-	}
-	$sync->{nr}++;
-	my $smsg = bless {
-		raw_bytes => $len,
-		num => $num,
-		blob => $oid,
-		mid => $mid0,
-	}, 'PublicInbox::Smsg';
-	$smsg->populate($mime, $self);
-	if (do_idx($self, $msgref, $mime, $smsg)) {
-		reindex_checkpoint($self, $sync, $git);
-	}
-}
-
-sub check_unindexed ($$$) {
-	my ($self, $num, $mid0) = @_;
-	my $unindexed = $self->{unindexed} // {};
-	my $n = delete($unindexed->{$mid0});
-	defined $n or return;
-	if ($n != $num) {
-		die "BUG: unindexed $n != $num <$mid0>\n";
-	} else {
-		$self->{mm}->mid_set($num, $mid0);
-	}
-}
-
-sub multi_mid_q_push ($$$) {
-	my ($self, $sync, $oid) = @_;
-	my $multi_mid = $sync->{multi_mid} //= PublicInbox::MultiMidQueue->new;
-	if ($sync->{reindex}) { # no regen on reindex
-		$multi_mid->push_oid($oid, $self);
-	} else {
-		my $num = $sync->{regen}--;
-		die "BUG: ran out of article numbers" if $num <= 0;
-		$multi_mid->set_oid($num, $oid, $self);
-	}
-}
-
 sub reindex_oid ($$$$) {
 	my ($self, $sync, $git, $oid) = @_;
+	if (my $D = $sync->{D}) { # don't waste I/O on deletes
+		return if $D->{pack('H*', $oid)};
+	}
 	return if PublicInbox::SearchIdx::too_big($self, $git, $oid);
 	my ($num, $mid0, $len);
 	my $msgref = $git->cat_file($oid, \$len);
@@ -1003,48 +895,57 @@ sub reindex_oid ($$$$) {
 	if (scalar(@$mids) == 0) {
 		warn "E: $oid has no Message-ID, skipping\n";
 		return;
-	} elsif (scalar(@$mids) == 1) {
-		my $mid = $mids->[0];
-
-		# was the file previously marked as deleted?, skip if so
-		if (delete($sync->{D}->{"$mid\0$chash"})) {
-			if (!$sync->{reindex}) {
-				$num = $sync->{regen}--;
-				$self->{mm}->num_highwater($num);
-			}
-			return;
-		}
+	}
 
-		# is this a number we got before?
-		$num = $sync->{mm_tmp}->num_for($mid);
+	# {unindexed} is unlikely
+	if ((my $unindexed = $self->{unindexed}) && scalar(@$mids) == 1) {
+		$num = delete($unindexed->{$mids->[0]});
 		if (defined $num) {
-			$mid0 = $mid;
-			check_unindexed($self, $num, $mid0);
-		} else {
-			$num = $sync->{regen}--;
-			die "BUG: ran out of article numbers" if $num <= 0;
-			if ($self->{mm}->mid_set($num, $mid) != 1) {
-				warn "E: unable to assign $num => <$mid>\n";
-				return;
-			}
-			$mid0 = $mid;
+			$mid0 = $mids->[0];
+			$self->{mm}->mid_set($num, $mid0);
+			delete($self->{unindexed}) if !keys(%$unindexed);
+		}
+	}
+	if (!defined($num)) { # reuse if reindexing (or duplicates)
+		my $over = $self->{over};
+		for my $mid (@$mids) {
+			($num, $mid0) = $over->num_mid0_for_oid($oid, $mid);
+			last if defined $num;
 		}
-	} else { # multiple MIDs are a weird case:
-		my $del = 0;
-		for (@$mids) {
-			$del += delete($sync->{D}->{"$_\0$chash"}) // 0;
+	}
+	$mid0 //= do { # is this a number we got before?
+		$num = $sync->{mm_tmp}->num_for($mids->[0]);
+		defined($num) ? $mids->[0] : undef;
+	};
+	if (!defined($num)) {
+		for (my $i = $#$mids; $i >= 1; $i--) {
+			$num = $sync->{mm_tmp}->num_for($mids->[$i]);
+			if (defined($num)) {
+				$mid0 = $mids->[$i];
+				last;
+			}
 		}
-		if ($del) {
-			unindex_oid_remote($self, $oid, $_) for @$mids;
-			# do not delete from {mm_tmp}, since another
-			# single-MID message may use it.
-		} else { # handle them at the end:
-			multi_mid_q_push($self, $sync, $oid);
+	}
+	if (defined($num)) {
+		$sync->{mm_tmp}->num_delete($num);
+	} else { # never seen
+		$num = $self->{mm}->mid_insert($mids->[0]);
+		if (defined($num)) {
+			$mid0 = $mids->[0];
+		} else { # rare, try the rest of them, backwards
+			for (my $i = $#$mids; $i >= 1; $i--) {
+				$num = $self->{mm}->mid_insert($mids->[$i]);
+				if (defined($num)) {
+					$mid0 = $mids->[$i];
+					last;
+				}
+			}
 		}
+	}
+	if (!defined($num)) {
+		warn "E: $oid <", join('> <', @$mids), "> is a duplicate\n";
 		return;
 	}
-	$sync->{mm_tmp}->mid_delete($mid0) or
-		die "failed to delete <$mid0> for article #$num\n";
 	$sync->{nr}++;
 	my $smsg = bless {
 		raw_bytes => $len,
@@ -1134,6 +1035,22 @@ $range
 	$range;
 }
 
