Class: Chef::Provider::Service::Upstart

Inherits:
Simple show all
Defined in:
lib/chef/provider/service/upstart.rb

Constant Summary collapse

UPSTART_STATE_FORMAT =
/\S+ \(?(start|stop)?\)? ?[\/ ](\w+)/

Instance Attribute Summary collapse

Attributes inherited from Simple

#status_load_success

Attributes inherited from Chef::Provider

#action, #cookbook_name, #current_resource, #new_resource, #recipe_name, #run_context

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Simple

#shared_resource_requirements

Methods inherited from Chef::Provider::Service

#action_disable, #action_enable, #action_mask, #action_reload, #action_restart, #action_start, #action_stop, #action_unmask, #load_new_resource_state, #mask_service, #shared_resource_requirements, #supports, #unmask_service, #user_services_requirements

Methods inherited from Chef::Provider

action, #action_nothing, #check_resource_semantics!, #cleanup_after_converge, #compile_and_converge_action, #converge_by, #converge_if_changed, #events, include_resource_dsl?, include_resource_dsl_module, #node, #process_resource_requirements, provides, provides?, #requirements, #resource_collection, #resource_updated?, #run_action, #set_updated_status, use_inline_resources, #whyrun_mode?, #whyrun_supported?

Methods included from Mixin::Provides

#provided_as, #provides, #provides?

Methods included from Mixin::DescendantsTracker

#descendants, descendants, #direct_descendants, direct_descendants, #find_descendants_by_name, find_descendants_by_name, #inherited, store_inherited

Methods included from Mixin::LazyModuleInclude

#descendants, #include, #included

Methods included from Mixin::NotifyingBlock

#notifying_block, #subcontext_block

Methods included from DSL::DeclareResource

#build_resource, #declare_resource, #delete_resource, #delete_resource!, #edit_resource, #edit_resource!, #find_resource, #find_resource!, #with_run_context

Methods included from Mixin::ShellOut

#a_to_s, #clean_array, #shell_out, #shell_out!, #shell_out_compact, #shell_out_compact!, #shell_out_compact_timeout, #shell_out_compact_timeout!, #shell_out_with_systems_locale, #shell_out_with_systems_locale!

Methods included from Mixin::PathSanity

#enforce_path_sanity, #sanitized_path

Methods included from Mixin::PowershellOut

#powershell_out, #powershell_out!

Methods included from Mixin::WindowsArchitectureHelper

#assert_valid_windows_architecture!, #disable_wow64_file_redirection, #forced_32bit_override_required?, #is_i386_process_on_x86_64_windows?, #node_supports_windows_architecture?, #node_windows_architecture, #restore_wow64_file_redirection, #valid_windows_architecture?, #with_os_architecture, #wow64_architecture_override_required?, #wow64_directory

Methods included from DSL::PlatformIntrospection

#docker?, #platform?, #platform_family?, #value_for_platform, #value_for_platform_family

Constructor Details

#initialize(new_resource, run_context) ⇒ Upstart

Upstart does more than start or stop a service, creating multiple 'states' [1] that a service can be in. In chef, when we ask a service to start, we expect it to have started before performing the next step since we have top down dependencies. Which is to say we may follow witha resource next that requires that service to be running. According to [2] we can trust that sending a 'goal' such as start will not return until that 'goal' is reached, or some error has occurred.

[1] http://upstart.ubuntu.com/wiki/JobStates [2] http://www.netsplit.com/2008/04/27/upstart-05-events/

Raises:

  • (ArgumentError)

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# File 'lib/chef/provider/service/upstart.rb', line 50

def initialize(new_resource, run_context)
  # TODO: re-evaluate if this is needed after integrating cookbook fix
  raise ArgumentError, "run_context cannot be nil" unless run_context
  super

  run_context.node

  # dup so we can mutate @job
  @job = @new_resource.service_name.dup

  if @new_resource.parameters
    @new_resource.parameters.each do |key, value|
      @job << " #{key}=#{value}"
    end
  end

  platform, version = Chef::Platform.find_platform_and_version(run_context.node)
  if platform == "ubuntu" && (8.04..9.04).cover?(version.to_f)
    @upstart_job_dir = "/etc/event.d"
    @upstart_conf_suffix = ""
  else
    @upstart_job_dir = "/etc/init"
    @upstart_conf_suffix = ".conf"
  end

  @command_success = true # new_resource.status_command= false, means upstart used
  @config_file_found = true
  @upstart_command_success = true
end

Instance Attribute Details

#upstart_service_runningObject

to maintain a local state of service across restart's internal calls


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# File 'lib/chef/provider/service/upstart.rb', line 29

def upstart_service_running
  @upstart_service_running
end

Class Method Details

.supports?(resource, action) ⇒ Boolean


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# File 'lib/chef/provider/service/upstart.rb', line 37

def self.supports?(resource, action)
  Chef::Platform::ServiceHelpers.config_for_service(resource.service_name).include?(:upstart)
end

