clone: support multi-inbox clone

This is to ensure we can do `public-inbox-clone https://yhbt.net/lore'
or `public-inbox-clone https://lore.kernel.org/' and clone all
inboxes (and whatever else git stores).

3 files changed, 152 insertions, 61 deletions

diff --git a/lib/PublicInbox/Fetch.pm b/lib/PublicInbox/Fetch.pm
index 364271e8..3b6aa389 100644
--- a/lib/PublicInbox/Fetch.pm
+++ b/lib/PublicInbox/Fetch.pm
@@ -44,6 +44,21 @@ sub remote_url ($$) {
         undef
 }
 
+# PSGI mount prefixes and manifest.js.gz prefixes don't always align...
+# TODO: remove, handle multi-inbox fetch
+sub deduce_epochs ($$) {
+        my ($m, $path) = @_;
+        my ($v1_ent, @v2_epochs);
+        my $path_pfx = '';
+        $path =~ s!/+\z!!;
+        do {
+                $v1_ent = $m->{$path};
+                @v2_epochs = grep(m!\A\Q$path\E/git/[0-9]+\.git\z!, keys %$m);
+        } while (!defined($v1_ent) && !@v2_epochs &&
+                $path =~ s!\A(/[^/]+)/!/! and $path_pfx .= $1);
+        ($path_pfx, $v1_ent ? $path : undef, @v2_epochs);
+}
+
 sub do_manifest ($$$) {
         my ($lei, $dir, $ibx_uri) = @_;
         my $muri = URI->new("$ibx_uri/manifest.js.gz");
@@ -88,7 +103,7 @@ sub do_manifest ($$$) {
                 return;
         }
         my (undef, $v1_path, @v2_epochs) =
-                PublicInbox::LeiMirror::deduce_epochs($mdiff, $ibx_uri->path);
+                deduce_epochs($mdiff, $ibx_uri->path);
         [ 200, $muri, $v1_path, \@v2_epochs, $ft, $mf, $m1 ];
 }
 
diff --git a/lib/PublicInbox/LeiMirror.pm b/lib/PublicInbox/LeiMirror.pm
index ed8e4842..e356b5c5 100644
--- a/lib/PublicInbox/LeiMirror.pm
+++ b/lib/PublicInbox/LeiMirror.pm
@@ -1,4 +1,4 @@
-# Copyright (C) 2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 
 # "lei add-external --mirror" support (also "public-inbox-clone");
@@ -58,7 +58,7 @@ sub try_scrape {
         if (my @v2_urls = grep(m!\A\Q$url\E/[0-9]+\z!, @urls)) {
                 my %v2_epochs = map {
                         my ($n) = (m!/([0-9]+)\z!);
-                        $n => URI->new($_)
+                        $n => [ URI->new($_), '' ]
                 } @v2_urls; # uniq
                 return clone_v2($self, \%v2_epochs);
         }
@@ -104,26 +104,27 @@ sub ft_rename ($$$) {
 
 sub _get_txt { # non-fatal
         my ($self, $endpoint, $file, $mode) = @_;
-        my $uri = URI->new($self->{src});
+        my $uri = URI->new($self->{cur_src} // $self->{src});
         my $lei = $self->{lei};
         my $path = $uri->path;
         chop($path) eq '/' or die "BUG: $uri not canonicalized";
         $uri->path("$path/$endpoint");
-        my $ft = File::Temp->new(TEMPLATE => "$file-XXXX", DIR => $self->{dst});
+        my $dst = $self->{cur_dst} // $self->{dst};
+        my $ft = File::Temp->new(TEMPLATE => "$file-XXXX", DIR => $dst);
         my $opt = { 0 => $lei->{0}, 1 => $lei->{1}, 2 => $lei->{2} };
         my $cmd = $self->{curl}->for_uri($lei, $uri,
                                         qw(--compressed -R -o), $ft->filename);
         my $cerr = run_reap($lei, $cmd, $opt);
         return "$uri missing" if ($cerr >> 8) == 22;
         return "# @$cmd failed (non-fatal)" if $cerr;
-        ft_rename($ft, "$self->{dst}/$file", $mode);
+        ft_rename($ft, "$dst/$file", $mode);
         undef; # success
 }
 