+# don't bump num_highwater on --reindex
+sub mark_deleted ($$$) {
+	my ($git, $sync, $range) = @_;
+	my $D = $sync->{D} //= {}; # pack("H*", $oid) => NR
+	my $fh = $git->popen(qw(log --raw --no-abbrev
+			--pretty=tformat:%H
+			--no-notes --no-color --no-renames
+			--diff-filter=AM), $range, '--', 'd');
+	while (<$fh>) {
+		if (/\A:\d{6} 100644 $x40 ($x40) [AM]\td$/o) {
+			$D->{pack('H*', $1)}++;
+		}
+	}
+	close $fh or die "git log failed: \$?=$?";
+}
+
 sub sync_prepare ($$$) {
 	my ($self, $sync, $epoch_max) = @_;
 	my $pr = $sync->{-opt}->{-progress};
@@ -1144,7 +1061,7 @@ sub sync_prepare ($$$) {
 	# without {reindex}
 	my $reindex_heads = last_commits($self, $epoch_max) if $sync->{reindex};
 
-	for (my $i = $epoch_max; $i >= 0; $i--) {
+	for my $i (0..$epoch_max) {
 		die 'BUG: already indexing!' if $self->{reindex_pipe};
 		my $git_dir = git_dir_n($self, $i);
 		-d $git_dir or next; # missing epochs are fine
@@ -1168,8 +1085,8 @@ sub sync_prepare ($$$) {
 		close $fh or die "git log failed: \$?=$?";
 		$pr->("$n\n") if $pr;
 		$regen_max += $n;
+		mark_deleted($git, $sync, $range) if $sync->{reindex};
 	}
-
 	return 0 if (!$regen_max && !keys(%{$self->{unindex_range}}));
 
 	# reindex should NOT see new commits anymore, if we do,
@@ -1203,10 +1120,8 @@ sub unindex_oid ($$$;$) {
 		my ($id, $prev);
 		while (my $smsg = $over->next_by_mid($mid, \$id, \$prev)) {
 			$gone{$smsg->{num}} = 1 if $oid eq $smsg->{blob};
-			1; # continue
 		}
-		my $n = scalar keys %gone;
-		next unless $n;
+		my $n = scalar(keys(%gone)) or next;
 		if ($n > 1) {
 			warn "BUG: multiple articles linked to $oid\n",
 				join(',',sort keys %gone), "\n";
@@ -1222,7 +1137,6 @@ sub unindex_oid ($$$;$) {
 	}
 }
 
