Idempotent Gcloud Compute Create

gcloud-script-box.sh

#!/bin/bash

# BEGIN SANITY BOX------------------------------------------
set -e           # immediately exit if any command fails |
set -u           # immediately fail on undefined variables |
set -o pipefail  # show error of last failed command       |
IFS=$'\n\t'      # control what word splitting means       |
# END SANITY BOX--------------------------------------------

# delete
# echo Y | gcloud compute instances delete $(NAME) --zone=$(ZONE)

CURRENT_INSTANCES=$(gcloud compute instances list | grep one-off-script-box)
NAME=one-off-script-box-$(uuidgen | cut -c 1-6 | tr '[:upper:]' '[:lower:]')
ZONE=us-west1-c
IMAGE=cloud-train
SCOPES=https://www.googleapis.com/auth/devstorage.full_control,https://www.googleapis.com/auth/datastore

if [ -z "$CURRENT_INSTANCES" ]
    then
        echo "> creating '${NAME}' in zone '${ZONE}'"

        gcloud compute instances create $NAME \
          --description a-one-off-script-box \
          --machine-type f1-micro \
          --zone $ZONE \
          --image $IMAGE \
          --scopes $SCOPES
          # --image-project debian-cloud \


else
    echo "Instances already exist:"
    echo $CURRENT_INSTANCES

    CURRENT_INSTANCES=(${CURRENT_INSTANCES[@]})
    FIRST_INSTANCE=${CURRENT_INSTANCES[0]}

    NAME=$(echo $FIRST_INSTANCE | awk '{print $1}')
    ZONE=$(echo $FIRST_INSTANCE | awk '{print $2}')
fi

echo "> entering '${NAME}' in zone '${ZONE}'"
gcloud compute ssh $NAME --zone=$ZONE