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Current File : //lib/python2.7/site-packages/cloudinit/cmd/status.py
# Copyright (C) 2017 Canonical Ltd.
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Define 'status' utility and handler as part of cloud-init commandline."""

import argparse
import os
import sys
from time import gmtime, strftime, sleep

from cloudinit.distros import uses_systemd
from cloudinit.stages import Init
from cloudinit.util import get_cmdline, load_file, load_json

CLOUDINIT_DISABLED_FILE = '/etc/cloud/cloud-init.disabled'

# customer visible status messages
STATUS_ENABLED_NOT_RUN = 'not run'
STATUS_RUNNING = 'running'
STATUS_DONE = 'done'
STATUS_ERROR = 'error'
STATUS_DISABLED = 'disabled'


def get_parser(parser=None):
    """Build or extend an arg parser for status utility.

    @param parser: Optional existing ArgumentParser instance representing the
        status subcommand which will be extended to support the args of
        this utility.

    @returns: ArgumentParser with proper argument configuration.
    """
    if not parser:
        parser = argparse.ArgumentParser(
            prog='status',
            description='Report run status of cloud init')
    parser.add_argument(
        '-l', '--long', action='store_true', default=False,
        help=('Report long format of statuses including run stage name and'
              ' error messages'))
    parser.add_argument(
        '-w', '--wait', action='store_true', default=False,
        help='Block waiting on cloud-init to complete')
    return parser


def handle_status_args(name, args):
    """Handle calls to 'cloud-init status' as a subcommand."""
    # Read configured paths
    init = Init(ds_deps=[])
    init.read_cfg()

    status, status_detail, time = _get_status_details(init.paths)
    if args.wait:
        while status in (STATUS_ENABLED_NOT_RUN, STATUS_RUNNING):
            sys.stdout.write('.')
            sys.stdout.flush()
            status, status_detail, time = _get_status_details(init.paths)
            sleep(0.25)
        sys.stdout.write('\n')
    if args.long:
        print('status: {0}'.format(status))
        if time:
            print('time: {0}'.format(time))
        print('detail:\n{0}'.format(status_detail))
    else:
        print('status: {0}'.format(status))
    return 1 if status == STATUS_ERROR else 0


def _is_cloudinit_disabled(disable_file, paths):
    """Report whether cloud-init is disabled.

    @param disable_file: The path to the cloud-init disable file.
    @param paths: An initialized cloudinit.helpers.Paths object.
    @returns: A tuple containing (bool, reason) about cloud-init's status and
    why.
    """
    is_disabled = False
    cmdline_parts = get_cmdline().split()
    if not uses_systemd():
        reason = 'Cloud-init enabled on sysvinit'
    elif 'cloud-init=enabled' in cmdline_parts:
        reason = 'Cloud-init enabled by kernel command line cloud-init=enabled'
    elif os.path.exists(disable_file):
        is_disabled = True
        reason = 'Cloud-init disabled by {0}'.format(disable_file)
    elif 'cloud-init=disabled' in cmdline_parts:
        is_disabled = True
        reason = 'Cloud-init disabled by kernel parameter cloud-init=disabled'
    elif not os.path.exists(os.path.join(paths.run_dir, 'enabled')):
        is_disabled = True
        reason = 'Cloud-init disabled by cloud-init-generator'
    else:
        reason = 'Cloud-init enabled by systemd cloud-init-generator'
    return (is_disabled, reason)


def _get_status_details(paths):
    """Return a 3-tuple of status, status_details and time of last event.

    @param paths: An initialized cloudinit.helpers.paths object.

    Values are obtained from parsing paths.run_dir/status.json.
    """
    status = STATUS_ENABLED_NOT_RUN
    status_detail = ''
    status_v1 = {}

    status_file = os.path.join(paths.run_dir, 'status.json')
    result_file = os.path.join(paths.run_dir, 'result.json')

    (is_disabled, reason) = _is_cloudinit_disabled(
        CLOUDINIT_DISABLED_FILE, paths)
    if is_disabled:
        status = STATUS_DISABLED
        status_detail = reason
    if os.path.exists(status_file):
        if not os.path.exists(result_file):
            status = STATUS_RUNNING
        status_v1 = load_json(load_file(status_file)).get('v1', {})
    errors = []
    latest_event = 0
    for key, value in sorted(status_v1.items()):
        if key == 'stage':
            if value:
                status = STATUS_RUNNING
                status_detail = 'Running in stage: {0}'.format(value)
        elif key == 'datasource':
            status_detail = value
        elif isinstance(value, dict):
            errors.extend(value.get('errors', []))
            start = value.get('start') or 0
            finished = value.get('finished') or 0
            if finished == 0 and start != 0:
                status = STATUS_RUNNING
            event_time = max(start, finished)
            if event_time > latest_event:
                latest_event = event_time
    if errors:
        status = STATUS_ERROR
        status_detail = '\n'.join(errors)
    elif status == STATUS_ENABLED_NOT_RUN and latest_event > 0:
        status = STATUS_DONE
    if latest_event:
        time = strftime('%a, %d %b %Y %H:%M:%S %z', gmtime(latest_event))
    else:
        time = ''
    return status, status_detail, time


def main():
    """Tool to report status of cloud-init."""
    parser = get_parser()
    sys.exit(handle_status_args('status', parser.parse_args()))


if __name__ == '__main__':
    main()

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