# vi: ts=4 expandtab
#
#    Copyright (C) 2012 Canonical Ltd.
#    Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#    Copyright (C) 2012 Yahoo! Inc.
#
#    Author: Scott Moser <scott.moser@canonical.com>
#    Author: Juerg Haefliger <juerg.haefliger@hp.com>
#    Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

import os

from cloudinit import handlers
from cloudinit import log as logging
from cloudinit import util

from cloudinit.settings import (PER_ALWAYS)

LOG = logging.getLogger(__name__)
BOOTHOOK_PREFIX = "#cloud-boothook"


class BootHookPartHandler(handlers.Handler):
    def __init__(self, paths, datasource, **_kwargs):
        handlers.Handler.__init__(self, PER_ALWAYS)
        self.boothook_dir = paths.get_ipath("boothooks")
        self.instance_id = None
        if datasource:
            self.instance_id = datasource.get_instance_id()

    def list_types(self):
        return [
            handlers.type_from_starts_with(BOOTHOOK_PREFIX),
        ]

    def _write_part(self, payload, filename):
        filename = util.clean_filename(filename)
        filepath = os.path.join(self.boothook_dir, filename)
        contents = util.dos2unix(payload)
        if contents.startswith(BOOTHOOK_PREFIX):
            real_start = len(BOOTHOOK_PREFIX) + 1
            contents = contents[real_start:]
        util.write_file(filepath, contents, 0700)
        return filepath

    def handle_part(self, _data, ctype, filename,  # pylint: disable=W0221
                    payload, frequency):  # pylint: disable=W0613
        if ctype in handlers.CONTENT_SIGNALS:
            return

        filepath = self._write_part(payload, filename)
        try:
            env = os.environ.copy()
            if self.instance_id is not None:
                env['INSTANCE_ID'] = str(self.instance_id)
            util.subp([filepath], env=env)
        except util.ProcessExecutionError:
            util.logexc(LOG, "Boothooks script %s execution error", filepath)
        except Exception:
            util.logexc(LOG, "Boothooks unknown error when running %s",
                        filepath)