Add $GOBIN

- Set $GOBIN to $(go env GOPATH)/bin
- Add $GOBIN to the PATH

Should make the setup of tools like golangci-lint or golint work with a
simple `go get`.

Using $GOBIN instead of $GOPATH/bin because the goal is to have GOPATH
not being directly referenced. Also, in the future, GOBIN will have a
default value too, so we would not need to manually set it, just add it
to the path (see discussion in golang/go#23439).

Closes #14.

__tests__/gobin.test.ts

@@ -0,0 +1,21 @@
+import * as gobin from '../src/gobin';
+
+jest.mock('child_process');
+
+describe('gobin', () => {
+  const childProcess = require('child_process');
+
+  let execSpy: jest.SpyInstance;
+
+  beforeEach(() => {
+    execSpy = jest.spyOn(childProcess, 'exec');
+    execSpy.mockImplementation((_command, callback) => {
+      callback('', {stdout: '/home/user/go', stderr: ''});
+    });
+  });
+
+  it('should return ${GOPATH}/bin', async () => {
+    const gobinPath = await gobin.getGOBIN('...');
+    expect(gobinPath).toBe('/home/user/go/bin');
+  });
+});

__tests__/setup-go.test.ts

@@ -1,13 +1,10 @@
 import * as tc from '@actions/tool-cache';
 import * as core from '@actions/core';
-import fs = require('fs');
 import osm = require('os');
 import path = require('path');
 import {run} from '../src/main';
-import * as httpm from '@actions/http-client';
 import * as im from '../src/installer';
-import * as sys from '../src/system';
-import {ITypedResponse} from '@actions/http-client/interfaces';
+import * as gobin from '../src/gobin';
 
 let goJsonData = require('./data/golang-dl.json');
 
@@ -25,6 +22,7 @@ describe('setup-go', () => {
   let dlSpy: jest.SpyInstance;
   let exSpy: jest.SpyInstance;
   let cacheSpy: jest.SpyInstance;
+  let getGOBINSpy: jest.SpyInstance;
 
   beforeEach(() => {
     // @actions/core
@@ -46,15 +44,18 @@ describe('setup-go', () => {
     cacheSpy = jest.spyOn(tc, 'cacheDir');
     getSpy = jest.spyOn(im, 'getVersions');
 
+    // gobin
+    getGOBINSpy = jest.spyOn(gobin, 'getGOBIN');
+
     // writes
     cnSpy = jest.spyOn(process.stdout, 'write');
     logSpy = jest.spyOn(console, 'log');
     getSpy.mockImplementation(() => <im.IGoVersion[]>goJsonData);
-    cnSpy.mockImplementation(line => {
+    cnSpy.mockImplementation(_line => {
       // uncomment to debug
       // process.stderr.write('write:' + line + '\n');
     });
-    logSpy.mockImplementation(line => {
+    logSpy.mockImplementation(_line => {
       // uncomment to debug
       // process.stderr.write('log:' + line + '\n');
     });
@@ -181,24 +182,32 @@ describe('setup-go', () => {
     expect(logSpy).toHaveBeenCalledWith(`Setup go stable version spec 1.13.0`);
   });
 
-  it('finds a version of go already in the cache', async () => {
+  it('finds a version in the cache and adds it to the path', async () => {
     inputs['go-version'] = '1.13.0';
-
     let toolPath = path.normalize('/cache/go/1.13.0/x64');
     findSpy.mockImplementation(() => toolPath);
     await run();
 
     let expPath = path.join(toolPath, 'bin');
+    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
   });
 
-  it('finds a version in the cache and adds it to the path', async () => {
+  it('finds a version in the cache, sets GOBIN and adds it to the path', async () => {
     inputs['go-version'] = '1.13.0';
-    let toolPath = path.normalize('/cache/go/1.13.0/x64');
-    findSpy.mockImplementation(() => toolPath);
-    await run();
+    let goroot = '/cache/go/1.13.0/x64';
+    let gorootBin = path.join(goroot, 'bin');
+    findSpy.mockImplementation(() => goroot);
 
