cloudify/scripts/create.py

#!/usr/bin/env python

import subprocess
from cloudify import ctx
from cloudify.exceptions import OperationRetry


def check_command(command):

    try:
        process = subprocess.Popen(
            command.split()
        )
    except OSError:
        return False

    output, error = process.communicate()

    ctx.logger.debug('command: {0} '.format(command))
    ctx.logger.debug('output: {0} '.format(output))
    ctx.logger.debug('error: {0} '.format(error))
    ctx.logger.debug('process.returncode: {0} '.format(process.returncode))

    if process.returncode:
        ctx.logger.error('Running `{0}` returns error.'.format(command))
        return False

    return True


def execute_command(_command):

    ctx.logger.debug('_command {0}.'.format(_command))

    subprocess_args = {
        'args': _command.split(),
        'stdout': subprocess.PIPE,
        'stderr': subprocess.PIPE
    }

    ctx.logger.debug('subprocess_args {0}.'.format(subprocess_args))

    process = subprocess.Popen(**subprocess_args)
    output, error = process.communicate()

    ctx.logger.debug('command: {0} '.format(_command))
    ctx.logger.debug('output: {0} '.format(output))
    ctx.logger.debug('error: {0} '.format(error))
    ctx.logger.debug('process.returncode: {0} '.format(process.returncode))

    if process.returncode:
        ctx.logger.error('Running `{0}` returns error.'.format(_command))
        return False

    return output


if __name__ == '__main__':

    docker_command = 'docker ps'

    if not check_command(docker_command):
        raise OperationRetry('Waiting for docker to be installed.')

    finished = False
    ps = execute_command('ps -ef')
    for line in ps.split('\n'):
        if '/usr/bin/python /usr/bin/cloud-init modules' in line:
            ctx.logger.error('in line')
            raise OperationRetry('Waiting for Cloud Init to finish.')

    ctx.logger.info('Docker is ready and Cloud Init finished.')