Push source code to GCS bucket and have knative build and deploy it

push.sh

#!/bin/bash
# Copyright 2019 Google LLC.
# SPDX-License-Identifier: Apache-2.0

if [[ $# -ne 2 ]]; then
    echo "Usage: $0 <Service Name> <Path>"
    exit 1
fi

service_name=$1
path=$2
docker_username=${DOCKER_USERNAME:?required}

bucket_name=source_code_$(date +%s)_$RANDOM

echo "Bucket Name: $bucket_name"
gsutil mb gs://$bucket_name
gsutil rsync $path gs://$bucket_name/
gsutil acl ch -u AllUsers:R gs://$bucket_name

tmp_dir=$(mktemp -d)
trap "rm -rf $tmp_dir" EXIT

cat <<EOF > $tmp_dir/service.yaml
apiVersion: serving.knative.dev/v1alpha1
kind: Service
metadata:
  name: $service_name
  namespace: default
spec:
  runLatest:
    configuration:
      build:
        apiVersion: build.knative.dev/v1alpha1
        kind: Build
        spec:
          serviceAccountName: build-bot
          source:
            custom:
              image: gcr.io/cloud-builders/gsutil
              args: ["rsync", "gs://$bucket_name/", "."]
          template:
            name: kaniko
            arguments:
            - name: IMAGE
              value: docker.io/$docker_username/$service_name:latest
      revisionTemplate:
        spec:
          container:
            image: docker.io/$docker_username/$service_name:latest
            imagePullPolicy: Always
            env:
              - name: SIMPLE_MSG
                value: "Hello from the sample app!"
EOF

kubectl apply --filename $tmp_dir/service.yaml