Hello world app + cloudbuild files

Change-Id: I694e703bda05fdad64c5ecd47ebce71a76cefd3a

CONTRIBUTING.md

+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. There are
+just a few small guidelines you need to follow.
+
+## Contributor License Agreement
+
+Contributions to this project must be accompanied by a Contributor License
+Agreement. You (or your employer) retain the copyright to your contribution;
+this simply gives us permission to use and redistribute your contributions as
+part of the project. Head over to <https://cla.developers.google.com/> to see
+your current agreements on file or to sign a new one.
+
+You generally only need to submit a CLA once, so if you've already submitted one
+(even if it was for a different project), you probably don't need to do it
+again.
+
+## Code reviews
+
+All submissions, including submissions by project members, require review. We
+use GitHub pull requests for this purpose. Consult
+[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more
+information on using pull requests.
+
+## Community Guidelines
+
+This project follows
+[Google's Open Source Community
+Guidelines](https://opensource.google.com/conduct/).

Dockerfile

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+# [START dockerfile]
+FROM python:3.7-slim
+RUN pip install flask
+WORKDIR /app
+COPY app.py /app/app.py
+ENTRYPOINT ["python"]
+CMD ["/app/app.py"]
+# [END dockerfile]

LICENSE

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README.md

+# GitOps-style Continuous Delivery For Kubernetes Engine With Cloud Build
+
+This repository contains the code used in the
+[GitOps-style Continuous Delivery with Cloud Build](https://cloud.google.com/kubernetes-engine/docs/tutorials/gitops-cloud-build)
+tutorial.
+
+GitOps is a Continuous Delivery approach [first described by Weaveworks](https://www.weave.works/blog/gitops-operations-by-pull-request) that is
+popular in the Kubernetes community. A key part of GitOps is the idea of
+"environments-as-code": describing your deployments declaratively by files (for
+example, Kubernetes manifests) stored in a Git repository.
+
+In this tutorial, you create a CI/CD pipeline that automatically builds a
+container image from commited code, stores the image in Google Container
+Registry, updates a Kubernetes manifest in a Git repository and triggers a
+deployment to Kubernetes Engine using that manifest.
+
+This tutorial uses two Git repositories: one for the application —the _app_
+repository— and one for storing the deployment manifests —the _env_ repository.
+When a change is pushed to the application repository, tests are run, a
+container image is built and pushed to Container Registry. Once the image is
+pushed, the deployment manifests are updated to use that new image and they are
+pushed to the _candidate_ branch of the _env_ repository. This triggers the actual
+deployment in Kubernetes. Once the deployment is finished, the new manifests
+are copied over to the _production_ branch of the _env_ repository.
+
+In the end, you have a system where:
+* The _candidate_ branch is a history of the deployment attempts.
+* The _production_ branch is a history of the successful deployments.
+* You have a view of successful and failed deployments in Cloud Build.
+* You can rollback to any previous deployment by re-executing the corresponding
+  job in Cloud Build. A rollback also updates the _production_ branch to
+  truthfully reflect the history of deployments.

app.py

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+# [START hello-app]
+from flask import Flask
+app = Flask('hello-cloudbuild')
+
+@app.route('/')
+def hello():
+  return "Hello World!\n"
+
+if __name__ == '__main__':
+  app.run(host = '0.0.0.0', port = 8080)
+# [END hello-app]

cloudbuild-delivery.yaml

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+# [START cloudbuild-delivery]
+steps:
+# This step deploys the new version of our container image
+# in the hello-cloudbuild Kubernetes Engine cluster.
+- name: 'gcr.io/cloud-builders/kubectl'
+  id: Deploy
+  args:
+  - 'apply'
+  - '-f'
+  - 'kubernetes.yaml'
+  env:
+  - 'CLOUDSDK_COMPUTE_ZONE=us-central1-b'
+  - 'CLOUDSDK_CONTAINER_CLUSTER=hello-cloudbuild'
+
+# This step copies the applied manifest to the production branch
+# The COMMIT_SHA variable is automatically
+# replaced by Cloud Build.
+- name: 'gcr.io/cloud-builders/git'
+  id: Copy to production branch
+  entrypoint: /bin/sh
+  args:
+  - '-c'
+  - |
+    set -x && \
+    # Configure Git to create commits with Cloud Build's service account
+    git config user.email $(gcloud auth list --filter=status:ACTIVE --format='value(account)') && \
+    # Switch to the production branch and copy the kubernetes.yaml file from the candidate branch
+    git fetch origin production && git checkout production && \
+    git checkout $COMMIT_SHA kubernetes.yaml && \
+    # Commit the kubernetes.yaml file with a descriptive commit message
+    git commit -m "Manifest from commit $COMMIT_SHA
+    $(git log --format=%B -n 1 $COMMIT_SHA)" && \
+    # Push the changes back to Cloud Source Repository
+    git push origin production
+# [END cloudbuild-delivery]

