Google Cloud Platform Kubernetes cluster switcher

switch-cluster.sh

#!/bin/bash

# caution: quick hack!

# -- project selection

PROJECT_IDS=()
PROJECT_NAMES=()

IFS_ORIG=$IFS
IFS='
'
for LINE in $(gcloud projects list 2>/dev/null | tail -n +2)
do
  IFS=$IFS_ORIG
  LINE=($LINE)
  PROJECT_IDS+=(${LINE[0]})
  PROJECT_NAMES+=(${LINE[1]})
done
IFS=$IFS_ORIG

PROJECT_SELECTION=0
while [[ $PROJECT_SELECTION -lt 1 || $PROJECT_SELECTION -gt ${#PROJECT_IDS[@]} ]]
  do
  echo "Projects:"
  for ((i=0; i < ${#PROJECT_IDS[@]}; i++))
  do
      printf "%3s: %-30s (%s)\n" "$((i + 1))" "${PROJECT_NAMES[${i}]}" "${PROJECT_IDS[${i}]}"
  done
  echo -n "Select project: "
  read PROJECT_SELECTION
done
((PROJECT_SELECTION--))

gcloud config set project ${PROJECT_IDS[${PROJECT_SELECTION}]}

# --- cluster selection

CLUSTER_NAMES=()
CLUSTER_ZONES=()

IFS_ORIG=$IFS
IFS='
'
for LINE in $(gcloud container clusters list 2>/dev/null | tail -n +2)
do
  IFS=$IFS_ORIG
  LINE=($LINE)
  CLUSTER_NAMES+=(${LINE[0]})
  CLUSTER_ZONES+=(${LINE[1]})
done
IFS=$IFS_ORIG

CLUSTER_SELECTION=0
if [ "${#CLUSTER_NAMES[@]}" -eq 1 ]
then
  echo "Automatically selecting the only cluster in project ${PROJECT_IDS[${PROJECT_SELECTION}]}."
  CLUSTER_SELECTION=1
fi
while [[ $CLUSTER_SELECTION -lt 1 || $CLUSTER_SELECTION -gt ${#CLUSTER_NAMES[@]} ]]
  do
  echo "Cluster:"
  for ((i=0; i < ${#CLUSTER_NAMES[@]}; i++))
  do
      printf "%3s: %-30s (%s)\n" "$((i + 1))" "${CLUSTER_NAMES[${i}]}" "${CLUSTER_ZONES[${i}]}"
  done
  echo -n "Select cluster: "
  read CLUSTER_SELECTION
done
((CLUSTER_SELECTION--))

gcloud container clusters get-credentials ${CLUSTER_NAMES[${CLUSTER_SELECTION}]} -z ${CLUSTER_ZONES[${CLUSTER_SELECTION}]}

echo ">>> You are now on ${PROJECT_IDS[${PROJECT_SELECTION}]}/${CLUSTER_NAMES[${CLUSTER_SELECTION}]} <<<"