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| | # Copyright (C) all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
# Wrapper to "git fetch" remote public-inboxes
package PublicInbox::Fetch;
use strict;
use v5.10.1;
use parent qw(PublicInbox::IPC);
use URI ();
use PublicInbox::Spawn qw(popen_rd run_die);
use PublicInbox::Admin;
use PublicInbox::LEI;
use PublicInbox::LeiCurl;
use PublicInbox::LeiMirror;
use File::Temp ();
use PublicInbox::Config;
use IO::Compress::Gzip qw(gzip $GzipError);
sub new { bless {}, __PACKAGE__ }
sub fetch_args ($$) {
my ($lei, $opt) = @_;
my @cmd; # (git --git-dir=...) to be added by caller
$opt->{$_} = $lei->{$_} for (0..2);
# we support "-c $key=$val" for arbitrary git config options
# e.g.: git -c http.proxy=socks5h://127.0.0.1:9050
push(@cmd, '-c', $_) for @{$lei->{opt}->{c} // []};
push @cmd, 'fetch';
push @cmd, '-q' if $lei->{opt}->{quiet};
push @cmd, '-v' if $lei->{opt}->{verbose};
@cmd;
}
sub remote_url ($$) {
my ($lei, $dir) = @_; # TODO: support non-"origin"?
my $cmd = [ qw(git config remote.origin.url) ];
my $fh = popen_rd($cmd, undef, { -C => $dir, 2 => $lei->{2} });
my $url = <$fh>;
close $fh or return;
$url =~ s!/*\n!!s;
$url;
}
sub do_manifest ($$$) {
my ($lei, $dir, $ibx_uri) = @_;
my $muri = URI->new("$ibx_uri/manifest.js.gz");
my $ft = File::Temp->new(TEMPLATE => 'm-XXXX',
UNLINK => 1, DIR => $dir, SUFFIX => '.tmp');
my $fn = $ft->filename;
my $mf = "$dir/manifest.js.gz";
my $m0; # current manifest.js.gz contents
if (open my $fh, '<', $mf) {
$m0 = eval {
PublicInbox::LeiMirror::decode_manifest($fh, $mf, $mf)
};
$lei->err($@) if $@;
}
my ($bn) = ($fn =~ m!/([^/]+)\z!);
my $curl_cmd = $lei->{curl}->for_uri($lei, $muri, qw(-R -o), $bn);
my $opt = { -C => $dir };
$opt->{$_} = $lei->{$_} for (0..2);
my $cerr = PublicInbox::LeiMirror::run_reap($lei, $curl_cmd, $opt);
if ($cerr) {
return [ 404, $muri ] if ($cerr >> 8) == 22; # 404 Missing
$lei->child_error($cerr, "@$curl_cmd failed");
return;
}
my $m1 = eval {
PublicInbox::LeiMirror::decode_manifest($ft, $fn, $muri);
} or return [ 404, $muri ];
my $mdiff = { %$m1 };
# filter out unchanged entries. We check modified, too, since
# fingerprints are SHA-1, so there's a teeny chance they'll collide
while (my ($k, $v0) = each %{$m0 // {}}) {
my $cur = $m1->{$k} // next;
my $f0 = $v0->{fingerprint} // next;
my $f1 = $cur->{fingerprint} // next;
my $t0 = $v0->{modified} // next;
my $t1 = $cur->{modified} // next;
delete($mdiff->{$k}) if $f0 eq $f1 && $t0 == $t1;
}
unless (keys %$mdiff) {
$lei->child_error(127 << 8) if $lei->{opt}->{'exit-code'};
return;
}
my (undef, $v1_path, @v2_epochs) =
PublicInbox::LeiMirror::deduce_epochs($mdiff, $ibx_uri->path);
[ 200, $muri, $v1_path, \@v2_epochs, $ft, $mf, $m1 ];
}
sub get_fingerprint2 {
my ($git_dir) = @_;
require Digest::SHA;
my $rd = popen_rd([qw(git show-ref)], undef, { -C => $git_dir });
Digest::SHA::sha256(do { local $/; <$rd> });
}
sub do_fetch { # main entry point
my ($cls, $lei, $cd) = @_;
my $ibx_ver;
$lei->{curl} //= PublicInbox::LeiCurl->new($lei) or return;
my $dir = PublicInbox::Admin::resolve_inboxdir($cd, \$ibx_ver);
my ($ibx_uri, @git_dir, @epochs, $mg, @new_epoch, $skip);
if ($ibx_ver == 1) {
my $url = remote_url($lei, $dir) //
die "E: $dir missing remote.origin.url\n";
$ibx_uri = URI->new($url);
} else { # v2:
