Class: Chef::RunLock

Inherits:
Object
  • Object
show all
Defined in:
lib/chef/undev/monkey_patches/run_lock.rb

Instance Method Summary collapse

Instance Method Details

#acquire ⇒ Object 



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# File 'lib/chef/undev/monkey_patches/run_lock.rb', line 3

def acquire
  # ensure the runlock_file path exists
  create_path(File.dirname(runlock_file))
  @runlock = File.open(runlock_file,'w+')
  unless runlock.flock(File::LOCK_EX|File::LOCK_NB)
    # Another chef client running...
    runpid = runlock.read.strip.chomp
    Chef::Log.warn("Chef client #{runpid} is running, will wait for it to finish and then run.")
    runlock.flock(File::LOCK_EX)
  end
  # We grabbed the run lock.  Save the pid.
  runlock.truncate(0)
  runlock.rewind # truncate doesn't reset position to 0.
  runlock.write(Process.pid.to_s)
end