Synnefo

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from optparse import make_option

from django.core.management.base import CommandError

from snf_django.management.commands import SynnefoCommand

from synnefo.db.models import Backend

from snf_django.management.utils import parse_bool

from synnefo.management import common

HYPERVISORS = [h[0] for h in Backend.HYPERVISORS]

class Command(SynnefoCommand):

    output_transaction = True

    args = "<backend ID>"

    help = "Modify a backend"

    option_list = SynnefoCommand.option_list + (

        make_option('--clustername',

                    dest='clustername',

                    help="Set backend's clustername"),

        make_option('--port',

                    dest='port',

                    help="Set backend's port"),

        make_option('--username',

                    dest='username',

                    help="Set backend'username"),

        make_option('--password',

                    dest='password',

                    help="Set backend's password"),

        make_option('--drained',

                    dest='drained',

                    choices=["True", "False"],

                    metavar="True|False",

                    help="Set the backend as drained to exclude from"

                         " allocation operations"),

        make_option('--hypervisor',

                    dest='hypervisor',

                    default=None,

                    choices=HYPERVISORS,

                    metavar="|".join(HYPERVISORS),

                    help="The hypervisor that the Ganeti backend uses"),

        make_option('--offline',

                    dest='offline',

                    choices=["True", "False"],

                    metavar="True|False",

                    help="Set the backend as offline to not communicate in"

                         " order to avoid delays"),

    )

    def handle(self, *args, **options):

        if len(args) != 1:

            raise CommandError("Please provide a backend ID")

        backend = common.get_resource("backend", args[0], for_update=True)

        # Ensure fields correspondence with options and Backend model

        credentials_changed = False

        fields = ('clustername', 'port', 'username', 'password')

        for field in fields:

            value = options.get(field)

            if value is not None:

                backend.__setattr__(field, value)

                credentials_changed = True

        if credentials_changed:

                # check credentials, if any of them changed!

                common.check_backend_credentials(backend.clustername,

                                                 backend.port,

                                                 backend.username,

                                                 backend.password)

        if options['drained']:

            backend.drained = parse_bool(options['drained'], strict=True)

        if options['offline']:

            backend.offline = parse_bool(options['offline'], strict=True)

        hypervisor = options["hypervisor"]

        if hypervisor:

            backend.hypervisor = hypervisor

        backend.save()