delete_rg_by_pattern.sh

#!/usr/bin/env bash

set -euo pipefail

IFS=$'\n'

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

source ${DIR}/functions.sh

print-usage() {
  echo "
    This script deletes resource groups whose name matches given pattern on the given subscription if there is no meaningful activites on the resource group in the given length of time..
    The script takes 4 arguments: Id of the subscription to work on, pattern to match resource group's name for deletion, length of time to check, and/or whether it's a 'realrun'. 
    In dryrun mode, resource groups will be examed but not deleted. Any string other than 'realrun' will result in dryrun.
    e.g. 
    $0 'my-test-subscrioption' 'test-resource-group' 4h  --> dry run
    $0 'my-test-subscrioption' 'pattern' 4h realrun --> real run
    $0 'my-test-subscrioption' 'pattern' 4h realrun | tee ./log  --> real run with logs recorded
  "
}

# Errors
INVALID_ARGS=8001

if (( $# < 2 )); then
  print-usage
  exit ${INVALID_ARGS}
fi

subId=$1
pattern=$2
length=$3
realRun=0
if (( $# == 4 )) && [ $4 == 'realrun' ]; then
  realRun=1
fi
echo "Delete resource groups with no activity in last '${length}' matching '${pattern}' in subscription '${subId}' 'realrun'=${realRun}"

cmd="az group list --subscription '${subId}' --query \"[?contains(name, '$pattern')].{name:name, location:location, managedBy:managedBy, state:properties.provisioningState, preserve:tags.preserve}\" -o tsv"
echo "$cmd"
rgs=`eval ${cmd}`

rgCnt=$(echo "$rgs" | wc -l)
echo "FOUND "${rgCnt}" RGs MATCHING '${pattern}' IN SUBSCRIPTION '${subId}'"

for line in ${rgs}
do
  #echo ${line}
  #readarray -t -d $'\t' f <<< $line
  IFS=$'\t'  read -r -a f <<< $line
  echo
  echo "+++++++++++++PROCESS RG: "${f[0]}"+++++++++++++"
  # skip managed rg and rg in Deleting state
  if [ ${f[3]} == 'Deleting' ]; then
    echo "SKIP RG UNDER DELETION: "${f[0]}
    continue
  fi
  if [  ${f[4]} != 'None' ]; then
    echo "SKIP PRESERVED RG: "${f[0]}
  else
    activities="$(get-non-audit-activities $subId ${f[0]} $length)"
    if [ -z "${activities}" ]; then
      echo "NO NON-AUDIT ACTIVITIES IN LAST $length. SHOULD DELETE: ${f[0]}"
      cmd="time az group delete --no-wait -y --subscription '${subId}' -n ${f[0]}"
      echo $cmd
      if [ $realRun == 1 ]; then
        eval $cmd || : # Do not exit on error on deletion
      fi
    else
      echo "DETECTED ACTIVITIES: "
      echo "${activities}"
    fi
  fi
done 
# reset IFS
IFS=$'\n'