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#!/bin/bash

# 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.

apt-get update

apt-get -y install imagemagick

# Use the metadata server to get the configuration specified during

# instance creation. Read more about metadata here:

# https://cloud.google.com/compute/docs/metadata#querying

IMAGE_URL=$(curl http://metadata/computeMetadata/v1/instance/attributes/url -H "Metadata-Flavor: Google")

TEXT=$(curl http://metadata/computeMetadata/v1/instance/attributes/text -H "Metadata-Flavor: Google")

CS_BUCKET=$(curl http://metadata/computeMetadata/v1/instance/attributes/bucket -H "Metadata-Flavor: Google")

mkdir image-output

cd image-output

wget $IMAGE_URL

convert * -pointsize 30 -fill white -stroke black -gravity center -annotate +10+40 "$TEXT" output.png

# Create a Google Cloud Storage bucket.

gsutil mb gs://$CS_BUCKET

# Store the image in the Google Cloud Storage bucket and allow all users

# to read it.

gsutil cp -a public-read output.png gs://$CS_BUCKET/output.png