Class: Chef::Provider::Cron

Inherits:
Chef::Provider show all
Includes:
Mixin::Command
Defined in:
lib/chef/provider/cron.rb,
lib/chef/provider/cron/solaris.rb

Direct Known Subclasses

Solaris

Defined Under Namespace

Classes: Solaris

Constant Summary collapse

CRON_PATTERN = 
/\A([-0-9*,\/]+)\s([-0-9*,\/]+)\s([-0-9*,\/]+)\s([-0-9*,\/]+|[a-zA-Z]{3})\s([-0-9*,\/]+|[a-zA-Z]{3})\s(.*)/
ENV_PATTERN = 
/\A(\S+)=(\S*)/
CRON_ATTRIBUTES = 
[:minute, :hour, :day, :month, :weekday, :command, :mailto, :path, :shell, :home, :environment]

Instance Attribute Summary collapse

Attributes inherited from Chef::Provider

#action, #current_resource, #new_resource, #run_context

Instance Method Summary collapse

Methods included from Mixin::Command

#chdir_or_tmpdir, #handle_command_failures, #output_of_command, #run_command, #run_command_with_systems_locale

Methods included from Mixin::Command::Windows

#popen4

Methods included from Mixin::Command::Unix

#popen4

Methods inherited from Chef::Provider

#action_nothing, #cleanup_after_converge, #cookbook_name, #define_resource_requirements, #events, #node, #process_resource_requirements, #requirements, #resource_collection, #run_action, #set_updated_status, #whyrun_mode?

Methods included from DSL::Recipe

#method_missing

Methods included from Mixin::ConvertToClassName

#convert_to_class_name, #convert_to_snake_case, #filename_to_qualified_string, #snake_case_basename

Constructor Details

#initialize(new_resource, run_context) ⇒ Cron

Returns a new instance of Cron.



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# File 'lib/chef/provider/cron.rb', line 33

def initialize(new_resource, run_context)
  super(new_resource, run_context)
  @cron_exists = false
  @cron_empty = false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Chef::DSL::Recipe

Instance Attribute Details

#cron_empty ⇒ Object

Returns the value of attribute cron_empty.



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# File 'lib/chef/provider/cron.rb', line 38

def cron_empty
  @cron_empty
end

#cron_exists ⇒ Object

Returns the value of attribute cron_exists.



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# File 'lib/chef/provider/cron.rb', line 38

def cron_exists
  @cron_exists
end

Instance Method Details

#action_create ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 91

def action_create
  crontab = String.new
  newcron = String.new
  cron_found = false

  newcron << "# Chef Name: #{new_resource.name}\n"
  [ :mailto, :path, :shell, :home ].each do |v|
    newcron << "#{v.to_s.upcase}=#{@new_resource.send(v)}\n" if @new_resource.send(v)
  end
  @new_resource.environment.each do |name, value|
    newcron << "#{name}=#{value}\n"
  end
  newcron << "#{@new_resource.minute} #{@new_resource.hour} #{@new_resource.day} #{@new_resource.month} #{@new_resource.weekday} #{@new_resource.command}\n"

  if @cron_exists
    unless cron_different?
      Chef::Log.debug("Skipping existing cron entry '#{@new_resource.name}'")
      return
    end
    read_crontab.each_line do |line|
      case line.chomp
      when "# Chef Name: #{@new_resource.name}"
        cron_found = true
        next
      when ENV_PATTERN
        crontab << line unless cron_found
        next
      when CRON_PATTERN
        if cron_found
          cron_found = false
          crontab << newcron
          next
        end
      else
        if cron_found # We've got a Chef comment with no following crontab line
          crontab << newcron
          cron_found = false
        end
      end
      crontab << line
    end

    # Handle edge case where the Chef comment is the last line in the current crontab
    crontab << newcron if cron_found

    converge_by("update crontab entry for #{@new_resource}") do
      write_crontab crontab
      Chef::Log.info("#{@new_resource} updated crontab entry")
    end

  else
    crontab = read_crontab unless @cron_empty
    crontab << newcron

    converge_by("add crontab entry for #{@new_resource}") do
      write_crontab crontab
      Chef::Log.info("#{@new_resource} added crontab entry")
    end
  end
end

#action_delete ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 152

def action_delete
  if @cron_exists
    crontab = String.new
    cron_found = false
    read_crontab.each_line do |line|
      case line.chomp
      when "# Chef Name: #{@new_resource.name}"
        cron_found = true
        next
      when ENV_PATTERN
        next if cron_found
      when CRON_PATTERN
        if cron_found
          cron_found = false
          next
        end
      else
        # We've got a Chef comment with no following crontab line
        cron_found = false
      end
      crontab << line
    end
    description = cron_found ? "remove #{@new_resource.name} from crontab" : 
      "save unmodified crontab"
    converge_by(description) do
      write_crontab crontab
      Chef::Log.info("#{@new_resource} deleted crontab entry")
    end
  end
end

#cron_different? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/chef/provider/cron.rb', line 85

def cron_different?
  CRON_ATTRIBUTES.any? do |cron_var|
    !@new_resource.send(cron_var).nil? && @new_resource.send(cron_var) != @current_resource.send(cron_var)
  end
end

#load_current_resource ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 44

def load_current_resource
  crontab_lines = []
  @current_resource = Chef::Resource::Cron.new(@new_resource.name)
  @current_resource.user(@new_resource.user)
  if crontab = read_crontab
    cron_found = false
    crontab.each_line do |line|
      case line.chomp
      when "# Chef Name: #{@new_resource.name}"
        Chef::Log.debug("Found cron '#{@new_resource.name}'")
        cron_found = true
        @cron_exists = true
        next
      when ENV_PATTERN
        set_environment_var($1, $2) if cron_found
        next
      when CRON_PATTERN
        if cron_found
          @current_resource.minute($1)
          @current_resource.hour($2)
          @current_resource.day($3)
          @current_resource.month($4)
          @current_resource.weekday($5)
          @current_resource.command($6)
          cron_found=false
        end
        next
      else
        cron_found=false # We've got a Chef comment with no following crontab line
        next
      end
    end
    Chef::Log.debug("Cron '#{@new_resource.name}' not found") unless @cron_exists
  else
    Chef::Log.debug("Cron empty for '#{@new_resource.user}'")
    @cron_empty = true
  end

  @current_resource
end

#whyrun_supported? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/chef/provider/cron.rb', line 40

def whyrun_supported?
  true
end