sandbox: check if stdin/out is associated with a tty

Library/Homebrew/sandbox.rb

@@ -97,15 +97,17 @@ class Sandbox
     seatbelt.close
     @start = Time.now
 
-    $stdin.raw!
+    $stdin.raw! if $stdin.tty?
     stdin_thread = T.let(nil, T.nilable(Thread))
 
     begin
       command = [SANDBOX_EXEC, "-f", seatbelt.path, *args]
       # Start sandbox in a pseudoterminal to prevent access of the parent terminal.
       T.unsafe(PTY).spawn(*command) do |r, w, pid|
-        w.winsize = $stdout.winsize
-        trap(:WINCH) { w.winsize = $stdout.winsize }
+        if $stdout.tty?
+          w.winsize = $stdout.winsize
+          trap(:WINCH) { w.winsize = $stdout.winsize }
+        end
         stdin_thread = Thread.new { IO.copy_stream($stdin, w) }
         r.each_char { |c| print(c) }
         Process.wait(pid)
@@ -116,7 +118,7 @@ class Sandbox
       raise
     ensure
       stdin_thread&.kill
-      $stdin.cooked!
+      $stdin.cooked! if $stdin.tty?
 
       seatbelt.unlink
       sleep 0.1 # wait for a bit to let syslog catch up the latest events.