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#!/usr/bin/python
#
# 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 morphlib
import cliapp
class MorphologyFactoryError(cliapp.AppException):
pass
class AutodetectError(MorphologyFactoryError):
def __init__(self, repo_name, ref):
MorphologyFactoryError.__init__(self,
"Failed to determine the build system of repo %s at "
"ref %s" % (repo_name, ref))
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):
'''An way of creating morphologies which will provide a default'''
def __init__(self, local_repo_cache, remote_repo_cache=None):
self._lrc = local_repo_cache
self._rrc = remote_repo_cache
def get_morphology(self, reponame, sha1, filename):
try:
text = self._cat_text(reponame, sha1, filename)
except:
text = self._autodetect_text(reponame, sha1, filename)
return morphlib.morph2.Morphology(text)
def _cat_text(self, reponame, sha1, filename):
if self._lrc.has_repo(reponame):
repo = self._lrc.get_repo(reponame)
return repo.cat(sha1, filename)
elif self._rrc is not None:
return self._rrc.cat_file(reponame, sha1, filename)
else:
raise NotcachedError(reponame)
def _autodetect_text(self, reponame, sha1, filename):
if self._lrc.has_repo(reponame):
repo = self._lrc.get_repo(reponame)
files = repo.list_files(sha1)
elif self._rrc is not None:
files = self._rrc.list_files(reponame, sha1)
else:
raise NotcachedError(reponame)
bs = morphlib.buildsystem.detect_build_system(lambda x: x in files)
if bs is None:
raise AutodetectError(reponame, sha1)
# TODO consider changing how morphs are located to be by morph
# name rather than filename, it would save creating a
# filename only to strip it back to its morph name again
# and would allow future changes like morphologies being
# stored as git metadata instead of as a file in the repo
assert filename.endswith('.morph')
morph_name = filename[:-len('.morph')]
morph_text = bs.get_morphology_text(morph_name)
return morph_text
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