Treat terminal as dumb if either stdout or stderr is not a tty

Fixes #3445

diff --git a/mkosi/sandbox.py b/mkosi/sandbox.py
index f265963bbb6abe87a9ff92ca1a1858782ae972f1..9949e0ee5719e9ba44418fe1373a7470274bcf12 100755 (executable)
--- a/mkosi/sandbox.py
+++ b/mkosi/sandbox.py
@@ -101,10 +101,7 @@ libc.fcntl.argtypes = (ctypes.c_int, ctypes.c_int, ctypes.c_int)
 
 
 def terminal_is_dumb() -> bool:
-    if not sys.stdout.isatty() and not sys.stderr.isatty():
-        return True
-
-    return os.getenv("TERM", "") == "dumb"
+    return not sys.stdout.isatty() or not sys.stderr.isatty() or os.getenv("TERM", "") == "dumb"
 
 
 class Style: