zram-generator: add updateScript

pkgs/tools/system/zram-generator/Cargo.lock

@@ -28,9 +28,9 @@ checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
 name = "cc"
-version = "1.0.78"
+version = "1.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a20104e2335ce8a659d6dd92a51a767a0c062599c73b343fd152cb401e828c3d"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
 
 [[package]]
 name = "cfg-if"
@@ -182,9 +182,9 @@ checksum = "5b40af805b3121feab8a3c29f04d8ad262fa8e0561883e7653e024ae4479e6de"
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.49"
+version = "1.0.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "57a8eca9f9c4ffde41714334dee777596264c7825420f521abc92b5b5deb63a5"
+checksum = "6ef7d57beacfaf2d8aee5937dab7b7f28de3cb8b1828479bb5de2a7106f2bae2"
 dependencies = [
  "unicode-ident",
 ]

pkgs/tools/system/zram-generator/default.nix

@@ -51,8 +51,11 @@ stdenv.mkDerivation rec {
     "SYSTEMD_SYSTEM_GENERATOR_DIR=$(out)/lib/systemd/system-generators"
   ];
 
-  passthru.tests = {
-    inherit (nixosTests) zram-generator;
+  passthru = {
+    tests = {
+      inherit (nixosTests) zram-generator;
+    };
+    updateScript = ./update.sh;
   };
 
   meta = with lib; {

pkgs/tools/system/zram-generator/update.sh

@@ -0,0 +1,15 @@
+#! /usr/bin/env nix-shell
+#! nix-shell -i bash -p coreutils curl jq common-updater-scripts cargo
+# shellcheck shell=bash
+
+set -euo pipefail
+
+version=$(curl -s https://api.github.com/repos/systemd/zram-generator/releases/latest | jq -r .tag_name)
+update-source-version zram-generator "${version#v}"
+
+tmp=$(mktemp -d)
+trap 'rm -rf -- "${tmp}"' EXIT
+
+git clone --depth 1 --branch "${version}" https://github.com/systemd/zram-generator.git "${tmp}/zram-generator"
+cargo generate-lockfile --manifest-path "${tmp}/zram-generator/Cargo.toml"
+cp "${tmp}/zram-generator/Cargo.lock" "$(dirname "$0")/Cargo.lock"