Allow Travis to continue build if decryption fails. (#187)

Decryption of the service key can fail if Travis is building from a fork
instead of a branch.

.travis.yml

@@ -15,12 +15,16 @@
 language: java
 jdk:
   - oraclejdk8
-env:
-  - GOOGLE_APPLICATION_CREDENTIALS=$TRAVIS_BUILD_DIR/service-account.json GCLOUD_PROJECT=cloud-samples-tests
 before_install:
   - openssl aes-256-cbc -K $encrypted_37a4f399de75_key -iv $encrypted_37a4f399de75_iv -in service-account.json.enc -out service-account.json -d
-
-script: mvn --batch-mode clean verify -DskipTests=false | egrep -v "(^\[INFO\] Download|^\[INFO\].*skipping)"
+        && export GOOGLE_APPLICATION_CREDENTIALS=$TRAVIS_BUILD_DIR/service-account.json GCLOUD_PROJECT=cloud-samples-tests
+        || true
+# Skip the install step, since Maven will download the dependencies we need
+# when the test build runs.
+# http://stackoverflow.com/q/31945809/101923
+# https://docs.travis-ci.com/user/customizing-the-build/#Skipping-the-Installation-Step
+install: true
+script: ./travis.sh
 after_success:
   - mvn clean cobertura:cobertura coveralls:report
 branches:

travis.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+# Copyright 2016 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -e
+set -x
+# Set pipefail so that `egrep` does not eat the exit code.
+set -o pipefail
+
+SKIP_TESTS=false
+if [ -z "$GOOGLE_APPLICATION_CREDENTIALS"]; then
+  SKIP_TESTS=true
+fi
+mvn --batch-mode clean verify -DskipTests=$SKIP_TESTS | egrep -v "(^\[INFO\] Download|^\[INFO\].*skipping)"
+