require PublicInbox::MultiGit;
$mg = PublicInbox::MultiGit->new($dir, 'all.git', 'git');
@epochs = $mg->git_epochs;
my ($git_url, $epoch);
for my $nr (@epochs) { # try newest epoch, first
my $edir = "$dir/git/$nr.git";
unless (-d $edir && -w _) { # must be writable dir
$skip->{$nr} = 1;
next;
}
next if defined $git_url;
if (defined(my $url = remote_url($lei, $edir))) {
$git_url = $url;
$epoch = $nr;
} else {
warn "W: $edir missing remote.origin.url\n";
my $pid = spawn([qw(git config -l)], undef,
{ 1 => $lei->{2}, 2 => $lei->{2} });
waitpid($pid, 0);
$lei->child_error($?) if $?;
}
}
@epochs = grep { !$skip->{$_} } @epochs if $skip;
$skip //= {}; # makes code below easier
$git_url or die "Unable to determine git URL\n";
my $inbox_url = $git_url;
$inbox_url =~ s!/git/$epoch(?:\.git)?/?\z!! or
$inbox_url =~ s!/$epoch(?:\.git)?/?\z!! or die <<EOM;
Unable to infer inbox URL from <$git_url>
EOM
$ibx_uri = URI->new($inbox_url);
}
PublicInbox::LeiMirror::write_makefile($dir, $ibx_ver);
$lei->qerr("# inbox URL: $ibx_uri/");
my $res = do_manifest($lei, $dir, $ibx_uri) or return;
my ($code, $muri, $v1_path, $v2_epochs, $ft, $mf, $m1) = @$res;
if ($code == 404) {
# any pre-manifest.js.gz instances running? Just fetch all
# existing ones and unconditionally try cloning the next
$v2_epochs = [ map { "$dir/git/$_.git" } @epochs ];
if (@epochs) {
my $n = $epochs[-1] + 1;
push @$v2_epochs, "$dir/git/$n.git" if !$skip->{$n};
}
} else {
$code == 200 or die "BUG unexpected code $code\n";
}
my $mculled;
if ($ibx_ver == 2) {
defined($v1_path) and warn <<EOM;
E: got v1 `$v1_path' when expecting v2 epoch(s) in <$muri>, WTF?
EOM
@git_dir = map { "$dir/git/$_.git" } sort { $a <=> $b } map {
my ($nr) = (m!/([0-9]+)\.git\z!g);
$skip->{$nr} ? () : $nr;
} @$v2_epochs;
if ($m1 && scalar keys %$skip) {
my $re = join('|', keys %$skip);
my @del = grep(m!/git/$re\.git\z!, keys %$m1);
delete @$m1{@del};
$mculled = 1;
}
} else {
$git_dir[0] = $dir;
}
# n.b. this expects all epochs are from the same host
my $torsocks = $lei->{curl}->torsocks($lei, $muri);
my $fp2 = $lei->{opt}->{'exit-code'} ? [] : undef;
my $xit = 127;
for my $d (@git_dir) {
my $cmd;
my $opt = {}; # for spawn
if (-d $d) {
$fp2->[0] = get_fingerprint2($d) if $fp2;
$cmd = [ @$torsocks, 'git', "--git-dir=$d",
fetch_args($lei, $opt) ];
} else {
my $e_uri = $ibx_uri->clone;
my ($epath) = ($d =~ m!(/git/[0-9]+\.git)\z!);
defined($epath) or
die "BUG: $d is not an epoch to clone\n";
$e_uri->path($ibx_uri->path.$epath);
$cmd = [ @$torsocks,
PublicInbox::LeiMirror::clone_cmd($lei, $opt),
$$e_uri, $d];
push @new_epoch, substr($epath, 5, -4) + 0;
$xit = 0;
}
my $cerr = PublicInbox::LeiMirror::run_reap($lei, $cmd, $opt);
# do not bail on clone failure if we didn't have a manifest
if ($cerr && ($code == 200 || -d $d)) {
$lei->child_error($cerr, "@$cmd failed");
return;
}
if ($fp2 && $xit) {
$fp2->[1] = get_fingerprint2($d);
$xit = 0 if $fp2->[0] ne $fp2->[1];
}
}
for my $i (@new_epoch) { $mg->epoch_cfg_set($i) }
if ($ft) {
my $fn = $ft->filename;
if ($mculled) {
my $json = PublicInbox::Config->json->encode($m1);
gzip(\$json => $fn) or die "gzip: $GzipError";
}
rename($fn, $mf) or die "E: rename($fn, $mf): $!\n";
$ft->unlink_on_destroy(0);
}
$lei->child_error($xit << 8) if $fp2 && $xit;
}
1;
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