-my $x40 = qr/[a-f0-9]{40}/;
 sub unindex ($$$$) {
 	my ($self, $sync, $git, $unindex_range) = @_;
 	my $unindexed = $self->{unindexed} ||= {}; # $mid0 => $num
@@ -1276,22 +1190,29 @@ sub index_epoch ($$$) {
 	if (my $pr = $sync->{-opt}->{-progress}) {
 		$pr->("$i.git indexing $range\n");
 	}
-
-	my @cmd = qw(log --raw -r --pretty=tformat:%H.%at.%ct
+	my @cmd = qw(log --reverse --raw -r --pretty=tformat:%H.%at.%ct
 			--no-notes --no-color --no-abbrev --no-renames);
 	my $fh = $self->{reindex_pipe} = $git->popen(@cmd, $range);
 	my $cmt;
+	my $D = $sync->{D};
 	while (<$fh>) {
 		chomp;
 		$self->{current_info} = "$i.git $_";
 		if (/\A($x40)\.([0-9]+)\.([0-9]+)$/o) {
-			$cmt //= $1;
+			$cmt = $1;
 			$self->{autime} = $2;
 			$self->{cotime} = $3;
 		} elsif (/\A:\d{6} 100644 $x40 ($x40) [AM]\tm$/o) {
 			reindex_oid($self, $sync, $git, $1);
 		} elsif (/\A:\d{6} 100644 $x40 ($x40) [AM]\td$/o) {
-			mark_deleted($self, $sync, $git, $1);
+			# allow re-add if there was user error
+			my $oid = $1;
+			if ($D) {
+				my $oid_bin = pack('H*', $oid);
+				my $nr = --$D->{$oid_bin};
+				delete($D->{$oid_bin}) if $nr <= 0;
+			}
+			unindex_oid($self, $git, $oid);
 		}
 	}
 	close $fh or die "git log failed: \$?=$?";
@@ -1310,15 +1231,12 @@ sub index_sync {
 	$self->idx_init($opt); # acquire lock
 	$self->{over}->rethread_prepare($opt);
 	my $sync = {
-		D => {}, # "$mid\0$chash" => $oid
 		unindex_range => {}, # EPOCH => oid_old..oid_new
 		reindex => $opt->{reindex},
 		-opt => $opt
 	};
 	$sync->{ranges} = sync_ranges($self, $sync, $epoch_max);
-	$sync->{regen} = sync_prepare($self, $sync, $epoch_max);
-
-	if ($sync->{regen}) {
+	if (sync_prepare($self, $sync, $epoch_max)) {
 		# tmp_clone seems to fail if inside a transaction, so
 		# we rollback here (because we opened {mm} for reading)
 		# Note: we do NOT rely on DBI transactions for atomicity;
@@ -1328,43 +1246,8 @@ sub index_sync {
 		$sync->{mm_tmp} = $self->{mm}->tmp_clone;
 	}
 
-	# work backwards through history
-	for (my $i = $epoch_max; $i >= 0; $i--) {
-		index_epoch($self, $sync, $i);
-	}
-
-	# unindex is required for leftovers if "deletes" affect messages
-	# in a previous fetch+index window:
-	my $git;
-	if (my @leftovers = values %{delete $sync->{D}}) {
-		$git = $self->{-inbox}->git;
-		for my $oid (@leftovers) {
-			$self->{current_info} = "leftover $oid";
-			unindex_oid($self, $git, $oid);
-		}
-	}
-	if (my $multi_mid = delete $sync->{multi_mid}) {
-		$git //= $self->{-inbox}->git;
-		my $min = $multi_mid->{min};
-		my $max = $multi_mid->{max};
-		if ($sync->{reindex}) {
-			# we may need to create new Message-IDs if mirrors
-			# were initially indexed with old versions
-			for (my $i = $max; $i >= $min; $i--) {
-				my $oid;
-				$oid = $multi_mid->get_oid($i, $self) or next;
-				next unless defined $oid;
-				reindex_oid_m($self, $sync, $git, $oid);
-			}
-		} else { # regen on initial index
-			for my $num ($min..$max) {
-				my $oid;
-				$oid = $multi_mid->get_oid($num, $self) or next;
-				reindex_oid_m($self, $sync, $git, $oid, $num);
-			}
-		}
-	}
-	$git->cleanup if $git;
+	# work forwards through history
+	index_epoch($self, $sync, $_) for (0..$epoch_max);
 	$self->done;
 
