+
+ # try a USR2 upgrade with workers:
+ my $httpd = abs_path('blib/script/public-inbox-httpd');
+ $psgi = abs_path($psgi);
+ my $opt = { run_mode => 0 };
+
+ my @args = ("-l$unix", '-D', '-P', $pid_file, -1, $out, -2, $err);
+ $td = start_script([$httpd, @args, $psgi], undef, $opt);
+ $td->join;
+ is($?, 0, "daemonized process again");
+ check_sock($unix);
+ ok(-s $pid_file, 'pid file written');
+ my $pid = $read_pid->($pid_file);
+
+ # stop worker to ensure check_sock below hits $new_pid
+ kill('TTOU', $pid) or die "TTOU failed: $!";
+
+ kill('USR2', $pid) or die "USR2 failed: $!";
+ delay_until(sub {
+ $pid != (eval { $read_pid->($pid_file) } // $pid)
+ });
+ my $new_pid = $read_pid->($pid_file);
+ isnt($new_pid, $pid, 'new child started');
+ ok($new_pid > 0, '$new_pid valid');
+ delay_until(sub { -s "$pid_file.oldbin" });
+ my $old_pid = $read_pid->("$pid_file.oldbin");
+ is($old_pid, $pid, '.oldbin pid file written');
+ ok($old_pid > 0, '$old_pid valid');
+
+ check_sock($unix); # ensures $new_pid is ready to receive signals
+
+ # first, back out of the upgrade
+ kill('QUIT', $new_pid) or die "kill new PID failed: $!";
+ delay_until(sub {
+ $pid == (eval { $read_pid->($pid_file) } // 0)
+ });
+ is($read_pid->($pid_file), $pid, 'old PID file restored');
+ ok(!-f "$pid_file.oldbin", '.oldbin PID file gone');
+
+ # retry USR2 upgrade
+ kill('USR2', $pid) or die "USR2 failed: $!";
+ delay_until(sub {
+ $pid != (eval { $read_pid->($pid_file) } // $pid)
+ });
+ $new_pid = $read_pid->($pid_file);
+ isnt($new_pid, $pid, 'new child started again');
+ $old_pid = $read_pid->("$pid_file.oldbin");
+ is($old_pid, $pid, '.oldbin pid file written');
+
+ # drop the old parent
+ kill('QUIT', $old_pid) or die "QUIT failed: $!";
+ delay_until(sub { !kill(0, $old_pid) });
+ ok(!-f "$pid_file.oldbin", '.oldbin PID file gone');
+
+ # drop the new child
+ check_sock($unix);
+ kill('QUIT', $new_pid) or die "QUIT failed: $!";
+ delay_until(sub { !kill(0, $new_pid) });
+ ok(!-f $pid_file, 'PID file is gone');
+
+
+ # try USR2 without workers (-W0)
+ $td = start_script([$httpd, @args, '-W0', $psgi], undef, $opt);
+ $td->join;
+ is($?, 0, 'daemonized w/o workers');
+ check_sock($unix);
+ $pid = $read_pid->($pid_file);
+
+ # replace running process
+ kill('USR2', $pid) or die "USR2 failed: $!";
+ delay_until(sub { !kill(0, $pid) });
+
+ check_sock($unix);
+ $pid = $read_pid->($pid_file);
+ kill('QUIT', $pid) or die "USR2 failed: $!";
+ delay_until(sub { !kill(0, $pid) });
+ ok(!-f $pid_file, 'PID file is gone');