Class: FireAndForget::Command::Fire

Inherits:
CommandBase show all
Defined in:
lib/fire_and_forget/command/fire.rb

Instance Attribute Summary collapse

Attributes inherited from CommandBase

#params, #tag, #task

Instance Method Summary collapse

Methods inherited from CommandBase

#dump, #merge_params

Constructor Details

#initialize(task, params = {}) ⇒ Fire

Returns a new instance of Fire.



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# File 'lib/fire_and_forget/command/fire.rb', line 9

def initialize(task, params={})
  super
  @task_uid = Process.euid
  @task_gid = Process.egid
end

Instance Attribute Details

#niceness ⇒ Object (readonly)

Returns the value of attribute niceness.



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# File 'lib/fire_and_forget/command/fire.rb', line 7

def niceness
  @niceness
end

#task_gid ⇒ Object (readonly)

Returns the value of attribute task_gid.



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# File 'lib/fire_and_forget/command/fire.rb', line 7

def task_gid
  @task_gid
end

#task_uid ⇒ Object (readonly)

Returns the value of attribute task_uid.



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# File 'lib/fire_and_forget/command/fire.rb', line 7

def task_uid
  @task_uid
end

Instance Method Details

#binary ⇒ Object 



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# File 'lib/fire_and_forget/command/fire.rb', line 19

def binary
  @task.binary
end

#binary_file ⇒ Object 



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# File 'lib/fire_and_forget/command/fire.rb', line 23

def binary_file
  @task.binary.split(" ").first
end

#cmd ⇒ Object 



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# File 'lib/fire_and_forget/command/fire.rb', line 27

def cmd
  %(#{binary} #{FireAndForget.to_arguments(@params)})
end

#env ⇒ Object 



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# File 'lib/fire_and_forget/command/fire.rb', line 45

def env
  @task.env.merge({
    FireAndForget::ENV_SOCKET => FireAndForget.socket,
    FireAndForget::ENV_TASK_NAME => @task.name.to_s
  })
end

#exists? ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/fire_and_forget/command/fire.rb', line 40

def exists?
  raise FileNotFoundError, "'#{binary_file}'" unless File.exists?(binary_file)
  true
end

#permitted? ⇒ Boolean

Returns:

  • (Boolean)

Raises:



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# File 'lib/fire_and_forget/command/fire.rb', line 35

def permitted?
  raise PermissionsError, "'#{binary_file}' does not belong to user '#{ENV["USER"]}'" unless File.stat(binary_file).uid == task_uid
  true
end

#run ⇒ Object 



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# File 'lib/fire_and_forget/command/fire.rb', line 52

def run
  if valid?
    pid = fork do
      # set up the environment so that the task can access the F&F server
      env.each { | k, v | ENV[k] = v }
      Daemons.daemonize(:backtrace => true)
      Process.setpriority(Process::PRIO_PROCESS, 0, niceness) if niceness > 0
      # change to the UID of the originating thread if necessary
      Process::UID.change_privilege(task_uid) unless Process.euid == task_uid
      exec(cmd)
    end
    Process.detach(pid) if pid
    # don't return the PID as it's actually wrong (the daemonize call forks again so our original
    # PID is at least 1 out)
    "OK"
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fire_and_forget/command/fire.rb', line 31

def valid?
  exists? && permitted?
end