Count terraform workspace managed resources

count_workspace_resources.sh

#!/bin/bash
set -euo pipefail

count_managed_resources() {
  jq '[.resources[] | select(.mode == "managed") | select(.type == "terraform_data" or .type == "null_resource" | not) | .instances | flatten[]] | length'
}

ROOT_DIR=${1:-.}
ABS_ROOT_DIR=$(readlink -f "$ROOT_DIR")

total_workspaces=0
total_managed_resources=0
while read -r backend_file; do
  dir=$(dirname "$backend_file")
  initial_workspace=$(terraform -chdir="$dir" workspace show)
  workspaces=$(terraform -chdir="$dir" workspace list | perl -pe 's/^\*?\s+//g')
  for workspace in $workspaces; do
    terraform -chdir="$dir" workspace select "$workspace" >/dev/null
    managed_resources=$(terraform -chdir="$dir" state pull | count_managed_resources)
    total_managed_resources=$((total_managed_resources + managed_resources))
    total_workspaces=$((total_workspaces + 1))
    echo "Amount of managed resources in workspace $workspace: $managed_resources"
  done

  if [[ $(terraform -chdir="$dir" workspace show) != "$initial_workspace" ]]; then
    terraform -chdir="$dir" workspace select "$initial_workspace" >/dev/null
  fi
done < <(find "$ABS_ROOT_DIR" -type f -name "backend.tf")

echo
echo "Total number of managed resources: $total_managed_resources"
echo "Total number of workspaces: $total_workspaces"