alist: add update.nix (#358335)

pkgs/by-name/al/alist/package.nix

@@ -7,6 +7,7 @@
   stdenv,
   installShellFiles,
   versionCheckHook,
+  callPackage,
 }:
 buildGoModule rec {
   pname = "alist";
@@ -88,6 +89,10 @@ buildGoModule rec {
     versionCheckHook
   ];
 
+  passthru = {
+    updateScript = lib.getExe (callPackage ./update.nix { });
+  };
+
   meta = {
     description = "File list/WebDAV program that supports multiple storages";
     homepage = "https://github.com/alist-org/alist";

pkgs/by-name/al/alist/update.nix

@@ -0,0 +1,43 @@
+{
+  writeShellApplication,
+  nix,
+  nix-update,
+  curl,
+  jq,
+  common-updater-scripts,
+}:
+
+writeShellApplication {
+  name = "update-alist";
+  runtimeInputs = [
+    curl
+    jq
+    nix
+    common-updater-scripts
+    nix-update
+  ];
+
+  text = ''
+    # get old info
+    oldVersion=$(nix-instantiate --eval --strict -A "alist.version" | jq -e -r)
+
+    get_latest_release() {
+        local repo=$1
+        curl --fail ''${GITHUB_TOKEN:+ -H "Authorization: bearer $GITHUB_TOKEN"} \
+             -s "https://api.github.com/repos/AlistGo/$repo/releases/latest" | jq -r ".tag_name"
+    }
+
+    version=$(get_latest_release "alist")
+    version="''${version#v}"
+    webVersion=$(get_latest_release "alist-web")
+
+    if [[ "$oldVersion" == "$version" ]]; then
+        echo "Already up to date!"
+        exit 0
+    fi
+
+    update-source-version alist "$webVersion" --source-key=web --version-key=webVersion
+
+    nix-update alist --version="$version"
+  '';
+}