Add MacOS to travis CI (#491)

* cleanup bazel install script, bump to 0.16.0, add osx to build/test

* add osx as a different entry in the build matrix

* reorganize build matrix

.travis.yml

@@ -17,7 +17,7 @@ matrix:
         - ./scripts/coverage.sh
         - bash <(curl -s https://codecov.io/bash)
     - os: linux
-      env: V=0.15.0
+      env: V=0.16.0
       before_install:
         # Install Bazel
          - |
@@ -27,22 +27,7 @@ matrix:
             sysctl kernel.unprivileged_userns_clone=1
             OS=linux
           fi
-          if [[ "${V}" == "HEAD" ]]; then
-            # Determine last successful build number. This may change while we are
-            # downloading, so it's important to determine ahead of time, in case
-            # we need to resume the download.
-            CI_BASE="http://ci.bazel.io/view/Bazel%20bootstrap%20and%20maintenance/job/Bazel/PLATFORM_NAME=${OS}-x86_64/"
-            CI_INDEX_URL="${CI_BASE}/lastSuccessfulBuild/"
-            wget -q -O build-index.html "${CI_INDEX_URL}"
-            CI_BUILD=$(grep '<title>' build-index.html | sed -e 's/^.*#\([0-9]*\).*$/\1/')
-            # Determine the artifact name. This is normally, bazel--installer.sh,
-            # but it may be, for example, bazel-0.5rc2-installer.sh before a release.
-            CI_ARTIFACT=$(grep -o 'bazel-[^\"-]*-installer.sh' build-index.html | head -n 1)
-            URL="${CI_BASE}/${CI_BUILD}/artifact/output/ci/${CI_ARTIFACT}"
-            rm build-index.html
-          else
           URL="https://github.com/bazelbuild/bazel/releases/download/${V}/bazel-${V}-installer-${OS}-x86_64.sh"
-          fi
           wget -O install.sh "${URL}"
           chmod +x install.sh
           ./install.sh --user
@@ -79,19 +64,48 @@ matrix:
 
         # Shutdown must be last.
         - bazel shutdown
+    - os: osx
+      env: V=0.16.0
+      before_install:
+        # Install Bazel
+         - |
+          if [[ "${TRAVIS_OS_NAME}" == "osx" ]]; then
+            OS=darwin
+          else
+            sysctl kernel.unprivileged_userns_clone=1
+            OS=linux
+          fi
+          URL="https://github.com/bazelbuild/bazel/releases/download/${V}/bazel-${V}-installer-${OS}-x86_64.sh"
+          wget -O install.sh "${URL}"
+          chmod +x install.sh
+          ./install.sh --user
+          rm -f install.sh
+        # Decrypt service account (only works on prysmaticlabs branches)
+        # TODO(#282): enable remote caching / execution
+        #- if [[ $encrypted_64ca747eb448_iv ]]; then
+        #    openssl aes-256-cbc -K $encrypted_64ca747eb448_key -iv $encrypted_64ca747eb448_iv
+        #    -in service-account.json.enc -out /tmp/service-account.json -d;
+        #    REMOTE_FLAGS=--config=remote;
+        #  fi
 
-      notifications:
-        email: false
+      install: true # Skip install go packages.
 
-      after_success:
-        - wget https://raw.githubusercontent.com/k3rn31p4nic/travis-ci-discord-webhook/master/send.sh
-        - chmod +x send.sh
-        - ./send.sh success $WEBHOOK_URL
-      after_failure:
-        - wget https://raw.githubusercontent.com/k3rn31p4nic/travis-ci-discord-webhook/master/send.sh
-        - chmod +x send.sh
-        - ./send.sh failure $WEBHOOK_URL
+      script:
+        # Ensure everything builds.
+        - |
+          bazel \
+            --bazelrc=.travis-bazelrc \
+            build \
+            //...
+        # Run all tests.
+        - |
+          bazel \
+            --bazelrc=.travis-bazelrc \
+            test \
+            //... $REMOTE_FLAGS
 
+        # Shutdown must be last.
+        - bazel shutdown
     - language: node_js
       os: linux
       env:
@@ -104,3 +118,15 @@ matrix:
       script:
         # Check solidity linter.
         - solium -d contracts/
+
+      notifications:
+        email: false
+
+      after_success:
+        - wget https://raw.githubusercontent.com/k3rn31p4nic/travis-ci-discord-webhook/master/send.sh
+        - chmod +x send.sh
+        - ./send.sh success $WEBHOOK_URL
+      after_failure:
+        - wget https://raw.githubusercontent.com/k3rn31p4nic/travis-ci-discord-webhook/master/send.sh
+        - chmod +x send.sh
+        - ./send.sh failure $WEBHOOK_URL