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https://github.com/robertpeteuil/terraform-installer

Installer for HashiCorp Terraform - Automatic Download, Extract and Install of Latest or Specific Version
https://github.com/robertpeteuil/terraform-installer

automated-deployment automation bash-script hashicorp hashicorp-downloads hashicorp-terraform installer linux macos terraform terraform-installer terraform-scripts windows

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Installer for HashiCorp Terraform - Automatic Download, Extract and Install of Latest or Specific Version

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# Installer for HashiCorp Terraform - Automated Installation

## Automatically Download, Extract and Install Latest or Specific Version

[![release](https://img.shields.io/github/release/robertpeteuil/terraform-installer.svg?colorB=2067b8)](https://github.com/robertpeteuil/terraform-installer)
[![bash](https://img.shields.io/badge/language-bash-89e051.svg?style=flat-square)](https://github.com/robertpeteuil/terraform-installer)
[![license](https://img.shields.io/github/license/robertpeteuil/terraform-installer.svg?colorB=2067b8)](https://github.com/robertpeteuil/terraform-installer)

---

**Note:** An updated script with additional capabilities and multi-product support has been published to the [hashicorp-installer](https://github.com/robertpeteuil/hashicorp-installer) repo. It defaults to installing Terraform and can be a drop-in replacement for this script.

---

The **terraform-install** script automates the process of downloading and installing Terraform. It provides an ideal method for installing installing updates or a specific version.

This script detects the latest version, OS and CPU-Architecture and allows installation to local or system locations. Optional parameters allow installing a specific version and installing to /usr/local/bin without prompting.

Example - install last pre-0.13 release: `./terraform-install.sh -i 0.12.29`

Options:

- `-i VERSION`: Install specific version
- `-a`: Automatically use `sudo` to install to /usr/local/bin
- allows for unattended installation via scripts or CD tools
- can be set as default behavior by uncommenting line 14 (`sudoInstall=true`)
- sudo password may be required unless NOPASSWD is enabled
- `-c`: leave binary in working directory (for CI/DevOps use)
- `-h`: help
- `-v`: display version

This installer is similar to my [Packer Installer](https://github.com/robertpeteuil/packer-installer) and [Vault Installer](https://github.com/robertpeteuil/vault-installer)

## Download and Use Locally

Download Installer

``` shell
curl -LO https://raw.github.com/robertpeteuil/terraform-installer/master/terraform-install.sh
chmod +x terraform-install.sh
```

Download installer via my bootstrap server (iac.sh or https://iac.sh)

``` shell
curl iac.sh/terraform > getinst.sh
bash getinst.sh
# installer downloaded as terraform-install.sh in current directory
```

### Run local installer

``` shell
./terraform-install.sh

# usage: terraform-install.sh [-i VERSION] [-a] [-c] [-h] [-v]
# -i VERSION : specify version to install in format '' (OPTIONAL)
# -a : automatically use sudo to install to /usr/local/bin
# -c : leave binary in working directory (for CI/DevOps use)
# -h : help
# -v : display vault-install.sh version
```

## System Requirements

- System with Bash Shell (Linux, macOS, Windows Subsystem for Linux)
- `unzip` - terraform downloads are in zip format
- `curl` or `wget` - script will use either one to retrieve metadata and download

Optional

- `jq` - if installed, latest version parsed from hashicorp downloads
- Useful if latest github release differs from version on hashicorp downloads
- Avoids github api limit of 60 requests per hour (unauthenticated)

## Script Process Details

- Determines Version to Download and Install
- Uses Version specified by `-i VERSION` parameter (if specified)
- Otherwise determines Latest Version
- If `jq` installed parse version from hashicorp downloads
- Otherwise use GitHub API to retrieve latest version
- Calculates Download URL based on Version, OS and CPU-Architecture
- Verifies URL Validity before Downloading in Case:
- VERSION incorrectly specified with `-i`
- Download URL Format Changed on terraform Website
- Determines Install Destination
- The destination can be specified with `-c` option, or passing `TF_INSTALL_DIR` environment variable
- The default is `/usr/local/bin` if it is writable, or with `-a`
- Otherwise the user is prompted for options
- Performed before Download/Install Process in case user selects `abort`
- Installation Process
- Download, Download SHA, Verify SHA of zip, Extract, Install, Cleanup and Display Results

### CPU Architecture Detection

CPU architecture is detected for each OS accordingly:

- Linux / Windows (WSL since this is a Bash script)
- detected with `lscpu` or by inspecting `/proc/cpuinfo`
- Arm variants use `arm` as it's the only `arm` version available (for now)
- macOS - uses Default Arch `amd64` as it's the only version available on macOS
- Default Value - `amd64`

## Disclaimer

I am a HashiCorp employee, but this is a personal project and not officially endorsed or supported by HashiCorp.

## License

Apache 2.0 License - Copyright (c) 2020 Robert Peteuil