Tolerate transient manifest timeouts (#1016)

Transient timeout fetching manifests have increased significantly
recently, especially with private runners.

```
Fetching manifest data from https://raw.githubusercontent.com/astral-sh/versions/main/v1/uv.ndjson ...
Error: The operation was aborted due to timeout
```

Retry transient manifest network failures up to three times with a
progressive backoff (not exponential), keeping the total wait bounded
while making setup resilient to short network blips.

Co-authored-by: Raymond <arguile-@users.noreply.github.com>

__tests__/download/manifest.test.ts

@@ -1,4 +1,11 @@
-import { beforeEach, describe, expect, it, jest } from "@jest/globals";
+import {
+  afterEach,
+  beforeEach,
+  describe,
+  expect,
+  it,
+  jest,
+} from "@jest/globals";
 
 // biome-ignore lint/suspicious/noExplicitAny: Mock requires flexible typing in tests.
 const mockFetch = jest.fn<any>();
@@ -13,6 +20,7 @@ jest.unstable_mockModule("../../src/utils/fetch", () => ({
 }));
 
 const {
+  MANIFEST_FETCH_ATTEMPTS,
   clearManifestCache,
   fetchManifest,
   getAllVersions,
@@ -73,6 +81,10 @@ describe("manifest", () => {
     mockFetch.mockReset();
   });
 
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
   describe("fetchManifest", () => {
     it("fetches and parses manifest data", async () => {
       mockFetch.mockResolvedValue(
@@ -86,6 +98,34 @@ describe("manifest", () => {
       expect(versions[1]?.version).toBe("0.9.25");
     });
 
+    it("retries network failures", async () => {
+      jest.useFakeTimers();
+      mockFetch
+        .mockRejectedValueOnce(new Error("request timed out"))
+        .mockResolvedValueOnce(
+          createMockResponse(true, 200, "OK", sampleManifestResponse),
+        );
+
+      const result = fetchManifest();
+      await jest.runAllTimersAsync();
+
+      await expect(result).resolves.toHaveLength(2);
+      expect(mockFetch).toHaveBeenCalledTimes(2);
+    });
+
+    it("stops after the configured number of network failures", async () => {
+      jest.useFakeTimers();
+      mockFetch.mockRejectedValue(new Error("request timed out"));
+
+      const result = expect(fetchManifest()).rejects.toThrow(
+        "request timed out",
+      );
+      await jest.runAllTimersAsync();
+
+      await result;
+      expect(mockFetch).toHaveBeenCalledTimes(MANIFEST_FETCH_ATTEMPTS);
+    });
+
     it("throws on a failed fetch", async () => {
       mockFetch.mockResolvedValue(
         createMockResponse(false, 500, "Internal Server Error", ""),

dist/setup/index.cjs

@@ -99724,6 +99724,7 @@ function formatVariants(entries) {
 
 // src/download/manifest.ts
 var cachedManifestData = /* @__PURE__ */ new Map();
+var MANIFEST_FETCH_ATTEMPTS = 3;
 async function fetchManifest(manifestUrl = VERSIONS_MANIFEST_URL) {
   const cachedManifest = cachedManifestData.get(manifestUrl);
   if (cachedManifest?.complete === true) {
@@ -99802,8 +99803,24 @@ async function getArtifact(version3, arch3, platform2, manifestUrl = VERSIONS_MA
   };
 }
 async function fetchManifestResponse(manifestUrl) {
+  let response;
+  for (let attempt = 1; attempt <= MANIFEST_FETCH_ATTEMPTS; attempt++) {
     info2(`Fetching manifest data from ${manifestUrl} ...`);
-  const response = await fetch(manifestUrl, {});
+    try {
+      response = await fetch(manifestUrl, {});
+      break;
+    } catch (error2) {
+      if (attempt >= MANIFEST_FETCH_ATTEMPTS) {
+        throw error2;
+      }
+      const delayMs = 1e3 * 2 ** (attempt - 1);
+      info2(`Manifest fetch failed; retrying in ${delayMs}ms ...`);
+      await new Promise((resolve3) => setTimeout(resolve3, delayMs));
+    }
+  }
+  if (response === void 0) {
+    throw new Error("Manifest fetch attempts exhausted.");
+  }
   if (!response.ok) {
     throw new Error(
       `Failed to fetch manifest data: ${response.status} ${response.statusText}`

dist/update-known-checksums/index.cjs

@@ -52390,6 +52390,7 @@ function info2(msg) {
 
 // src/download/manifest.ts
 var cachedManifestData = /* @__PURE__ */ new Map();
+var MANIFEST_FETCH_ATTEMPTS = 3;
 async function fetchManifest(manifestUrl = VERSIONS_MANIFEST_URL) {
   const cachedManifest = cachedManifestData.get(manifestUrl);
   if (cachedManifest?.complete === true) {
@@ -52430,8 +52431,24 @@ async function getLatestVersion(manifestUrl = VERSIONS_MANIFEST_URL) {
   return latestVersion;
 }
 async function fetchManifestResponse(manifestUrl) {
+  let response;
+  for (let attempt = 1; attempt <= MANIFEST_FETCH_ATTEMPTS; attempt++) {
     info2(`Fetching manifest data from ${manifestUrl} ...`);
-  const response = await fetch(manifestUrl, {});
+    try {
+      response = await fetch(manifestUrl, {});
+      break;
+    } catch (error2) {
+      if (attempt >= MANIFEST_FETCH_ATTEMPTS) {
+        throw error2;
+      }
+      const delayMs = 1e3 * 2 ** (attempt - 1);
+      info2(`Manifest fetch failed; retrying in ${delayMs}ms ...`);
+      await new Promise((resolve) => setTimeout(resolve, delayMs));
+    }
+  }
+  if (response === void 0) {
+    throw new Error("Manifest fetch attempts exhausted.");
+  }
   if (!response.ok) {
     throw new Error(
       `Failed to fetch manifest data: ${response.status} ${response.statusText}`

src/download/manifest.ts

@@ -31,6 +31,7 @@ interface CachedManifest {
 }
 
 const cachedManifestData = new Map<string, CachedManifest>();
+export const MANIFEST_FETCH_ATTEMPTS = 3;
 
 export async function fetchManifest(
   manifestUrl: string = VERSIONS_MANIFEST_URL,
@@ -166,8 +167,26 @@ export function clearManifestCache(manifestUrl?: string): void {
 }
 
 async function fetchManifestResponse(manifestUrl: string) {
+  let response: Awaited<ReturnType<typeof fetch>> | undefined;
+  for (let attempt = 1; attempt <= MANIFEST_FETCH_ATTEMPTS; attempt++) {
     log.info(`Fetching manifest data from ${manifestUrl} ...`);
-  const response = await fetch(manifestUrl, {});
+    try {
+      response = await fetch(manifestUrl, {});
+      break;
+    } catch (error) {
+      if (attempt >= MANIFEST_FETCH_ATTEMPTS) {
+        throw error;
+      }
+      const delayMs = 1_000 * 2 ** (attempt - 1);
+      log.info(`Manifest fetch failed; retrying in ${delayMs}ms ...`);
+      await new Promise((resolve) => setTimeout(resolve, delayMs));
+    }
+  }
+
+  if (response === undefined) {
+    throw new Error("Manifest fetch attempts exhausted.");
+  }
+
   if (!response.ok) {
     throw new Error(
       `Failed to fetch manifest data: ${response.status} ${response.statusText}`,