Fix cache keys for Python version ranges (#937)

## Summary
- URL-encode the Python version component before adding it to the cache
key
- URL-encode the user-provided cache suffix for the same reason
- Add cache key tests for Python ranges, comma-containing suffixes, and
unchanged simple inputs

Fixes #914

Refs: pi-session 019f3164-85e7-7817-bffd-501d89b3a1fd

## Tests
- npm run all

__tests__/cache/restore-cache.test.ts

@@ -0,0 +1,74 @@
+import { beforeEach, describe, expect, it, jest } from "@jest/globals";
+import { createSetupInputs } from "../helpers/setup-inputs";
+
+const mockRestoreCache = jest.fn();
+const mockSaveState = jest.fn();
+const mockSetOutput = jest.fn();
+
+jest.unstable_mockModule("@actions/cache", () => ({
+  restoreCache: mockRestoreCache,
+}));
+
+jest.unstable_mockModule("@actions/core", () => ({
+  saveState: mockSaveState,
+  setOutput: mockSetOutput,
+}));
+
+jest.unstable_mockModule("../../src/hash/hash-files", () => ({
+  hashFiles: jest.fn(async () => "dependencyhash"),
+}));
+
+jest.unstable_mockModule("../../src/utils/logging", () => ({
+  info: jest.fn(),
+  warning: jest.fn(),
+}));
+
+jest.unstable_mockModule("../../src/utils/platforms", () => ({
+  getArch: jest.fn(() => "x86_64"),
+  getOSNameVersion: jest.fn(() => "ubuntu-24.04"),
+  getPlatform: jest.fn(async () => "unknown-linux-gnu"),
+}));
+
+const { restoreCache } = await import("../../src/cache/restore-cache");
+
+function cacheKeyOutput(): string {
+  const call = mockSetOutput.mock.calls.find(([name]) => name === "cache-key");
+  expect(call).toBeDefined();
+  return call?.[1] as string;
+}
+
+beforeEach(() => {
+  jest.clearAllMocks();
+});
+
+describe("restoreCache", () => {
+  it("encodes Python version ranges before adding them to the cache key", async () => {
+    await restoreCache(createSetupInputs(), ">3.10.11,<3.11");
+
+    const cacheKey = cacheKeyOutput();
+
+    expect(cacheKey).not.toContain(",");
+    expect(cacheKey).toContain("-%3E3.10.11%2C%3C3.11-");
+  });
+
+  it("encodes cache suffixes before adding them to the cache key", async () => {
+    const inputs = createSetupInputs({ cacheSuffix: "tests-3.10,3.11" });
+
+    await restoreCache(inputs, "3.11");
+
+    const cacheKey = cacheKeyOutput();
+
+    expect(cacheKey).not.toContain(",");
+    expect(cacheKey).toContain("-tests-3.10%2C3.11");
+  });
+
+  it("keeps cache keys unchanged for exact Python versions and simple suffixes", async () => {
+    const inputs = createSetupInputs({ cacheSuffix: "tests-3.11" });
+
+    await restoreCache(inputs, "3.11");
+
+    expect(cacheKeyOutput()).toBe(
+      "setup-uv-2-x86_64-unknown-linux-gnu-ubuntu-24.04-3.11-pruned-dependencyhash-tests-3.11",
+    );
+  });
+});

__tests__/helpers/setup-inputs.ts

@@ -0,0 +1,36 @@
+import { CacheLocalSource, type SetupInputs } from "../../src/utils/inputs";
+
+export function createSetupInputs(
+  overrides: Partial<SetupInputs> = {},
+): SetupInputs {
+  return {
+    activateEnvironment: false,
+    addProblemMatchers: false,
+    cacheDependencyGlob: "uv.lock",
+    cacheLocalPath: {
+      path: "/tmp/setup-uv-cache",
+      source: CacheLocalSource.Input,
+    },
+    cachePython: false,
+    cacheSuffix: "",
+    checksum: "",
+    downloadFromAstralMirror: false,
+    enableCache: true,
+    githubToken: "",
+    ignoreEmptyWorkdir: false,
+    ignoreNothingToCache: false,
+    noProject: false,
+    pruneCache: true,
+    pythonDir: "/tmp/uv-python-dir",
+    pythonVersion: "",
+    quiet: false,
+    resolutionStrategy: "highest",
+    restoreCache: false,
+    saveCache: true,
+    venvPath: "/workspace/.venv",
+    version: "",
+    versionFile: "",
+    workingDirectory: "/workspace",
+    ...overrides,
+  };
+}

dist/setup/index.cjs

@@ -90621,8 +90621,8 @@ async function computeKeys(inputs, pythonVersion) {
   if (cacheDependencyPathHash === "-") {
     cacheDependencyPathHash = "-no-dependency-glob";
   }
-  const suffix = inputs.cacheSuffix ? `-${inputs.cacheSuffix}` : "";
-  const version3 = pythonVersion ?? "unknown";
+  const suffix = inputs.cacheSuffix ? `-${encodeURIComponent(inputs.cacheSuffix)}` : "";
+  const version3 = encodeURIComponent(pythonVersion ?? "unknown");
   const platform2 = await getPlatform();
   const osNameVersion = getOSNameVersion();
   const pruned = inputs.pruneCache ? "-pruned" : "";

src/cache/restore-cache.ts

@@ -94,8 +94,10 @@ async function computeKeys(
   if (cacheDependencyPathHash === "-") {
     cacheDependencyPathHash = "-no-dependency-glob";
   }
-  const suffix = inputs.cacheSuffix ? `-${inputs.cacheSuffix}` : "";
-  const version = pythonVersion ?? "unknown";
+  const suffix = inputs.cacheSuffix
+    ? `-${encodeURIComponent(inputs.cacheSuffix)}`
+    : "";
+  const version = encodeURIComponent(pythonVersion ?? "unknown");
   const platform = await getPlatform();
   const osNameVersion = getOSNameVersion();
   const pruned = inputs.pruneCache ? "-pruned" : "";