Install & setup Google SDK tools in Ubuntu

install_gsutils.sh

#!/usr/bin/env bash

export SOURCE_FOLDER=/tmp
export DESTINATION_FOLDER=tmp
export BUCKET=backup_bucket
#echo "lalalalalala" > /tmp/lala.txt

# Service Account role: roles/storage.objectAdmin	= Storage Object Admin
export KEY=Service_Account.json
export NEWUSER=mybackup
export CRON="00 10 * * *"

# setup new user environment
if id -u $NEWUSER > /dev/null 2>&1; then
  useradd -s /bin/bash -m $NEWUSER
fi

export PRIVATE_KEY=/home/$NEWUSER/$KEY
cp ./$KEY $PRIVATE_KEY
chmod 400 $PRIVATE_KEY

export SSH_FOLDER=/home/$NEWUSER/.ssh && \
    mkdir -p $SSH_FOLDER && \
    chmod 700 $SSH_FOLDER && \
    echo "Host *" > $SSH_FOLDER/config && \
    echo "    StrictHostKeyChecking no" >> $SSH_FOLDER/config && \
    chmod 600 $SSH_FOLDER/config && \
    chown -Rf $NEWUSER:$NEWUSER /home/$NEWUSER

# install requirements
apt-get update && apt-get install -y lsb-core curl ssh jq && \
    export CLOUD_SDK_REPO="cloud-sdk-$(lsb_release -c -s)" && \
    echo "deb http://packages.cloud.google.com/apt $CLOUD_SDK_REPO main" | tee -a /etc/apt/sources.list.d/google-cloud-sdk.list && \
    curl https://packages.cloud.google.com/apt/doc/apt-key.gpg | apt-key add - && \
    apt-get update -y && apt-get install google-cloud-sdk -y

# gcloud activation
export CLIENT_EMAIL=$(jq '.client_email' $PRIVATE_KEY | cut -d "\"" -f 2)
export PROJECT_ID=$(jq '.project_id' $PRIVATE_KEY | cut -d "\"" -f 2)
sudo -H -u $NEWUSER -s bash gcloud auth activate-service-account $CLIENT_EMAIL --key-file=$PRIVATE_KEY --project=$PROJECT_ID

GSUTIL_COMMAND="/usr/bin/gsutil -m rsync -r $SOURCE_FOLDER gs://$BUCKET/$DESTINATION_FOLDER"
# cron job
export CRONTAB_FILE=/var/spool/cron/crontabs/$NEWUSER
echo "$CRON    $GSUTIL_COMMAND" >> $CRONTAB_FILE
chmod 600 $CRONTAB_FILE
chown $NEWUSER:crontab $CRONTAB_FILE

echo "Running: sudo -H -u $NEWUSER -s bash $GSUTIL_COMMAND"
sudo -H -u $NEWUSER -s bash $GSUTIL_COMMAND