bugfix: Don't attempt to use Windows fallbacks on non-Windows OSes (#718)

__tests__/nightly-installer.test.ts

@@ -39,6 +39,7 @@ describe('setup-node', () => {
   let whichSpy: jest.SpyInstance;
   let existsSpy: jest.SpyInstance;
   let mkdirpSpy: jest.SpyInstance;
+  let cpSpy: jest.SpyInstance;
   let execSpy: jest.SpyInstance;
   let authSpy: jest.SpyInstance;
   let parseNodeVersionSpy: jest.SpyInstance;
@@ -51,6 +52,7 @@ describe('setup-node', () => {
     console.log('::stop-commands::stoptoken'); // Disable executing of runner commands when running tests in actions
     process.env['GITHUB_PATH'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
     process.env['GITHUB_OUTPUT'] = ''; // Stub out ENV file functionality so we can verify it writes to standard out
+    process.env['RUNNER_TEMP'] = '/runner_temp';
     inputs = {};
     inSpy = jest.spyOn(core, 'getInput');
     inSpy.mockImplementation(name => inputs[name]);
@@ -78,6 +80,7 @@ describe('setup-node', () => {
     whichSpy = jest.spyOn(io, 'which');
     existsSpy = jest.spyOn(fs, 'existsSync');
     mkdirpSpy = jest.spyOn(io, 'mkdirP');
+    cpSpy = jest.spyOn(io, 'cp');
 
     // @actions/tool-cache
     isCacheActionAvailable = jest.spyOn(cache, 'isFeatureAvailable');
@@ -273,6 +276,92 @@ describe('setup-node', () => {
     expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
   });
 
+  it('windows: falls back to exe version if not in manifest and not in node dist', async () => {
+    os.platform = 'win32';
+    os.arch = 'x64';
+
+    // a version which is not in the manifest but is in node dist
+    const versionSpec = '13.13.1-nightly20200415947ddec091';
+
+    const workingUrls = [
+      `https://nodejs.org/download/nightly/v${versionSpec}/win-x64/node.exe`,
+      `https://nodejs.org/download/nightly/v${versionSpec}/win-x64/node.lib`
+    ];
+
+    inputs['node-version'] = versionSpec;
+    inputs['always-auth'] = false;
+    inputs['token'] = 'faketoken';
+
+    // ... but not in the local cache
+    findSpy.mockImplementation(() => '');
+    findAllVersionsSpy.mockImplementation(() => []);
+
+    dlSpy.mockImplementation(async url => {
+      if (workingUrls.includes(url)) {
+        return '/some/temp/path';
+      }
+
+      throw new tc.HTTPError(404);
+    });
+    const toolPath = path.normalize(
+      '/cache/node/13.13.1-nightly20200415947ddec091/x64'
+    );
+    cacheSpy.mockImplementation(async () => toolPath);
+    mkdirpSpy.mockImplementation(async () => {});
+    cpSpy.mockImplementation(async () => {});
+
+    await main.run();
+
+    workingUrls.forEach(url => {
+      expect(dlSpy).toHaveBeenCalledWith(url);
+    });
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${toolPath}${osm.EOL}`);
+  });
+
+  it('linux: does not fall back to exe version if not in manifest and not in node dist', async () => {
+    os.platform = 'linux';
+    os.arch = 'x64';
+
+    // a version which is not in the manifest but is in node dist
+    const versionSpec = '13.13.1-nightly20200415947ddec091';
+
+    const workingUrls = [
+      `https://nodejs.org/download/nightly/v${versionSpec}/win-x64/node.exe`,
+      `https://nodejs.org/download/nightly/v${versionSpec}/win-x64/node.lib`
+    ];
+
+    inputs['node-version'] = versionSpec;
+    inputs['always-auth'] = false;
+    inputs['token'] = 'faketoken';
+
+    // ... but not in the local cache
+    findSpy.mockImplementation(() => '');
+    findAllVersionsSpy.mockImplementation(() => []);
+
+    dlSpy.mockImplementation(async url => {
+      if (workingUrls.includes(url)) {
+        return '/some/temp/path';
+      }
+
+      throw new tc.HTTPError(404);
+    });
+    const toolPath = path.normalize(
+      '/cache/node/13.13.1-nightly20200415947ddec091/x64'
+    );
+    cacheSpy.mockImplementation(async () => toolPath);
+    mkdirpSpy.mockImplementation(async () => {});
+    cpSpy.mockImplementation(async () => {});
+
+    await main.run();
+
+    workingUrls.forEach(url => {
+      expect(dlSpy).not.toHaveBeenCalledWith(url);
+    });
+    expect(cnSpy).toHaveBeenCalledWith(
+      `::error::Unexpected HTTP response: 404${osm.EOL}`
+    );
+  });
+
   it('does not find a version that does not exist', async () => {
     os.platform = 'linux';
     os.arch = 'x64';

dist/setup/index.js

@@ -73441,8 +73441,10 @@ class BaseDistribution {
                 downloadPath = yield tc.downloadTool(info.downloadUrl);
             }
             catch (err) {
-                if (err instanceof tc.HTTPError && err.httpStatusCode == 404) {
-                    return yield this.acquireNodeFromFallbackLocation(info.resolvedVersion, info.arch);
+                if (err instanceof tc.HTTPError &&
+                    err.httpStatusCode == 404 &&
+                    this.osPlat == 'win32') {
+                    return yield this.acquireWindowsNodeFromFallbackLocation(info.resolvedVersion, info.arch);
                 }
                 throw err;
             }
@@ -73458,7 +73460,7 @@ class BaseDistribution {
         const valid = (_a = semver_1.default.valid(c)) !== null && _a !== void 0 ? _a : versionSpec;
         return { range: valid, options };
     }
-    acquireNodeFromFallbackLocation(version, arch = os_1.default.arch()) {
+    acquireWindowsNodeFromFallbackLocation(version, arch = os_1.default.arch()) {
         return __awaiter(this, void 0, void 0, function* () {
             const initialUrl = this.getDistributionUrl();
             const osArch = this.translateArchToDistUrl(arch);

src/distributions/base-distribution.ts

@@ -127,8 +127,12 @@ export default abstract class BaseDistribution {
     try {
       downloadPath = await tc.downloadTool(info.downloadUrl);
     } catch (err) {
-      if (err instanceof tc.HTTPError && err.httpStatusCode == 404) {
-        return await this.acquireNodeFromFallbackLocation(
+      if (
+        err instanceof tc.HTTPError &&
+        err.httpStatusCode == 404 &&
+        this.osPlat == 'win32'
+      ) {
+        return await this.acquireWindowsNodeFromFallbackLocation(
           info.resolvedVersion,
           info.arch
         );
@@ -151,7 +155,7 @@ export default abstract class BaseDistribution {
     return {range: valid, options};
   }
 
-  protected async acquireNodeFromFallbackLocation(
+  protected async acquireWindowsNodeFromFallbackLocation(
     version: string,
     arch: string = os.arch()
   ): Promise<string> {