Install script for the Swift Community Apt Repository - https://archive.swiftlang.xyz

swift-apt-repo-install.sh

#! /bin/bash
#
# Install script for the Swift Community Apt Repository - swiftlang.xyz
#

# check distribution version and infer distro with switch/case
## as all distribution versions have different names we can use this information to infer the distribution name.
check_ver () {
  for var in "${SUPPORTED_VER[@]}"
  do
    if grep -q $var tmp_sources.txt;
    then
      vers=$var
      case $vers in
            bionic|focal|hirsute|impish) dist="ubuntu";;
            buster|bullseye) dist="debian";;
      esac
      break
    fi
  done
}

## raspbian is an edge case
## check for raspbian
check_raspbian () {
  if grep -q "raspbian" tmp_sources.txt;
  then
    dist="raspbian"
  fi
}

## check if dist/version is supported
check_supported () {
    if [ $dist == "unsupported" ] || [ $vers == "unsupported" ]
    then
    echo sorry your system is unsupported.
    echo
    exit 0
    fi
}

## user_input allows the selection of the available repository sections
## this will vary depending on which Ubuntu/Debian distribution is installed

user_input_all () {
  # User Input
  # # For distributions with release versions from v5.4.* and developer snapshots available.
  echo
  echo "--------------- Choose Swift Release Version ---------------"
  echo
  echo " If you always want to have the latest release/stable version of Swift available choose [1], if not, choose the version most suitable for your project. "
  echo " The latest release/stable version of Swift is currently 5.5 "
  echo
  echo "---------------------------------------------------------"
  echo
  echo "  1) latest/main - This will update to the latest release/stable version of Swift available"
  echo "  2) developer - Swift developer builds - this will update to the latest developer build available"
  echo "  3) Swift version 5.3.* - this will update to the latest point/patch release of Swift 5.3"
  echo "  4) Swift version 5.4.* - this will update to the latest point/patch release of Swift 5.4"
  echo "  5) Swift version 5.5.* - this will update to the latest point/patch release of Swift 5.5"
  echo
  echo "---------------------------------------------------------"
  echo
  read -r -p "Enter number [1/2/3/...] : " n < /dev/tty
  echo
  case $n in
    1) main=" main"; echo "Installing the Swift main/latest repository"; echo;;
    2) dev=" dev"; main=""; echo "Installing the Swift developer repository"; echo;;
    3) v5_3=" v5_3"; main=""; echo "Installing the Swift version 5.3.* repository"; echo;;
    4) v5_4=" v5_4"; main=""; echo "Installing the Swift version 5.4.* repository"; echo;;
    5) v5_5=" v5_5"; main=""; echo "Installing the Swift version 5.5.* repository"; echo;;
    *) echo "Invalid option"; echo; exit 1;;
  esac
}

user_input_from_5_4 () {
  # User Input
  # # For distributions with release versions from v5.4.* and developer snapshots available.
  echo
  echo "--------------- Choose Swift Release Version ---------------"
  echo
  echo " If you always want to have the latest release/stable version of Swift available choose [1], if not, choose the version most suitable for your project. "
  echo " The latest release/stable version of Swift is currently 5.5 "
  echo
  echo "---------------------------------------------------------"
  echo
  echo "  1) latest/main - This will update to the latest/stable release of Swift available"
  echo "  2) developer - Swift developer builds - this will update to the latest developer build available"
  echo "  3) Swift version 5.4.* - this will update to the latest point/patch release of Swift 5.4"
  echo "  4) Swift version 5.5.* - this will update to the latest point/patch release of Swift 5.5"
  echo
  echo "---------------------------------------------------------"
  echo
  read -r -p "Enter number [1/2/3/...] : " n < /dev/tty
  echo
  case $n in
    1) main=" main"; echo "Installing the Swift main/latest repository"; echo;;
    2) dev=" dev"; main=""; echo "Installing the Swift developer repository"; echo;;
    3) v5_4=" v5_4"; main=""; echo "Installing the Swift version 5.4.* repository"; echo;;
    4) v5_5=" v5_5"; main=""; echo "Installing the Swift version 5.5.* repository"; echo;;
    *) echo "Invalid option"; echo; exit 1;;
  esac
}

