commit 20d152b8d86d84259f382aef3a0d10d489bf17cb
author Jerome Forissier <jerome@forissier.org> Wed Sep 25 20:28:33 2019 +0200
committer Jérôme Forissier <jerome@forissier.org> Thu Sep 26 23:52:24 2019 +0200
tree 9e9c9e37f555973a96479ae2449e868abbccb145
parent 8744ddb3b7ca38dcee01867b2201ebba3853c312

symbolize.py: fix exception when stdin is not a terminal

Commit 6b4fc6752b3c ("symbolize.py: disable terminal local echo") uses
termios functions on stdin unconditionally. Unfortunately, this will
cause an exception when stdin is not a terminal, for instance:

 $ echo Hello | ./script/symbolize.py
 Traceback (most recent call last):
   File "./scripts/symbolize.py", line 497, in <module>
     main()
   File "./scripts/symbolize.py", line 484, in main
     old = termios.tcgetattr(fd)
 termios.error: (25, 'Inappropriate ioctl for device')

Fix the issue by making sure stdin is a TTY before using the termios
functions.

Fixes: 6b4fc6752b3c ("symbolize.py: disable terminal local echo")
Signed-off-by: Jerome Forissier <jerome@forissier.org>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>