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test_terminal: redirect child process' stdin to a pty

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When resuming, git-am detects if we are trying to feed it patches or not
by checking if stdin is a TTY.

However, the test library redirects stdin to /dev/null. This makes it
difficult, for instance, to test the behavior of "git am -3" when
resuming, as git-am will think we are trying to feed it patches and
error out.

Support this use case by extending test-terminal.perl to create a
pseudo-tty for the child process' standard input as well.

Note that due to the way the code is structured, the child's stdin
pseudo-tty will be closed when we finish reading from our stdin. This
means that in the common case, where our stdin is attached to /dev/null,
the child's stdin pseudo-tty will be closed immediately. Some operations
like isatty(), which git-am uses, require the file descriptor to be
open, and hence if the success of the command depends on such functions,
test_terminal's stdin should be redirected to a source with large amount
of data to ensure that the child's stdin is not closed, e.g.

	test_terminal git am --3way </dev/zero

Cc: Jonathan Nieder <jrnieder@gmail.com>
Cc: Jeff King <peff@peff.net>
Signed-off-by: Paul Tan <pyokagan@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Paul Tan 2015-08-04 22:08:49 +08:00 committed by Junio C Hamano
parent e97a5e765d
commit 18d8c26930
1 changed files with 28 additions and 4 deletions
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32
t/test-terminal.perl
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@ -5,15 +5,17 @@ use warnings;
use IO::Pty;
use File::Copy;
# Run @$argv in the background with stdio redirected to $out and $err.
# Run @$argv in the background with stdio redirected to $in, $out and $err.
sub start_child {
my ($argv, $out, $err) = @_;
my ($argv, $in, $out, $err) = @_;
my $pid = fork;
if (not defined $pid) {
die "fork failed: $!"
} elsif ($pid == 0) {
open STDIN, "<&", $in;
open STDOUT, ">&", $out;
open STDERR, ">&", $err;
close $in;
close $out;
exec(@$argv) or die "cannot exec '$argv->[0]': $!"
}
@ -49,6 +51,17 @@ sub xsendfile {
copy($in, $out, 4096) or $!{EIO} or die "cannot copy from child: $!";
}
sub copy_stdin {
my ($in) = @_;
my $pid = fork;
if (!$pid) {
xsendfile($in, \*STDIN);
exit 0;
}
close($in);
return $pid;
}
sub copy_stdio {
my ($out, $err) = @_;
my $pid = fork;
@ -67,14 +80,25 @@ sub copy_stdio {
if ($#ARGV < 1) {
die "usage: test-terminal program args";
}
my $master_in = new IO::Pty;
my $master_out = new IO::Pty;
my $master_err = new IO::Pty;
$master_in->set_raw();
$master_out->set_raw();
$master_err->set_raw();
$master_in->slave->set_raw();
$master_out->slave->set_raw();
$master_err->slave->set_raw();
my $pid = start_child(\@ARGV, $master_out->slave, $master_err->slave);
my $pid = start_child(\@ARGV, $master_in->slave, $master_out->slave, $master_err->slave);
close $master_in->slave;
close $master_out->slave;
close $master_err->slave;
my $in_pid = copy_stdin($master_in);
copy_stdio($master_out, $master_err);
exit(finish_child($pid));
my $ret = finish_child($pid);
# If the child process terminates before our copy_stdin() process is able to
# write all of its data to $master_in, the copy_stdin() process could stall.
# Send SIGTERM to it to ensure it terminates.
kill 'TERM', $in_pid;
finish_child($in_pid);
exit($ret);