## check curl is installed
curl_check () {
  echo "Checking for curl..."
  if command -v curl > /dev/null; then
    echo "Detected curl..."
  else
    echo -n "Installing curl... "
    apt-get install -q -y curl &> /dev/null
    echo "done."
    if [ "$?" -ne "0" ]; then
      echo "Unable to install curl! Your base system has a problem; please check your default OS's package repositories because curl should work."
      echo "Repository installation aborted."
      exit 1
    fi
  fi
}

## check gpg is installed
gpg_check () {
  echo "Checking for gpg..."
  if command -v gpg > /dev/null; then
    echo "Detected gpg..."
  else
    echo -n "Installing gnupg for GPG verification... "
    apt-get install -y gnupg &> /dev/null
    echo "done."
    if [ "$?" -ne "0" ]; then
      echo "Unable to install GPG! Your base system has a problem; please check your default OS's package repositories because GPG should work."
      echo "Repository installation aborted."
      exit 1
    fi
  fi
}

install_debian_keyring () {
  if [ "${dist}" = "debian" ]; then
    echo "Installing debian-archive-keyring which is needed for installing "
    echo "apt-transport-https on many Debian systems."
    apt-get install -y debian-archive-keyring &> /dev/null
  fi
}

file_check () {
  if [ -f "$apt_source_path" ]
  then
    rm $apt_source_path
  fi
}

main() {
    # default repo values
    v5_3=""
    v5_4=""
    v5_5=" v5_5"
    main=""
    dev=""
    # default values
    gpg_key_url="https://archive.swiftlang.xyz/swiftlang_repo.gpg.key"
    apt_source_path="/etc/apt/sources.list.d/swiftlang-release.list"
    # SUPPORTED_DIST=('ubuntu' 'debian' 'raspbian')
    SUPPORTED_VER=('bionic' 'focal' 'hirsute' 'impish' 'buster' 'bullseye')
    # default to unsupported
    dist="unsupported"
    vers="unsupported"
    # ----
    # run apt update
    echo -n "running update... "
    apt-get update > tmp_sources.txt
    echo "done."
    # scan tmp_sources.txt
    echo -n "scanning sources... "
    #check_dist
    check_ver
    check_raspbian
    echo "done."
    # clean tmp file
    rm tmp_sources.txt
    # check if system is supported - if not - exit
    check_supported
    # if ok continue with install
    # ----
    echo system detected is compatible with $dist/$vers
    echo
    # check prerequisists
    curl_check
    gpg_check
    install_debian_keyring
    echo -n "Installing apt-transport-https... "
    apt-get install -y apt-transport-https &> /dev/null
    echo "done."
    # import the gpg key
    echo -n "Importing swiftlang gpg key... "
    curl -L "${gpg_key_url}" 2> /dev/null | apt-key add - &>/dev/null
    echo "done."
    # user input
#     if [ "${dist}" != "raspbian" ];
#     then
#         case $vers in
#             bionic|focal|buster) user_input_all;;
#             *) user_input_from_5_4;;
#         esac
#     fi
    # add source list file
    echo -n "Installing $apt_source_path... "
    file_check
    echo -n "https://archive.swiftlang.xyz/$dist/ $vers$v5_5"
    echo "deb https://archive.swiftlang.xyz/$dist/ $vers$v5_5" > $apt_source_path
    # echo "deb https://swiftlang.xyz/$dist/ $vers$v5_3$v5_4$v5_5$main$dev" >> $apt_source_path
    echo "done."
    #
    echo -n "Running apt-get update... "
  # update apt on this system
  apt-get update &> /dev/null
  echo "done."

  echo
  echo "The repository is setup!"
  echo "You can now install swift using 'sudo apt install swiftlang' "
  echo
}

main