a small bash script for updating proton-ge

protongup

#!/usr/bin/env bash

################
# protongup - a small bash script for updating proton-ge
################

## constants
_REPO="GloriousEggroll/proton-ge-custom"
_STEAMPATH="$HOME/.steam/root/compatibilitytools.d"

function clean_up() {
  cd "$_STEAMPATH/"
  rm -rf ./*.tar.gz ./*.sha512sum
}

function get_current_version() {
  ## check for current release
  if [ ! -f "$_STEAMPATH/proton-ge_version.txt" ]
  then
    echo "NULL"
  else
    cat "$_STEAMPATH/proton-ge_version.txt"
  fi
}

# https://gist.github.com/lukechilds/a83e1d7127b78fef38c2914c4ececc3c
function repo_api_request() {
  ## get info from latest release
  curl -fsSL "https://api.github.com/repos/$_REPO/releases/latest" |
    grep "\"$1\":" |
    sed -E 's/.*"([^"]+)".*/\1/'
}

function update_proton_ge() {
  _pwd=$(pwd) 
  mkdir -p "$_STEAMPATH"
  cd "$_STEAMPATH/"

  sum_url="$(repo_api_request browser_download_url | head -n 1)"
  download_url="$(repo_api_request browser_download_url | tail -n 1)"

  echo "downloading..."
  curl -fsSLO "$download_url"
  curl -fsSLO "$sum_url"

  echo "verifying..."
  if [ -z "$(sha512sum -c *.sha512sum 2>&1 | grep 'OK')" ]
  then
    echo "files failed to verify! cleaning up..."
    clean_up
  fi

  echo "extracting..."
  tar -xzf ./*.tar.gz -C "$_STEAMPATH/"

  echo "updating version number"
  echo "$newest_version" > "proton-ge_version.txt"

  echo "cleaning up..."
  clean_up

  echo "done."
  cd "$_pwd/"
}

## get versions
current_version=$(get_current_version 2>&1)
echo "current version is $current_version"

newest_version=$(repo_api_request tag_name 2>&1)
echo "newest version is $newest_version"

## check if updated is needed
if [ "$current_version" == "$newest_version" ]
then
  echo "proton-ge is already up to date."
  exit
## check if proton-ge is installed
elif [ "$current_version" == NULL ]
then
  echo "installing proton-ge for the first time..."
## update otherwise
else
  echo "proton-ge is out of date. getting the newest release..."
fi

update_proton_ge
exit