Inputfalse

[lkysow]

From @austinorth in #276 with fixed tests

fixes #268

Motivation

Atlantis needs to fail quickly and gracefully when user input is not provided for variables that are lacking a value.

What I Did

• Added the -input=false flag to init, plan and apply step runners. This flag is recommended by Hashicorp here.
• Added that same flag to the corresponding test files.

Difference in Output

Before Flag Added

exit status 1: running "sh -c terraform plan -refresh -no-color -out /home/<username>/.atlantis/repos/<repo> -var atlantis_user=austinorth" in "<directory>"
var.some_variable
  Enter a value: 
var.some_variable
  Enter a value: 
var.some_variable
  Enter a value: 
var.some_variable
  Enter a value: 

Error: Error asking for user input: missing required value for "some_variable"

After Flag Added

exit status 1: running "exit status 1: running "sh -c terraform plan -input=false -refresh -no-color -out /home/<username>/.atlantis/repos/<repo> -var atlantis_user=austinorth" in "<directory>"

Error: Required variable not set: some_variable