Terraform Update / Via Powershell

tfupdate.ps1

# This script updates Terraform to the latest version available from HashiCorp.
# It checks the current version, downloads the latest version if necessary, 
# and replaces the existing binary. It also backs up the current version.
# Ensure you have the required permissions to run this script and modify the installation directory.

# Created by: John Wildes with the helpf of GitHub Copilot
# Date: 2025-04-03 
# Description: Update Terraform to the latest version

# Add a parameter for the installation directory
param (
    [string]$InstallDir = "C:\Tools",
    [switch]$Install = $false
)

# Update the script to use the parameter for the installation directory
$terraformExe = Join-Path $InstallDir "terraform.exe"

# Check if Terraform is installed
if (Test-Path $terraformExe) {
    # Get the current Terraform version
    $currentVersion = & $terraformExe -version | Select-String -Pattern "Terraform v([\d\.]+)" | ForEach-Object { $_.Matches.Groups[1].Value }
    Write-Host "Current Terraform version: $currentVersion"
} else {
    Write-Host "Terraform is not installed in $InstallDir."
    $currentVersion = $null
    
    # If Install switch is not provided and Terraform doesn't exist, exit
    if (-not $Install) {
        Write-Host "Use -Install switch to install Terraform if it's not found."
        return
    }
    
    Write-Host "Will install the latest version of Terraform..."
}

# Fetch the latest Terraform version from HashiCorp's releases
$latestVersion = Invoke-WebRequest -Uri "https://releases.hashicorp.com/terraform/" -UseBasicParsing | Select-String -Pattern "terraform/([\d\.]+)/" | ForEach-Object { $_.Matches.Groups[1].Value } | Sort-Object -Descending | Select-Object -First 1
Write-Host "Latest Terraform version: $latestVersion"

# Compare versions if Terraform is already installed
if ($currentVersion -eq $latestVersion) {
    Write-Host "You already have the latest version of Terraform installed."
    return
}

# Create installation directory if it doesn't exist
if (-not (Test-Path $InstallDir)) {
    Write-Host "Creating installation directory: $InstallDir"
    New-Item -Path $InstallDir -ItemType Directory -Force | Out-Null
}

# Prepare the download URL and file paths
$downloadUrl = "https://releases.hashicorp.com/terraform/$latestVersion/terraform_${latestVersion}_windows_amd64.zip"
$zipFile = Join-Path $InstallDir "terraform_${latestVersion}.zip"

# Download the latest Terraform release
Write-Host "Downloading Terraform $latestVersion..."
Invoke-WebRequest -Uri $downloadUrl -OutFile $zipFile

# Backup the current version if it exists
if (Test-Path $terraformExe) {
    $backupName = "terraform.$((Get-Date).ToString('ddMM'))"
    Rename-Item -Path $terraformExe -NewName $backupName
    Write-Host "Backed up current Terraform to $backupName"
}

# Extract the new Terraform binary
Write-Host "Extracting Terraform $latestVersion..."
Expand-Archive -Path $zipFile -DestinationPath $InstallDir -Force

# Clean up the downloaded zip file
Remove-Item $zipFile
Write-Host "Terraform $latestVersion installed successfully in $InstallDir."

I know that you can get terraform installed on windows with winget, and this script is extremely brittle and only focused on the windows OS. However, I'm old. I have a folder called Tools and this is added to my path statement. A hold over from when I ran MS-DOS as a kid. So I gin'd up this script using copilot to help keep terraform up to date without having to manually go and do it myself.