604926b38f
An element can define a list of elements provided by itself. This allows using an alternative element and keeping element dependencies at the same time. This will be needed for example for mariadb element which will be an alternative to mysql element - mysql dependency can be kept everywhere but user can choose mariadb explicitly as a replacement by putting "mysql" into "element-provides" file. Change-Id: I7f193612f279dd71d9f1f1edfc60009838a00c5a
124 lines
4.2 KiB
Python
124 lines
4.2 KiB
Python
# Copyright 2013 Hewlett-Packard Development Company, L.P.
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# All Rights Reserved.
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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 argparse
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import os
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import sys
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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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sys.stderr.write("ERROR: Element '%s' not found in '%s'\n" %
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(element, elements_dir))
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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 = list(user_elements)
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provided = set()
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while check_queue:
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element = check_queue.pop()
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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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conflicts = set(user_elements) & provided
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if conflicts:
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sys.stderr.write("ERROR: Following elements were explicitly required "
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"but are provided by other included elements: %s\n" %
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", ".join(conflicts))
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exit(-1)
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return final_elements - provided
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def main(argv):
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parser = argparse.ArgumentParser()
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parser.add_argument('elements', nargs='+',
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help='elements to inspect')
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parser.add_argument('--expand-dependencies', '-d', action='store_true',
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default=False,
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help='Print expanded dependencies 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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print(' '.join(expand_dependencies(args.elements)))
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return 0
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sys.stderr.write("ERROR: please choose an option.\n")
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return -1
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