#!/usr/local/bin/python2.7

# Copyright (c) 2002-2007 Sebastian Stark
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR SEBASTIAN STARK
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR
# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.


"""Distributed command execution

Usage: tentakel [ options ] [ command ]
 -c file        Use file as config file
 -g group       Select group     
 -l		Print list of available groups
 -h             Display this help text
 -v		Display version information
 command        Remote command. Interactive mode if not specified

See tentakel(1) for more information
"""

import lekatnet.error as error
import lekatnet.config as config
import lekatnet.remote as remote
import lekatnet.shell as shell
import os
import sys
import getopt

if __name__ == "__main__":

	tentakelVersion = "tentakel-2.2.1"
	destinations = None
	groupName = "default"
	flag_listgroups = 0
	override_config = ""

	try:
		opts, args = getopt.getopt(sys.argv[1:], "g:hlvc:")
	except getopt.GetoptError:
		error.err("parameter error")
	for o, v in opts:
		if o == "-g":
			groupName = v
		if o == "-c":
			override_config = v
		if o == "-h":
			print __doc__
			sys.exit(0)
		if o == "-l":
			flag_listgroups = 1
		if o == "-v":
			print tentakelVersion
			sys.exit(0)
	command = ' '.join(args)

	# check wether the user has chosen a specific configuration file
	# on the command line
	if override_config:
		if os.path.isfile(override_config):
			configfile = override_config
			found_config = True
		else:
			error.err("no such file: '%s'" % override_config)
	else:
	# look for configuration files from default locations
		configs = [	os.path.join(config._user_dir, 'tentakel.conf'),
				'/etc/tentakel.conf']
		found_config = False
		for c in configs:
			if os.path.isfile(c):
				configfile = c
				found_config = True
				break

	if not found_config: error.err("no configuration file found")

	# load configuration
	conf = config.ConfigBase()
	f = open(configfile)
	conf.load(f)
	f.close()

	# process -g parameter
	if flag_listgroups:
		print "available groups:"
		for g in conf.getGroups():
			sys.stdout.write(g + " ")
		print
		sys.exit(0)
	
	# batch mode: execute command
	if command:
		if sys.stdin.isatty():
			stdin = ''
		else:
			stdin = sys.stdin.read()
			sys.stdin.close()
		dests = remote.RemoteCollator(conf, groupName, stdin)
		dests.execAll(command)
		dests.displayAll()
	else:
	# interactive mode: open shell
		sh = shell.tentakelShell(conf, groupName)
		sh.cmdloop(intro="interactive mode")
