fix(@angular/cli): eject now remove all hardcoded paths

In favor of process.cwd(). Also added a new eject e2e test that verifies
the webpack.config.js does NOT have the project path in it at any place.

Fixed #9335.

Author: hansl

Diff for: packages/@angular/cli/tasks/eject.ts

@@ -225,6 +225,7 @@ class JsonWebpackSerializer {
           break;
         case CircularDependencyPlugin:
           this.variableImports['circular-dependency-plugin'] = 'CircularDependencyPlugin';
+          args.cwd = this._escape('projectRoot');
           break;
         case AotPlugin:
           args = this._aotPluginSerialize(plugin);
@@ -264,11 +265,13 @@ class JsonWebpackSerializer {
             // CopyWebpackPlugin doesn't have a constructor nor save args.
             this.variableImports['copy-webpack-plugin'] = 'CopyWebpackPlugin';
             const patternOptions = plugin['copyWebpackPluginPatterns'].map((pattern: any) => {
-              if (!pattern.context) {
-                return pattern;
+              if (pattern.context) {
+                pattern.context = path.relative(process.cwd(), pattern.context);
               }
-              const context = path.relative(process.cwd(), pattern.context);
-              return { ...pattern, context };
+              if (pattern.from && pattern.from.glob) {
+                pattern.from.glob = path.relative(process.cwd(), pattern.from.glob);
+              }
+              return pattern;
             });
             const patternsSerialized = serializer(patternOptions);
             const optionsSerialized = serializer(plugin['copyWebpackPluginOptions']) || 'undefined';
@@ -315,7 +318,7 @@ class JsonWebpackSerializer {
       if (loader.match(/\/node_modules\/extract-text-webpack-plugin\//)) {
         return 'extract-text-webpack-plugin';
       } else if (loader.match(/@ngtools\/webpack\/src\/index.ts/)) {
-        // return '@ngtools/webpack';
+        return '@ngtools/webpack';
       }
     } else {
       if (loader.loader) {
@@ -327,7 +330,17 @@ class JsonWebpackSerializer {
         Object.keys(args.variableImports)
           .forEach(key => this.variableImports[key] = args.variableImports[key]);
         Object.keys(args.variables)
-          .forEach(key => this.variables[key] = JSON.stringify(args.variables[key]));
+          .forEach(key => {
+            const value = args.variables[key];
+            if (value === process.cwd()) {
+              this.variables[key] = 'process.cwd()';
+            } else if (typeof value == 'string' && value.startsWith(process.cwd())) {
+              this.variables[key] = 'process.cwd() + '
+                                  + JSON.stringify(value.substr(process.cwd().length));
+            } else {
+              this.variables[key] = JSON.stringify(value);
+            }
+          });
 
         this.variables['postcssPlugins'] = loader.options.plugins;
         loader.options.plugins = this._escape('postcssPlugins');

Diff for: tests/e2e/tests/commands/eject/eject.ts

@@ -1,4 +1,5 @@
 import * as path from 'path';
+import { expectFileToMatch, readFile } from '../../../utils/fs';
 
 import {ng, silentNpm, exec} from '../../../utils/process';
 import {expectToFail} from '../../../utils/utils';
@@ -12,6 +13,10 @@ export default function() {
     .then(() => expectToFail(() => ng('e2e')))
     .then(() => expectToFail(() => ng('serve')))
     .then(() => expectToFail(() => expectGitToBeClean()))
+
+    // Check that no path appears anymore.
+    .then(() => expectToFail(() => expectFileToMatch('webpack.config.js', process.cwd())))
+
     .then(() => silentNpm('install'))
     .then(() => exec(path.join('node_modules', '.bin', 'webpack')));
 }