 # tries the relatively new /$INBOX/_/text/config/raw endpoint
 sub _try_config {
         my ($self) = @_;
-        my $dst = $self->{dst};
+        my $dst = $self->{cur_dst} // $self->{dst};
         if (!-d $dst || !mkdir($dst)) {
                 require File::Path;
                 File::Path::mkpath($dst);
@@ -132,7 +133,7 @@ sub _try_config {
         my $err = _get_txt($self,
                         qw(_/text/config/raw inbox.config.example), 0444);
         return warn($err, "\n") if $err;
-        my $f = "$self->{dst}/inbox.config.example";
+        my $f = "$dst/inbox.config.example";
         my $cfg = PublicInbox::Config->git_config_dump($f, $self->{lei}->{2});
         my $ibx = $self->{ibx} = {};
         for my $sec (grep(/\Apublicinbox\./, @{$cfg->{-section_order}})) {
@@ -144,7 +145,8 @@ sub _try_config {
 
 sub set_description ($) {
         my ($self) = @_;
-        my $f = "$self->{dst}/description";
+        my $dst = $self->{cur_dst} // $self->{dst};
+        my $f = "$dst/description";
         open my $fh, '+>>', $f or die "open($f): $!";
         seek($fh, 0, SEEK_SET) or die "seek($f): $!";
         chomp(my $d = do { local $/; <$fh> } // die "read($f): $!");
@@ -152,7 +154,8 @@ sub set_description ($) {
                         $d =~ /^Unnamed repository/ || $d !~ /\S/) {
                 seek($fh, 0, SEEK_SET) or die "seek($f): $!";
                 truncate($fh, 0) or die "truncate($f): $!";
-                print $fh "mirror of $self->{src}\n" or die "print($f): $!";
+                my $src = $self->{cur_src} // $self->{src};
+                print $fh "mirror of $src\n" or die "print($f): $!";
                 close $fh or die "close($f): $!";
         }
 }
@@ -172,7 +175,7 @@ sub index_cloned_inbox {
                         address => [ 'lei@example.com' ],
                         version => $iv,
                 };
-                $ibx->{inboxdir} = $self->{dst};
+                $ibx->{inboxdir} = $self->{cur_dst} // $self->{dst};
                 PublicInbox::Inbox->new($ibx);
                 PublicInbox::InboxWritable->new($ibx);
                 my $opt = {};
@@ -188,6 +191,7 @@ sub index_cloned_inbox {
                 PublicInbox::Admin::progress_prepare($opt, $lei->{2});
                 PublicInbox::Admin::index_inbox($ibx, undef, $opt);
         }
+        return if defined $self->{cur_dst};
         open my $x, '>', "$self->{dst}/mirror.done"; # for _wq_done_wait
 }
 
@@ -205,21 +209,22 @@ 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 $uri = URI->new($self->{cur_src} // $self->{src});
         defined($lei->{opt}->{epoch}) and
                 die "$uri is a v1 inbox, --epoch is not supported\n";
         my $pfx = $curl->torsocks($lei, $uri) or return;
+        my $dst = $self->{cur_dst} // $self->{dst};
         my $cmd = [ @$pfx, clone_cmd($lei, my $opt = {}),
-                        $uri->as_string, $self->{dst} ];
+                        $uri->as_string, $dst ];
         my $cerr = run_reap($lei, $cmd, $opt);
         return $lei->child_error($cerr, "@$cmd failed") if $cerr;
         _try_config($self);
-        write_makefile($self->{dst}, 1);
+        write_makefile($dst, 1);
         index_cloned_inbox($self, 1);
 }
 
