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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
class MutualDependencyError(cliapp.AppException):
def __init__(self, a, b):
cliapp.AppException.__init__(
self, 'Cyclic dependency between %s and %s detected' % (a, b))
class CyclicDependencyChainError(cliapp.AppException):
def __init__(self):
cliapp.AppException.__init__(
self, 'Cyclic dependency chain detected')
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, 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, chunk))
class DependencyResolver(object):
def resolve_dependencies(self, source_pool):
queue = collections.deque(source_pool)
while queue:
source = queue.popleft()
if source.morphology['kind'] == 'system':
self._resolve_system_dependencies(source, queue, source_pool)
elif source.morphology['kind'] == 'stratum':
self._resolve_stratum_dependencies(source, queue, source_pool)
self._detect_cyclic_dependencies(source_pool)
def _resolve_system_dependencies(self, system, queue, source_pool):
for stratum_name in system.morphology['strata']:
stratum = source_pool.lookup(
system.repo,
system.original_ref,
'%s.morph' % stratum_name)
system.add_dependency(stratum)
queue.append(stratum)
def _resolve_stratum_dependencies(self, stratum, queue, source_pool):
strata = []
if stratum.morphology['build-depends']:
for stratum_name in stratum.morphology['build-depends']:
other_stratum = source_pool.lookup(
stratum.repo,
stratum.original_ref,
'%s.morph' % stratum_name)
strata.append(other_stratum)
if other_stratum.depends_on(stratum):
raise MutualDependencyError(stratum, other_stratum)
stratum.add_dependency(other_stratum)
queue.append(other_stratum)
chunks = []
processed_chunks = []
name_to_processed_chunk = {}
for info in stratum.morphology['sources']:
chunk = source_pool.lookup(
info['repo'],
info['ref'],
'%s.morph' % info['morph'])
chunks.append(chunk)
stratum.add_dependency(chunk)
for other_stratum in strata:
chunk.add_dependency(other_stratum)
build_depends = info.get('build-depends', None)
if build_depends is None:
for earlier_chunk in processed_chunks:
if earlier_chunk is chunk:
continue
if earlier_chunk.depends_on(chunk):
raise MutualDependencyError(chunk, earlier_chunk)
chunk.add_dependency(earlier_chunk)
elif isinstance(build_depends, list):
for name in build_depends:
other_chunk = name_to_processed_chunk.get(name, None)
if other_chunk is chunk:
continue
if other_chunk:
chunk.add_dependency(other_chunk)
else:
raise DependencyOrderError(stratum, info['name'], name)
else:
raise DependencyFormatError(stratum, info['name'])
processed_chunks.append(chunk)
name_to_processed_chunk[info['name']] = chunk
def _detect_cyclic_dependencies(self, source_pool):
# FIXME This is not well tested and might be incorrect. Better
# something based on
# http://stackoverflow.com/questions/546655/finding-all-cycles-in-graph
visited = set()
explored = set()
parent = {}
roots = []
for source in source_pool:
if len(source.dependents) == 0:
roots.append(source)
parent[source] = None
stack = collections.deque(roots)
while stack:
source = stack.popleft()
visited.add(source)
for dependency in source.dependencies:
if not (source, dependency) in explored:
explored.add((source, dependency))
parent[dependency] = source
if not dependency in visited:
stack.appendleft(dependency)
else:
raise CyclicDependencyChainError()
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