install-rtl_433-app

#!/bin/bash

# https://serverfault.com/a/670812 # github.com/gdbtek
# some function credits here go to Nam Nguyen for clean
# bash support functions. The functions here are under MIT license

function have_command()
{
	info "checking for command: $1"
	which $1 > /dev/null 2>&1
	if [ $? -eq 0 ]; then
		echo -e "\e[32mfound command: $1 \e[39m" && return 0
	else
		echo -e "\e[36missing command $1 \e[39m" && return 1
	fi	
}

function info()
{
    local -r message="${1}"

    echo -e "\033[1;36m${message}\033[0m" 2>&1
}

function trimString()
{
    local -r string="${1}"

    sed 's,^[[:blank:]]*,,' <<< "${string}" | sed 's,[[:blank:]]*$,,'
}

function isEmptyString()
{
    local -r string="${1}"

    if [[ "$(trimString "${string}")" = '' ]]
    then
        echo 'true' && return 0
    fi

    echo 'false' && return 1
}

function getLastAptGetUpdate()
{
    local aptDate="$(stat -c %Y '/var/cache/apt')"
    local nowDate="$(date +'%s')"

    echo $((nowDate - aptDate))
}

function runAptGetUpdate()
{
    local updateInterval="${1}"

    local lastAptGetUpdate="$(getLastAptGetUpdate)"

    if [[ "$(isEmptyString "${updateInterval}")" = 'true' ]]
    then
        # Default To 24 hours
        updateInterval="$((24 * 60 * 60))"
    fi

    if [[ "${lastAptGetUpdate}" -gt "${updateInterval}" ]]
    then
        info "apt-get update"
        sudo apt-get update -m
    else
        local lastUpdate="$(date -u -d @"${lastAptGetUpdate}" +'%-Hh %-Mm %-Ss')"

        info "\nSkip apt-get update because its last run was '${lastUpdate}' ago"
    fi
}

function checkAptPackage()
{
  local -r package="${1}"
  dpkg -s ${package} > /dev/null 2>&1
  if [ $? -eq 0 ]; then
    echo "${package} already installed"
    return 0
  else
    echo "${package} not installed"
    return 1
  fi
}

function installAptPackage()
{
  local -r package="${1}"
  checkAptPackage ${package}
  if [ $? -eq 1 ]; then
    sudo apt install ${package}
  fi
}

function installAptPackages()
{
  local -r requested_packages=${@}
  local install_packages=()
  for pkg in $requested_packages; do
    checkAptPackage ${pkg}
    if [ $? -eq 1 ]; then
      install_packages+=($pkg)
    fi
  done
  if [[ ${#install_packages} > 0 ]]; then
    packages=$(IFS=" " eval 'echo "${install_packages[*]}"')
    echo "packages that need installing: ${packages}"
    sudo apt install ${packages}
  fi
}

function install_rtl_433() {
  echo "installing build dependancies"
  runAptGetUpdate
  installAptPackages libtool libusb-1.0-0-dev librtlsdr-dev rtl-sdr build-essential autoconf cmake pkg-config git

  if [ ! -d apps ]; then
    echo "creating an apps dir for rtl_433 application clone"
	  mkdir apps
  else
    cd apps
  fi

  if [ ! -d rtl_433 ]; then
    echo "cloning latest merbanan/rtl_433"
	  git clone https://github.com/merbanan/rtl_433.git 
	  cd rtl_433
  else
    echo "found existing clone fo rtl_433 -- updating with: git pull"
    cd rtl_433
    git pull
  fi

  if [ ! -d build ]; then
	  mkdir build
  fi
  pushd .
  cd build
  cmake ../
  if [ $? -eq 1 ]; then
	  echo "cmake failed - debug that"
	  exit 1
  fi

  make
  if [ $? -eq 1 ]; then
	  echo "make failed - debug that"
	  exit 1
  fi
  
  sudo make install
  if [ $? -eq 1 ]; then
	  echo "make install failed - debug that"
	  exit 1
  else
	  echo "rtl_433 tools installed into /usr/local/"
  fi
  popd
}

if [ ! -f /etc/modprobe.d/blacklist-rtl.conf ]; then
	echo "blacklist dvb_usb_rtl28xxu" | sudo tee -a /etc/modprobe.d/blacklist-rtl.conf
	echo "blacklist file added - you need to reboot later"
fi

if [ "${1}" == "force" ]; then
  echo "forcing install"
	install_rtl_433 force
elif have_command rtl_433; then
	echo "rtl_433 detected - skipping install - add the 'force' option like so:"
  echo "     ./install-rtl_433-app force"
  exit 
else
  echo "rtl_433 not detected - attempting to install"
	install_rtl_433
  echo "install completed"
fi