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# Copyright (C) 2012 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
import cliapp
import collections
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, 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 DependencyFormatError(cliapp.AppException):
def __init__(self, stratum, chunk):
cliapp.AppException.__init__(
self, 'In stratum %s, chunk %s uses an invalid '
'build-depends format' % (stratum.source, chunk))
class UndefinedChunkArtifactError(cliapp.AppException):
'''Exception raised when non-existent artifacts are referenced.
Usually, this will only occur when a stratum refers to a chunk
artifact that is not defined in a chunk.
'''
def __init__(self, parent, reference):
cliapp.AppException.__init__(
self, 'Undefined chunk artifact "%s" referenced in '
'stratum %s' % (reference, parent))
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._cached_artifacts = None
self._added_artifacts = None
self._source_pool = None
def resolve_artifacts(self, source_pool):
self._source_pool = source_pool
self._cached_artifacts = {}
self._added_artifacts = set()
artifacts = self._resolve_artifacts_recursively()
# TODO perform cycle detection, e.g. based on:
# http://stackoverflow.com/questions/546655/finding-all-cycles-in-graph
return artifacts
def _resolve_artifacts_recursively(self):
artifacts = []
queue = self._create_initial_queue()
while queue:
source = queue.popleft()
if source.morphology['kind'] == 'system':
systems = [self._get_artifact(source, a)
for a in source.morphology.builds_artifacts]
if any(a not in self._added_artifacts for a in systems):
artifacts.extend(systems)
self._added_artifacts.update(systems)
resolved_artifacts = self._resolve_system_dependencies(
systems, source, queue)
for artifact in resolved_artifacts:
if not artifact in self._added_artifacts:
artifacts.append(artifact)
self._added_artifacts.add(artifact)
elif source.morphology['kind'] == 'stratum':
assert len(source.morphology.builds_artifacts) == 1
artifact = self._get_artifact(
source, source.morphology.builds_artifacts[0])
if not artifact in self._added_artifacts:
artifacts.append(artifact)
self._added_artifacts.add(artifact)
resolved_artifacts = self._resolve_stratum_dependencies(
artifact, queue)
for artifact in resolved_artifacts:
if not artifact in self._added_artifacts:
artifacts.append(artifact)
self._added_artifacts.add(artifact)
elif source.morphology['kind'] == 'chunk':
names = source.morphology.builds_artifacts
for name in names:
artifact = self._get_artifact(source, name)
if not artifact in self._added_artifacts:
artifacts.append(artifact)
self._added_artifacts.add(artifact)
return artifacts
def _create_initial_queue(self):
if all([x.morphology['kind'] == 'chunk' for x in self._source_pool]):
return collections.deque(self._source_pool)
else:
sources = [x for x in self._source_pool
if x.morphology['kind'] != 'chunk']
return collections.deque(sources)
def _get_artifact(self, source, name):
info = (source, name)
if info in self._cached_artifacts:
return self._cached_artifacts[info]
else:
artifact = morphlib.artifact.Artifact(info[0], info[1])
self._cached_artifacts[info] = artifact
return artifact
def _resolve_system_dependencies(self, systems, source, queue):
artifacts = []
for stratum_name in source.morphology['strata']:
stratum_source = self._source_pool.lookup(
source.repo_name,
source.original_ref,
'%s.morph' % stratum_name)
stratum = self._get_artifact(stratum_source, stratum_name)
for system in systems:
system.add_dependency(stratum)
queue.append(stratum_source)
artifacts.append(stratum)
return artifacts
def _resolve_stratum_dependencies(self, stratum, queue):
artifacts = []
strata = []
if stratum.source.morphology['build-depends']:
for stratum_name in stratum.source.morphology['build-depends']:
other_source = self._source_pool.lookup(
stratum.source.repo_name,
stratum.source.original_ref,
'%s.morph' % stratum_name)
other_stratum = self._get_artifact(other_source, stratum_name)
strata.append(other_stratum)
artifacts.append(other_stratum)
if other_stratum.depends_on(stratum):
raise MutualDependencyError(stratum, other_stratum)
stratum.add_dependency(other_stratum)
queue.append(other_source)
chunk_artifacts = []
processed_artifacts = []
name_to_processed_artifact = {}
for info in stratum.source.morphology['sources']:
chunk_source = self._source_pool.lookup(
info['repo'],
info['ref'],
'%s.morph' % info['morph'])
possible_names = chunk_source.morphology.builds_artifacts
if not info['name'] in possible_names:
raise UndefinedChunkArtifactError(stratum.source, info['name'])
chunk_artifact = self._get_artifact(chunk_source, info['name'])
chunk_artifacts.append(chunk_artifact)
artifacts.append(chunk_artifact)
stratum.add_dependency(chunk_artifact)
for other_stratum in strata:
chunk_artifact.add_dependency(other_stratum)
build_depends = info.get('build-depends', None)
if build_depends is None:
for earlier_artifact in processed_artifacts:
if earlier_artifact is chunk_artifact:
continue
if earlier_artifact.depends_on(chunk_artifact):
raise MutualDependencyError(
chunk_artifact, earlier_artifact)
chunk_artifact.add_dependency(earlier_artifact)
elif isinstance(build_depends, list):
for name in build_depends:
other_artifact = name_to_processed_artifact.get(name, None)
if other_artifact is chunk_artifact:
continue
if other_artifact:
chunk_artifact.add_dependency(other_artifact)
else:
raise DependencyOrderError(
stratum, info['name'], name)
else:
raise DependencyFormatError(stratum, info['name'])
processed_artifacts.append(chunk_artifact)
name_to_processed_artifact[info['name']] = chunk_artifact
return artifacts
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