fix(deploy): clean up gh-pages obsolete files (#3081)

Prevents the gh-pages branch from growing indefinitely by cleaning up before copying new files.

Fixes #3081

packages/angular-cli/commands/github-pages-deploy.ts

@@ -147,6 +147,7 @@ const githubPagesDeployCommand = Command.extend({
       .then(saveStartingBranchName)
       .then(createGitHubRepoIfNeeded)
       .then(checkoutGhPages)
+      .then(cleanGhPagesBranch)
       .then(copyFiles)
       .then(createNotFoundPage)
       .then(addAndCommit)
@@ -205,6 +206,20 @@ const githubPagesDeployCommand = Command.extend({
         .then(() => execPromise(`git commit -m \"initial ${ghPagesBranch} commit\"`));
     }
 
+    function cleanGhPagesBranch() {
+      return execPromise('git ls-files')
+        .then(function(stdout) {
+          let files = '';
+          stdout.split(/\n/).forEach(function(f) {
+            // skip .gitignore & 404.html
+            if (( f != '') && (f != '.gitignore') && (f != '404.html')) {
+              files = files.concat(`"${f}" `);
+            }
+          });
+          return execPromise(`git rm -r ${files}`);
+        });
+    }
+
     function copyFiles() {
       return fsReadDir(outDir)
         .then((files: string[]) => Promise.all(files.map((file) => {

tests/acceptance/github-pages-deploy.spec.js

@@ -66,6 +66,8 @@ describe('Acceptance: ng github-pages:deploy', function() {
       .addExecSuccess('git rev-parse --abbrev-ref HEAD', initialBranch)
       .addExecSuccess('git remote -v', remote)
       .addExecSuccess(`git checkout ${ghPagesBranch}`)
+      .addExecSuccess('git ls-files')
+      .addExecSuccess('git rm -r ')
       .addExecSuccess('git add .')
       .addExecSuccess(`git commit -m "${message}"`)
       .addExecSuccess(`git checkout ${initialBranch}`)
@@ -83,6 +85,8 @@ describe('Acceptance: ng github-pages:deploy', function() {
       .addExecSuccess('git rev-parse --abbrev-ref HEAD', initialBranch)
       .addExecSuccess('git remote -v', remote)
       .addExecSuccess(`git checkout ${ghPagesBranch}`)
+      .addExecSuccess('git ls-files')
+      .addExecSuccess('git rm -r ')
       .addExecSuccess('git add .')
       .addExecSuccess(`git commit -m "${message}"`)
       .addExecSuccess(`git checkout ${initialBranch}`)
@@ -102,6 +106,8 @@ describe('Acceptance: ng github-pages:deploy', function() {
       .addExecSuccess('git add .gitignore')
       .addExecSuccess('git clean -f -d')
       .addExecSuccess(`git commit -m \"initial ${ghPagesBranch} commit\"`)
+      .addExecSuccess('git ls-files')
+      .addExecSuccess('git rm -r ')
       .addExecSuccess('git add .')
       .addExecSuccess(`git commit -m "${message}"`)
       .addExecSuccess(`git checkout ${initialBranch}`)
@@ -122,6 +128,8 @@ describe('Acceptance: ng github-pages:deploy', function() {
       .addExecSuccess(`git remote add origin [email protected]:${username}/${project}.git`)
       .addExecSuccess(`git push -u origin ${initialBranch}`)
       .addExecSuccess(`git checkout ${ghPagesBranch}`)
+      .addExecSuccess('git ls-files')
+      .addExecSuccess('git rm -r ')
       .addExecSuccess('git add .')
       .addExecSuccess(`git commit -m "${message}"`)
       .addExecSuccess(`git checkout ${initialBranch}`)
@@ -220,6 +228,8 @@ describe('Acceptance: ng github-pages:deploy', function() {
       .addExecSuccess('git rev-parse --abbrev-ref HEAD', initialBranch)
       .addExecSuccess('git remote -v', remote)
       .addExecSuccess(`git checkout ${ghPagesBranch}`)
+      .addExecSuccess('git ls-files')
+      .addExecSuccess('git rm -r ')
       .addExecSuccess('git add .')
       .addExecSuccess(`git commit -m "${message}"`)
       .addExecError(`git checkout ${initialBranch}`, 'error: cannot stat \'src/client\': Permission denied');