131 lines
4.3 KiB
Python
131 lines
4.3 KiB
Python
#!/usr/bin/env python
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# Copyright 2016 Canonical UK Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import os
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import subprocess
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import yaml
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import logging
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from snap_openstack.renderer import SnapFileRenderer
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LOG = logging.getLogger(__name__)
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SNAP_ENV = ['SNAP_NAME',
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'SNAP_VERSION',
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'SNAP_REVISION',
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'SNAP_ARCH',
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'SNAP_LIBRARY_PATH',
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'SNAP',
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'SNAP_DATA',
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'SNAP_COMMON',
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'SNAP_USER_DATA',
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'SNAP_USER_COMMON',
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'TMPDIR']
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def snap_env():
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'''Grab SNAP* environment variables
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@return dict of all SNAP* environment variables indexed in lower case
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'''
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_env = {}
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for key in SNAP_ENV:
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_env[key.lower()] = os.environ.get(key)
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return _env
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def ensure_dir(filepath):
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'''Ensure that the directory structure to support a give file path exists'''
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dir_name = os.path.dirname(filepath)
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if not os.path.exists(dir_name):
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LOG.info('Creating directory {}'.format(dir_name))
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os.makedirs(dir_name, 0o750)
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class OpenStackSnap():
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'''Main executor class for snap-openstack'''
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def __init__(self, config_file):
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with open(config_file, 'r') as config:
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self.configuration = yaml.load(config)
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self.snap_env = snap_env()
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def setup(self):
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'''Perform any pre-execution snap setup
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Run this method prior to use of the execute metho
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'''
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setup = self.configuration['setup']
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renderer = SnapFileRenderer()
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LOG.info(setup)
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for directory in setup['dirs']:
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dir_name = directory.format(**self.snap_env)
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LOG.info('Ensuring directory {} exists'.format(dir_name))
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if not os.path.exists(dir_name):
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LOG.info('Creating directory {}'.format(dir_name))
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os.makedirs(dir_name, 0o750)
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for template in setup['templates']:
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target = setup['templates'][template]
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target_file = target.format(**self.snap_env)
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ensure_dir(target_file)
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LOG.info('Rendering {} to {}'.format(template,
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target_file))
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with open(target_file, 'w') as tf:
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os.fchmod(tf.fileno(), 0o640)
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tf.write(renderer.render(template,
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self.snap_env))
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def execute(self, argv):
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'''Execute snap command building out configuration and log options'''
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entry_point = self.configuration['entry_points'].get(argv[1])
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if not entry_point:
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_msg = 'Enable to find entry point for {}'.format(argv[1])
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LOG.error(_msg)
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raise ValueError(_msg)
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other_args = argv[:2]
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LOG.info(entry_point)
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# Build out command to run
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cmd = [entry_point['binary']]
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for cfile in entry_point.get('config-files', []):
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cfile = cfile.format(**self.snap_env)
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if os.path.exists(cfile):
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cmd.append('--config-file={}'.format(cfile))
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else:
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LOG.warning('Configuration file {} not found'
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', skipping'.format(cfile))
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for cdir in entry_point.get('config-dirs', []):
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cdir = cdir.format(**self.snap_env)
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if os.path.exists(cdir):
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cmd.append('--config-dir={}'.format(cdir))
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else:
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LOG.warning('Configuration directory {} not found'
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', skipping'.format(cdir))
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log_file = entry_point.get('log-file')
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if log_file:
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log_file = log_file.format(**self.snap_env)
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cmd.append('--log-file={}'.format(log_file))
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# Ensure any arguments passed to wrapper are propagated
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cmd.extend(other_args)
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subprocess.check_call(cmd)
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