task.rb (97a2c49) - rcm

task.rb

#!/usr/bin/ruby

require_relative 'objects/rcm_file'
require_relative 'objects/rcm_package'
require_relative 'objects/rcm_service'
require_relative 'managers/rcm_package_manager'
require_relative 'managers/rcm_file_manager'
require_relative 'managers/rcm_service_manager'
require_relative 'rcm_utils'
require 'yaml'
require 'logger'

module RCM
  PACKAGES = 'packages'.freeze
  FILES = 'files'.freeze
  SERVICES = 'services'.freeze
  VALID_LOG_LEVELS = %w(fatal error info debug).freeze
  RCM_ENV = ENV.fetch('ENVIRONMENT', '')

@@wanted = {
    PACKAGES => {},
    FILES => {},
    SERVICES => {}
  }

@@got = {
    PACKAGES => {},
    FILES => {},
    SERVICES => {}
  }

@@crackalackin = {
    PACKAGES => [],
    FILES => [],
    SERVICES => []
  }

@@logger = ::Logger.new(STDOUT)

@@pkg_mgr = ::RCM::Apt.new(@@logger)
  @@file_mgr = ::RCM::FileManager.new(@@logger)
  @@svc_mgr = ::RCM::ServiceManager.new(@@logger)

def self.configure_logger
    # Can be exposed as settings but was expanding the scope as this
    # object will need to be passed to all other objects
    @@logger.level = ::Logger::DEBUG
    @@logger.progname = 'rcm'
  end

def self.parse_packages(markup)
    @@logger.info("Environment = #{RCM_ENV}")
    @@pkg_mgr.update unless RCM_ENV == 'dev'

markup.each do |d|
      # ensure package version exists, if mentioned.
      version = d.fetch('version', '')
      desired_state = d.fetch('desired_state', ::RCM::Package::INSTALLED)

valid_package_states = [::RCM::Package::INSTALLED, ::RCM::Package::REMOVED]

if (valid_package_states & [desired_state]).empty?
        raise "Unknown desired_state: #{desired_state}. Valid states: #{valid_package_states.join(', ')}"
      end

unless version.empty?
        available_versions = @@pkg_mgr.get_versions(d['name'])
        if (available_versions & [version]).empty?
          raise "\n\n#{d['name']} = #{version} is not available.\nAvailable versions: #{available_versions.join(', ')}"
        end
      end
      p = RCM::Package.new(d['name'], version, desired_state)
      @@wanted[PACKAGES][d['name']] = p
    end
  end

def self.parse_files(markup)
    markup.each do |d|
      raise "\n\n'#{d['local_file']}' is not readable.\n\n" unless ::File.readable?(d['local_file'])
      f = RCM::File.new(d['path'], d['owner'], d['group'], d['mode'], d['local_file'])
      @@wanted[FILES][d['path']] = f
    end
  end

def self.parse_services(markup)
    pkgs = @@wanted[PACKAGES]
    files = @@wanted[FILES]
    file_dependencies = {}
    package_dependencies = {}
    markup.each do |d|
      dependencies = d.fetch('dependencies', {})
      dependencies.each do |values|
        values.each do |dep_type, dep|
          case dep_type
          when PACKAGES
            dep.each do |pkg_definition|
              pkg_name = pkg_definition['name']
              raise "\n\nPlease ensure #{pkg_name} is managed by this program before adding it as a dependency.\n\n" unless pkgs.key?(pkg_name)
              p = pkgs[pkg_name]
              package_dependencies[pkg_name] = p
            end
          when FILES
            dep.each do |file_defnition|
              path = file_defnition['path']
              raise "\n\nPlease ensure #{path} is managed by this program before adding it as a dependency.\n\n" unless files.key?(path)

f = files[path]
              file_dependencies[path] = f
            end
          end
        end

end
      s = RCM::Service.new(d['name'], file_dependencies, package_dependencies)
      @@wanted[SERVICES][d['name']] = s
    end
  end

def self.whachuwant # or parse_config
    # Consume config from YAML, and convert it to usable objects in @@wanted.
    config_file = RCM_ENV.empty? ? 'config.yaml' : "config_#{RCM_ENV}.yaml"

raise "#{config_file} not found." unless ::File.readable?(config_file)

config = YAML.load_file(config_file)
    config.each do |yaml_objects|
      yaml_objects.each do |collection, resource_definition|
        case collection
        when PACKAGES
          parse_packages(resource_definition)

when FILES
          parse_files(resource_definition)

when SERVICES
          parse_services(resource_definition)
        end
      end
    end

end

def self.whachugot # or get_current_state
    @@got[PACKAGES] = @@pkg_mgr.get_current_state(@@wanted[PACKAGES])
    @@got[FILES] = @@file_mgr.get_current_state(@@wanted[FILES])
    # @@got[SERVICES] = @@svc_mgr.get_current_state(@@wanted[SERVICES])
  end

def self.converge_packages
    @@wanted[PACKAGES].each do |pkg_name, pkg_obj|
      current_pkg = @@got[PACKAGES][pkg_name]

if current_pkg == pkg_obj
        @@logger.info("#{pkg_name} is in expected state.")
        next
      end

@@logger.debug('Missing package:' + pkg_name)
      if current_pkg.version != pkg_obj.version && current_pkg.state == ::RCM::Package::INSTALLED
        # Wrong version is installed. Remove current version and install the correct one.
        # Not the best way to go about it... but we are not implementing a legit solution.
        @logger.debug("#{current_pkg.name}=#{current_pkg.version} is installed. Uninstalling first.")
        @@pkg_mgr.remove(pkg_obj)
        @@pkg_mgr.install(pkg_obj)
      elsif current_pkg.state == ::RCM::Package::REMOVED
        @@pkg_mgr.install(pkg_obj)
      end
    end

end

def self.converge_files
    @@wanted[FILES].each do |path, file_obj|
      file_on_fs = @@got[FILES][path]

if file_on_fs == file_obj
        @@logger.info("#{path} is in expected state.")
        next
      end

# try to do minimal changes by finding what is different
      if file_on_fs.path.empty?
        # for files, we're not doing explicit state maintenance like we are doing for packages
        # If file is on disk, file obj will contain the path.
        @@logger.info("#{path} is not present on disk.")
        @@file_mgr.copy(file_obj)
        @@file_mgr.apply_attributes(file_obj)
      elsif file_on_fs.mode != file_obj.mode ||
          file_on_fs.owner != file_obj.owner ||
          file_on_fs.group != file_obj.group
        @@logger.debug("Attributes on #{path} are not in expected state.")
        @@file_mgr.apply_attributes(file_obj)
      elsif !::File.cmp(file_obj.src_path, path)
        @@logger.debug("File contents don't match, even though #{path} is on disk.")
        @@file_mgr.remove(file_obj)
        @@file_mgr.copy(file_obj)
        @@file_mgr.apply_attributes(file_obj)
      end

# Set the version correctly
      @@crackalackin[FILES].push(file_obj)
    end
  end

def self.restart_services_if_needed
    @@wanted[SERVICES].values.each do |svc_obj|
      @@svc_manager.restart(svc_obj) if @@svc_mgr.dependencies_changed?(svc_obj)
    end
  end

def main
    configure_logger
    whachuwant
    whachugot
    converge_packages
    converge_files
    restart_services_if_needed
  end

module_function :main
end

RCM.main

rcm

Converging the state as defined by config.