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# Copyright (C) 2011-2012 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 os
import shutil
import logging
import tempfile
import morphlib
class BuildCommand(object):
'''High level logic for building.
This controls how the whole build process goes. This is a separate
class to enable easy experimentation of different approaches to
the various parts of the process.
'''
def __init__(self, app):
self.app = app
self.build_env = self.new_build_env()
self.ckc = self.new_cache_key_computer(self.build_env)
self.lac, self.rac = self.new_artifact_caches()
self.lrc, self.rrc = self.new_repo_caches()
def build(self, args):
'''Build triplets specified on command line.'''
self.app.status(msg='Build starts', chatty=True)
for repo_name, ref, filename in self.app.itertriplets(args):
self.app.status(msg='Building %(repo_name)s %(ref)s %(filename)s',
repo_name=repo_name, ref=ref, filename=filename)
order = self.compute_build_order(repo_name, ref, filename)
self.build_in_order(order)
self.app.status(msg='Build ends successfully', chatty=True)
def new_build_env(self):
'''Create a new BuildEnvironment instance.'''
return morphlib.buildenvironment.BuildEnvironment(self.app.settings)
def new_cache_key_computer(self, build_env):
'''Create a new cache key computer.'''
return morphlib.cachekeycomputer.CacheKeyComputer(build_env)
def new_artifact_caches(self):
return morphlib.util.new_artifact_caches(self.app.settings)
def create_artifact_cachedir(self):
return morphlib.util.create_artifact_cachedir(self.app.settings)
def new_repo_caches(self):
return morphlib.util.new_repo_caches(self.app)
def create_cachedir(self):
return morphlib.util.create_cachedir(self.app.settings)
def compute_build_order(self, repo_name, ref, filename):
'''Compute build order for a triplet.'''
self.app.status(msg='Figuring out the right build order')
self.app.status(msg='Creating source pool', chatty=True)
srcpool = self.app.create_source_pool(
self.lrc, self.rrc, (repo_name, ref, filename))
self.app.status(msg='Creating artifact resolver', chatty=True)
ar = morphlib.artifactresolver.ArtifactResolver()
self.app.status(msg='Resolving artifacts', chatty=True)
artifacts = ar.resolve_artifacts(srcpool)
self.app.status(msg='Computing cache keys', chatty=True)
for artifact in artifacts:
artifact.cache_key = self.ckc.compute_key(artifact)
artifact.cache_id = self.ckc.get_cache_id(artifact)
self.app.status(msg='Computing build order', chatty=True)
order = morphlib.buildorder.BuildOrder(artifacts)
return order
def build_in_order(self, order):
'''Build everything specified in a build order.'''
self.app.status(msg='Building according to build ordering',
chatty=True)
for group in order.groups:
self.build_artifacts(group)
def build_artifacts(self, artifacts):
'''Build a set of artifact.
Typically, this would be a build group, but might be anything.
At this level of abstraction we don't care.
'''
self.app.status(msg='Building a set of artifacts', chatty=True)
for artifact in artifacts:
self.build_artifact(artifact)
def build_artifact(self, artifact):
'''Build one artifact.
All the dependencies are assumed to be built and available
in either the local or remote cache already.
'''
self.app.status(msg='Checking if %(kind)s %(name)s needs building',
kind=artifact.source.morphology['kind'],
name=artifact.name)
if self.is_built(artifact):
self.app.status(msg='The %(kind)s %(name)s is already built',
kind=artifact.source.morphology['kind'],
name=artifact.name)
else:
self.app.status(msg='Building %(kind)s %(name)s',
kind=artifact.source.morphology['kind'],
name=artifact.name)
self.get_sources(artifact)
deps = self.get_recursive_deps(artifact)
self.cache_artifacts_locally(deps)
staging_area = self.create_staging_area(artifact)
if self.app.settings['staging-chroot']:
if artifact.source.morphology.needs_staging_area:
self.install_fillers(staging_area)
self.install_chunk_artifacts(staging_area,
deps)
self.build_and_cache(staging_area, artifact)
if self.app.settings['bootstrap']:
self.install_chunk_artifacts(staging_area,
(artifact,))
self.remove_staging_area(staging_area)
def is_built(self, artifact):
'''Does either cache already have the artifact?'''
return self.lac.has(artifact) or (self.rac and self.rac.has(artifact))
def get_recursive_deps(self, artifact):
done = set()
todo = set((artifact,))
while todo:
for a in todo.pop().dependencies:
if a not in done:
done.add(a)
todo.add(a)
return done
def get_sources(self, artifact):
'''Update the local git repository cache with the sources.'''
