Add setup-go

.github/main.workflow

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+on: push
+jobs:
+  build:
+    runs-on:
+      pool: ${{ matrix.operating-system }}
+    strategy:
+      matrix:
+        operating-system: [Linux, macOS, Windows]
+    actions:
+    - name: Set Node.js 10.x
+      uses: bryanmacfarlane/node-config@master
+      with:
+        version: 10.x
+
+    - name: npm install
+      # Explicitly uninstall husky so that we avoid issues with git hooks/node versioning.
+      # Should switch to clean checkout instead when supported.
+      run: npm prune --production && npm install && npm uninstall husky
+
+    - name: Lint
+      run: npm run format-check
+
+    - name: npm test
+      run: npm test

.gitignore

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+# runtime dependencies are checked in
+# dev dependencies are *not* checked in
+node_modules/.bin
+node_modules/typescript
+node_modules/@types
+node_modules/prettier
+__tests__/runner/*

.prettierrc.json

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+{
+    "printWidth": 80,
+    "tabWidth": 2,
+    "useTabs": false,
+    "semi": true,
+    "singleQuote": true,
+    "trailingComma": "none",
+    "bracketSpacing": false,
+    "arrowParens": "avoid",
+    "parser": "typescript"
+  }

LICENSE

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+
+The MIT License (MIT)
+
+Copyright (c) 2018 GitHub, Inc. and contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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+# @actions/setup-go
+
+This action sets by Go environment for use in actions by:
+
+- optionally downloading and caching a version of Go
+- TODO: registering problem matchers for error output 
+- TODO: configuring proxy if the runner is configured to use a proxy (coming with private runners)
+
+# License
+
+The scripts and documentation in this project are released under the [MIT License](LICENSE)
+
+# Contributions
+
+Contributions are welcome!  See [Contributor's Guide](docs/contributors.md)

__tests__/installer.test.ts

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+import io = require('@actions/io');
+import fs = require('fs');
+import os = require('os');
+import path = require('path');
+
+const toolDir = path.join(__dirname, 'runner', 'tools');
+const tempDir = path.join(__dirname, 'runner', 'temp');
+
+process.env['RUNNER_TOOLSDIRECTORY'] = toolDir;
+process.env['RUNNER_TEMPDIRECTORY'] = tempDir;
+import * as installer from '../src/installer';
+
+describe('installer tests', () => {
+  beforeAll(() => {});
+  beforeAll(async () => {
+    await io.rmRF(toolDir);
+    await io.rmRF(tempDir);
+  });
+
+  it('TODO - Add tests', async () => {});
+});

action.yml

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+name: 'Setup Node.js for use with actions'
+description: 'Setup a Node.js environment and add it to the PATH, additionally providing proxy support'
+author: 'GitHub'
+inputs: 
+  version:
+    description: 'Version Spec of the version to use.  Examples: 10.x, 10.15.1, >=10.15.0'
+    default: '10.x'
+runs:
+  using: 'node'
+  main: 'lib/setup-node.js'

docs/contributors.md

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+# Contributors
+
+
+# Checkin
+
+- Do checkin source (src)
+- Do checkin build output (lib)
+- Do checkin runtime node_modules
+- Do not checkin 
+
+# Adding a dev dependency
+
+Remember to update .gitignore.  
+
+# Updating toolkit dependency
+
+Until released publically, update tgz packages in toolkit

jest.config.js

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+module.exports = {
+  clearMocks: true,
+  moduleFileExtensions: ['js', 'ts'],
+  testEnvironment: 'node',
+  testMatch: ['**/*.test.ts'],
+  testRunner: 'jest-circus/runner',
+  transform: {
+    '^.+\\.ts$': 'ts-jest'
+  },
+  verbose: true
+}