Instance Method Details

#define_resource_requirementsObject


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# File 'lib/chef/provider/service/upstart.rb', line 80

def define_resource_requirements
  # Do not call super, only call shared requirements
  shared_resource_requirements
  requirements.assert(:all_actions) do |a|
    if !@command_success
      whyrun_msg = if @new_resource.status_command
                     "Provided status command #{@new_resource.status_command} failed."
                   else
                     "Could not determine upstart state for service"
                   end
    end
    a.assertion { @command_success }
    # no failure here, just document the assumptions made.
    a.whyrun "#{whyrun_msg} Assuming service installed and not running."
  end

  requirements.assert(:all_actions) do |a|
    a.assertion { @config_file_found }
    # no failure here, just document the assumptions made.
    a.whyrun "Could not find #{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}. Assuming service is disabled."
  end
end

#disable_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 234

def disable_service
  Chef::Log.debug("#{@new_resource} upstart lacks inherent support for disabling services, editing job config file")
  conf = Chef::Util::FileEdit.new("#{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}")
  conf.search_file_replace(/^start on/, "#start on")
  conf.write_file
end

#enable_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 227

def enable_service
  Chef::Log.debug("#{@new_resource} upstart lacks inherent support for enabling services, editing job config file")
  conf = Chef::Util::FileEdit.new("#{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}")
  conf.search_file_replace(/^#start on/, "start on")
  conf.write_file
end

#load_current_resourceObject


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# File 'lib/chef/provider/service/upstart.rb', line 103

def load_current_resource
  @current_resource = Chef::Resource::Service.new(@new_resource.name)
  @current_resource.service_name(@new_resource.service_name)

  # Get running/stopped state
  # We do not support searching for a service via ps when using upstart since status is a native
  # upstart function. We will however support status_command in case someone wants to do something special.
  if @new_resource.status_command
    Chef::Log.debug("#{@new_resource} you have specified a status command, running..")

    begin
      if shell_out!(@new_resource.status_command).exitstatus == 0
        @upstart_service_running = true
      end
    rescue
      @command_success = false
      @upstart_service_running = false
      nil
    end
  else
    begin
      if upstart_goal_state == "start"
        @upstart_service_running = true
      else
        @upstart_service_running = false
      end
    rescue Chef::Exceptions::Exec
      @command_success = false
      @upstart_service_running = false
      nil
    end
  end
  # Get enabled/disabled state by reading job configuration file
  if ::File.exists?("#{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}")
    Chef::Log.debug("#{@new_resource} found #{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}")
    ::File.open("#{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}", "r") do |file|
      while line = file.gets
        case line
        when /^start on/
          Chef::Log.debug("#{@new_resource} enabled: #{line.chomp}")
          @current_resource.enabled true
          break
        when /^#start on/
          Chef::Log.debug("#{@new_resource} disabled: #{line.chomp}")
          @current_resource.enabled false
          break
        end
      end
    end
  else
    @config_file_found = false
    Chef::Log.debug("#{@new_resource} did not find #{@upstart_job_dir}/#{@new_resource.service_name}#{@upstart_conf_suffix}")
    @current_resource.enabled false
  end

  @current_resource.running @upstart_service_running
  @current_resource
end

#reload_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 214

def reload_service
  if @new_resource.reload_command
    super
  else
    # upstart >= 0.6.3-4 supports reload (HUP)
    shell_out_with_systems_locale!("/sbin/reload #{@job}")
  end

  @upstart_service_running = true
end

#restart_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 194

def restart_service
  if @new_resource.restart_command
    super
  # Upstart always provides restart functionality so we don't need to mimic it with stop/sleep/start.
  # Older versions of upstart would fail on restart if the service was currently stopped, check for that. LP:430883
  # But for safe working of latest upstart job config being loaded, 'restart' can't be used as per link
  # http://upstart.ubuntu.com/cookbook/#restart (it doesn't uses latest jon config from disk but retains old)
  else
    if @upstart_service_running
      stop_service
      sleep 1
      start_service
    else
      start_service
    end
  end

  @upstart_service_running = true
end

#start_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 162

def start_service
  # Calling start on a service that is already started will return 1
  # Our 'goal' when we call start is to ensure the service is started
  if @upstart_service_running
    Chef::Log.debug("#{@new_resource} already running, not starting")
  else
    if @new_resource.start_command
      super
    else
      shell_out_with_systems_locale!("/sbin/start #{@job}")
    end
  end

  @upstart_service_running = true
end

#stop_serviceObject


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# File 'lib/chef/provider/service/upstart.rb', line 178

def stop_service
  # Calling stop on a service that is already stopped will return 1
  # Our 'goal' when we call stop is to ensure the service is stopped
  unless @upstart_service_running
    Chef::Log.debug("#{@new_resource} not running, not stopping")
  else
    if @new_resource.stop_command
      super
    else
      shell_out_with_systems_locale!("/sbin/stop #{@job}")
    end
  end

  @upstart_service_running = false
end

#upstart_goal_stateObject


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# File 'lib/chef/provider/service/upstart.rb', line 241

def upstart_goal_state
  command = "/sbin/status #{@job}"
  so = shell_out(command)
  so.stdout.each_line do |line|
    # service goal/state
    # OR
    # service (instance) goal/state
    # OR
    # service (goal) state
    line =~ UPSTART_STATE_FORMAT
    data = Regexp.last_match
    return data[1]
  end
end