+# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# "lei add-external --mirror" support
+package PublicInbox::LeiMirror;
+use strict;
+use v5.10.1;
+use parent qw(PublicInbox::IPC);
+use IO::Uncompress::Gunzip qw(gunzip $GunzipError);
+use PublicInbox::Spawn qw(popen_rd spawn);
+use PublicInbox::PktOp;
+
+sub mirror_done { # EOF callback for main daemon
+ my ($lei) = @_;
+ my $mrr = delete $lei->{mrr};
+ $mrr->wq_wait_old($lei) if $mrr;
+ # FIXME: check $? before finish
+ $lei->add_external_finish($mrr->{dst});
+ $lei->dclose;
+}
+
+# for old installations without manifest.js.gz
+sub try_scrape {
+ my ($self) = @_;
+ my $uri = URI->new($self->{src});
+ my $lei = $self->{lei};
+ my $curl = $self->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
+ my $cmd = $curl->for_uri($lei, $uri);
+ my $opt = { 0 => $lei->{0}, 2 => $lei->{2} };
+ my $fh = popen_rd($cmd, $lei->{env}, $opt);
+ my $html = do { local $/; <$fh> } // die "read(curl $uri): $!";
+ close($fh) or return $lei->child_error($?, "@$cmd failed");
+
+ # we grep with URL below, we don't want Subject/From headers
+ # making us clone random URLs
+ my @urls = ($html =~ m!\bgit clone --mirror ([a-z\+]+://\S+)!g);
+ my $url = $uri->as_string;
+ chop($url) eq '/' or die "BUG: $uri not canonicalized";
+
+ # since this is for old instances w/o manifest.js.gz, try v1 first
+ return clone_v1($self) if grep(m!\A\Q$url\E/*\z!, @urls);
+ if (my @v2_urls = grep(m!\A\Q$url\E/[0-9]+\z!, @urls)) {
+ my %v2_uris = map { $_ => URI->new($_) } @v2_urls; # uniq
+ return clone_v2($self, [ values %v2_uris ]);
+ }
+
+ # filter out common URLs served by WWW (e.g /$MSGID/T/)
+ if (@urls && $url =~ s!/+[^/]+\@[^/]+/.*\z!! &&
+ grep(m!\A\Q$url\E/*\z!, @urls)) {
+ die <<"";
+E: confused by scraping <$uri>, did you mean <$url>?
+
+ }
+ @urls and die <<"";
+E: confused by scraping <$uri>, got ambiguous results:
+@urls
+
+ die "E: scraping <$uri> revealed nothing\n";
+}
+
+sub clone_cmd {
+ my ($lei) = @_;
+ my @cmd = qw(git);
+ # we support "-c $key=$val" for arbitrary git config options
+ # e.g.: git -c http.proxy=socks5h://127.0.0.1:9050
+ push(@cmd, '-c', $_) for @{$lei->{opt}->{c} // []};
+ push @cmd, qw(clone --mirror);
+ push @cmd, '-q' if $lei->{opt}->{quiet};
+ push @cmd, '-v' if $lei->{opt}->{verbose};
+ # XXX any other options to support?
+ # --reference is tricky with multiple epochs...
