--- /dev/null
+# Copyright (C) 2016-2019 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+#
+# Ensure buffering behavior in -httpd doesn't cause runaway memory use
+# or data corruption
+use strict;
+use warnings;
+use Test::More;
+use POSIX qw(setsid);
+require './t/common.perl';
+
+my $git_dir = $ENV{GIANT_GIT_DIR};
+plan 'skip_all' => 'GIANT_GIT_DIR not defined' unless $git_dir;
+foreach my $mod (qw(BSD::Resource
+ Plack::Util Plack::Builder
+ HTTP::Date HTTP::Status Net::HTTP)) {
+ eval "require $mod";
+ plan skip_all => "$mod missing for git-http-backend.t" if $@;
+}
+my $psgi = "./t/git-http-backend.psgi";
+my ($tmpdir, $for_destroy) = tmpdir();
+my $err = "$tmpdir/stderr.log";
+my $out = "$tmpdir/stdout.log";
+my $sock = tcp_server();
+my $host = $sock->sockhost;
+my $port = $sock->sockport;
+my $td;
+
+my $get_maxrss = sub {
+ my $http = Net::HTTP->new(Host => "$host:$port");
+ ok($http, 'Net::HTTP object created for maxrss');
+ $http->write_request(GET => '/');
+ my ($code, $mess, %h) = $http->read_response_headers;
+ is($code, 200, 'success reading maxrss');
+ my $n = $http->read_entity_body(my $buf, 256);
+ ok(defined $n, 'read response body');
+ like($buf, qr/\A\d+\n\z/, 'got memory response');
+ ok(int($buf) > 0, 'got non-zero memory response');
+ int($buf);
+};
+
+{
+ ok($sock, 'sock created');
+ my $cmd = [ '-httpd', '-W0', "--stdout=$out", "--stderr=$err", $psgi ];
+ $td = start_script($cmd, undef, { 3 => $sock });
+}
+my $mem_a = $get_maxrss->();
+
+SKIP: {
+ my $max = 0;
+ my $pack;
+ my $glob = "$git_dir/objects/pack/pack-*.pack";
+ foreach my $f (glob($glob)) {
+ my $n = -s $f;
+ if ($n > $max) {
+ $max = $n;
+ $pack = $f;
+ }
+ }
+ skip "no packs found in $git_dir" unless defined $pack;
+ if ($pack !~ m!(/objects/pack/pack-[a-f0-9]{40}.pack)\z!) {
+ skip "bad pack name: $pack";
+ }
+ my $url = $1;
+ my $http = Net::HTTP->new(Host => "$host:$port");
+ ok($http, 'Net::HTTP object created');
+ $http->write_request(GET => $url);
+ my ($code, $mess, %h) = $http->read_response_headers;
+ is(200, $code, 'got 200 success for pack');
+ is($max, $h{'Content-Length'}, 'got expected Content-Length for pack');
+
+ # no $http->read_entity_body, here, since we want to force buffering
+ foreach my $i (1..3) {
+ sleep 1;
+ my $diff = $get_maxrss->() - $mem_a;
+ note "${diff}K memory increase after $i seconds";
+ ok($diff < 1024, 'no bloating caused by slow dumb client');
+ }
+}
+
+{
+ my $c = fork;
+ if ($c == 0) {
+ setsid();
+ exec qw(git clone -q --mirror), "http://$host:$port/",
+ "$tmpdir/mirror.git";
+ die "Failed start git clone: $!\n";
+ }
+ select(undef, undef, undef, 0.1);
+ foreach my $i (1..10) {
+ is(1, kill('STOP', -$c), 'signaled clone STOP');
+ sleep 1;
+ ok(kill('CONT', -$c), 'continued clone');
+ my $diff = $get_maxrss->() - $mem_a;
+ note "${diff}K memory increase after $i seconds";
+ ok($diff < 2048, 'no bloating caused by slow smart client');
+ }
+ ok(kill('CONT', -$c), 'continued clone');
+ is($c, waitpid($c, 0), 'reaped wayward slow clone');
+ is($?, 0, 'clone did not error out');
+ note 'clone done, fsck-ing clone result...';
+ is(0, system("git", "--git-dir=$tmpdir/mirror.git",
+ qw(fsck --no-progress)),
+ 'fsck did not report corruption');
+
+ my $diff = $get_maxrss->() - $mem_a;
+ note "${diff}K memory increase after smart clone";
+ ok($diff < 2048, 'no bloating caused by slow smart client');
+}
+
+{
+ ok($td->kill, 'killed httpd');
+ $td->join;
+}
+
+done_testing();