feat(gomod): private module support (#3495)

Adds support for fetching private modules off github.com

Closes #3202

lib/manager/gomod/artifacts.js

@@ -2,6 +2,7 @@ const { exec } = require('child-process-promise');
 const fs = require('fs-extra');
 const upath = require('upath');
 const os = require('os');
+const hostRules = require('../../util/host-rules');
 
 module.exports = {
   getArtifacts,
@@ -60,12 +61,29 @@ async function getArtifacts(
       cmd += envVars.map(e => `-e ${e} `).join('');
       cmd += '-e CGO_ENABLED=0 ';
       cmd += `-w ${cwd} `;
-      cmd += `renovate/go go`;
+      cmd += `renovate/go `;
+      const credentials = hostRules.find({
+        platform: 'github',
+        host: 'api.github.com',
+      });
+      if (credentials && credentials.token) {
+        logger.debug('Setting github.com credentials');
+        cmd += `bash -c "git config --global url.\\"https://${
+          global.appMode
+            ? `x-access-token:${credentials.token}`
+            : credentials.token
+        }@github.com/\\".insteadOf \\"https://github.com/\\" && go`;
+      } else {
+        cmd += 'go';
+      }
     } else {
       logger.info('Running go via global command');
       cmd = 'go';
     }
     let args = 'get';
+    if (cmd.includes('.insteadOf')) {
+      args += '"';
+    }
     logger.debug({ cmd, args }, 'go get command');
     ({ stdout, stderr } = await exec(`${cmd} ${args}`, {
       cwd,
@@ -131,6 +149,9 @@ async function getArtifacts(
     if (await platform.getFile(vendorModulesFileName)) {
       if (config.gitFs) {
         args = 'mod vendor';
+        if (cmd.includes('.insteadOf')) {
+          args += '"';
+        }
         logger.debug({ cmd, args }, 'go mod vendor command');
         ({ stdout, stderr } = await exec(`${cmd} ${args}`, {
           cwd,

test/manager/gomod/artifacts.spec.js

@@ -1,9 +1,11 @@
 jest.mock('fs-extra');
 jest.mock('child-process-promise');
+jest.mock('../../../lib/util/host-rules');
 
 const fs = require('fs-extra');
 const { exec } = require('child-process-promise');
 const gomod = require('../../../lib/manager/gomod/artifacts');
+const hostRules = require('../../../lib/util/host-rules');
 
 const gomod1 = `module github.com/renovate-tests/gomod1
 
@@ -48,7 +50,24 @@ describe('.getArtifacts()', () => {
       await gomod.getArtifacts('go.mod', [], gomod1, config)
     ).not.toBeNull();
   });
-  it('supports docker mode', async () => {
+  it('supports docker mode without credentials', async () => {
+    platform.getFile.mockReturnValueOnce('Current go.sum');
+    exec.mockReturnValueOnce({
+      stdout: '',
+      stderror: '',
+    });
+    fs.readFile = jest.fn(() => 'New go.sum');
+    expect(
+      await gomod.getArtifacts('go.mod', [], gomod1, {
+        ...config,
+        binarySource: 'docker',
+      })
+    ).not.toBeNull();
+  });
+  it('supports docker mode with credentials', async () => {
+    hostRules.find.mockReturnValue({
+      token: 'some-token',
+    });
     platform.getFile.mockReturnValueOnce('Current go.sum');
     exec.mockReturnValueOnce({
       stdout: '',