t/run.perl: drop Cwd dependency

Perl 5.8.8/5.10.0+ can use fchdir(), and we depend on 5.10.1+

diff --git a/t/run.perl b/t/run.perl
index d0b29e687158792ee0fac02a0e22cb3fcfc7b18d..e8512e183acc84cceab436b223ca947f209e1ee2 100755 (executable)
--- a/t/run.perl
+++ b/t/run.perl
@@ -14,7 +14,6 @@ use strict;
 use v5.10.1;
 use IO::Handle; # ->autoflush
 use PublicInbox::TestCommon;
-use Cwd qw(getcwd);
 use Getopt::Long qw(:config gnu_getopt no_ignore_case auto_abbrev);
 use Errno qw(EINTR);
 use Fcntl qw(:seek);
@@ -33,7 +32,7 @@ if (($ENV{TEST_RUN_MODE} // 2) == 0) {
        die "$0 is not compatible with TEST_RUN_MODE=0\n";
 }
 my @tests = scalar(@ARGV) ? @ARGV : glob('t/*.t');
-my $cwd = getcwd();
+open my $cwd_fh, '<', '.' or die "open .: $!";
 open my $OLDOUT, '>&STDOUT' or die "dup STDOUT: $!";
 open my $OLDERR, '>&STDERR' or die "dup STDERR: $!";
 $OLDOUT->autoflush(1);
@@ -64,7 +63,7 @@ our ($worker, $worker_test);
 sub test_status () {
        $? = 255 if $? == 0 && !$tb->is_passing;
        my $status = $? ? 'not ok' : 'ok';
-       chdir($cwd) or DIE "chdir($cwd): $!";
+       chdir($cwd_fh) or DIE "fchdir: $!";
        if ($log_suffix ne '') {
                my $log = $worker_test;
                $log =~ s/\.t\z/$log_suffix/;