terraform

#!/bin/bash

IMAGE=hashicorp/terraform
IMAGE_TAG=latest
TF_CONF=~/.terraform_conf
touch "$TF_CONF"
cat "$TF_CONF" | grep TERRAFORM_IMAGE > /dev/null 2>&1
if [[ "$?" == 1 ]];then
	/bin/bash -c "echo TERRAFORM_IMAGE=${IMAGE}:${IMAGE_TAG} >> ${TF_CONF}"
fi

get_help(){
	printf "Usage:\n"
	printf "\t config\t: Provide Terraform container version (e.g. terraform config 0.9.9) to override default 'latest'.\n"
	printf "\t --help\t: Show help from Terraform container.\n"
	printf "\t help\t: Show this help.\n"
	printf "\t shell\t: Open a shell in the Terraform container.\n"
	printf "\t * \t: Run Terraform container if no input passed to 'terraform'.\n"
	exit 0
}

# param $1 - Image tag
configure_image_version(){
    TERRAFORM_IMAGE_GIVEN_TAG=$1
    if [[ -z "$TERRAFORM_IMAGE_GIVEN_TAG" ]];then
        printf "ERROR: Provide a target Terraform version (e.g. 0.9.9, latest, etc.) to override the default 'latest' version.\n"
        exit 1
    else
        CUR_TAG=$(cat "$TF_CONF" | grep TERRAFORM_IMAGE | cut -d ":" -f2)
        sed -i -e "s/${CUR_TAG}/${TERRAFORM_IMAGE_GIVEN_TAG}/g" "$TF_CONF"
    fi
    TERRAFORM_IMAGE=$(terraform version)
    printf "Currently configured image tag is: ${TERRAFORM_IMAGE}.\n"
}

USER_INPUT_PARAM_1=$1
case "$USER_INPUT_PARAM_1" in
    config)
		USER_INPUT_PARAM_2=$2
		configure_image_version "$USER_INPUT_PARAM_2"
		;;
    help)
		get_help
		;;
    shell)
		TERRAFORM_IMAGE=$(cat "$TF_CONF" | grep TERRAFORM_IMAGE | cut -d "=" -f2)
		docker run -it --rm \
			-v "$PWD":"$PWD" \
			-v ~/.ssh:/root/.ssh \
			-v ~/.aws:/root/.aws \
			--workdir="$PWD" \
			--entrypoint=sh \
			"$TERRAFORM_IMAGE"
		;;
    *)
		TERRAFORM_IMAGE=$(cat "$TF_CONF" | grep TERRAFORM_IMAGE | cut -d "=" -f2)
		docker run -it --rm \
			-v "$PWD":"$PWD" \
			-v ~/.ssh:/root/.ssh \
			-v ~/.aws:/root/.aws \
			--workdir="$PWD" \
			"$TERRAFORM_IMAGE" \
			"${@:1}"
		;;
esac