a script to run the right version of terraform for the current repository

terraform wrapper

#!/bin/bash
# this script expects to find each terraform version binary available in the path
# with the filename format terraform_0.x.x
#
# requires jq
# doesn't currently support reading states in terraform workspaces

function die {
  echo $1
  exit 1
}

if test -e .terraform_version ; then
  tfver=$(cat .terraform_version | grep -Eo '[0-9.]+')
else
  test -e terraform.tfstate || die "no terraform.tfstate file found, can't find version"
  tfver=$(jq -r .terraform_version terraform.tfstate | grep -Eo '[0-9.]+')
fi
exec terraform_$tfver $@