install

#!/bin/sh

set -e

die() {
    echo "Fatal error: $*" >&2
    echo "OS: '$os', Arch: '$arch', uname: '$(uname -a)'" >&2
    exit 1
}

os=$(
    uname | awk '{print tolower($0)}'
)

arch=$(
    case $(uname -m) in x86_64) echo -n amd64 ;; aarch64) echo -n arm64 ;; *) echo -n $(uname -m) ;; esac
)

latest_package_urls() {
    curl -s https://api.github.com/repos/crowdstrike/gofalcon/releases/latest | grep '"browser_download_url":' | sed 's/"$//g ; s/^.*browser_download_url": "//g'
}

package_discriminator=$(
    case "${os}" in
        darwin)
            if [ "$arch" = "amd64" ]; then
                echo "macOS"
            else
                die "Unsupported architecture"
            fi
            ;;
        linux)
            pkg_arch=$(
                echo "$arch" | sed s/amd64/x86_64/g
            )

            if type rpm > /dev/null 2>&1; then
                echo "${pkg_arch}.rpm"
            elif type dpkg > /dev/null 2>&1; then
                echo "${pkg_arch}.deb"
            else
                die "Unsupported packaging system"
            fi
            ;;
        *)
            die "Unsupported OS"
            ;;
    esac
)
package_url=$(
    latest_package_urls | grep "$package_discriminator"
)

package_install() {
    pkg=$1
    if type dnf > /dev/null 2>&1; then
        dnf install -q -y "$pkg" || rpm -ivh --nodeps "$pkg"
    elif type yum > /dev/null 2>&1; then
        yum install -q -y "$pkg" || rpm -ivh --nodeps "$pkg"
    elif type zypper > /dev/null 2>&1; then
        zypper --quiet install -y "$pkg" || rpm -ivh --nodeps "$pkg"
    elif type rpm > /dev/null 2>&1; then
        rpm -ivh --nodeps "$pkg"
    elif type apt-get > /dev/null 2>&1; then
        file=$(curl -w "%{filename_effective}" -LO "$pkg")
        dpkg -i "$file"
        rm "$file"
    else
        die "Unsupported packaging system"
    fi
}

package_install "$package_url"

echo "   )"
echo "  (__"
echo "  _  )_"
echo " (_)_(_)      Gofalcon examples installed"
echo "  (o o)       Use 'falcon_<<TAB>>' to discover installed binaries"
echo " ==\\o/=="