 sub parse_epochs ($$) {
-        my ($opt_epochs, $v2_epochs) = @_; # $epcohs "LOW..HIGH"
+        my ($opt_epochs, $v2_epochs) = @_; # $epochs "LOW..HIGH"
         $opt_epochs // return; # undef => all epochs
         my ($lo, $dotdot, $hi, @extra) = split(/(\.\.)/, $opt_epochs);
         undef($lo) if ($lo // '') eq '';
@@ -282,12 +287,13 @@ sub clone_v2 ($$;$) {
         my ($self, $v2_epochs, $m) = @_; # $m => manifest.js.gz hashref
         my $lei = $self->{lei};
         my $curl = $self->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
-        my $pfx = $curl->torsocks($lei, (values %$v2_epochs)[0]) or return;
-        my $dst = $self->{dst};
+        my $first_uri = (map { $_->[0] } values %$v2_epochs)[0];
+        my $pfx = $curl->torsocks($lei, $first_uri) or return;
+        my $dst = $self->{cur_dst} // $self->{dst};
         my $want = parse_epochs($lei->{opt}->{epoch}, $v2_epochs);
-        my (@src_edst, @read_only, @skip_nr);
+        my (@src_edst, @read_only, @skip);
         for my $nr (sort { $a <=> $b } keys %$v2_epochs) {
-                my $uri = $v2_epochs->{$nr};
+                my ($uri, $key) = @{$v2_epochs->{$nr}};
                 my $src = $uri->as_string;
                 my $edst = $dst;
                 $src =~ m!/([0-9]+)(?:\.git)?\z! or die <<"";
@@ -300,15 +306,11 @@ failed to extract epoch number from $src
                 } else { # create a placeholder so users only need to chmod +w
                         init_placeholder($src, $edst);
                         push @read_only, $edst;
-                        push @skip_nr, $nr;
+                        push @skip, $key;
                 }
         }
-        if (@skip_nr) { # filter out the epochs we skipped
-                my $re = join('|', @skip_nr);
-                my @del = grep(m!/git/$re\.git\z!, keys %$m);
-                delete @$m{@del};
-                $self->{-culled_manifest} = 1;
-        }
+        # filter out the epochs we skipped
+        $self->{-culled_manifest} = 1 if delete(@$m{@skip});
         my $lk = bless { lock_path => "$dst/inbox.lock" }, 'PublicInbox::Lock';
         _try_config($self);
         my $on_destroy = $lk->lock_for_scope($$);
@@ -326,25 +328,11 @@ failed to extract epoch number from $src
                 my @st = stat($edst) or die "stat($edst): $!";
                 chmod($st[2] & 0555, $edst) or die "chmod(a-w, $edst): $!";
         }
-        write_makefile($self->{dst}, 2);
+        write_makefile($dst, 2);
         undef $on_destroy; # unlock
         index_cloned_inbox($self, 2);
 }
 
-# PSGI mount prefixes and manifest.js.gz prefixes don't always align...
-sub deduce_epochs ($$) {
-        my ($m, $path) = @_;
-        my ($v1_ent, @v2_epochs);
-        my $path_pfx = '';
-        $path =~ s!/+\z!!;
-        do {
-                $v1_ent = $m->{$path};
-                @v2_epochs = grep(m!\A\Q$path\E/git/[0-9]+\.git\z!, keys %$m);
-        } while (!defined($v1_ent) && !@v2_epochs &&
-                $path =~ s!\A(/[^/]+)/!/! and $path_pfx .= $1);
-        ($path_pfx, $v1_ent ? $path : undef, @v2_epochs);
-}
-
 sub decode_manifest ($$$) {
         my ($fh, $fn, $uri) = @_;
         my $js;
@@ -357,6 +345,40 @@ sub decode_manifest ($$$) {
         $m;
 }
 
