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# Copyright (C) 2011 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; either 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 json
import logging
import os
import StringIO
import urlparse
import morphlib
class NoMorphs(Exception):
def __init__(self, repo, ref):
Exception.__init__(self,
'Cannot find any morpologies at %s:%s' %
(repo, ref))
class TooManyMorphs(Exception):
def __init__(self, repo, ref, morphs):
Exception.__init__(self,
'Too many morphologies at %s:%s: %s' %
(repo, ref, ', '.join(morphs)))
class Builder(object):
'''Build binary objects for Baserock.
The objects may be chunks or strata.'''
def __init__(self, tempdir, msg, settings):
self.tempdir = tempdir
self.msg = msg
self.settings = settings
self.cachedir = morphlib.cachedir.CacheDir(settings['cachedir'])
@property
def arch(self):
return os.uname()[4]
def build(self, morph):
'''Build a binary based on a morphology.'''
if morph.kind == 'chunk':
self.build_chunk(morph, self.settings['chunk-repo'],
self.settings['chunk-ref'])
elif morph.kind == 'stratum':
self.build_stratum(morph)
else:
raise Exception('Unknown kind of morphology: %s' % morph.kind)
def build_chunk(self, morph, repo, ref):
'''Build a chunk from a morphology.'''
logging.debug('Building chunk')
self.msg('Building chunk %s' % morph.name)
filename = self.get_cached_name('chunk', repo, ref)
if os.path.exists(filename):
self.msg('Chunk already exists: %s %s' % (repo, ref))
else:
self.ex = morphlib.execute.Execute(self._build, self.msg)
self.ex.env['WORKAREA'] = self.tempdir.dirname
self.ex.env['DESTDIR'] = self._inst + '/'
self.create_build_tree(morph, repo, ref)
self.ex.run(morph.configure_commands)
self.ex.run(morph.build_commands)
self.ex.run(morph.test_commands)
os.mkdir(self._inst)
self.ex.run(morph.install_commands, as_root=True)
self.prepare_binary_metadata(morph,
repo=repo,
ref=self.get_git_commit_id(repo, ref))
self.create_chunk(morph, repo, ref)
self.tempdir.clear()
def create_build_tree(self, morph, repo, ref):
'''Export sources from git into the ``self._build`` directory.'''
logging.debug('Creating build tree at %s' % self._build)
os.mkdir(self._build)
tarball = self.tempdir.join('sources.tar')
self.ex.runv(['git', 'archive',
'--output', tarball,
'--remote', repo,
ref])
self.ex.runv(['tar', '-C', self._build, '-xf', tarball])
os.remove(tarball)
def create_chunk(self, morph, repo, ref):
'''Create a Baserock chunk from the ``self._inst`` directory.
The directory must be filled in with all the relevant files already.
'''
filename = self.get_cached_name('chunk', repo, ref)
logging.debug('Creating chunk %s at %s' % (morph.name, filename))
self.ex.runv(['tar', '-C', self._inst, '-czf', filename, '.'])
def build_stratum(self, morph):
'''Build a stratum from a morphology.'''
for chunk_name, source in morph.sources.iteritems():
repo = source['repo']
ref = source['ref']
chunk_morph = self.get_morph_from_git(repo, ref)
self.build_chunk(chunk_morph, repo, ref)
os.mkdir(self._inst)
self.ex = morphlib.execute.Execute(self.tempdir.dirname, self.msg)
for chunk_name in morph.sources:
source = morph.sources[chunk_name]
chunk_repo = source['repo']
chunk_ref = source['ref']
logging.debug('Looking for chunk at repo=%s ref=%s' %
(chunk_repo, chunk_ref))
filename = self.get_cached_name('chunk', chunk_repo, chunk_ref)
self.unpack_chunk(filename)
self.prepare_binary_metadata(morph)
self.create_stratum(morph)
self.tempdir.clear()
def unpack_chunk(self, filename):
self.ex.runv(['tar', '-C', self._inst, '-xf', filename])
def create_stratum(self, morph):
'''Create a Baserock stratum from the ``self._inst`` directory.
The directory must be filled in with all the relevant files already.
'''
# FIXME: Should put in stratum's git repo and reference here.
filename = self.get_cached_name('stratum', '', '')
if os.path.exists(filename):
self.msg('Stratum already exists: %s' % morph.name)
else:
logging.debug('Creating stratum %s at %s' % (morph.name, filename))
self.ex.runv(['tar', '-C', self._inst, '-czf', filename, '.'])
@property
def _build(self):
return self.tempdir.join('build')
@property
def _inst(self):
return self.tempdir.join('inst')
def get_cached_name(self, kind, repo, ref):
'''Return the cached name of a binary blob, if and when it exists.'''
abs_ref = self.get_git_commit_id(repo, ref)
dict_key = {
'kind': kind,
'arch': self.arch,
'repo': repo,
'ref': abs_ref,
}
return self.cachedir.name(dict_key)
def get_git_commit_id(self, repo, ref):
'''Return the full SHA-1 commit id for a repo+ref.'''
if repo and ref:
path = self.get_repo_dir(repo)
ex = morphlib.execute.Execute(path, self.msg)
out = ex.runv(['git', 'rev-list', '-n1', ref])
return out.strip()
else:
return ''
def get_morph_from_git(self, repo, ref):
'''Return a morphology from a git repository.'''
# FIXME: This implementation assume a local repo.
path = self.get_repo_dir(repo)
ex = morphlib.execute.Execute(path, self.msg)
out = ex.runv(['git', 'ls-tree', '--name-only', '-z', ref])
names = [x for x in out.split('\0') if x]
morphs = [x for x in names if x.endswith('.morph')]
if len(morphs) == 0:
raise NoMorphs(repo, ref)
if len(morphs) > 1:
raise TooManyMorphs(repo, ref, morphs)
out = ex.runv(['git', 'cat-file', 'blob', '%s:%s' % (ref, morphs[0])])
f = StringIO.StringIO(out)
f.name = morphs[0]
morph = morphlib.morphology.Morphology(f,
self.settings['git-base-url'])
return morph
def get_repo_dir(self, repo):
scheme, netlock, path, params, query, frag = urlparse.urlparse(repo)
return path
def prepare_binary_metadata(self, morph, **kwargs):
'''Add metadata to a binary about to be built.'''
meta = {
'name': morph.name,
'kind': morph.kind,
}
for key, value in kwargs.iteritems():
meta[key] = value
dirname = os.path.join(self._inst, 'baserock')
filename = os.path.join(dirname, '%s.meta' % morph.name)
if not os.path.exists(dirname):
os.mkdir(dirname)
with open(filename, 'w') as f:
json.dump(meta, f, indent=4)
f.write('\n')
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