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# Copyright (C) 2012-2014 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 morphlib
import cliapp
class MorphologyFactoryError(cliapp.AppException):
pass
class MorphologyNotFoundError(MorphologyFactoryError):
def __init__(self, filename):
MorphologyFactoryError.__init__(
self, "Couldn't find morphology: %s" % filename)
class NotcachedError(MorphologyFactoryError):
def __init__(self, repo_name):
MorphologyFactoryError.__init__(
self, "Repository %s is not cached locally and there is no "
"remote cache specified" % repo_name)
class MorphologyFactory(object):
'''A way of creating morphologies which will provide a default'''
def __init__(self, local_repo_cache, remote_repo_cache=None,
status_cb=None):
self._lrc = local_repo_cache
self._rrc = remote_repo_cache
null_status_function = lambda **kwargs: None
self.status = status_cb or null_status_function
def get_morphology(self, reponame, sha1, filename):
morph_name = os.path.splitext(os.path.basename(filename))[0]
loader = morphlib.morphloader.MorphologyLoader()
if self._lrc.has_repo(reponame):
self.status(msg="Looking for %s in local repo cache" % filename,
chatty=True)
try:
repo = self._lrc.get_repo(reponame)
morph = loader.load_from_string(repo.cat(sha1, filename))
except IOError:
morph = None
file_list = repo.ls_tree(sha1)
elif self._rrc is not None:
self.status(msg="Retrieving %(reponame)s %(sha1)s %(filename)s"
" from the remote git cache.",
reponame=reponame, sha1=sha1, filename=filename,
chatty=True)
try:
text = self._rrc.cat_file(reponame, sha1, filename)
morph = loader.load_from_string(text)
except morphlib.remoterepocache.CatFileError:
morph = None
file_list = self._rrc.ls_tree(reponame, sha1)
else:
raise NotcachedError(reponame)
if morph is None:
self.status(msg="File %s doesn't exist: attempting to infer "
"chunk morph from repo's build system"
% filename, chatty=True)
bs = morphlib.buildsystem.detect_build_system(file_list)
if bs is None:
raise MorphologyNotFoundError(filename)
morph = bs.get_morphology(morph_name)
loader.validate(morph)
loader.set_commands(morph)
loader.set_defaults(morph)
return morph
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