sandbox: fallback to tput for winsize

Homebrew · Sep 1, 2021 · 45cf5da · 45cf5da
1 parent 008296f
commit 45cf5da
Showing 1 changed file with 9 additions and 2 deletions.
diff --git a/Library/Homebrew/sandbox.rb b/Library/Homebrew/sandbox.rb
@@ -101,8 +101,15 @@ def exec(*args)
       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|
-        old_winch = trap(:WINCH) { w.winsize = $stdout.winsize if $stdout.tty? }
-        w.winsize = $stdout.winsize if $stdout.tty?
+        winch = proc do |_sig|
+          w.winsize = if $stdout.tty?
+            $stdout.winsize
+          else
+            [Utils.popen_read("tput", "lines").to_i, Utils.popen_read("tput", "cols").to_i]
+          end
+        end
+        old_winch = trap(:WINCH, &winch)
+        winch.call(nil)
 
         $stdin.raw! if $stdin.tty?
         stdin_thread = Thread.new { IO.copy_stream($stdin, w) }