pkg/god-0.1.0/lib/god/conditions/process_not_running.rb

   1 module God
   2   class ProcessNotRunning < Condition
   3     attr_accessor :pid_file, :clean
   4
   5     def initialize
   6       self.pid_file = nil
   7       self.clean = true
   8     end
   9
  10     def valid?
  11       valid = true
  12       valid = complain("You must specify the 'pid_file' attribute for :process_not_running") if self.pid_file.nil?
  13       valid
  14     end
  15
  16     def test
  17       return false unless File.exist?(self.pid_file)
  18       pid = File.open(self.pid_file).read.strip
  19       process_running?(pid)
  20     end
  21
  22     def after
  23       if self.clean
  24         File.delete(self.pid_file) rescue nil
  25       end
  26     end
  27
  28     private
  29
  30     def process_running?(pid)
  31       cmd_name = RUBY_PLATFORM =~ /solaris/i ? "args" : "command"
  32       ps_output = `ps -o #{cmd_name}= -p #{pid}`
  33       !ps_output.strip.empty?
  34     end
  35   end
  36 end