frp-install.sh

#!/bin/bash

abort() {
  printf "%s\n" "$@" >&2
  exit 1
}

if test -d "/usr/local/frp"
then abort "Error: /usr/local/frp already exists"
fi

execute() {
  if ! "$@"
  then abort "$(printf "Failed: %s" "$@")"
  fi
}

execute_root() {
  execute "sudo" "$@"
}

if ! command -v curl > /dev/null
then
  echo "cURL is not available, installing..."
  execute_root "apt" "install" "-y" "curl"
fi
latest_release=$(curl -s "https://api.github.com/repos/fatedier/frp/releases/latest" | grep -o '"tag_name": "[^"]*' | grep -o '[^"]*$' | cut -c 2-)
if test -z "$latest_release"
then abort "Error: Failed to retrieve the latest release"
fi
filename="frp_${latest_release}_$(uname -s | tr "[:upper:]" "[:lower:]")_$(uname -m | sed "s/x86_64/amd64/g" | sed "s/aarch/arm/g")"
echo "Downloading ${filename}.tar.gz..."
execute_root "wget" "-O" "frp.tar.gz" "https://github.com/fatedier/frp/releases/download/v${latest_release}/${filename}.tar.gz"
echo "Extracting..."
execute_root "tar" "-xzvf" "frp.tar.gz"
echo "Moving ${filename} to /usr/local/frp..."
execute_root "mv" "${filename}" "/usr/local/frp"
echo "Cleaning up..."
execute_root "rm" "frp.tar.gz"