"""
Exececute custom commands during unwind/cleanup
"""
import logging
import contextlib

from teuthology import misc as teuthology
from teuthology import contextutil

log = logging.getLogger(__name__)

@contextlib.contextmanager
def task(ctx, config):
    """
    Execute commands on a given role

        tasks:
        - ceph:
        - kclient: [client.a]
        - exec:
            client.a:
              - "echo 'module libceph +p' > /sys/kernel/debug/dynamic_debug/control"
              - "echo 'module ceph +p' > /sys/kernel/debug/dynamic_debug/control"
        - interactive:

    It stops and fails with the first command that does not return on success. It means
    that if the first command fails, the second won't run at all.

    To avoid confusion it is recommended to explicitly enclose the commands in 
    double quotes. For instance if the command is false (without double quotes) it will
    be interpreted as a boolean by the YAML parser.

    :param ctx: Context
    :param config: Configuration
    """
    try:
        yield
    finally:
        log.info('Executing custom commands...')
        assert isinstance(config, dict), "task exec got invalid config"

        testdir = teuthology.get_testdir(ctx)

        if 'all' in config and len(config) == 1:
            a = config['all']
            roles = teuthology.all_roles(ctx.cluster)
            config = dict((id_, a) for id_ in roles)

            for role, ls in config.iteritems():
                (remote,) = ctx.cluster.only(role).remotes.iterkeys()
                log.info('Running commands on role %s host %s', role, remote.name)
                for c in ls:
                    c.replace('$TESTDIR', testdir)
                    remote.run(
                        args=[
                            'sudo',
                            'TESTDIR={tdir}'.format(tdir=testdir),
                            'bash',
                            '-c',
                            c],
                    )