The simplest terraform version manager script you've ever seen

README.md

The simplest terraform version manager script you've ever seen

These two scripts provide the bare-minimum version-manager capability for terraform.

Installation:

1. Put both files somewhere on your PATH
2. chmod +x on both files to make them executable

Usage:

Anywhere the scripts find a '.terraform-version' file, they'll assume you want to have that version enabled in that directory and all subdirectories.

terraform

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

TF_VERSIONS_DIR=~/.cache/terraform-versions

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

version_file=$(find_up .terraform-version)

if [[ -z $version_file ]]; then
	echo "No .terraform-version file found." >&2
	exit 1
fi
version=$(cat "$version_file")

if [[ -z "$version" ]]; then
	echo "No version defined in $version" >&2
	exit 1
fi

if [[ ! -d $TF_VERSIONS_DIR ]]; then
	echo "Terraform version $version not found in $TF_VERSIONS_DIR" >&2
	echo "You can install terraform by running 'terraform-install'" >&2
	exit 1
fi

if ! comm -1 -2 <(echo $version) <(ls -1 $TF_VERSIONS_DIR | sort) >/dev/null; then
	echo "Terraform version $version not found in $TF_VERSIONS_DIR" >&2
	echo "You can install terraform by running 'terraform-install'" >&2
	exit 1
fi

if [[ ! -f $TF_VERSIONS_DIR/$version/terraform ]]; then
	echo "Terraform executable not found for version $version in $TF_VERSIONS_DIR" >&2
	echo "You can install terraform by running 'terraform-install'" >&2
	exit 1
fi

exec "$TF_VERSIONS_DIR/$version/terraform" "$@"

terraform-install

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

TF_VERSIONS_DIR=~/.cache/terraform-versions

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

version_file=$(find_up .terraform-version)

if [[ -z $version_file ]]; then
    echo "No .terraform-version file found." >&2
    exit 1
fi

version=$(cat "$version_file")

if [[ -z "$version" ]]; then
    echo "No Terraform version defined in $version" >&2
    exit 1
fi

if [[ -f "$TF_VERSIONS_DIR/$version/terraform" ]]; then
    echo "Terraform version $version already installed at $TF_VERSIONS_DIR/$version" >&2
    exit 1
fi

mkdir -p $TF_VERSIONS_DIR/$version
tempfile=$(mktemp)
trap "rm -rf $tempfile" EXIT

# Determine arch
case $(uname -s) in
Darwin*) os=darwin ;;
MSYS_NT* | CYGWIN_NT* | MINGW64*) os=windows ;;
FreeBSD*) os=freebsd ;;
OpenBSD*) os=openbsd ;;
Linux*) os=linux ;;
*)
    echo "Unsupported OS: $(uname -s)" >&2
    exit 1
    ;;
esac

case $(uname -m) in
x86_64 | amd64) arch=amd64 ;;
arm64 | aarch64) arch=arm64 ;;
*)
    echo "Unsupported Arch: $(uname -m)" >&2
    exit 1
    ;;
esac

url="https://releases.hashicorp.com/terraform/${version}/terraform_${version}_${os}_${arch}.zip"
echo "Downloading $url" >&2
curl "$url" -# -o $tempfile
unzip -d $TF_VERSIONS_DIR/$version $tempfile >/dev/null
echo "Terraform $version installed at $TF_VERSIONS_DIR/$version/terraform" >&2