91b431ce78
Move element-info from a wrapper script to a standard entry-point console_script. Update the documentation to explain how to run it for development. I don't think we should support the idea that you can check-out the code and run ./bin/disk-image-create -- it has dependencies (dib-utils, etc) and needs to be run from a virtualenv (this is what CI in the gate does). A follow-up can clean-up some of the path munging stuff we have for this in disk-image-create. Change-Id: Ic0c03995667f320a27ac30441279f3e6abb6bca8
238 lines
8.0 KiB
Python
238 lines
8.0 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 errno
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import logging
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import os
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import sys
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import yaml
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import diskimage_builder.logging_config
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logger = logging.getLogger(__name__)
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class Element(object):
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"""An element"""
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def __init__(self, name, path):
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"""A new element
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:param name: The element name
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:param path: Full path to element. element-deps and
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element-provides files will be parsed
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"""
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self.name = name
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self.path = path
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self.provides = set()
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self.depends = set()
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# read the provides & depends files for this element into a
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# set; if the element has them.
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provides = os.path.join(path, 'element-provides')
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depends = os.path.join(path, 'element-deps')
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try:
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with open(provides) as p:
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self.provides = set([line.strip() for line in p])
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except IOError as e:
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if e.errno == errno.ENOENT:
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pass
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else:
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raise
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try:
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with open(depends) as d:
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self.depends = set([line.strip() for line in d])
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except IOError as e:
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if e.errno == errno.ENOENT:
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pass
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else:
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raise
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logger.debug("New element : %s", str(self))
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def __str__(self):
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return '%s p:<%s> d:<%s>' % (self.name,
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','.join(self.provides),
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','.join(self.depends))
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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 expand_dependencies(user_elements, all_elements):
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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 all_elements: Element object dictionary from find_all_elements
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:return: a set containing the names of user_elements and all
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dependent elements 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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provided_by = collections.defaultdict(list)
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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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elif element not in all_elements:
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logger.error("Element '%s' not found", element)
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sys.exit(1)
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element_obj = all_elements[element]
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element_deps = element_obj.depends
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element_provides = element_obj.provides
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# save which elements provide another element for potential
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# error message
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for provide in element_provides:
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provided_by[provide].append(element)
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provided.update(element_provides)
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check_queue.extend(element_deps - (final_elements | provided))
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final_elements.update(element_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(
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"The following elements are already provided by another element")
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for element in conflicts:
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logger.error("%s : already provided by %s" %
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(element, provided_by[element]))
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sys.exit(-1)
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return final_elements - provided
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def find_all_elements(paths=None):
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"""Build a dictionary Element() objects
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Walk ELEMENTS_PATH and find all elements. Make an Element object
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for each element we wish to consider. Note we process overrides
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such that elements specified earlier in the ELEMENTS_PATH override
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those seen later.
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:param paths: A list of paths to find elements in. If None will
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use ELEMENTS_PATH
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:return: a dictionary of all elements
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"""
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all_elements = {}
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# note we process the later entries *first*, so that earlier
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# entries will override later ones. i.e. with
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# ELEMENTS_PATH=path1:path2:path3
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# we want the elements in "path1" to override "path3"
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if not paths:
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paths = reversed(get_elements_dir().split(':'))
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for path in paths:
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if not os.path.isdir(path):
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logger.error("ELEMENT_PATH entry '%s' is not a directory", path)
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sys.exit(1)
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# In words : make a list of directories in "path". Since an
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# element is a directory, this is our list of elements.
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elements = [os.path.realpath(os.path.join(path, f))
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for f in os.listdir(path)
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if os.path.isdir(os.path.join(path, f))]
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for element in elements:
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# the element name is the last part of the full path in
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# element (these are all directories, we know that from
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# above)
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name = os.path.basename(element)
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new_element = Element(name, element)
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if name in all_elements:
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logger.warning("Element <%s> overrides <%s>",
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new_element.path, all_elements[name].path)
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all_elements[name] = new_element
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return all_elements
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def main():
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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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parser.add_argument('--env', '-e', action='store_true',
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default=False,
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help=('Output eval-able bash strings for '
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'IMAGE_ELEMENT variables'))
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args = parser.parse_args(sys.argv[1:])
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all_elements = find_all_elements()
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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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elements = expand_dependencies(args.elements, all_elements)
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if args.env:
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# first the "legacy" environment variable that just lists the
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# elements
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print("export IMAGE_ELEMENT='%s'" % ' '.join(elements))
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# Then YAML
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output = {}
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for element in elements:
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output[element] = all_elements[element].path
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print("export IMAGE_ELEMENT_YAML='%s'" % yaml.safe_dump(output))
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# Then bash array. Unfortunately, bash can't export array
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# variables. So we take a compromise and produce an exported
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# function that outputs the string to re-create the array.
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# You can then simply do
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# eval declare -A element_array=$(get_image_element_array)
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# and you have it.
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output = ""
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for element in elements:
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output += '[%s]=%s ' % (element, all_elements[element].path)
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print("function get_image_element_array {\n"
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" echo \"%s\"\n"
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"};\n"
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"export -f get_image_element_array;" % output)
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else:
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print(' '.join(elements))
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return 0
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if __name__ == "__main__":
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main()
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