lei: don't read --stdin terminals from daemon

We must use a foreground process to read from terminals
on stdin, otherwise weird things like lost keystrokes and
EIO can happen.  So take advantage of ->send_exec_cmd to
spawn `cat' in the same way we spawn MUAs, pagers,
`git config --edit' and `git credential' from script/lei

2 files changed, 10 insertions, 33 deletions

diff --git a/lib/PublicInbox/InputPipe.pm b/lib/PublicInbox/InputPipe.pm
index 232f20e8..ee5bda59 100644
--- a/lib/PublicInbox/InputPipe.pm
+++ b/lib/PublicInbox/InputPipe.pm
@@ -6,31 +6,6 @@ package PublicInbox::InputPipe;
 use v5.12;
 use parent qw(PublicInbox::DS);
 use PublicInbox::Syscall qw(EPOLLIN);
-use POSIX ();
-use Carp qw(croak carp);
-
-# I'm not sure what I'm doing w.r.t terminals.
-# FIXME needs non-interactive tests
-sub unblock_tty ($) {
-        my ($self) = @_;
-        my $fd = fileno($self->{sock});
-        my $t = POSIX::Termios->new;
-        $t->getattr($fd) or croak("tcgetattr($fd): $!");
-        return if $t->getlflag & POSIX::ICANON; # line-oriented, good
-
-        # make noncanonical mode TTYs behave like a O_NONBLOCK pipe.
-        # O_NONBLOCK itself isn't well-defined, here, so rely on VMIN + VTIME
-        my ($vmin, $vtime) = ($t->getcc(POSIX::VMIN), $t->getcc(POSIX::VTIME));
-        return if $vmin == 1 && $vtime == 0;
-
-        $t->setcc(POSIX::VMIN, 1); # 1 byte minimum
-        $t->setcc(POSIX::VTIME, 0); # no timeout
-        $t->setattr($fd, POSIX::TCSANOW) or croak("tcsetattr($fd): $!");
-
-        $t->setcc(POSIX::VMIN, $vmin);
-        $t->setcc(POSIX::VTIME, $vtime);
-        $self->{restore_termios} = $t;
-}
 
 sub consume {
         my ($in, $cb, @args) = @_;
@@ -41,18 +16,12 @@ sub consume {
                 $self->requeue;
         } elsif (-p _ || -S _) { # O_NONBLOCK for sockets and pipes
                 $in->blocking(0);
-        } elsif (-t $in) { # isatty(3) can't use `_' stat cache
-                unblock_tty($self);
         }
         $self;
 }
 
 sub close { # idempotent
         my ($self) = @_;
-        if (my $t = delete($self->{restore_termios})) {
-                my $fd = fileno($self->{sock} // return);
-                $t->setattr($fd, POSIX::TCSANOW) or carp("tcsetattr($fd): $!")
-        }
         $self->{-need_rq} ? delete($self->{sock}) : $self->SUPER::close
 }
 
@@ -67,7 +36,7 @@ sub event_step {
                         $self->{cb}->($self, @{$self->{args}}, '');
                         $self->close
                 } elsif ($!{EAGAIN}) { # rely on EPOLLIN
-                } elsif ($!{EINTR}) { # rely on EPOLLIN for sockets/pipes/tty
+                } elsif ($!{EINTR}) { # rely on EPOLLIN for sockets/pipes
                         $self->requeue if $self->{-need_rq};
                 } else { # another error
                         $self->{cb}->($self, @{$self->{args}}, undef);
diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm
index 681044c8..77acb5a1 100644
--- a/lib/PublicInbox/LEI.pm
+++ b/lib/PublicInbox/LEI.pm
@@ -1577,7 +1577,15 @@ sub _stdin_cb { # PublicInbox::InputPipe::consume callback for --stdin
 sub slurp_stdin {
         my ($lei, $cb) = @_;
         require PublicInbox::InputPipe;
-        PublicInbox::InputPipe::consume($lei->{0}, \&_stdin_cb, $lei, $cb);
+        my $in = $lei->{0};
+        if (-t $in) { # run cat via script/lei and read from it
+                $in = undef;
+                use autodie qw(pipe);
+                pipe($in, my $wr);
+                say { $lei->{2} } '# enter query, Ctrl-D when done';
+                send_exec_cmd($lei, [ $lei->{0}, $wr ], ['cat'], {});
+        }
+        PublicInbox::InputPipe::consume($in, \&_stdin_cb, $lei, $cb);
 }
 
 1;