tests: test terminal output to both stdout and stderr

Some outputs (like the pager) care whether stdout is a
terminal. Others (like progress meters) care about stderr.

This patch sets up both. Technically speaking, we could go
further and set up just one (because either the other goes
to a terminal, or because our tests are only interested in
one). This patch does both to keep the interface to
lib-terminal simple.

Signed-off-by: Jeff King <peff@peff.net>
Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/lib-terminal.sh b/t/lib-terminal.sh
index 6fc33db6c14ffaa25e8b086a563be5f7b3829949..3258b8f0d5c36e0450ac5421b39b1ff4b3c379d0 100644 (file)
--- a/t/lib-terminal.sh
+++ b/t/lib-terminal.sh
@@ -1,19 +1,19 @@
 #!/bin/sh
 
 test_expect_success 'set up terminal for tests' '
-       if test -t 1
+       if test -t 1 && test -t 2
        then
-               >stdout_is_tty
+               >have_tty
        elif
                test_have_prereq PERL &&
                "$PERL_PATH" "$TEST_DIRECTORY"/test-terminal.perl \
-                       sh -c "test -t 1"
+                       sh -c "test -t 1 && test -t 2"
        then
                >test_terminal_works
        fi
 '
 
-if test -e stdout_is_tty
+if test -e have_tty
 then
        test_terminal() { "$@"; }
        test_set_prereq TTY

diff --git a/t/test-terminal.perl b/t/test-terminal.perl
index 73ff80937195f3ee8d4bf647a6c06bef23bb8891..c2e9dacc2d45c72c60fcc155a38ac0993e7e4455 100755 (executable)
--- a/t/test-terminal.perl
+++ b/t/test-terminal.perl
@@ -4,14 +4,15 @@ use warnings;
 use IO::Pty;
 use File::Copy;
 
-# Run @$argv in the background with stdout redirected to $out.
+# Run @$argv in the background with stdio redirected to $out and $err.
 sub start_child {
-       my ($argv, $out) = @_;
+       my ($argv, $out, $err) = @_;
        my $pid = fork;
        if (not defined $pid) {
                die "fork failed: $!"
        } elsif ($pid == 0) {
                open STDOUT, ">&", $out;
+               open STDERR, ">&", $err;
                close $out;
                exec(@$argv) or die "cannot exec '$argv->[0]': $!"
        }
@@ -47,12 +48,28 @@ sub xsendfile {
        copy($in, $out, 4096) or $!{EIO} or die "cannot copy from child: $!";
 }
 
+sub copy_stdio {
+       my ($out, $err) = @_;
+       my $pid = fork;
+       defined $pid or die "fork failed: $!";
+       if (!$pid) {
+               close($out);
+               xsendfile(\*STDERR, $err);
+               exit 0;
+       }
+       close($err);
+       xsendfile(\*STDOUT, $out);
+       finish_child($pid) == 0
+               or exit 1;
+}
+
 if ($#ARGV < 1) {
        die "usage: test-terminal program args";
 }
-my $master = new IO::Pty;
-my $slave = $master->slave;
-my $pid = start_child(\@ARGV, $slave);
-close $slave;
-xsendfile(\*STDOUT, $master);
+my $master_out = new IO::Pty;
+my $master_err = new IO::Pty;
+my $pid = start_child(\@ARGV, $master_out->slave, $master_err->slave);
+close $master_out->slave;
+close $master_err->slave;
+copy_stdio($master_out, $master_err);
 exit(finish_child($pid));