lib/god/process.rb

   1 module God
   2   class Process
   3     attr_accessor :name, :uid, :gid, :start, :stop, :restart, :pidfile
   4
   5     def initialize(options={})
   6       options.each do |k,v|
   7         send("#{k}=", v)
   8       end
   9     end
  10
  11     def start!
  12       call_action(:start)
  13     end
  14
  15     def stop!
  16       call_action(:stop)
  17     end
  18
  19     def restart!
  20       call_action(:restart)
  21     end
  22
  23     def call_action(action)
  24       command = send(action)
  25       if command.kind_of?(String)
  26         # string command
  27         # fork/exec to setuid/gid
  28         fork {
  29           Process::Sys.setgid(Etc.getgrnam(self.gid).gid) if self.gid
  30           Process::Sys.setuid(Etc.getpwnam(self.uid).uid) if self.uid
  31           $0 = command
  32           exec command
  33         }
  34       elsif command.kind_of?(Proc)
  35         # lambda command
  36         command.call
  37       else
  38         raise NotImplementedError
  39       end
  40     end
  41   end
  42 end