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# Copyright (C) 2012-2015 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program. If not, see <http://www.gnu.org/licenses/>.
import cliapp
import collections
import logging
import morphlib
class MutualDependencyError(cliapp.AppException):
def __init__(self, a, b):
cliapp.AppException.__init__(
self, 'Cyclic dependency between %s and %s detected' % (a, b))
class DependencyOrderError(cliapp.AppException):
def __init__(self, stratum_source, chunk, dependency_name):
cliapp.AppException.__init__(
self, 'In stratum %s, chunk %s references its dependency %s '
'before it is defined' %
(stratum_source, chunk, dependency_name))
class ArtifactResolver(object):
'''Resolves sources into artifacts that would be build from the sources.
This class takes a CacheKeyComputer and a SourcePool, analyses the
sources and their dependencies and creates a list of artifacts
(represented by Artifact objects) that are involved in building the
sources in the pool.
'''
def __init__(self):
self._added_artifacts = None
self._source_pool = None
def resolve_root_artifacts(self, source_pool): #pragma: no cover
return [a for a in self._resolve_artifacts(source_pool)
if not a.dependents]
def _resolve_system_artifacts(self, source, artifacts): # pragma: no cover
systems = [source.artifacts[name] for name
in source.split_rules.artifacts]
artifacts += systems
artifacts += self._resolve_system_dependencies(systems, source)
def _resolve_stratum_artifacts(self, source, artifacts):
# Iterate split_rules.artifacts, rather than
# artifacts.values() to preserve ordering
strata = [source.artifacts[name]
for name in source.split_rules.artifacts
if name in source.artifacts]
# If we were not given systems, return the strata here,
# rather than have the systems return them.
if not any(s.morphology['kind'] == 'system'
for s in self._source_pool):
for stratum in (s for s in strata
if s not in self._added_artifacts):
artifacts.append(stratum)
self._added_artifacts.add(stratum)
resolved_artifacts = self._resolve_stratum_dependencies(
strata, source)
for artifact in resolved_artifacts:
if not artifact in self._added_artifacts:
artifacts.append(artifact)
self._added_artifacts.add(artifact)
def _resolve_chunk_artifacts(self, source, artifacts):
chunks = [source.artifacts[name]
for name in source.split_rules.artifacts]
# If we were only given chunks, return them here, rather than
# have the strata return them.
if not any(s.morphology['kind'] == 'stratum'
for s in self._source_pool):
for chunk in (c for c in chunks
if c not in self._added_artifacts):
artifacts.append(chunk)
self._added_artifacts.add(chunk)
def _resolve_artifacts(self, source_pool):
self._source_pool = source_pool
self._added_artifacts = set()
artifacts = []
# TODO perform cycle detection, e.g. based on:
# http://stackoverflow.com/questions/546655/finding-all-cycles-in-graph
resolvers = {'system': self._resolve_system_artifacts,
'stratum': self._resolve_stratum_artifacts,
'chunk': self._resolve_chunk_artifacts}
for source in self._source_pool:
resolvers[source.morphology['kind']](source, artifacts)
return artifacts
def _resolve_system_dependencies(self, systems, source): # pragma: no cover
artifacts = []
for info in source.morphology['strata']:
for stratum_source in self._source_pool.lookup(
info.get('repo') or source.repo_name,
info.get('ref') or source.original_ref,
morphlib.util.sanitise_morphology_path(info['morph'])):
stratum_morph_name = stratum_source.morphology['name']
matches, overlaps, unmatched = source.split_rules.partition(
((stratum_morph_name, sta_name) for sta_name
in stratum_source.split_rules.artifacts))
for system in systems:
for (stratum_name, sta_name) in matches[system.name]:
if sta_name in stratum_source.artifacts:
stratum_artifact = \
stratum_source.artifacts[sta_name]
source.add_dependency(stratum_artifact)
artifacts.append(stratum_artifact)
return artifacts
def _resolve_stratum_dependencies(self, strata, source):
artifacts = []
stratum_build_depends = []
for stratum_info in source.morphology.get('build-depends') or []:
for other_source in self._source_pool.lookup(
stratum_info.get('repo') or source.repo_name,
stratum_info.get('ref') or source.original_ref,
morphlib.util.sanitise_morphology_path(stratum_info['morph'])):
# Make every stratum artifact this stratum source produces
# depend on every stratum artifact the other stratum source
# produces.
for sta_name in other_source.split_rules.artifacts:
# Strata have split rules for artifacts they don't build,
# since they need to know to yield a match to its sibling
if sta_name not in other_source.artifacts:
continue
other_stratum = other_source.artifacts[sta_name]
stratum_build_depends.append(other_stratum)
artifacts.append(other_stratum)
for stratum in strata:
if other_source.depends_on(stratum):
raise MutualDependencyError(stratum, other_stratum)
source.add_dependency(other_stratum)
# 'name' here is the chunk artifact name
name_to_processed_artifacts = {}
for info in source.morphology['chunks']:
filename = morphlib.util.sanitise_morphology_path(
info.get('morph', info['name']))
chunk_source = self._source_pool.lookup(
info['repo'],
info['ref'],
filename)[0]
chunk_name = chunk_source.name
# Resolve now to avoid a search for the parent morphology later
chunk_source.build_mode = info['build-mode']
chunk_source.prefix = info['prefix']
build_depends = info.get('build-depends', None)
# Add our stratum's build depends as dependencies of this chunk
for other_stratum in stratum_build_depends:
chunk_source.add_dependency(other_stratum)
# Add dependencies between chunks mentioned in this stratum
if build_depends is not None:
for name in build_depends: # pragma: no cover
if name not in name_to_processed_artifacts:
raise DependencyOrderError(
source, info['name'], name)
other_artifacts = name_to_processed_artifacts[name]
for other_artifact in other_artifacts:
chunk_source.add_dependency(other_artifact)
# Add build dependencies between our stratum's artifacts
# and the chunk artifacts produced by this stratum.
matches, overlaps, unmatched = source.split_rules.partition(
((chunk_name, ca_name) for ca_name
in chunk_source.split_rules.artifacts))
for (chunk_name, ca_name) in matches[source.name]:
chunk_artifact = chunk_source.artifacts[ca_name]
source.add_dependency(chunk_artifact)
# Only return chunks required to build strata we need
if chunk_artifact not in artifacts:
artifacts.append(chunk_artifact)
# Add these chunks to the processed artifacts, so other
# chunks may refer to them.
name_to_processed_artifacts[info['name']] = \
[chunk_source.artifacts[n] for n
in chunk_source.split_rules.artifacts]
return artifacts
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