cdist/bin/cdist

#!/usr/bin/env python3
# -*- coding: utf-8 -*-
#
# 2010-2016 Nico Schottelius (nico-cdist at schottelius.org)
# 2016 Darko Poljak (darko.poljak at gmail.com)
#
# This file is part of cdist.
#
# cdist is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# cdist is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with cdist. If not, see <http://www.gnu.org/licenses/>.
#
#

import logging
import os
import sys

# try to import cdist and if that fails, then add this file's parent dir to
# module search path and try again. additionally check if this file is
# symlinked, so user can symlink this file to, for example, ~/.local/bin.
try:
    import cdist
except ModuleNotFoundError:
    cdist_bin = __file__
    if os.path.islink(cdist_bin):
        cdist_bin = os.readlink(cdist_bin)
    cdist_dir = os.path.abspath(os.path.join(os.path.dirname(cdist_bin), os.pardir))
    sys.path.insert(0, cdist_dir)
    import cdist

import cdist.argparse
import cdist.banner
import cdist.config
import cdist.install
import cdist.shell
import cdist.inventory


def commandline():
    """Parse command line"""

    # preos subcommand hack
    if len(sys.argv) > 1 and sys.argv[1] == 'preos':
        return cdist.preos.PreOS.commandline(sys.argv[1:])
    parser, cfg = cdist.argparse.parse_and_configure(sys.argv[1:])
    args = cfg.get_args()

    # Work around python 3.3 bug:
    # http://bugs.python.org/issue16308
    # http://bugs.python.org/issue9253

    # FIXME: catching AttributeError also hides
    # real problems.. try a different way

    # FIXME: we always print main help, not
    # the help of the actual parser being used!
    try:
        getattr(args, "func")
    except AttributeError:
        parser['main'].print_help()
        sys.exit(0)

    args.func(args)


if __name__ == "__main__":
    if sys.version < cdist.MIN_SUPPORTED_PYTHON_VERSION:
        print('Python >= {} is required on the source host.'.format(
                cdist.MIN_SUPPORTED_PYTHON_VERSIO), file=sys.stderr)
        sys.exit(1)

    exit_code = 0

    try:
        import re
        import os

        if re.match("__", os.path.basename(sys.argv[0])):
            import cdist.emulator
            emulator = cdist.emulator.Emulator(sys.argv)
            emulator.run()
        else:
            commandline()

    except KeyboardInterrupt:
        exit_code = 2

    except cdist.Error as e:
        log = logging.getLogger("cdist")
        log.error(e)
        exit_code = 1

    sys.exit(exit_code)