Class: KnifeDnsUpdate::DnsUpdate

Inherits:
Chef::Knife
  • Object
show all
Defined in:
lib/chef/knife/dns_update.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#cfg ⇒ Object (readonly)

Returns the value of attribute cfg.



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# File 'lib/chef/knife/dns_update.rb', line 35

def cfg
  @cfg
end

#entries ⇒ Object (readonly)

Returns the value of attribute entries.



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# File 'lib/chef/knife/dns_update.rb', line 35

def entries
  @entries
end

Instance Method Details

#entry(name, type, data) ⇒ Object 



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# File 'lib/chef/knife/dns_update.rb', line 37

def entry(name, type, data)
  @entries ||= {}

  name = nil if name == '@'
  fqdn = [name, cfg.subdomain, cfg.zone].compact.join('.') + '.'
  type = type.to_s.upcase

  if entries.key?([fqdn, type])
    ui.warn("Redefining #{fqdn} IN #{type} #{entries[[name,type]]} --> #{data}")
  elsif config[:verbosity] >= 2
    ui.info("Defining: #{fqdn} IN #{type} #{data}")
  end
  entries[[fqdn, type]] = data
end

#run ⇒ Object 



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# File 'lib/chef/knife/dns_update.rb', line 52

def run
  @cfg = Config.new('config/dns.rb')

  Chef::Node.list.keys.sort.map(&Chef::Node.method(:load)).each do |node|
    entry(node.name.gsub(/[^a-z0-9-]+/, '-'), *cfg.record_for_node(node))
  end

  cfg.entries.each do |name, optses|
    optses.each do |opts|
      entry(name, opts[:type], opts[:data]) if opts[:type] && opts[:data]
      entry(name, :a, opts[:a]) if opts[:a]
      entry(name, :cname, opts[:cname]) if opts[:cname]

      if opts[:block] && !(opts[:node] || opts[:query])
        # Bare block
        entry(name, *opts[:block].call)
      end

      is_root_record = (name == '@')

      if opts[:node]
        entry(name, *cfg.record_for_node(
          Chef::Node.load(opts[:node]), is_root_record, &opts[:block]))
      end

      if opts[:query]
        q = Chef::Search::Query.new
        q.search(:node, opts[:query]).first.each do |node|
          entry( name.sub('*', cfg.personalization_token(node)),
                 *cfg.record_for_node(node, is_root_record, &opts[:block]))
        end
      end
    end
  end

  dns_config = Chef::Config[:dns].dup
  dns_config[:provider] ||= 'AWS'
  if dns_config[:provider] == 'AWS'
    dns_config[:aws_access_key_id] ||= config[:aws_access_key_id]
    dns_config[:aws_secret_access_key] ||= config[:aws_secret_access_key]
  end
  dns = Fog::DNS.new(dns_config)
  zone = dns.zones.find { |z| z.domain =~ /#{Regexp.quote(cfg.zone)}\.?$/ }
  raise "No zone found for #{cfg.zone}; available zones: #{dns.zones.map(&:domain).join(', ')}" unless zone

  managed = Set.new

  zone.records.all!.each do |rec|
    next if %w(NS SOA).include? rec.type
    ui.info("Looking at: #{rec.name} IN #{rec.type} #{rec.value}") if config[:verbosity] >= 3

    if cfg.subdomain && rec.name !~ /#{Regexp.quote(cfg.subdomain)}\.#{Regexp.quote(cfg.zone)}\.?$/
      ui.info("Not in subdomain, skipping: #{rec.name} IN #{rec.type} #{rec.value}") if config[:verbosity] >= 1
      next
    end

    value = rec.value.respond_to?(:first) ? rec.value.first : rec.value
    if entries[[rec.name, rec.type]] == value
      # Record exists on server and has the same value. We leave it be.
      ui.info("= #{rec.name} IN #{rec.type} #{value}") if config[:verbosity] >= 1
      managed.add([rec.name, rec.type])
    else
      ui.info "- #{rec.name} IN #{rec.type} #{value}"
      rec.destroy unless config[:dry_run]
    end

    # FIXME next if cfg.subdomain && rec.name !~ /#{Regex.quote(cfg.subdomain).
  end

  entries.each do |resource, value|
    next if managed.include?(resource)
    name, type = resource
    ui.info "+ #{name} IN #{type} #{value}"
    zone.records.create(:name => name, :type => type, :value => value, :ttl => cfg.ttl) unless config[:dry_run]
  end
end