cloudbuild-trigger-cd.yaml

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+# [START cloudbuild]
+steps:
+# This step runs the unit tests on the app
+- name: 'python:3.7-slim'
+  id: Test
+  entrypoint: /bin/sh
+  args:
+  - -c
+  - 'pip install flask && python test_app.py -v'
+
+# This step builds the container image.
+- name: 'gcr.io/cloud-builders/docker'
+  id: Build
+  args:
+  - 'build'
+  - '-t'
+  - 'gcr.io/$PROJECT_ID/hello-cloudbuild:$SHORT_SHA'
+  - '.'
+
+# This step pushes the image to Container Registry
+# The PROJECT_ID and SHORT_SHA variables are automatically
+# replaced by Cloud Build.
+- name: 'gcr.io/cloud-builders/docker'
+  id: Push
+  args:
+  - 'push'
+  - 'gcr.io/$PROJECT_ID/hello-cloudbuild:$SHORT_SHA'
+# [END cloudbuild]
+
+# [START cloudbuild-trigger-cd]
+# This step clones the hello-cloudbuild-env repository
+- name: 'gcr.io/cloud-builders/gcloud'
+  id: Clone env repository
+  entrypoint: /bin/sh
+  args:
+  - '-c'
+  - |
+    gcloud source repos clone hello-cloudbuild-env && \
+    cd hello-cloudbuild-env && \
+    git checkout candidate && \
+    git config user.email $(gcloud auth list --filter=status:ACTIVE --format='value(account)')
+
+# This step generates the new manifest
+- name: 'gcr.io/cloud-builders/gcloud'
+  id: Generate manifest
+  entrypoint: /bin/sh
+  args:
+  - '-c'
+  - |
+     sed "s/GOOGLE_CLOUD_PROJECT/${PROJECT_ID}/g" kubernetes.yaml.tpl | \
+     sed "s/COMMIT_SHA/${SHORT_SHA}/g" > hello-cloudbuild-env/kubernetes.yaml
+
+# This step pushes the manifest back to hello-cloudbuild-env
+- name: 'gcr.io/cloud-builders/gcloud'
+  id: Push manifest
+  entrypoint: /bin/sh
+  args:
+  - '-c'
+  - |
+    set -x && \
+    cd hello-cloudbuild-env && \
+    git add kubernetes.yaml && \
+    git commit -m "Deploying image gcr.io/${PROJECT_ID}/hello-cloudbuild:${SHORT_SHA}
+    Built from commit ${COMMIT_SHA} of repository hello-cloudbuild-app
+    Author: $(git log --format='%an <%ae>' -n 1 HEAD)" && \
+    git push origin candidate
+
+# [END cloudbuild-trigger-cd]

cloudbuild.yaml

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+# [START cloudbuild]
+steps:
+# This step runs the unit tests on the app
+- name: 'python:3.7-slim'
+  id: Test
+  entrypoint: /bin/sh
+  args:
+  - -c
+  - 'pip install flask && python test_app.py -v'
+
+# This step builds the container image.
+- name: 'gcr.io/cloud-builders/docker'
+  id: Build
+  args:
+  - 'build'
+  - '-t'
+  - 'gcr.io/$PROJECT_ID/hello-cloudbuild:$SHORT_SHA'
+  - '.'
+
+# This step pushes the image to Container Registry
+# The PROJECT_ID and SHORT_SHA variables are automatically
+# replaced by Cloud Build.
+- name: 'gcr.io/cloud-builders/docker'
+  id: Push
+  args:
+  - 'push'
+  - 'gcr.io/$PROJECT_ID/hello-cloudbuild:$SHORT_SHA'
+# [END cloudbuild]

kubernetes.yaml.tpl

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hello-cloudbuild
+  labels:
+    app: hello-cloudbuild
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: hello-cloudbuild
+  template:
+    metadata:
+      labels:
+        app: hello-cloudbuild
+    spec:
+      containers:
+      - name: hello-cloudbuild
+        image: gcr.io/GOOGLE_CLOUD_PROJECT/hello-cloudbuild:COMMIT_SHA
+        ports:
+        - containerPort: 8080
+---
+kind: Service
+apiVersion: v1
+metadata:
+  name: hello-cloudbuild
+spec:
+  selector:
+    app: hello-cloudbuild
+  ports:
+  - protocol: TCP
+    port: 80
+    targetPort: 8080
+  type: LoadBalancer

test_app.py

+# Copyright 2018 Google LLC
+#
+# 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
+#
+#     https://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.
+
+import unittest
+from app import hello
+
+class TestHelloApp(unittest.TestCase):
+
+  def test_hello(self):
+    self.assertEqual(hello(), "Hello World!\n")
+
+if __name__ == '__main__':
+  unittest.main()