+sub multi_inbox ($$$) {
+        my ($self, $path, $m) = @_;
+
+        # assuming everything not v2 is v1, for now
+        my @v1 = sort grep(!m!.+/git/[0-9]+\.git\z!, keys %$m);
+        my @v2_epochs = sort grep(m!.+/git/[0-9]+\.git\z!, keys %$m);
+        my $v2 = {};
+
+        for (@v2_epochs) {
+                m!\A/(.+)/git/[0-9]+\.git\z! or die "BUG: $_";
+                push @{$v2->{$1}}, $_;
+        }
+        my $n = scalar(keys %$v2) + scalar(@v1);
+        my $ret; # { v1 => [ ... ], v2 => { $inbox_name => [ epochs ] }}
+        $ret->{v1} = \@v1 if @v1;
+        $ret->{v2} = $v2 if keys %$v2;
+        my $path_pfx = '';
+
+        # PSGI mount prefixes and manifest.js.gz prefixes don't always align...
+        if (@v2_epochs) {
+                until (grep(m!\A\Q$$path\E/git/[0-9]+\.git\z!,
+                                @v2_epochs) == @v2_epochs) {
+                        $$path =~ s!\A(/[^/]+)/!/! or last;
+                        $path_pfx .= $1;
+                }
+        } elsif (@v1) {
+                while (!defined($m->{$$path}) && $$path =~ s!\A(/[^/]+)/!/!) {
+                        $path_pfx .= $1;
+                }
+        }
+        ($path_pfx, $n, $ret);
+}
+
+# FIXME: this gets confused by single inbox instance w/ global manifest.js.gz
 sub try_manifest {
         my ($self) = @_;
         my $uri = URI->new($self->{src});
@@ -384,25 +406,48 @@ sub try_manifest {
                 warn $@;
                 return try_scrape($self);
         }
-        my ($path_pfx, $v1_path, @v2_epochs) = deduce_epochs($m, $path);
-        if (@v2_epochs) {
-                # It may be possible to have v1 + v2 in parallel someday:
-                warn(<<EOM) if defined $v1_path;
-# `$v1_path' appears to be a v1 inbox while v2 epochs exist:
-# @v2_epochs
-# ignoring $v1_path (use --inbox-version=1 to force v1 instead)
+        my ($path_pfx, $n, $multi) = multi_inbox($self, \$path, $m);
+        if (my $v2 = delete $multi->{v2}) {
+                for my $name (sort keys %$v2) {
+                        my $epochs = delete $v2->{$name};
+                        my %v2_epochs = map {
+                                $uri->path($n > 1 ? $path_pfx.$path.$_
+                                                : $path_pfx.$_);
+                                my ($e) = ("$uri" =~ m!/([0-9]+)\.git\z!);
+                                $e // die "no [0-9]+\.git in `$uri'";
+                                $e => [ $uri->clone, $_ ];
+                        } @$epochs;
+                        ("$uri" =~ m!\A(.+/)git/[0-9]+\.git\z!) or
+                                die "BUG: `$uri' !~ m!/git/[0-9]+.git!";
+                        local $self->{cur_src} = $1;
+                        local $self->{cur_dst} = $self->{dst};
+                        if ($n > 1 && $uri->path =~ m!\A\Q$path_pfx$path\E/(.+)/
+                                                        git/[0-9]+\.git\z!x) {
+                                $self->{cur_dst} .= "/$1";
+                        }
+                        index($self->{cur_dst}, "\n") >= 0 and die <<EOM;
+E: `$self->{cur_dst}' must not contain newline
 EOM
-                my %v2_epochs = map {
-                        $uri->path($path_pfx.$_);
-                        my ($n) = ("$uri" =~ m!/([0-9]+)\.git\z!);
-                        $n => $uri->clone
-                } @v2_epochs;
-                clone_v2($self, \%v2_epochs, $m);
-        } elsif (defined $v1_path) {
-                clone_v1($self);
-        } else {
-                die "E: confused by <$uri>, possible matches:\n\t",
-                        join("\n\t", sort keys %$m), "\n";
+                        clone_v2($self, \%v2_epochs, $m);
+                }
+        }
+        if (my $v1 = delete $multi->{v1}) {
+                my $p = $path_pfx.$path;
+                chop($p) if substr($p, -1, 1) eq '/';
+                $uri->path($p);
+                for my $name (@$v1) {
+                        local $self->{cur_src} = "$uri";
+                        local $self->{cur_dst} = $self->{dst};
+                        if ($n > 1) {
+                                $self->{cur_dst} .= $name;
+                                $self->{cur_src} .= $name;
+                        }
+                        index($self->{cur_dst}, "\n") >= 0 and die <<EOM;
+E: `$self->{cur_dst}' must not contain newline
+EOM
+                        $self->{cur_src} .= '/';
+                        clone_v1($self, 1);
+                }
         }
         if (delete $self->{-culled_manifest}) { # set by clone_v2
                 # write the smaller manifest if epochs were skipped so
@@ -414,6 +459,7 @@ EOM
                 utime($mtime, $mtime, $fn) or die "utime(..., $fn): $!";
         }
         ft_rename($ft, "$self->{dst}/manifest.js.gz", 0666);
+        open my $x, '>', "$self->{dst}/mirror.done"; # for _wq_done_wait
 }
 
