Automate deployment (#546)

Introduce configuration to allow build servers provided by the Travis CI
service to execute the test generation tool and commit the resultant
files to the canonical upstream repository.

Enabling this workflow required additional administrative work:

1. Create an account with TravisCI
2. Install the `travis` command-line utility
3. Create a "deploy key" and an encrypted version using the command
   `./make.py github_deploy_key_enc`
4. Register the deploy key with the project's GitHub account
5. Check the encrypted deploy key to the repository
6. Configure the TravisCI service to automatically build this project

.gitignore

@@ -3,3 +3,5 @@
 *~
 *.pyc
 console/TestCases
+github-deploy-key
+github-deploy-key.pub

.travis.yml

+language: python
+install: pip install pyyaml
+script: ./make.py
+after_success: |
+  if [ $TRAVIS_EVENT_TYPE != "push" -o $TRAVIS_BRANCH != "master" ]; then
+    echo This job is not running against a commit that has been merged to master.
+    echo Skipping deployment.
+    exit 0
+  fi
+  openssl aes-256-cbc \
+    -K $encrypted_7b3e5998334d_key \
+    -iv $encrypted_7b3e5998334d_iv \
+    -in github-deploy-key.enc \
+    -out github-deploy-key \
+    -d
+  chmod 600 github-deploy-key
+  eval "$(ssh-agent -s)"
+  ssh-add github-deploy-key
+  rm github-deploy-key
+  git config --global user.email "test262@ecma-international.org"
+  git config --global user.name "Test262 Automation Script"
+  # The repository on TravisCI is a shallow clone, so the `master` branch must
+  # be retrieved explicitly, and a local branch created from the `FETCH_HEAD`
+  # git reference
+  git fetch origin master
+  git branch master FETCH_HEAD
+  ./make.py deploy

CONTRIBUTING.md

@@ -282,3 +282,5 @@ To remove all generated files:
 The executable located at `tools/generation/generator.py` offers additional control over the generation procedure.
 
     ./tools/generation/generator.py --help
+
+Tests expressed with this convention are built automatically following the source files' acceptance into the project. Patches should **not** include assets built from these sources.

make.py

@@ -6,6 +6,8 @@ import os, shutil, subprocess, sys
 
 OUT_DIR = os.environ.get('OUT_DIR') or 'test'
 SRC_DIR = os.environ.get('SRC_DIR') or 'src'
+UPSTREAM = os.environ.get('UPSTREAM') or 'git@github.com:tc39/test262.git'
+MAINTAINER = os.environ.get('MAINTAINER') or 'test262@ecma-international.org'
 
 def shell(*args):
     sp = subprocess.Popen(list(args), stdout=subprocess.PIPE)
@@ -46,6 +48,32 @@ def build():
 def clean():
     shell(sys.executable, 'tools/generation/generator.py', 'clean', OUT_DIR)
 
+@target('clean', 'build')
+def deploy():
+    shell('git', 'add', '--all', OUT_DIR)
+    shell('git', 'commit', '--message', '"Re-build from source"')
+    shell('git', 'push', UPSTREAM, 'master')
+    shell('git', 'checkout', '-')
+
+# Generate a deploy key for use in a continuous integration system, allowing
+# for automated deployment in response to merge events.
+@target()
+def github_deploy_key():
+    shell('ssh-keygen',
+          '-t', 'rsa',
+          '-b', '4096',
+          '-C', MAINTAINER,
+          '-f', 'github-deploy-key')
+
+# Encrypt the deploy key so that it may be included in the repository (to be
+# decrypted by the continuous integration server during automated deployment)
+# This requires the "travis" Ruby gem
+# Source: https://docs.travis-ci.com/user/encrypting-files/
+@target('github_deploy_key')
+def github_deploy_key_enc():
+    shell('travis', 'login')
+    shell('travis', 'encrypt-file', 'github-deploy-key')
+
 if len(sys.argv) == 1:
     targets['build']()