tflint.sh

#!/bin/bash -e

get_machine_arch () {
    machine_arch=""
    case $(uname -m) in
        i386)     machine_arch="386" ;;
        i686)     machine_arch="386" ;;
        x86_64)   machine_arch="amd64" ;;
        arm64)    machine_arch="arm64" ;;
        aarch64)  dpkg --print-architecture | grep -q "arm64" && machine_arch="arm64" || machine_arch="arm" ;;
    esac
    echo $machine_arch
}
arch=$(get_machine_arch)

echo "arch=$arch"

case "$(uname -s)" in
  Darwin*)
    os="darwin_${arch}"
    ;;
  MINGW64*)
    os="windows_${arch}"
    ;;
  MSYS_NT*)
    os="windows_${arch}"
    ;;
  *)
    os="linux_${arch}"
    ;;
esac

echo "os=$os"

echo -e "\n\n===================================================="

get_latest_release() {
  curl --silent "https://api.github.com/repos/terraform-linters/tflint/releases/latest" | # Get latest release from GitHub api
    grep '"tag_name":' |                                                                  # Get tag line
    sed -E 's/.*"([^"]+)".*/\1/'                                                          # Pluck JSON value
}

if [ -z "${TFLINT_VERSION}" ] || [ "${TFLINT_VERSION}" == "latest" ]; then
  echo "Looking up the latest version ..."
  version=$(get_latest_release)
else
  version=${TFLINT_VERSION}
fi

echo "Downloading TFLint $version"
curl --fail --silent -L -o /tmp/tflint.zip "https://github.com/terraform-linters/tflint/releases/download/${version}/tflint_${os}.zip"
retVal=$?
if [ $retVal -ne 0 ]; then
  echo "Failed to download tflint_${os}.zip"
  exit $retVal
else
  echo "Downloaded successfully"
fi

echo -e "\n\n===================================================="
echo "Unpacking /tmp/tflint.zip ..."
unzip /tmp/tflint.zip -d /tmp/
if [[ $os == "windows"* ]]; then
  dest="${TFLINT_INSTALL_PATH:-/bin}/"
  echo "Installing /tmp/tflint to ${dest}..."
  mv /tmp/tflint "$dest"
  retVal=$?
  if [ $retVal -ne 0 ]; then
    echo "Failed to install tflint"
    exit $retVal
  else
    echo "tflint installed at ${dest} successfully"
  fi
else
  dest="${TFLINT_INSTALL_PATH:-/usr/local/bin}/"
  echo "Installing /tmp/tflint to ${dest}..."
  
  if [[ -w "$dest" ]]; then SUDO=""; else
    # current user does not have write access to install directory
    SUDO="sudo";
  fi

  
  $SUDO mkdir -p "$dest"
  $SUDO install -c -v /tmp/tflint "$dest"
  retVal=$?
  if [ $retVal -ne 0 ]; then
    echo "Failed to install tflint"
    exit $retVal
  fi
fi

echo "Cleaning /tmp/tflint.zip and /tmp/tflint ..."
rm -f /tmp/tflint.zip /tmp/tflint

echo -e "\n\n===================================================="
echo "Current tflint version"
"${dest}/tflint" -v