ftl/common/layer_builder.py

# Copyright 2017 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import datetime
import logging

from ftl.common import constants
from ftl.common import ftl_util
from ftl.common import single_layer_image
from ftl.common import tar_to_dockerimage


class AppLayerBuilder(single_layer_image.BaseLayerBuilder):
    def __init__(self,
                 directory,
                 destination_path=constants.DEFAULT_DESTINATION_PATH,
                 entrypoint=constants.DEFAULT_ENTRYPOINT,
                 exposed_ports=None):
        self._directory = directory
        self._destination_path = destination_path
        self._entrypoint = entrypoint
        self._exposed_ports = exposed_ports

    def GetCacheKeyRaw(self):
        return None

    def BuildLayer(self):
        """Override."""
        with ftl_util.Timing('Building app layer'):
            gz, tar = ftl_util.zip_dir_to_layer_sha(self._directory,
                                                    self._destination_path)

            overrides_dct = {
                'created': str(datetime.date.today()) + 'T00:00:00Z'
            }
            if self._entrypoint:
                overrides_dct['Entrypoint'] = self._entrypoint
            if self._exposed_ports:
                overrides_dct['ExposedPorts'] = self._exposed_ports
            if self._exposed_ports:
                overrides_dct['ExposedPorts'] = self._exposed_ports
            logging.info('Finished gzipping tarfile.')
            self._img = tar_to_dockerimage.FromFSImage([gz], [tar],
                                                       overrides_dct)