lib/installer.js

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+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+// Load tempDirectory before it gets wiped by tool-cache
+let tempDirectory = process.env['RUNNER_TEMPDIRECTORY'] || '';
+const core = __importStar(require("@actions/core"));
+const tc = __importStar(require("@actions/tool-cache"));
+const os = __importStar(require("os"));
+const path = __importStar(require("path"));
+const util = __importStar(require("util"));
+let osPlat = os.platform();
+let osArch = os.arch();
+if (!tempDirectory) {
+    let baseLocation;
+    if (process.platform === 'win32') {
+        // On windows use the USERPROFILE env variable
+        baseLocation = process.env['USERPROFILE'] || 'C:\\';
+    }
+    else {
+        if (process.platform === 'darwin') {
+            baseLocation = '/Users';
+        }
+        else {
+            baseLocation = '/home';
+        }
+    }
+    tempDirectory = path.join(baseLocation, 'actions', 'temp');
+}
+function getGo(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        // check cache
+        let toolPath;
+        toolPath = tc.find('go', normalizeVersion(version));
+        if (!toolPath) {
+            // download, extract, cache
+            toolPath = yield acquireGo(version);
+            core.debug("Go tool is cached under " + toolPath);
+        }
+        setGoEnvironmentVariables(toolPath);
+        toolPath = path.join(toolPath, 'bin');
+        //
+        // prepend the tools path. instructs the agent to prepend for future tasks
+        //
+        core.addPath(toolPath);
+    });
+}
+exports.getGo = getGo;
+function acquireGo(version) {
+    return __awaiter(this, void 0, void 0, function* () {
+        //
+        // Download - a tool installer intimately knows how to get the tool (and construct urls)
+        //
+        let fileName = getFileName(version);
+        let downloadUrl = getDownloadUrl(fileName);
+        let downloadPath = null;
+        try {
+            downloadPath = yield tc.downloadTool(downloadUrl);
+        }
+        catch (error) {
+            core.debug(error);
+            throw (`Failed to download version ${version}: ${error}`);
+        }
+        //
+        // Extract
+        //
+        let extPath = tempDirectory;
+        if (!extPath) {
+            throw new Error('Temp directory not set');
+        }
+        if (osPlat == 'win32') {
+            extPath = yield tc.extractZip(downloadPath);
+        }
+        else {
+            extPath = yield tc.extractTar(downloadPath);
+        }
+        //
+        // Install into the local tool cache - node extracts with a root folder that matches the fileName downloaded
+        //
+        const toolRoot = path.join(extPath, "go");
+        version = normalizeVersion(version);
+        return yield tc.cacheDir(toolRoot, 'go', version);
+    });
+}
+function getFileName(version) {
+    const platform = osPlat == "win32" ? "windows" : osPlat;
+    const arch = osArch == "x64" ? "amd64" : "386";
+    const ext = osPlat == "win32" ? "zip" : "tar.gz";
+    const filename = util.format("go%s.%s-%s.%s", version, platform, arch, ext);
+    return filename;
+}
+function getDownloadUrl(filename) {
+    return util.format("https://storage.googleapis.com/golang/%s", filename);
+}
+function setGoEnvironmentVariables(goRoot) {
+    core.exportVariable('GOROOT', goRoot);
+    const goPath = process.env['GOPATH'] || '';
+    const goBin = process.env['GOBIN'] || '';
+    // set GOPATH and GOBIN as user value
+    if (!util.isNullOrUndefined(goPath)) {
+        core.exportVariable("GOPATH", goPath);
+    }
+    if (!util.isNullOrUndefined(goBin)) {
+        core.exportVariable("GOBIN", goBin);
+    }
+}
+// This function is required to convert the version 1.10 to 1.10.0.
+// Because caching utility accept only sementic version,
+// which have patch number as well.
+function normalizeVersion(version) {
+    const versionPart = version.split(".");
+    if (versionPart[1] == null) {
+        //append minor and patch version if not available
+        return version.concat(".0.0");
+    }
+    else if (versionPart[2] == null) {
+        //append patch version if not available
+        return version.concat(".0");
+    }
+    return version;
+}

lib/setup-go.js

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+"use strict";
+var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
+    return new (P || (P = Promise))(function (resolve, reject) {
+        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
+        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
+        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
+        step((generator = generator.apply(thisArg, _arguments || [])).next());
+    });
+};
+var __importStar = (this && this.__importStar) || function (mod) {
+    if (mod && mod.__esModule) return mod;
+    var result = {};
+    if (mod != null) for (var k in mod) if (Object.hasOwnProperty.call(mod, k)) result[k] = mod[k];
+    result["default"] = mod;
+    return result;
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const core = __importStar(require("@actions/core"));
+const installer = __importStar(require("./installer"));
+function run() {
+    return __awaiter(this, void 0, void 0, function* () {
+        try {
+            //
+            // Version is optional.  If supplied, install / use from the tool cache
+            // If not supplied then task is still used to setup proxy, auth, etc...
+            //
+            const version = core.getInput('version');
+            if (version) {
+                yield installer.getGo(version);
+            }
+            // TODO: setup proxy from runner proxy config
+            // TODO: problem matchers registered
+        }
+        catch (error) {
+            core.setFailed(error.message);
+        }
+    });
+}
+run();