Class: Chef::Provider::Cron

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

Instance Attribute Summary collapse

Attributes inherited from Chef::Provider

#current_resource, #new_resource, #node

Instance Method Summary collapse

Methods included from Mixin::Command

handle_command_failures, not_if, only_if, output_of_command, popen4, run_command, run_command_with_systems_locale

Methods inherited from Chef::Provider

#action_nothing, build_from_file

Methods included from Mixin::ConvertToClassName

#convert_to_class_name, #filename_to_qualified_string

Methods included from Mixin::RecipeDefinitionDSLCore

#method_missing

Constructor Details

#initialize(node, new_resource, collection = nil, definitions = nil, cookbook_loader = nil) ⇒ Cron

Returns a new instance of Cron.



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# File 'lib/chef/provider/cron.rb', line 28

def initialize(node, new_resource, collection=nil, definitions=nil, cookbook_loader=nil)
  super(node, new_resource, collection, definitions, cookbook_loader)
  @cron_exists = false
  @cron_empty = false
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class Chef::Mixin::RecipeDefinitionDSLCore

Instance Attribute Details

#cron_empty ⇒ Object

Returns the value of attribute cron_empty.



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

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 33

def cron_exists
  @cron_exists
end

Instance Method Details

#action_create ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 95

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
  newcron << "#{@new_resource.minute} #{@new_resource.hour} #{@new_resource.day} #{@new_resource.month} #{@new_resource.weekday} #{@new_resource.command}\n"

  if @cron_exists
    unless compare_cron
      Chef::Log.debug("Skipping existing cron entry '#{@new_resource.name}'")
      return
    end
    status = popen4("crontab -l -u #{@new_resource.user}") do |pid, stdin, stdout, stderr|
      stdout.each_line do |line|
        case line
        when /^# Chef Name: #{@new_resource.name}\n/
          cron_found = true
          next
        when /([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*(.*)/
          if cron_found
            cron_found = false
            crontab << newcron
            next
          end
        else
          next if cron_found
        end
        crontab << line 
      end
    end

    status = popen4("crontab -u #{@new_resource.user} -", :waitlast => true) do |pid, stdin, stdout, stderr|
      crontab.each { |line| stdin.puts "#{line}" }
      stdin.close rescue nil
    end
    Chef::Log.info("Updated cron '#{@new_resource.name}'")
    @new_resource.updated = true
  else
    unless @cron_empty
      status = popen4("crontab -l -u #{@new_resource.user}") do |pid, stdin, stdout, stderr|
        stdout.each { |line| crontab << line }
      end
    end
  
    crontab << newcron

    status = popen4("crontab -u #{@new_resource.user} -", :waitlast => true) do |pid, stdin, stdout, stderr|
      crontab.each { |line| stdin.puts "#{line}" }
      stdin.close rescue nil
    end
    Chef::Log.info("Added cron '#{@new_resource.name}'")
    @new_resource.updated = true
  end
end

#action_delete ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 154

def action_delete
  if @cron_exists
    crontab = String.new
    cron_found = false
    status = popen4("crontab -l -u #{@new_resource.user}") do |pid, stdin, stdout, stderr|
      stdout.each_line do |line|
        case line
        when /^# Chef Name: #{@new_resource.name}\n/
          cron_found = true
          next
        when /([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*(.*)/
          if cron_found
            cron_found = false
            next
          end
        else
          next if cron_found
        end
        crontab << line 
      end
    end

    status = popen4("crontab -u #{@new_resource.user} -", :waitlast => true) do |pid, stdin, stdout, stderr|
      crontab.each { |line| stdin.puts "#{line}" }
      stdin.close rescue nil
    end
    Chef::Log.debug("Deleted cron '#{@new_resource.name}'")
    @new_resource.updated = true
  end
end

#compare_cron ⇒ Object 



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# File 'lib/chef/provider/cron.rb', line 89

def compare_cron
  [ :minute, :hour, :day, :month, :weekday, :command, :mailto, :path, :shell, :home ].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 35

def load_current_resource
  crontab = String.new
  @current_resource = Chef::Resource::Cron.new(@new_resource.name)
  @current_resource.user(@new_resource.user)
  status = popen4("crontab -l -u #{@new_resource.user}") do |pid, stdin, stdout, stderr|
    stdout.each { |line| crontab << line }
  end
  if status.exitstatus > 1
    raise Chef::Exceptions::Cron, "Error determining state of #{@new_resource.name}, exit: #{status.exitstatus}"
  elsif status.exitstatus == 0
    cron_found = false
    crontab.each do |line|
      case line
      when /^# Chef Name: #{@new_resource.name}/
        Chef::Log.debug("Found cron '#{@new_resource.name}'")
        cron_found = true
        @cron_exists = true
        next
      when /^MAILTO=(\S*)/
        @current_resource.mailto($1) if cron_found
        next
      when /^PATH=(\S*)/
        @current_resource.path($1) if cron_found
        next
      when /^SHELL=(\S*)/
        @current_resource.shell($1) if cron_found
        next
      when /^HOME=(\S*)/
        @current_resource.home($1) if cron_found
        next
      when /^([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*([0-9\*]+)\s*(.*)/
        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
        next
      end
    end
    Chef::Log.debug("Cron '#{@new_resource.name}' not found") unless @cron_exists
  elsif status.exitstatus == 1
    Chef::Log.debug("Cron empty for '#{@new_resource.user}'")
    @cron_empty = true
  end
  
  @current_resource
end