-    let expPath = path.join(toolPath, 'bin');
-    expect(cnSpy).toHaveBeenCalledWith(`::add-path::${expPath}${osm.EOL}`);
+    let gobinPath = '/home/user/go/bin';
+    getGOBINSpy.mockImplementation(() => gobinPath);
+
+    await run();
+    expect(cnSpy.mock.calls).toEqual([
+      [`::set-env name=GOROOT::${goroot}${osm.EOL}`],
+      [`::add-path::${gorootBin}${osm.EOL}`],
+      [`::set-env name=GOBIN::${gobinPath}${osm.EOL}`],
+      [`::add-path::${gobinPath}${osm.EOL}`]
+    ]);
   });
 
   it('handles unhandled error and reports error', async () => {
@@ -265,7 +274,6 @@ describe('setup-go', () => {
   });
 
   it('reports empty query results', async () => {
-    let errMsg = 'unhandled download message';
     os.platform = 'linux';
     os.arch = 'x64';
 

dist/index.js

@@ -1279,6 +1279,7 @@ const core = __importStar(__webpack_require__(470));
 const tc = __importStar(__webpack_require__(533));
 const installer = __importStar(__webpack_require__(749));
 const path = __importStar(__webpack_require__(622));
+const gobin = __importStar(__webpack_require__(517));
 function run() {
     return __awaiter(this, void 0, void 0, function* () {
         try {
@@ -1302,6 +1303,9 @@ function run() {
                     core.exportVariable('GOROOT', installDir);
                     core.addPath(path.join(installDir, 'bin'));
                     console.log('Added go to the path');
+                    const gobinDir = yield gobin.getGOBIN(installDir);
+                    core.exportVariable('GOBIN', gobinDir);
+                    core.addPath(gobinDir);
                 }
                 else {
                     throw new Error(`Could not find a version that satisfied version spec: ${versionSpec}`);
@@ -3245,6 +3249,44 @@ function getState(name) {
 exports.getState = getState;
 //# sourceMappingURL=core.js.map
 
+/***/ }),
+
+/***/ 517:
+/***/ (function(__unusedmodule, exports, __webpack_require__) {
+
+"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 childProcess = __importStar(__webpack_require__(129));
+const path = __importStar(__webpack_require__(622));
+const util_1 = __webpack_require__(669);
+const exec = util_1.promisify(childProcess.exec);
+function getGOBIN(installDir) {
+    return __awaiter(this, void 0, void 0, function* () {
+        const goExecutable = path.join(installDir, 'bin', 'go');
+        const result = yield exec(`${goExecutable} env GOPATH`);
+        const gopath = result.stdout;
+        return path.join(gopath, 'bin');
+    });
+}
+exports.getGOBIN = getGOBIN;
+
+
 /***/ }),
 
 /***/ 533:

src/gobin.ts

@@ -0,0 +1,13 @@
+import * as childProcess from 'child_process';
+import * as path from 'path';
+import {promisify} from 'util';
+
+const exec = promisify(childProcess.exec);
+
+export async function getGOBIN(installDir: string): Promise<string> {
+  const goExecutable = path.join(installDir, 'bin', 'go');
+
+  const result = await exec(`${goExecutable} env GOPATH`);
+  const gopath = result.stdout;
+  return path.join(gopath, 'bin');
+}

src/main.ts

@@ -2,6 +2,7 @@ import * as core from '@actions/core';
 import * as tc from '@actions/tool-cache';
 import * as installer from './installer';
 import * as path from 'path';
+import * as gobin from './gobin';
 
 export async function run() {
   try {
@@ -34,6 +35,10 @@ export async function run() {
         core.exportVariable('GOROOT', installDir);
         core.addPath(path.join(installDir, 'bin'));
         console.log('Added go to the path');
+
+        const gobinDir = await gobin.getGOBIN(installDir);
+        core.exportVariable('GOBIN', gobinDir);
+        core.addPath(gobinDir);
       } else {
         throw new Error(
           `Could not find a version that satisfied version spec: ${versionSpec}`