Cannot function without a shell

[cottsay]

During the automated testing for the Fedora package for catkin_tools, it was discovered that context.py makes a call to the program stty. Without a shell, this program reports stty: standard input: Inappropriate ioctl for device, which causes ValueError: need more than 0 values to unpack.

Testing aside, this program should operate fine without a shell. Would it be appropriate to default to 80x24 if the call to stty fails?

Until this is fixed, I'm disabling automated testing for this package in Fedora.

[wjwwood]

@jbohren I think this is something you added, can you use this function which is already in catkin_tools in stead of calling out to stty:

https://github.com/catkin/catkin_tools/blob/master/catkin_tools/common.py#L258

It will gracefully fall back to 80 and also works on OS X and Windows.