100.prereqs.sh

#!/usr/bin/env bash
set -euo pipefail

script_name="$(basename "${BASH_SOURCE[-1]}")"
readonly script_name

# Error logging function
function err() {
  echo >&2 "[$(date +'%Y-%m-%dT%H:%M:%S%z')] ${script_name:?}: $*"
  exit 1
}

### Check for presence of other variables/tools
# Variable - FACTORIO_ROOT
if [[ -z ${FACTORIO_ROOT:?} ]]; then
  err "FACTORIO_ROOT is not defined; it should be set to the root path of this project."
fi

# Tool - Google Cloud SDK
if ! hash gcloud 2> /dev/null; then
  err "Google Cloud SDK ('gcloud') required but not found:
- https://cloud.google.com/sdk/install"
fi

if ! hash gsutil 2> /dev/null; then
  err "Google Cloud SDK ('gsutil') required but not found:
- https://cloud.google.com/sdk/install"
fi

# Variable - Google Cloud SDK default project ID
if [[ -z ${CLOUDSDK_CORE_PROJECT:-} ]]; then
  if [[ -n ${GOOGLE_CLOUD_PROJECT:-} ]]; then
    # Provided by Google Cloud Shell
    CLOUDSDK_CORE_PROJECT=$GOOGLE_CLOUD_PROJECT
  else
    err "The 'CLOUDSDK_CORE_PROJECT' environment variable needs to be exported with your Google Cloud project ID." \
      "See also:" \
      "https://cloud.google.com/sdk/gcloud/reference/topic/startup" \
      "https://cloud.google.com/sdk/gcloud/reference/topic/configurations"
  fi
fi

# Make sure it propagates in the environment from here onwards
declare -rx CLOUDSDK_CORE_PROJECT="$CLOUDSDK_CORE_PROJECT"

# Tool - JQ
if ! hash jq 2> /dev/null; then
  err "'jq' required but not found:
- https://github.com/stedolan/jq/wiki/Installation"
fi