repo_name = artifact.source.repo_name
if self.app.settings['no-git-update']:
self.app.status(msg='Not updating existing git repository '
'%(repo_name)s '
'because of no-git-update being set',
chatty=True,
repo_name=repo_name)
artifact.source.repo = self.lrc.get_repo(repo_name)
return
if self.lrc.has_repo(repo_name):
artifact.source.repo = self.lrc.get_repo(repo_name)
try:
sha1 = artifact.source.sha1
artifact.source.repo.resolve_ref(sha1)
self.app.status(msg='Not updating git repository '
'%(repo_name)s because it '
'already contains sha1 %(sha1)s',
chatty=True, repo_name=repo_name,
sha1=sha1)
except morphlib.cachedrepo.InvalidReferenceError:
self.app.status(msg='Updating %(repo_name)s',
repo_name=repo_name)
artifact.source.repo.update()
else:
self.app.status(msg='Cloning %(repo_name)s',
repo_name=repo_name)
artifact.source.repo = self.lrc.cache_repo(repo_name)
# Update submodules.
done = set()
self.app.cache_repo_and_submodules(
self.lrc, artifact.source.repo.url,
artifact.source.sha1, done)
def cache_artifacts_locally(self, artifacts):
'''Get artifacts missing from local cache from remote cache.'''
def copy(remote, local):
shutil.copyfileobj(remote, local)
remote.close()
local.close()
for artifact in artifacts:
if not self.lac.has(artifact):
self.app.status(msg='Fetching to local cache: '
'artifact %(name)s',
name=artifact.name)
copy(self.rac.get(artifact), self.lac.put(artifact))
if artifact.source.morphology.needs_artifact_metadata_cached:
if not self.lac.has_artifact_metadata(artifact, 'meta'):
self.app.status(msg='Fetching to local cache: '
'artifact metadata %(name)s',
name=artifact.name)
copy(self.rac.get_artifact_metadata(artifact, 'meta'),
self.lac.put_artifact_metadata(artifact, 'meta'))
def create_staging_area(self, artifact):
'''Create the staging area for building a single artifact.'''
if self.app.settings['staging-chroot']:
staging_root = tempfile.mkdtemp(dir=self.app.settings['tempdir'])
staging_temp = staging_root
else:
staging_root = '/'
staging_temp = tempfile.mkdtemp(dir=self.app.settings['tempdir'])
self.app.status(msg='Creating staging area')
staging_area = morphlib.stagingarea.StagingArea(self.app,
staging_root,
staging_temp)
return staging_area
def remove_staging_area(self, staging_area):
'''Remove the staging area.'''
if staging_area.dirname != '/':
self.app.status(msg='Removing staging area')
staging_area.remove()
temp_path = staging_area.tempdir
if temp_path != '/' and os.path.exists(temp_path):
self.app.status(msg='Removing temporary staging directory')
shutil.rmtree(temp_path)
def install_fillers(self, staging_area):
'''Install staging fillers into the staging area.
This must not be called in bootstrap mode.
'''
logging.debug('Pre-populating staging area %s' % staging_area.dirname)
logging.debug('Fillers: %s' %
repr(self.app.settings['staging-filler']))
for filename in self.app.settings['staging-filler']:
with open(filename, 'rb') as f:
self.app.status(msg='Installing %(filename)s',
filename=filename)
staging_area.install_artifact(f)
def install_chunk_artifacts(self, staging_area, artifacts):
'''Install chunk artifacts into staging area.
We only ever care about chunk artifacts as build dependencies,
so this is not a generic artifact installer into staging area.
Any non-chunk artifacts are silently ignored.
All artifacts MUST be in the local artifact cache already.
'''
for artifact in artifacts:
if artifact.source.morphology['kind'] != 'chunk':
continue
self.app.status(msg='Installing chunk %(chunk_name)s',
chunk_name=artifact.name)
handle = self.lac.get(artifact)
staging_area.install_artifact(handle)
def build_and_cache(self, staging_area, artifact):
'''Build an artifact and put it into the local artifact cache.'''
self.app.status(msg='Starting actual build')
setup_mounts = self.app.settings['staging-chroot']
builder = morphlib.builder2.Builder(
self.app, staging_area, self.lac, self.rac, self.lrc,
self.build_env, self.app.settings['max-jobs'], setup_mounts)
return builder.build_and_cache(artifact)
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