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#!/usr/bin/python3

## live-build(7) - Live System Build Components
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## Copyright (C) 2006-2014 Daniel Baumann <mail@daniel-baumann.ch>
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##
## This program comes with ABSOLUTELY NO WARRANTY; for details see COPYING.
## This is free software, and you are welcome to redistribute it
## under certain conditions; see COPYING for details.


import argparse
import configparser
import glob
import os
import shutil
import subprocess
import sys
import urllib.request


# TODO:
#   * logfile output
#   * lockfile handling
#   * use gettext for i18n

def main():
	## Parsing Arguments
	arguments = argparse.ArgumentParser(
		prog            = 'lb init',
		usage           = '%(prog)s [arguments]',
		description     = '''live-build contains the components to build a live system from a configuration directory.
		                     The init command creates an empty configuration directory or reinitialize an existing one.''',
		epilog          = 'See \'man lb-init\' for more information.',
		formatter_class = argparse.ArgumentDefaultsHelpFormatter
	)

	arguments.add_argument('--version',      help='show program\'s version number and exit', action='version', version='live-build 4')
	arguments.add_argument('--verbose',      help='set verbose option',                      action='store_true')

	arguments.add_argument('--distribution', help='set default distribution')
	arguments.add_argument('--project',      help='set project defaults')

	args = arguments.parse_args()

	# --verbose
	verbose = args.verbose

	# --distribution
	distribution = args.distribution

	# --project
	project = args.project

	## Setting defaults

	if not project:
		# FIXME: hardcoded project information
		project = 'debian'

	if not distribution:
		# FIXME hardcoded release information
		default_distribution = { 'debian' :         'wheezy',
					 'progress-linux' : 'baureo',
		}

		distribution = default_distribution[project]

	## Creating configuration directory

	# stagefile
	if os.path.isdir('.build'):
		if verbose:
			print('I: configuration directory already initialized - nothing to do')

		# Notes:
		#   * until further tests, we do not allow to re-run lb init on an already initialized directory.
		sys.exit(0)

	# Print warning about live-build development version
	print('WARNING: THIS VERSION OF LIVE-BUILD IS EXPERIMENTAL\n')

	print('IT IS UNFINISHED AND CHANGES HEAVILY WITHOUT PRIOR NOTICE.')
	print('USER DISCRETION IS ADVISED.\n')

	print('Please also note that you are running a live-build development version')
	print('and that we are only supporting the newest development version.\n')

	print('Make sure you are using the newest version at all times.')

	# Configuring default archive-keys
	if (project == 'progress-linux'):
		# dependencies
		if not os.path.isfile('/usr/bin/gpgv'):
			print('E: /usr/bin/gpgv - no such file', file=sys.stderr)

			if verbose:
				print('I: gnupg can be obtained from:\n'
				      'I:   http://www.gnupg.org/\n'
				      'I: On Debian based systems, gnupg can be installed with:\n'
				      'I:   # sudo apt-get install gnupg')

			sys.exit(1)

		os.makedirs('config/archives', exist_ok=True)

		# FIXME hardcoded release information
		archive_keys_url = 'http://cdn.archive.progress-linux.org/packages/project/keys/'

		archive_keys = { 'artax' :            [ 'archive-key-1-artax.asc'  , 'archive-key-1+-artax-backports.asc'  ],
				 'artax-backports' :  [ 'archive-key-1-artax.asc'  , 'archive-key-1+-artax-backports.asc'  ],
				 'baureo' :           [ 'archive-key-2-baureo.asc' , 'archive-key-2+-baureo-backports.asc' ],
				 'baureo-backports' : [ 'archive-key-2-baureo.asc' , 'archive-key-2+-baureo-backports.asc' ],
				 'cairon' :           [ 'archive-key-3-cairon.asc' , 'archive-key-3+-cairon-backports.asc' ],
				 'cairon-backports' : [ 'archive-key-3-cairon.asc' , 'archive-key-3+-cairon-backports.asc' ],
		}

		keys = archive_keys[distribution]

		for key in keys:
			url = archive_keys_url + key
			target = os.path.splitext(os.path.basename(key))

			if verbose:
				print('I: Downloading ' + url)

			r = urllib.request.urlopen(url)
			f = open('config/archives/' + target[0] + '.key', 'w')

			f.write(r.read())

		# FIXME: download signatures and verify them against debian-keyring

	# Configuring default hooks
	os.makedirs('config/hooks', exist_ok=True)

	for hook in glob.glob('/usr/share/live/build/hooks/*.hook*'):
		os.symlink(hook, os.path.join('config/hooks/' + os.path.basename(hook)))

	# Configuring default includes
	os.makedirs('config/includes', exist_ok=True)
	os.makedirs('config/includes.bootstrap', exist_ok=True)
	os.makedirs('config/includes.chroot', exist_ok=True)
	os.makedirs('config/includes.binary', exist_ok=True)
	os.makedirs('config/includes.source', exist_ok=True)

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	# Ensure correct include directory permissions avoiding tainting of target system
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	os.chmod('config/includes', 0o755)
	os.chmod('config/includes.bootstrap', 0o755)
	os.chmod('config/includes.chroot', 0o755)
	os.chmod('config/includes.binary', 0o755)
	os.chmod('config/includes.source', 0o755)
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	# Configuring default package lists
	os.makedirs('config/package-lists', exist_ok=True)

	f = open('config/package-lists/live.list.chroot', 'w')
	f.write('live-boot\nlive-config\nlive-config-sysvinit\n')
	f.close()

	## stagefile
	os.makedirs('.build', exist_ok=True)


if __name__ == '__main__':
	main()