Ruby script to find k8s namespaces which might be old sandboxes, and where we could ask the developer if it's still needed. ww

find-namespaces-to-delete.rb

#!/usr/bin/env ruby

# Script to find namespaces which are candidates for deletion (because they might be developer
# sandbox namespaces).
#
# USAGE:
#
#     kubectl get namespaces --output json | ./find-namespaces-to-delete.rb
#

require 'json'
require 'date'

AGE_THRESHOLD = 100 # days

def main
  hash = JSON.parse(STDIN.read)

  namespaces = hash['items'].find_all { |namespace| is_deletion_candidate?(namespace) }

  if namespaces.any?
    puts
    puts "The following namespaces are non-production, have dev-ish names, and are > #{AGE_THRESHOLD} days old:"
    puts
    namespaces.each {|n| puts '    ' + n['metadata']['name']}
    puts
  end
end

def is_deletion_candidate?(namespace)
  !(is_production?(namespace)) \
    && looks_like_sandbox?(namespace) \
    && is_old?(namespace)
end

def is_production?(namespace)
  labels = namespace['metadata']['labels']
  labels && labels['cloud-platform.justice.gov.uk/is-production'] == 'true'
end

def looks_like_sandbox?(namespace)
  namespace['metadata']['name'] =~ /myapp|dev|example|dummy/
end

def is_old?(namespace)
  age_in_days(namespace) > AGE_THRESHOLD
end

def age_in_days(namespace)
  (Date.today - Date.parse(namespace['metadata']['creationTimestamp'])).to_i
end

main