Add option to skip Astral mirror downloads (#387)

## Summary
- add `download-from-astral-mirror` input defaulting to `true`
- skip mirror URL rewriting and download directly from GitHub Releases
when disabled
- document the input and add unit coverage

Fixes #384

Refs: pi-session 019f31bc-bd1c-7276-9b4e-9734fa0aa367

## Testing
- npm run build
- npm run check
- npm run test:unit

README.md

@@ -32,6 +32,7 @@ anything `ruff` can (ex, fix).
 | `version`       | The version of Ruff to install. See [Install specific versions](#install-specific-versions)                                                | discovered from `pyproject.toml`, else `latest` |
 | `version-file`  | The file to read the version from. See [Install a version from a specified version file](#install-a-version-from-a-specified-version-file) | None               |
 | `manifest-file` | URL to a custom Ruff manifest in the `astral-sh/versions` format.                                                                          | None               |
+| `download-from-astral-mirror` | Download Ruff from the Astral mirror instead of directly from GitHub Releases.                                                   | `true`             |
 | `args`          | The arguments to pass to the `ruff` command. See [Configuring Ruff]                                                                        | `check`            |
 | `src`           | Source path(s) to run `ruff` on. Supports glob patterns.                                                                                   | [github.workspace] |
 | `checksum`      | The sha256 checksum of the downloaded artifact.                                                                                            | None               |
@@ -224,10 +225,12 @@ are automatically verified by this action. The sha256 hashes can be found on the
 
 ### GitHub authentication token
 
-By default, this action resolves available uv versions from
-[`astral-sh/versions`](https://github.com/astral-sh/versions) and downloads release artifacts from `https://releases.astral.sh`. If this fails this action falls back to downloading from the GitHub releases page of the ruff repository.
+By default, this action resolves available Ruff versions from
+[`astral-sh/versions`](https://github.com/astral-sh/versions) and downloads release artifacts from `https://releases.astral.sh`. If this fails this action falls back to downloading from the GitHub releases page of the Ruff repository.
 
-You can provide a token via `github-token` to authenticate those downloads. By default, the
+Set `download-from-astral-mirror` to `false` to skip the Astral mirror and download directly from GitHub Releases.
+
+You can provide a token via `github-token` to authenticate GitHub Releases downloads. By default, the
 `GITHUB_TOKEN` secret is used, which is automatically provided by GitHub Actions.
 
 If the default

__tests__/download/download-version.test.ts

@@ -357,6 +357,32 @@ describe("download-version", () => {
       expect(mockDownloadTool).toHaveBeenCalledTimes(1);
     });
 
+    it("skips the Astral mirror when downloadFromAstralMirror is false", async () => {
+      mockGetArtifact.mockResolvedValue({
+        archiveFormat: "tar.gz",
+        checksum: "abc123",
+        downloadUrl:
+          "https://github.com/astral-sh/ruff/releases/download/0.15.8/ruff-x86_64-unknown-linux-gnu.tar.gz",
+      });
+
+      await downloadVersion(
+        "unknown-linux-gnu",
+        "x86_64",
+        "0.15.8",
+        undefined,
+        "token",
+        undefined,
+        false,
+      );
+
+      expect(mockDownloadTool).toHaveBeenCalledWith(
+        "https://github.com/astral-sh/ruff/releases/download/0.15.8/ruff-x86_64-unknown-linux-gnu.tar.gz",
+        undefined,
+        "token",
+      );
+      expect(mockDownloadTool).toHaveBeenCalledTimes(1);
+    });
+
     it("uses manifest-file checksum metadata when checksum input is unset", async () => {
       mockGetArtifact.mockResolvedValue({
         archiveFormat: "tar.gz",

action.yml

@@ -23,6 +23,10 @@ inputs:
   manifest-file:
     description: "URL to a custom manifest file in the astral-sh/versions format."
     required: false
+  download-from-astral-mirror:
+    description: "Download Ruff from the Astral mirror instead of directly from GitHub Releases."
+    required: false
+    default: "true"
   github-token:
     description:
       "Used for authenticated downloads of Ruff release artifacts from GitHub."

src/download/download-version.ts

@@ -35,6 +35,7 @@ export async function downloadVersion(
   checksum: string | undefined,
   githubToken: string,
   manifestUrl?: string,
+  downloadFromAstralMirror = true,
 ): Promise<{ version: string; cachedToolDir: string }> {
   const artifact = await getArtifact(version, arch, platform, manifestUrl);
 
@@ -57,6 +58,7 @@ export async function downloadVersion(
     arch,
     version,
     getDownloadToken(artifact.downloadUrl, githubToken),
+    downloadFromAstralMirror,
   );
   await validateChecksum(
     resolvedChecksum,
@@ -83,6 +85,10 @@ export async function downloadVersion(
   return { cachedToolDir, version };
 }
 
+/**
+ * Rewrite a GitHub Releases URL to the Astral mirror.
+ * Returns `undefined` if the URL does not match the expected GitHub prefix.
+ */
 export function rewriteToMirror(url: string): string | undefined {
   if (!url.startsWith(GITHUB_RELEASES_PREFIX)) {
     return undefined;
@@ -97,8 +103,11 @@ async function downloadArtifact(
   arch: Architecture,
   version: string,
   githubToken: string | undefined,
+  downloadFromAstralMirror: boolean,
 ): Promise<string> {
-  const mirrorUrl = rewriteToMirror(downloadUrl);
+  const mirrorUrl = downloadFromAstralMirror
+    ? rewriteToMirror(downloadUrl)
+    : undefined;
   const resolvedDownloadUrl = mirrorUrl ?? downloadUrl;
 
   try {

src/ruff-action.ts

@@ -9,6 +9,7 @@ import {
 import {
   args,
   checkSum,
+  downloadFromAstralMirror,
   githubToken,
   manifestFile,
   src,
@@ -39,7 +40,13 @@ async function run(): Promise<void> {
     if (arch === undefined) {
       throw new Error(`Unsupported architecture: ${process.arch}`);
     }
-    const setupResult = await setupRuff(platform, arch, checkSum, githubToken);
+    const setupResult = await setupRuff(
+      platform,
+      arch,
+      checkSum,
+      githubToken,
+      downloadFromAstralMirror,
+    );
 
     addRuffToPath(setupResult.ruffDir);
     setOutputFormat();
@@ -60,6 +67,7 @@ async function setupRuff(
   arch: Architecture,
   checkSum: string | undefined,
   githubToken: string,
+  downloadFromAstralMirror: boolean,
 ): Promise<{ ruffDir: string; version: string }> {
   const resolvedVersion = await determineVersion();
   const manifestUrl = manifestFile || undefined;
@@ -84,6 +92,7 @@ async function setupRuff(
     checkSum,
     githubToken,
     manifestUrl,
+    downloadFromAstralMirror,
   );
 
   return {

src/utils/inputs.ts

@@ -7,3 +7,14 @@ export const args = core.getInput("args");
 export const src = core.getInput("src");
 export const versionFile = core.getInput("version-file");
 export const manifestFile = core.getInput("manifest-file");
+export const downloadFromAstralMirror = getBooleanInput(
+  "download-from-astral-mirror",
+  true,
+);
+
+function getBooleanInput(name: string, defaultValue: boolean): boolean {
+  if (core.getInput(name) === "") {
+    return defaultValue;
+  }
+  return core.getBooleanInput(name);
+}