+ @cmd;
+}
+
+# tries the relatively new /$INBOX/_/text/config/raw endpoint
+sub _try_config {
+ my ($self) = @_;
+ my $dst = $self->{dst};
+ if (!-d $dst || !mkdir($dst)) {
+ require File::Path;
+ File::Path::mkpath($dst);
+ -d $dst or die "mkpath($dst): $!\n";
+ }
+ my $uri = URI->new($self->{src});
+ my $lei = $self->{lei};
+ my $path = $uri->path;
+ chop($path) eq '/' or die "BUG: $uri not canonicalized";
+ $uri->path($path . '/_/text/config/raw');
+ my $cmd = $self->{curl}->for_uri($lei, $uri);
+ push @$cmd, '--compressed'; # curl decompresses for us
+ my $ce = "$dst/inbox.config.example";
+ my $f = "$ce-$$.tmp";
+ open(my $fh, '+>', $f) or return $lei->err("open $f: $! (non-fatal)");
+ my $opt = { 0 => $lei->{0}, 1 => $fh, 2 => $lei->{2} };
+ $lei->qerr("# @$cmd");
+ my $pid = spawn($cmd, $lei->{env}, $opt);
+ waitpid($pid, 0) == $pid or return $lei->err("waitpid @$cmd: $!");
+ if (($? >> 8) == 22) { # 404 missing
+ unlink($f) if -s $fh == 0;
+ return;
+ }
+ return $lei->err("# @$cmd failed (non-fatal)") if $?;
+ rename($f, $ce) or return $lei->err("link($f, $ce): $! (non-fatal)");
+ my $cfg = PublicInbox::Config::git_config_dump($f);
+ my $ibx = $self->{ibx} = {};
+ for my $sec (grep(/\Apublicinbox\./, @{$cfg->{-section_order}})) {
+ for (qw(address newsgroup nntpmirror)) {
+ $ibx->{$_} = $cfg->{"$sec.$_"};
+ }
+ }
+}
+
+sub index_cloned_inbox {
+ my ($self, $iv) = @_;
+ my $ibx = delete($self->{ibx}) // {
+ address => [ 'lei@example.com' ],
+ version => $iv,
+ };
+ $ibx->{inboxdir} = $self->{dst};
+ PublicInbox::Inbox->new($ibx);
+ PublicInbox::InboxWritable->new($ibx);
+ my $opt = {};
+ my $lei = $self->{lei};
+ for my $sw ($lei->index_opt) {
+ my ($k) = ($sw =~ /\A([\w-]+)/);
+ $opt->{$k} = $lei->{opt}->{$k};
+ }
+ # force synchronous dwaitpid for v2:
+ local $PublicInbox::DS::in_loop = 0;
+ my $cfg = PublicInbox::Config->new;
+ my $env = PublicInbox::Admin::index_prepare($opt, $cfg);
+ local %ENV = (%ENV, %$env) if $env;
+ PublicInbox::Admin::progress_prepare($opt, $lei->{2});
+ PublicInbox::Admin::index_inbox($ibx, undef, $opt);
+}
+
+sub clone_v1 {
+ my ($self) = @_;
+ my $lei = $self->{lei};
+ my $curl = $self->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
+ my $uri = URI->new($self->{src});
+ my $pfx = $curl->torsocks($lei, $uri) or return;
+ my $cmd = [ @$pfx, clone_cmd($lei), $uri->as_string, $self->{dst} ];
+ $lei->qerr("# @$cmd");
+ my $pid = spawn($cmd, $lei->{env}, $lei);
+ waitpid($pid, 0) == $pid or die "BUG: waitpid @$cmd: $!";
+ $? == 0 or return $lei->child_error($?, "@$cmd failed");
+ _try_config($self);
+ index_cloned_inbox($self, 1);
+}
+
+sub clone_v2 {
+ my ($self, $v2_uris) = @_;
+ my $lei = $self->{lei};
+ my $curl = $self->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
+ my $pfx //= $curl->torsocks($lei, $v2_uris->[0]) or return;
+ my @epochs;
+ my $dst = $self->{dst};
+ my @src_edst;
+ for my $uri (@$v2_uris) {
+ my $src = $uri->as_string;
+ my $edst = $dst;
+ $src =~ m!/([0-9]+)(?:\.git)?\z! or die <<"";
+failed to extract epoch number from $src
+
+ my $nr = $1 + 0;
+ $edst .= "/git/$nr.git";
+ push @src_edst, [ $src, $edst ];
+ }
+ my $lk = bless { lock_path => "$dst/inbox.lock" }, 'PublicInbox::Lock';
+ _try_config($self);
+ my $on_destroy = $lk->lock_for_scope($$);
+ my @cmd = clone_cmd($lei);
+ while (my $pair = shift(@src_edst)) {
+ my $cmd = [ @$pfx, @cmd, @$pair ];
+ $lei->qerr("# @$cmd");
+ my $pid = spawn($cmd, $lei->{env}, $lei);
