terraform-path

#!/usr/bin/env bash
set -euo pipefail

XDG_CACHE_HOME="${XDG_CACHE_HOME:-${XDG_HOME:-${HOME}}/.cache}"
TF_INSTALL_VERSIONS_DIR="${XDG_CACHE_HOME}/terraform/versions"

find_up() {
    name="${1}"
    search_path="${PWD}"
    while [[ "${search_path}" != "" ]]; do
        if [[ -f "${search_path}/${name}" ]]; then
            echo "${search_path}/${name}"
            return 0
        fi
        search_path="${search_path%/*}"
    done
}

get_terraform_version() {
    local version_file="$(find_up ".terraform-version")"

    if [[ -z "${version_file}" ]]; then
        echo "TERRAFORM-PATH: No .terraform-version file found." >&2
        exit 100
    fi

    local version=$(< "${version_file}")

    if [[ -z "${version}" ]]; then
        echo "TERRAFORM-PATH: No version defined in version file." >&2
        exit 101
    fi
    echo "${version}"
}

get_terraform_binary_path() {
    local version=$(get_terraform_version)
    TF_BINARY_PATH="${TF_INSTALL_VERSIONS_DIR}/${version}/terraform"

    if [ ! -f "${TF_BINARY_PATH}" ]; then
        if [ "${TF_INSTALL_AUTO:-}" == "true" ]; then
                SCRIPT_DIR="${BASH_SOURCE[0]%/*}"
                source "${SCRIPT_DIR}/terraform-path"
                terraform-install
        fi
        if [ ! -f "${TF_BINARY_PATH}" ]; then
            echo "TERRAFORM-PATH: Terraform ${version} executable not found." >&2
            echo "TERRAFORM-PATH: You can install terraform by running 'terraform-install'" >&2
            echo "TERRAFORM-PATH: To auto-install terraform, you can also set TF_INSTALL_AUTO=true" >&2
            exit 102
        fi
    fi
    echo "${TF_BINARY_PATH}"
}

# echo if invoked directly
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    get_terraform_binary_path
fi