cooker.py: Only try to change terminal flags on terminals

1 files changed, 9 insertions, 6 deletions

diff --git a/lib/bb/cooker.py b/lib/bb/cooker.py
index 6ee6f07d4..0eda9eed9 100644
--- a/lib/bb/cooker.py
+++ b/lib/bb/cooker.py
@@ -76,12 +76,15 @@ class BBCooker:
         #
         # TOSTOP must not be set or our children will hang when they output
         #
-        import termios
-        tcattr = termios.tcgetattr(sys.stdout.fileno())
-        if tcattr[3] & termios.TOSTOP:
-            bb.msg.note(1, bb.msg.domain.Build, "The terminal had the TOSTOP bit set, clearing...")
-            tcattr[3] = tcattr[3] & ~termios.TOSTOP
-            termios.tcsetattr(sys.stdout.fileno(), termios.TCSANOW, tcattr)
+        fd = sys.stdout.fileno()
+        if os.isatty(fd):
+            import termios
+            tcattr = termios.tcgetattr(fd)
+            if tcattr[3] & termios.TOSTOP:
+                bb.msg.note(1, bb.msg.domain.Build, "The terminal had the TOSTOP bit set, clearing...")
+                tcattr[3] = tcattr[3] & ~termios.TOSTOP
+                termios.tcsetattr(fd, termios.TCSANOW, tcattr)
+
 
     def tryBuildPackage(self, fn, item, task, the_data, build_depends):
         """