fix(schematics): ng-add should pass if sourceRoot is relative to workspace root

src/schematics/ng-add.jasmine.ts

@@ -467,6 +467,20 @@ describe('ng-add', () => {
       expect(result.read('.firebaserc').toString()).toEqual(overwriteFirebaserc);
       expect(result.read('angular.json').toString()).toEqual(overwriteAngularJson);
     });
+
+    it('runs if source root is relative to workspace root', async () => {
+      const angularJson = generateAngularJson();
+      const project: {root: string, sourceRoot?: string} = angularJson.projects[PROJECT_NAME];
+      project.sourceRoot = `${project.root}/src`;
+      tree.overwrite('angular.json', JSON.stringify(angularJson));
+      const promise = setupProject(tree, {} as any, [FEATURES.Hosting], {
+        firebaseProject: { projectId: FIREBASE_PROJECT } as any,
+        projectType: PROJECT_TYPE.Static,
+        project: undefined,
+        prerender: false,
+      });
+      await expectAsync(promise).toBeResolved();
+    });
 
     it('overrides existing files', async () => {
       const tempTree = await setupProject(tree, {} as any, [FEATURES.Hosting], {

src/schematics/setup/index.ts

@@ -33,7 +33,7 @@ export const setupProject =
 
     const { project, projectName } = getProject(config, tree);
 
-    const sourcePath = [project.root, project.sourceRoot].filter(it => !!it).join('/');
+    const sourcePath = project.sourceRoot ?? project.root;
 
     addIgnoreFiles(tree);