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require_relative '../../puppet/util/pidlock'
require_relative '../../puppet/error'
# 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.puppet.com/agent_lockfiles
module Puppet::Agent::Locker
# Yield if we get a lock, else raise Puppet::LockError. Return
# value of block yielded.
def lock
if lockfile.lock
begin
yield
ensure
lockfile.unlock
end
else
fail Puppet::LockError, _('Failed to acquire lock')
end
end
def running?
lockfile.locked?
end
def lockfile_path
@lockfile_path ||= Puppet[:agent_catalog_run_lockfile]
end
def lockfile
@lockfile ||= Puppet::Util::Pidlock.new(lockfile_path)
@lockfile
end
private :lockfile
end
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