139 lines
4.7 KiB
Python
139 lines
4.7 KiB
Python
# Copyright 2013 Hewlett-Packard Development Company, L.P.
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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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from __future__ import print_function
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import argparse
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import collections
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import logging
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import os
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import sys
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import diskimage_builder.logging_config
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logger = logging.getLogger(__name__)
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def get_elements_dir():
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if not os.environ.get('ELEMENTS_PATH'):
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raise Exception("$ELEMENTS_PATH must be set.")
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return os.environ['ELEMENTS_PATH']
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def _get_set(element, fname, elements_dir=None):
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if elements_dir is None:
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elements_dir = get_elements_dir()
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for path in elements_dir.split(':'):
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element_deps_path = (os.path.join(path, element, fname))
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try:
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with open(element_deps_path) as element_deps:
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return set([line.strip() for line in element_deps])
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except IOError as e:
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if os.path.exists(os.path.join(path, element)) and e.errno == 2:
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return set()
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if e.errno == 2:
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continue
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else:
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raise
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logger.error("Element '%s' not found in '%s'" % (element, elements_dir))
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sys.exit(-1)
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def provides(element, elements_dir=None):
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"""Return the set of elements provided by the specified element.
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:param element: name of a single element
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:param elements_dir: the elements dir to read from. If not supplied,
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inferred by calling get_elements_dir().
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:return: a set just containing all elements that the specified element
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provides.
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"""
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return _get_set(element, 'element-provides', elements_dir)
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def dependencies(element, elements_dir=None):
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"""Return the non-transitive set of dependencies for a single element.
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:param element: name of a single element
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:param elements_dir: the elements dir to read from. If not supplied,
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inferred by calling get_elements_dir().
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:return: a set just containing all elements that the specified element
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depends on.
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"""
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return _get_set(element, 'element-deps', elements_dir)
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def expand_dependencies(user_elements, elements_dir=None):
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"""Expand user requested elements using element-deps files.
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Arguments:
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:param user_elements: iterable enumerating the elements a user requested
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:param elements_dir: the elements dir to read from. Passed directly to
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dependencies()
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:return: a set containing user_elements and all dependent elements
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including any transitive dependencies.
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"""
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final_elements = set(user_elements)
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check_queue = collections.deque(user_elements)
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provided = set()
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while check_queue:
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# bug #1303911 - run through the provided elements first to avoid
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# adding unwanted dependencies and looking for virtual elements
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element = check_queue.popleft()
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if element in provided:
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continue
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deps = dependencies(element, elements_dir)
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provided.update(provides(element, elements_dir))
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check_queue.extend(deps - (final_elements | provided))
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final_elements.update(deps)
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if "operating-system" not in provided:
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logger.error(
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"Please include an operating system element.")
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sys.exit(-1)
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conflicts = set(user_elements) & provided
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if conflicts:
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logger.error("Following elements were explicitly required "
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"but are provided by other included elements: %s" %
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", ".join(conflicts))
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sys.exit(-1)
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return final_elements - provided
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def main(argv):
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diskimage_builder.logging_config.setup()
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parser = argparse.ArgumentParser()
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parser.add_argument('elements', nargs='+',
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help='display dependencies of the given elements')
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parser.add_argument('--expand-dependencies', '-d', action='store_true',
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default=False,
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help=('(DEPRECATED) print expanded dependencies '
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'of all args'))
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args = parser.parse_args(argv[1:])
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if args.expand_dependencies:
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logger.warning("expand-dependencies flag is deprecated, "
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"and is now on by default.", file=sys.stderr)
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print(' '.join(expand_dependencies(args.elements)))
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return 0
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