1 files changed, 92 insertions, 0 deletions
diff --git a/pkgs/development/web/deno/update/librusty_v8.ts b/pkgs/development/web/deno/update/librusty_v8.ts
new file mode 100644
index 0000000000000..dee3277c58124
--- /dev/null
+++ b/pkgs/development/web/deno/update/librusty_v8.ts
@@ -0,0 +1,92 @@
+import {
+  genValueRegExp,
+  getExistingVersion,
+  logger,
+  run,
+  versionRegExp,
+  write,
+} from "./common.ts";
+
+const log = logger("librusty_v8");
+
+export interface Architecture {
+  nix: string;
+  rust: string;
+}
+interface PrefetchResult {
+  arch: Architecture;
+  sha256: string;
+}
+
+const getLibrustyV8Version = async (
+  owner: string,
+  repo: string,
+  version: string,
+) =>
+  fetch(`https://github.com/${owner}/${repo}/raw/${version}/core/Cargo.toml`)
+    .then((res) => res.text())
+    .then((txt) =>
+      txt.match(genValueRegExp("rusty_v8", versionRegExp))?.shift()
+    );
+
+const fetchArchShaTasks = (version: string, arches: Architecture[]) =>
+  arches.map(
+    async (arch: Architecture): Promise<PrefetchResult> => {
+      log("Fetching:", arch.nix);
+      const sha256 = await run("nix-prefetch", [
+        `
+{ fetchurl }:
+fetchurl {
+  url = "https://github.com/denoland/rusty_v8/releases/download/v${version}/librusty_v8_release_${arch.rust}.a";
+}
+`,
+      ]);
+      log("Done:    ", arch.nix);
+      return { arch, sha256 };
+    },
+  );
+
+const templateDeps = (version: string, deps: PrefetchResult[]) =>
+  `# auto-generated file -- DO NOT EDIT!
+{ rust, stdenv, fetchurl }:
+
+let
+  arch = rust.toRustTarget stdenv.hostPlatform;
+  fetch_librusty_v8 = args: fetchurl {
+    name = "librusty_v8-\${args.version}";
+    url = "https://github.com/denoland/rusty_v8/releases/download/v\${args.version}/librusty_v8_release_\${arch}.a";
+    sha256 = args.shas.\${stdenv.hostPlatform.system};
+    meta = { inherit (args) version; };
+  };
+in
+fetch_librusty_v8 {
+  version = "${version}";
+  shas = {
+${deps.map(({ arch, sha256 }) => `    ${arch.nix} = "${sha256}";`).join("\n")}
+  };
+}
+`;
+
+export async function updateLibrustyV8(
+  filePath: string,
+  owner: string,
+  repo: string,
+  denoVersion: string,
+  arches: Architecture[],
+) {
+  log("Starting librusty_v8 update");
+  // 0.0.0
+  const version = await getLibrustyV8Version(owner, repo, denoVersion);
+  if (typeof version !== "string") {
+    throw "no librusty_v8 version";
+  }
+  log("librusty_v8 version:", version);
+  const existingVersion = await getExistingVersion(filePath);
+  if (version === existingVersion) {
+    log("Version already matches latest, skipping...");
+    return;
+  }
+  const archShaResults = await Promise.all(fetchArchShaTasks(version, arches));
+  await write(filePath, templateDeps(version, archShaResults));
+  log("Finished deps update");
+}