sunshine: add updater script

pkgs/servers/sunshine/default.nix

@@ -153,6 +153,8 @@ stdenv.mkDerivation rec {
       --set LD_LIBRARY_PATH ${lib.makeLibraryPath [ vulkan-loader ]}
   '';
 
+  passthru.updateScript = ./updater.sh;
+
   meta = with lib; {
     description = "Sunshine is a Game stream host for Moonlight.";
     homepage = "https://github.com/LizardByte/Sunshine";

pkgs/servers/sunshine/updater.sh

@@ -0,0 +1,23 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p gnugrep gnused coreutils curl wget jq nix-update prefetch-npm-deps nodejs
+
+set -euo pipefail
+pushd "$(dirname "${BASH_SOURCE[0]}")"
+
+version=$(curl -s "https://api.github.com/repos/LizardByte/sunshine/tags" | jq -r .[0].name | grep -oP "^v\K.*")
+url="https://raw.githubusercontent.com/LizardByte/sunshine/v$version/"
+
+if [[ "$UPDATE_NIX_OLD_VERSION" == "$version" ]]; then
+    echo "Already up to date!"
+    exit 0
+fi
+
+rm -f package-lock.json package.json
+wget "$url/package.json"
+npm i --package-lock-only
+npm_hash=$(prefetch-npm-deps package-lock.json)
+sed -i 's#npmDepsHash = "[^"]*"#npmDepsHash = "'"$npm_hash"'"#' default.nix
+rm -f package.json
+
+popd
+nix-update sunshine --version $version