Module: Puppet::Agent::Locker

Included in:
Puppet::Agent
Defined in:
lib/puppet/agent/locker.rb

Overview

This module is responsible for encapsulating the logic for “locking” the puppet agent during a catalog run; in other words, keeping track of enough state to answer the question “is there a puppet agent currently applying a catalog?”

The implementation involves writing a lockfile whose contents are simply the PID of the running agent process. This is considered part of the public Puppet API because it used by external tools such as mcollective.

For more information, please see docs on the website.

http://links.puppetlabs.com/agent_lockfiles

Instance Method Summary collapse

Instance Method Details

#lock ⇒ Object

Yield if we get a lock, else do nothing. Return true/false depending on whether we get the lock.



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# File 'lib/puppet/agent/locker.rb', line 17

def lock
  if lockfile.lock
    begin
      yield
    ensure
      lockfile.unlock
    end
  end
end

#lockfile_path ⇒ Object 



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# File 'lib/puppet/agent/locker.rb', line 31

def lockfile_path
  @lockfile_path ||= Puppet[:agent_catalog_run_lockfile]
end

#running? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/puppet/agent/locker.rb', line 27

def running?
  lockfile.locked?
end