Resolve latest version instead of downloading latest release (#178)

README.md

@@ -42,12 +42,6 @@ Set up your GitHub Actions workflow with a specific version of [uv](https://docs
 For an example workflow, see
 [here](https://github.com/charliermarsh/autobot/blob/e42c66659bf97b90ca9ff305a19cc99952d0d43f/.github/workflows/ci.yaml).
 
-> [!TIP]
->
-> Using `latest` requires to download the uv executable on every run, which incurs a cost
-> (especially on self-hosted runners). As a best practice, consider pinning the version to a
-> specific release.
-
 ### Install a specific version
 
 ```yaml

src/download/download-version.ts

@@ -70,10 +70,14 @@ export async function downloadVersion(
   return { version: resolvedVersion, cachedToolDir };
 }
 
-async function resolveVersion(
-  version: string,
+export async function resolveVersion(
+  versionInput: string,
   githubToken: string,
 ): Promise<string> {
+  const version =
+    versionInput === "latest"
+      ? await getLatestVersion(githubToken)
+      : versionInput;
   if (tc.isExplicitVersion(version)) {
     core.debug(`Version ${version} is an explicit version.`);
     return version;
@@ -95,3 +99,17 @@ async function getAvailableVersions(githubToken: string): Promise<string[]> {
   });
   return response.map((release) => release.tag_name);
 }
+
+async function getLatestVersion(githubToken: string) {
+  const octokit = github.getOctokit(githubToken);
+
+  const { data: latestRelease } = await octokit.rest.repos.getLatestRelease({
+    owner: OWNER,
+    repo: REPO,
+  });
+
+  if (!latestRelease) {
+    throw new Error("Could not determine latest release.");
+  }
+  return latestRelease.tag_name;
+}

src/setup-uv.ts

@@ -3,10 +3,10 @@ import * as path from "node:path";
 import {
   downloadVersion,
   tryGetFromToolCache,
+  resolveVersion,
 } from "./download/download-version";
 import { restoreCache } from "./cache/restore-cache";
 
-import { downloadLatest } from "./download/download-latest";
 import {
   type Architecture,
   getArch,
@@ -69,38 +69,28 @@ async function setupUv(
   checkSum: string | undefined,
   githubToken: string,
 ): Promise<{ uvDir: string; version: string }> {
-  let installedPath: string | undefined;
-  let cachedToolDir: string;
-  let version: string;
-  if (versionInput === "latest") {
-    const latestResult = await downloadLatest(
-      platform,
-      arch,
-      checkSum,
-      githubToken,
-    );
-    version = latestResult.version;
-    cachedToolDir = latestResult.cachedToolDir;
-  } else {
-    const toolCacheResult = tryGetFromToolCache(arch, versionInput);
-    version = toolCacheResult.version;
-    installedPath = toolCacheResult.installedPath;
-    if (installedPath) {
-      core.info(`Found uv in tool-cache for ${versionInput}`);
-      return { uvDir: installedPath, version };
-    }
-    const versionResult = await downloadVersion(
-      platform,
-      arch,
-      versionInput,
-      checkSum,
-      githubToken,
-    );
-    cachedToolDir = versionResult.cachedToolDir;
-    version = versionResult.version;
+  const resolvedVersion = await resolveVersion(versionInput, githubToken);
+  const toolCacheResult = tryGetFromToolCache(arch, resolvedVersion);
+  if (toolCacheResult.installedPath) {
+    core.info(`Found uv in tool-cache for ${toolCacheResult.version}`);
+    return {
+      uvDir: toolCacheResult.installedPath,
+      version: toolCacheResult.version,
+    };
   }
 
-  return { uvDir: cachedToolDir, version };
+  const downloadVersionResult = await downloadVersion(
+    platform,
+    arch,
+    resolvedVersion,
+    checkSum,
+    githubToken,
+  );
+
+  return {
+    uvDir: downloadVersionResult.cachedToolDir,
+    version: downloadVersionResult.version,
+  };
 }
 
 function addUvToPath(cachedPath: string): void {