Created for updating or installing the Terraform for specific purposes when the destination is different than the default one. In this case the destination is /usr/loca/bin/ instead of default /usr/bin/

terraform-update.sh

#!/bin/bash

# Required system tools
SYSTEM_DEPS=(
    curl
    jq
    unzip
    wget
)

# Install missing dependencies
for SYSTEM_DEP in ${SYSTEM_DEPS[*]}; do
    if ! which $SYSTEM_DEP >/dev/null; then
        echo -e "[+] Installing missing dependency: $SYSTEM_DEP"
        sudo apt-get install -y $SYSTEM_DEP
    fi
done

# Retrieve latest terraform version
LATEST_RELEASE=$(curl -s https://checkpoint-api.hashicorp.com/v1/check/terraform | jq -r .current_version)
if [ $? -ne 0 ]; then
    echo "Error fetching latest Terraform version"
    exit 1
fi

# Check whether install or update is required
INSTALL_REQUIRED=0
if ! which terraform >/dev/null; then
    echo -e "'Terraform' tool not found"
    INSTALL_REQUIRED=1
else
    CURRENT_RELEASE=$(terraform version -json | jq -r .terraform_version 2>/dev/null)
    if [ $? -ne 0 ] || [[ ${LATEST_RELEASE} != $CURRENT_RELEASE ]]; then
        echo -e "'Terraform' tool is outdated"
        INSTALL_REQUIRED=1
    fi
fi

# Install latest version if required
if [[ $INSTALL_REQUIRED > 0 ]]; then
    echo "[+] Installing Terraform ${LATEST_RELEASE} ..."
    TEMP_FOLDER=$(mktemp -d -t terraform_install_XXXX)
    pushd ${TEMP_FOLDER}
    FILENAME=terraform_${LATEST_RELEASE}_linux_amd64.zip
    # Download latest version
    if ! wget https://releases.hashicorp.com/terraform/${LATEST_RELEASE}/$FILENAME; then
        echo "Failed to download Terraform"
        popd
        exit 1
    fi
    if ! unzip $FILENAME; then
        echo "Failed to unzip Terraform"
        popd
        exit 1
    fi
    rm $FILENAME
    # Extract and link executible in /usr/local/bin folder
    LINKED_TARGET="/usr/local/bin/terraform"
    BIN_TARGET="${LINKED_TARGET}-v${LATEST_RELEASE}"
    sudo mv terraform ${BIN_TARGET}
    sudo ln -sf ${BIN_TARGET} ${LINKED_TARGET}
    echo -e "Installation complete: ${LINKED_TARGET}"
    popd
    rm -r ${TEMP_FOLDER}
else
    echo "Latest version of Terraform (${LATEST_RELEASE}) already installed."
fi