install_aws_sam_cli.sh

#!/usr/bin/env bash

set -e

VERSION=${VERSION:-"latest"}
VERBOSE=${VERBOSE:-"true"}

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if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

apt_get_update()
{
    if [ "$(find /var/lib/apt/lists/* | wc -l)" = "0" ]; then
        echo "Running apt-get update..."
        apt-get update -y
    fi
}

# Checks if packages are installed and installs them if not
check_packages() {
    if ! dpkg -s "$@" > /dev/null 2>&1; then
        apt_get_update
        apt-get -y install --no-install-recommends "$@"
    fi
}

export DEBIAN_FRONTEND=noninteractive

check_packages curl ca-certificates gpg dirmngr unzip bash-completion less

verify_aws_sam_cli_gpg_signature() {
    local filePath=$1
    local sigFilePath=$2
    tmp_dir="$(mktemp -d)"
    trap 'rm -rf "${tmp_dir}"' EXIT
    local awsGpgKeyring="${tmp_dir}/aws-sam-cli-public-key.gpg"

    echo "${PRIMARY_PUBLIC_KEY}" | gpg --dearmor > "${awsGpgKeyring}"
    echo "${SIGNER_PUBLIC_KEY}" | gpg --dearmor >> "${awsGpgKeyring}"

    gpg --batch --quiet --no-default-keyring --keyring "${awsGpgKeyring}" --verify "${sigFilePath}" "${filePath}"
    local status=$?

    return ${status}
}

install() {
    tmp_dir="$(mktemp -d)"
    trap 'rm -rf "${tmp_dir}"' EXIT

    local scriptZipFile="${tmp_dir}/aws-sam-cli.zip"
    local scriptSigFile="${tmp_dir}/aws-sam-cli.sig"

    architecture=$(dpkg --print-architecture)
    case "${architecture}" in
        amd64) architectureStr=x86_64 ;;
        arm64) architectureStr=arm64 ;;
        *)
            echo "AWS SAM CLI does not support machine architecture '$architecture'. Please use an x86-64 or ARM64 machine."
            exit 1
    esac
    local scriptUrl=https://github.com/aws/aws-sam-cli/releases/download/${VERSION}/aws-sam-cli-linux-${architectureStr}.zip
    echo "Downloading AWS SAM CLI from ${scriptUrl}..."
    curl -fsSL "${scriptUrl}" -o "${scriptZipFile}"
    curl -fsSL "${scriptUrl}.sig" -o "${scriptSigFile}"

    verify_aws_sam_cli_gpg_signature "$scriptZipFile" "$scriptSigFile"
    if (( $? > 0 )); then
        echo "Could not verify GPG signature of AWS CLI install script. Make sure you provided a valid version."
        exit 1
    fi
    echo "GPG signature of AWS SAM CLI install script verified successfully. Installing..."
    unzip -q "${scriptZipFile}" -d "${tmp_dir}/aws-sam-cli"
    "${tmp_dir}/aws-sam-cli/install"

    echo "AWS SAM CLI installed successfully."
}

echo "(*) Installing AWS SAM CLI..."

install

# Clean up
rm -rf /var/lib/apt/lists/*

echo "Done!"