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require 'puppet'
require 'puppet/util/pidlock'
require 'puppet/external/event-loop'
# A module that handles operations common to all daemons. This is included
# into the Server and Client base classes.
class Puppet::Daemon
attr_accessor :agent, :server, :argv
def daemonname
Puppet[:name]
end
# Put the daemon into the background.
def daemonize
if pid = fork()
Process.detach(pid)
exit(0)
end
create_pidfile()
# Get rid of console logging
Puppet::Util::Log.close(:console)
Process.setsid
Dir.chdir("/")
begin
$stdin.reopen "/dev/null"
$stdout.reopen "/dev/null", "a"
$stderr.reopen $stdout
Puppet::Util::Log.reopen
rescue => detail
File.open("/tmp/daemonout", "w") { |f|
f.puts "Could not start %s: %s" % [Puppet[:name], detail]
}
Puppet.err "Could not start %s: %s" % [Puppet[:name], detail]
exit(12)
end
end
# Create a pidfile for our daemon, so we can be stopped and others
# don't try to start.
def create_pidfile
Puppet::Util.sync(Puppet[:name]).synchronize(Sync::EX) do
unless Puppet::Util::Pidlock.new(pidfile).lock
raise "Could not create PID file: %s" % [pidfile]
end
end
end
# Provide the path to our pidfile.
def pidfile
Puppet[:pidfile]
end
def reexec
raise Puppet::DevError, "Cannot reexec unless ARGV arguments are set" unless argv
command = $0 + " " + argv.join(" ")
Puppet.notice "Restarting with '%s'" % command
stop(:exit => false)
exec(command)
end
def reload
return unless agent
if agent.running?
Puppet.notice "Not triggering already-running agent"
return
end
agent.run
end
# Remove the pid file for our daemon.
def remove_pidfile
Puppet::Util.sync(Puppet[:name]).synchronize(Sync::EX) do
locker = Puppet::Util::Pidlock.new(pidfile)
if locker.locked?
locker.unlock or Puppet.err "Could not remove PID file %s" % [pidfile]
end
end
end
def restart
if agent and agent.running?
agent.configure_delayed_restart
else
reexec
end
end
def reopen_logs
Puppet::Util::Log.reopen
end
# Trap a couple of the main signals. This should probably be handled
# in a way that anyone else can register callbacks for traps, but, eh.
def set_signal_traps
{:INT => :stop, :TERM => :stop, :HUP => :restart, :USR1 => :reload, :USR2 => :reopen_logs}.each do |signal, method|
trap(signal) do
Puppet.notice "Caught #{signal}; calling #{method}"
send(method)
end
end
end
# Stop everything
def stop(args = {:exit => true})
server.stop if server
agent.stop if agent
remove_pidfile()
Puppet::Util::Log.close_all
exit if args[:exit]
end
def start
set_signal_traps
create_pidfile
raise Puppet::DevError, "Daemons must have an agent, server, or both" unless agent or server
agent.start if agent
server.start if server
EventLoop.current.run
end
end
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