267 lines
10 KiB
Python
267 lines
10 KiB
Python
# kas - setup tool for bitbake based projects
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#
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# Copyright (c) Siemens AG, 2017-2018
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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"""
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This module implements how includes of configuration files are handled in
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kas.
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"""
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import os
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from collections import OrderedDict, Mapping
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import functools
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import logging
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from jsonschema.validators import Draft4Validator
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from . import __file_version__, __compatible_file_version__
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from . import CONFIGSCHEMA
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__license__ = 'MIT'
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__copyright__ = 'Copyright (c) Siemens AG, 2017-2018'
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class LoadConfigException(Exception):
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"""
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Class for exceptions that appear while loading a configuration file.
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"""
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def __init__(self, message, filename):
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super().__init__('{}: {}'.format(message, filename))
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def load_config(filename):
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"""
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Load the configuration file and test if version is supported.
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"""
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(_, ext) = os.path.splitext(filename)
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config = None
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if ext == '.json':
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import json
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with open(filename, 'rb') as fds:
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config = json.load(fds)
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elif ext == '.yml':
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import yaml
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with open(filename, 'rb') as fds:
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config = yaml.safe_load(fds)
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else:
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raise LoadConfigException('Config file extension not recognized',
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filename)
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validator = Draft4Validator(CONFIGSCHEMA)
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validation_error = False
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for error in validator.iter_errors(config):
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validation_error = True
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logging.error('Config file validation Error:\n%s', error)
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if validation_error:
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raise LoadConfigException('Error(s) occured while validating the '
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'config file', filename)
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try:
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version_value = int(config['header']['version'])
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except ValueError:
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# Be compatible: version string '0.10' is equivalent to file version 1
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# This check is already done in the config schema so here just set the
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# right version
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version_value = 1
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if version_value < __compatible_file_version__ or \
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version_value > __file_version__:
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raise LoadConfigException('This version of kas is compatible with '
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'version {} to {}, file has version {}'
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.format(__compatible_file_version__,
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__file_version__, version_value),
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filename)
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return config
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class IncludeException(Exception):
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"""
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Class for exceptions that appear in the include mechanism.
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"""
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pass
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class IncludeHandler:
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"""
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Implements a handler where every configuration file should
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contain a dictionary as the base type with and 'includes'
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key containing a list of includes.
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The includes can be specified in two ways: as a string
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containing the relative path from the current file or as a
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dictionary. The dictionary should have a 'file' key containing
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the relative path to the include file and optionally a 'repo'
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key containing the key of the repository. If the 'repo' key is
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missing the value of the 'file' key, it is treated the same as if
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just a string was defined, meaning the path is relative to the
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current config file. Otherwise it is interpreted relative to
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the repository path.
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The includes are read and merged from the deepest level upwards.
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"""
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def __init__(self, top_files):
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self.top_files = top_files
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def get_config(self, repos=None):
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"""
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Parameters:
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repos -- A dictionary that maps repo names to directory paths
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Returns:
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(config, repos)
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config -- A dictionary containing the configuration
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repos -- A list of missing repo names that are needed \
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to create a complete configuration
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"""
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repos = repos or {}
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def _internal_include_handler(filename):
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"""
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Recursively loads include files and finds missing repos.
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Includes are done in the following way:
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topfile.yml:
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-------
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header:
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includes:
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- include1.yml
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- file: include2.yml
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- repo: repo1
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file: include-repo1.yml
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- repo: repo2
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file: include-repo2.yml
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- include3.yml
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-------
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Includes are merged in in this order:
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['include1.yml', 'include2.yml', 'include-repo1.yml',
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'include-repo2.yml', 'include-repo2.yml', 'topfile.yml']
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On conflict the latter includes overwrite previous ones and
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the current file overwrites every include. (evaluation depth first
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and from top to bottom)
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"""
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# pylint: disable=too-many-arguments
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missing_repos = []
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configs = []
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current_config = load_config(filename)
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if not isinstance(current_config, Mapping):
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raise IncludeException('Configuration file does not contain a '
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'dictionary as base type')
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header = current_config.get('header', {})
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for include in header.get('includes', []):
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if isinstance(include, str):
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includefile = ''
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if include.startswith(os.path.pathsep):
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includefile = include
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else:
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includefile = os.path.abspath(
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os.path.join(
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os.path.dirname(filename),
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include))
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(cfg, rep) = _internal_include_handler(includefile)
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configs.extend(cfg)
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missing_repos.extend(rep)
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elif isinstance(include, Mapping):
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includerepo = include.get('repo', None)
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if includerepo is not None:
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includedir = repos.get(includerepo, None)
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else:
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raise IncludeException(
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'"repo" is not specified: {}'
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.format(include))
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if includedir is not None:
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try:
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includefile = include['file']
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except KeyError:
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raise IncludeException(
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'"file" is not specified: {}'
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.format(include))
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(cfg, rep) = _internal_include_handler(
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os.path.abspath(
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os.path.join(
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includedir,
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includefile)))
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configs.extend(cfg)
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missing_repos.extend(rep)
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else:
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missing_repos.append(includerepo)
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configs.append((filename, current_config))
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# Remove all possible duplicates in missing_repos
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missing_repos = list(OrderedDict.fromkeys(missing_repos))
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return (configs, missing_repos)
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def _internal_dict_merge(dest, upd, recursive_merge=True):
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"""
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Merges upd recursively into a copy of dest as OrderedDict
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If recursive_merge is False, it will use the classic dict.update,
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otherwise it will fall back on a manual merge (helpful for non-dict
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types like FunctionWrapper)
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"""
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if (not isinstance(dest, Mapping)) \
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or (not isinstance(upd, Mapping)):
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raise IncludeException('Cannot merge using non-dict')
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dest = OrderedDict(dest)
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updkeys = list(upd.keys())
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if not set(list(dest.keys())) & set(updkeys):
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recursive_merge = False
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if recursive_merge:
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for key in updkeys:
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val = upd[key]
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try:
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dest_subkey = dest.get(key, None)
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except AttributeError:
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dest_subkey = None
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if isinstance(dest_subkey, Mapping) \
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and isinstance(val, Mapping):
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ret = _internal_dict_merge(dest_subkey, val)
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dest[key] = ret
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else:
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dest[key] = upd[key]
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return dest
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try:
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for k in upd:
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dest[k] = upd[k]
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except AttributeError:
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# this mapping is not a dict
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for k in upd:
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dest[k] = upd[k]
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return dest
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configs = []
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missing_repos = []
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for configfile in self.top_files:
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cfgs, reps = _internal_include_handler(configfile)
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configs.extend(cfgs)
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missing_repos.extend(reps)
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config = functools.reduce(_internal_dict_merge,
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map(lambda x: x[1], configs))
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return config, missing_repos
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