 sub start_clone_url {
diff --git a/t/www_listing.t b/t/www_listing.t
index c556a2d7..e88bfbc5 100644
--- a/t/www_listing.t
+++ b/t/www_listing.t
@@ -1,5 +1,5 @@
 #!perl -w
-# Copyright (C) 2019-2021 all contributors <meta@public-inbox.org>
+# Copyright (C) all contributors <meta@public-inbox.org>
 # License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
 # manifest.js.gz generation and grok-pull integration test
 use strict; use v5.10.1; use PublicInbox::TestCommon;
@@ -115,10 +115,38 @@ SKIP: {
 
         my $env = { PI_CONFIG => $cfgfile };
         my $cmd = [ '-httpd', '-W0', "--stdout=$out", "--stderr=$err" ];
+        my $psgi = "$tmpdir/pfx.psgi";
+        {
+                open my $psgi_fh, '>', $psgi or xbail "open: $!";
+                print $psgi_fh <<'EOM' or xbail "print $!";
+use PublicInbox::WWW;
+use Plack::Builder;
+my $www = PublicInbox::WWW->new;
+builder {
+        enable 'Head';
+        mount '/pfx/' => sub { $www->call(@_) }
+}
+EOM
+                close $psgi_fh or xbail "close: $!";
+        }
+
+        # ensure prefixed mount full clones work:
+        $td = start_script([@$cmd, $psgi], $env, { 3 => $sock });
+        my $opt = { 2 => \(my $clone_err = '') };
+        ok(run_script(['-clone', "http://$host:$port/pfx", "$tmpdir/pfx" ],
+                undef, $opt), 'pfx clone w/pfx') or diag "clone_err=$clone_err";
+        undef $td;
+
         $td = start_script($cmd, $env, { 3 => $sock });
 
         # default publicinboxGrokManifest match=domain default
         tiny_test($json, $host, $port);
+
+        # normal full clone on /
+        $clone_err = '';
+        ok(run_script(['-clone', "http://$host:$port/", "$tmpdir/full" ],
+                undef, $opt), 'full clone') or diag "clone_err=$clone_err";
+
         undef $td;
 
         print $fh <<"" or xbail "print $!";
@@ -127,9 +155,11 @@ SKIP: {
 
         close $fh or xbail "close $!";
         $td = start_script($cmd, $env, { 3 => $sock });
-        tiny_test($json, $host, $port, 1);
         undef $sock;
+        tiny_test($json, $host, $port, 1);
 
+        # grok-pull sleeps a long while some places:
+        # https://lore.kernel.org/tools/20211013110344.GA10632@dcvr/
         skip 'TEST_GROK unset', 12 unless $ENV{TEST_GROK};
         my $grok_pull = require_cmd('grok-pull', 1) or
                 skip('grok-pull not available', 12);