Inappropriate Ioctl for Device GPG Error

Introduction

Are you trying to push or commit your code to Github/Git and when committing, notice that you're getting the error 'Inappropriate ioctl for device' error?

This is because you're using GPG (PGP) to sign your Git commits (hopefully this is intended as signing your commits allows your Git provider to know for certain a commit came from your machine).

Solution

This issue stems from a step being skipped when GPG support is enabled. According to the gpg-agent man pages, you should always add export GPG_TTY=$(tty) to your terminals initiation file. This is usually ~/.bashrc or ~/.zshrc.

Once you've added that line, if you try commit again, you'll find that the issue magically goes away!