+ waitpid($pid, 0) == $pid or die "BUG: waitpid @$cmd: $!";
+ $? == 0 or return $lei->child_error($?, "@$cmd failed");
+ }
+ undef $on_destroy; # unlock
+ index_cloned_inbox($self, 2);
+}
+
+sub try_manifest {
+ my ($self) = @_;
+ my $uri = URI->new($self->{src});
+ my $lei = $self->{lei};
+ my $curl = $self->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
+ my $path = $uri->path;
+ chop($path) eq '/' or die "BUG: $uri not canonicalized";
+ $uri->path($path . '/manifest.js.gz');
+ my $cmd = $curl->for_uri($lei, $uri);
+ $lei->qerr("# @$cmd");
+ my $opt = { 0 => $lei->{0}, 2 => $lei->{2} };
+ my $fh = popen_rd($cmd, $lei->{env}, $opt);
+ my $gz = do { local $/; <$fh> } // die "read(curl $uri): $!";
+ unless (close $fh) {
+ return try_scrape($self) if ($? >> 8) == 22; # 404 missing
+ return $lei->child_error($?, "@$cmd failed");
+ }
+ my $js;
+ gunzip(\$gz => \$js, MultiStream => 1) or
+ die "gunzip($uri): $GunzipError";
+ my $m = eval { PublicInbox::Config->json->decode($js) };
+ die "$uri: error decoding `$js': $@" if $@;
+ ref($m) eq 'HASH' or die "$uri unknown type: ".ref($m);
+
+ my $v1_bare = $m->{$path};
+ my @v2_epochs = grep(m!\A\Q$path\E/git/[0-9]+\.git\z!, keys %$m);
+ if (@v2_epochs) {
+ # It may be possible to have v1 + v2 in parallel someday:
+ $lei->err(<<EOM) if defined $v1_bare;
+# `$v1_bare' appears to be a v1 inbox while v2 epochs exist:
+# @v2_epochs
+# ignoring $v1_bare (use --inbox-version=1 to force v1 instead)
+EOM
+ @v2_epochs = map { $uri->path($_); $uri->clone } @v2_epochs;
+ clone_v2($self, \@v2_epochs);
+ } elsif ($v1_bare) {
+ clone_v1($self);
+ } elsif (my @maybe = grep(m!\Q$path\E!, keys %$m)) {
+ die "E: confused by <$uri>, possible matches:\n@maybe";
+ } else {
+ die "E: confused by <$uri>";
+ }
+}
+
+sub start_clone_url {
+ my ($self) = @_;
+ return try_manifest($self) if $self->{src} =~ m!\Ahttps?://!;
+ die "TODO: non-HTTP/HTTPS clone of $self->{src} not supported, yet";
+}
+
+sub do_mirror { # via wq_do
+ my ($self) = @_;
+ my $lei = $self->{lei};
+ eval {
+ my $iv = $lei->{opt}->{'inbox-version'};
+ if (defined $iv) {
+ return clone_v1($self) if $iv == 1;
+ return try_scrape($self) if $iv == 2;
+ die "bad --inbox-version=$iv\n";
+ }
+ return start_clone_url($self) if $self->{src} =~ m!://!;
+ die "TODO: cloning local directories not supported, yet";
+ };
+ return $lei->fail($@) if $@;
+ $lei->qerr("# mirrored $self->{src} => $self->{dst}");
+}
+
+sub start {
+ my ($cls, $lei, $src, $dst) = @_;
+ my $self = bless { lei => $lei, src => $src, dst => $dst }, $cls;
+ $lei->{mrr} = $self;
+ if ($src =~ m!https?://!) {
+ require URI;
+ require PublicInbox::LeiCurl;
+ }
+ require PublicInbox::Lock;
+ require PublicInbox::Inbox;
+ require PublicInbox::Admin;
+ require PublicInbox::InboxWritable;
+ my $ops = {
+ '!' => [ $lei->can('fail_handler'), $lei ],
+ 'x_it' => [ $lei->can('x_it'), $lei ],
+ 'child_error' => [ $lei->can('child_error'), $lei ],
+ '' => [ \&mirror_done, $lei ],
+ };
+ ($lei->{pkt_op_c}, $lei->{pkt_op_p}) = PublicInbox::PktOp->pair($ops);
+ $self->wq_workers_start('lei_mirror', 1, $lei->oldset, {lei => $lei});
+ my $op = delete $lei->{pkt_op_c};
+ delete $lei->{pkt_op_p};
+ $self->wq_do('do_mirror', []);
+ $self->wq_close(1);
+ $lei->event_step_init; # wait for shutdowns
+ if ($lei->{oneshot}) {
+ while ($op->{sock}) { $op->event_step }
+ }
+}
+
+sub ipc_atfork_child {
+ my ($self) = @_;
+ $self->{lei}->lei_atfork_child;
+ $self->SUPER::ipc_atfork_child;
+}
+
+1;