#!/bin/bash

 

# Copyright OpenFaaS Author(s) 2022

 

set -e -x -o pipefail

 

export OWNER="openfaas"

export REPO="faasd"

 

version=""

 

echo "Finding latest version from GitHub"

version=$(curl -sI https://github.com/$OWNER/$REPO/releases/latest | grep -i "location:" | awk -F"/" '{ printf "%s", $NF }' | tr -d '\r')

echo "$version"

 

if [ ! $version ]; then

  echo "Failed while attempting to get latest version"

  exit 1

fi

 

SUDO=sudo

if [ "$(id -u)" -eq 0 ]; then

  SUDO=

fi

 

verify_system() {

  if ! [ -d /run/systemd ]; then

    fatal 'Can not find systemd to use as a process supervisor for faasd'

  fi

}

 

has_yum() {

  [ -n "$(command -v yum)" ]

}

 

has_apt_get() {

  [ -n "$(command -v apt-get)" ]

}

 

has_pacman() {

  [ -n "$(command -v pacman)" ]

}

 

install_required_packages() {

  if $(has_apt_get); then

    # Debian bullseye is missing iptables. Added to required packages

    # to get it working in raspberry pi. No such known issues in

    # other distros. Hence, adding only to this block.

    # reference: https://github.com/openfaas/faasd/pull/237

    $SUDO apt-get update -y

    $SUDO apt-get install -y curl runc bridge-utils iptables

  elif $(has_yum); then

    $SUDO yum check-update -y || :

    $SUDO yum install -y curl runc || :

  elif $(has_pacman); then

    $SUDO pacman -Syy

    $SUDO pacman -Sy curl runc bridge-utils

  else

    fatal "Could not find apt-get, yum, or pacman. Cannot install dependencies on this OS."

    exit 1

  fi

}

 

install_cni_plugins() {

  cni_version=v0.9.1

  suffix=""

  arch=$(uname -m)

  case $arch in

  x86_64 | amd64)

    suffix=amd64

    ;;

  aarch64)

    suffix=arm64

    ;;

  arm*)

    suffix=arm

    ;;

  *)

    fatal "Unsupported architecture $arch"

    ;;

  esac

 

  $SUDO mkdir -p /opt/cni/bin

  curl -sSL https://github.com/containernetworking/plugins/releases/download/${cni_version}/cni-plugins-linux-${suffix}-${cni_version}.tgz | $SUDO tar -xvz -C /opt/cni/bin

}

 

install_containerd() {

  arch=$(uname -m)

  CONTAINERD_VER=1.6.3

  case $arch in

  x86_64 | amd64)

    curl -sLSf https://github.com/containerd/containerd/releases/download/v${CONTAINERD_VER}/containerd-${CONTAINERD_VER}-linux-amd64.tar.gz | $SUDO tar -xvz --strip-components=1 -C /usr/local/bin/

    ;;

  armv7l)

    curl -sSL https://github.com/alexellis/containerd-arm/releases/download/v${CONTAINERD_VER}/containerd-${CONTAINERD_VER}-linux-armhf.tar.gz | $SUDO tar -xvz --strip-components=1 -C /usr/local/bin/

    ;;

  aarch64)

      curl -sLSf https://github.com/containerd/containerd/releases/download/v${CONTAINERD_VER}/containerd-${CONTAINERD_VER}-linux-arm64.tar.gz | $SUDO tar -xvz --strip-components=1 -C /usr/local/bin/

 

    ;;

  *)

    fatal "Unsupported architecture $arch"

    ;;

  esac

 

  $SUDO systemctl unmask containerd || :

  $SUDO curl -SLfs https://raw.githubusercontent.com/containerd/containerd/main/containerd.service --output /etc/systemd/system/containerd.service

  $SUDO systemctl enable containerd

  $SUDO systemctl start containerd

 

  sleep 5

}

 

install_faasd() {

  arch=$(uname -m)

  case $arch in

  x86_64 | amd64)

    suffix=""

    ;;

  aarch64)

    suffix=-arm64

    ;;

  armv7l)

    suffix=-armhf

    ;;

  *)

    echo "Unsupported architecture $arch"

    exit 1

    ;;

  esac

 

  $SUDO curl -fSLs "https://github.com/openfaas/faasd/releases/download/${version}/faasd${suffix}" --output "/usr/local/bin/faasd"

  $SUDO chmod a+x "/usr/local/bin/faasd"

 

  mkdir -p /tmp/faasd-${version}-installation/hack

  cd /tmp/faasd-${version}-installation

  $SUDO curl -fSLs "https://raw.githubusercontent.com/openfaas/faasd/${version}/docker-compose.yaml" --output "docker-compose.yaml"

  $SUDO curl -fSLs "https://raw.githubusercontent.com/openfaas/faasd/${version}/prometheus.yml" --output "prometheus.yml"

  $SUDO curl -fSLs "https://raw.githubusercontent.com/openfaas/faasd/${version}/resolv.conf" --output "resolv.conf"

  $SUDO curl -fSLs "https://raw.githubusercontent.com/openfaas/faasd/${version}/hack/faasd-provider.service" --output "hack/faasd-provider.service"

  $SUDO curl -fSLs "https://raw.githubusercontent.com/openfaas/faasd/${version}/hack/faasd.service" --output "hack/faasd.service"

  $SUDO /usr/local/bin/faasd install

}

 

install_caddy() {

  if [ ! -z "${FAASD_DOMAIN}" ]; then

    arch=$(uname -m)

    case $arch in

    x86_64 | amd64)

      suffix="amd64"

      ;;

    aarch64)

      suffix=-arm64

      ;;

    armv7l)

      suffix=-armv7

      ;;

    *)

      echo "Unsupported architecture $arch"

      exit 1

      ;;

    esac

 

    curl -sSL "https://github.com/caddyserver/caddy/releases/download/v2.4.3/caddy_2.4.3_linux_${suffix}.tar.gz" | $SUDO tar -xvz -C /usr/bin/ caddy

    $SUDO curl -fSLs https://raw.githubusercontent.com/caddyserver/dist/master/init/caddy.service --output /etc/systemd/system/caddy.service

 

    $SUDO mkdir -p /etc/caddy

    $SUDO mkdir -p /var/lib/caddy

   

    if $(id caddy >/dev/null 2>&1); then

      echo "User caddy already exists."

    else

      $SUDO useradd --system --home /var/lib/caddy --shell /bin/false caddy

    fi

 

    $SUDO tee /etc/caddy/Caddyfile >/dev/null <<EOF

{

  email "${LETSENCRYPT_EMAIL}"

}

 

${FAASD_DOMAIN} {

  reverse_proxy 127.0.0.1:8080

}

EOF

 

    $SUDO chown --recursive caddy:caddy /var/lib/caddy

    $SUDO chown --recursive caddy:caddy /etc/caddy

 

    $SUDO systemctl enable caddy

    $SUDO systemctl start caddy

  else

    echo "Skipping caddy installation as FAASD_DOMAIN."

  fi

}

 

install_faas_cli() {

  curl -sLS https://cli.openfaas.com | $SUDO sh

}

 

verify_system

install_required_packages

 

$SUDO /sbin/sysctl -w net.ipv4.conf.all.forwarding=1

echo "net.ipv4.conf.all.forwarding=1" | $SUDO tee -a /etc/sysctl.conf

 

install_cni_plugins

install_containerd

install_faas_cli

install_faasd

install_caddy