 	if (my $nr = $sync->{nr}) {

  parent reply	other threads:[~2020-07-24  5:56 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-24  5:55 [PATCH 00/20] indexing changes and new features Eric Wong
2020-07-24  5:55 ` [PATCH 01/20] index: support --rethread switch to fix old indices Eric Wong
2020-07-24  5:55 ` Eric Wong [this message]
2020-07-24  5:55 ` [PATCH 03/20] v2writable: introduce idx_stack Eric Wong
2020-07-24  5:55 ` [PATCH 04/20] v2writable: index_sync: reduce fill_alternates calls Eric Wong
2020-07-24  5:55 ` [PATCH 05/20] v2writable: move {autime} and {cotime} into $sync state Eric Wong
2020-07-24  5:55 ` [PATCH 06/20] v2writable: allow >= 40 byte git object IDs Eric Wong
2020-07-24  5:55 ` [PATCH 07/20] v2writable: drop "EPOCH.git indexing $RANGE" progress Eric Wong
2020-07-24  5:55 ` [PATCH 08/20] use consistent {ibx} field for writable code paths Eric Wong
2020-07-24  5:55 ` [PATCH 09/20] search: avoid copying {inboxdir} Eric Wong
2020-07-24  5:55 ` [PATCH 10/20] v2writable: use read-only PublicInbox::Git for cat_file Eric Wong
2020-07-24  5:55 ` [PATCH 11/20] v2writable: get rid of {reindex_pipe} field Eric Wong
2020-07-24  5:55 ` [PATCH 12/20] v2writable: clarify "epoch" comment Eric Wong
2020-07-24  5:55 ` [PATCH 13/20] xapcmd: set {from} properly for v1 inboxes Eric Wong
2020-07-24  5:56 ` [PATCH 14/20] searchidx: rename _xdb_{acquire,release} => idx_ Eric Wong
2020-07-24  5:56 ` [PATCH 15/20] searchidx: make v1 indexing closer to v2 Eric Wong
2020-07-24  5:56 ` [PATCH 16/20] index+xcpdb: support --no-sync flag Eric Wong
2020-07-24  5:56 ` [PATCH 17/20] v2writable: share log2stack code with v1 Eric Wong
2020-07-24  5:56 ` [PATCH 18/20] searchidx: support async git check Eric Wong
2020-07-24  5:56 ` [PATCH 19/20] searchidx: $batch_cb => v1_checkpoint Eric Wong
2020-07-24  5:56 ` [PATCH 20/20] v2writable: {unindexed} belongs in $sync state Eric Wong

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  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200724055606.27332-3-e@yhbt.net \
    --to=e@yhbt.net \
    --cc=meta@public-inbox.org \
    --subject='Re: [PATCH 02/20] v2: index forwards (via `git log --reverse'\'')' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

user/dev discussion of public-inbox itself

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://public-inbox.org/meta
	git clone --mirror http://czquwvybam4bgbro.onion/meta
	git clone --mirror http://hjrcffqmbrq6wope.onion/meta
	git clone --mirror http://ou63pmih66umazou.onion/meta

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 meta meta/ https://public-inbox.org/meta \
		meta@public-inbox.org
	public-inbox-index meta

Example config snippet for mirrors.
Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.mail.public-inbox.meta
	nntp://7fh6tueqddpjyxjmgtdiueylzoqt6pt7hec3pukyptlmohoowvhde4yd.onion/inbox.comp.mail.public-inbox.meta
	nntp://ie5yzdi7fg72h7s4sdcztq5evakq23rdt33mfyfcddc5u3ndnw24ogqd.onion/inbox.comp.mail.public-inbox.meta
	nntp://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/inbox.comp.mail.public-inbox.meta
	nntp://news.gmane.io/gmane.mail.public-inbox.general
 note: .onion URLs require Tor: https://www.torproject.org/

code repositories for project(s) associated with this inbox:

	https://80x24.org/public-inbox.git

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git