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# Copyright (C) 2012-2013 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 copy
import re
import morphlib
from morphlib.util import OrderedDict, json
class Morphology(object):
'''An in-memory representation of a morphology.
This is a parsed version of the morphology, with rules for default
values applied. No other processing.
'''
static_defaults = {
'chunk': [
('description', ''),
('configure-commands', None),
('build-commands', None),
('test-commands', None),
('install-commands', None),
('chunks', []),
('max-jobs', None),
('build-system', 'manual')
],
'stratum': [
('chunks', []),
('description', ''),
('build-depends', None)
],
'system': [
('strata', []),
('description', ''),
('arch', None),
('system-kind', None),
('configuration-extensions', []),
]
}
@staticmethod
def _load_json(text):
return json.loads(text, object_pairs_hook=OrderedDict)
@staticmethod
def _dump_json(obj, f):
text = json.dumps(obj, indent=4)
text = re.sub(" \n", "\n", text)
f.write(text)
f.write('\n')
def __init__(self, text):
# Load as JSON first, then try YAML, so morphologies
# that read as JSON are dumped as JSON, likewise with YAML.
try:
self._dict = self._load_json(text)
self._dumper = self._dump_json
except Exception, e: # pragma: no cover
self._dict = morphlib.yamlparse.load(text)
self._dumper = morphlib.yamlparse.dump
self._set_defaults()
self._validate_children()
def __getitem__(self, key):
return self._dict[key]
def __contains__(self, key):
return key in self._dict
def keys(self):
return self._dict.keys()
def _validate_children(self):
if self['kind'] == 'system':
names = set()
for info in self['strata']:
name = info.get('alias', info['morph'])
if name in names:
raise ValueError('Duplicate stratum "%s"' % name)
names.add(name)
elif self['kind'] == 'stratum':
names = set()
for info in self['chunks']:
name = info.get('alias', info['name'])
if name in names:
raise ValueError('Duplicate chunk "%s"' % name)
names.add(name)
def lookup_child_by_name(self, name):
'''Find child reference by its name.
This lookup honors aliases.
'''
if self['kind'] == 'system':
for info in self['strata']:
source_name = info.get('alias', info['morph'])
if source_name == name:
return info
elif self['kind'] == 'stratum':
for info in self['chunks']:
source_name = info.get('alias', info['morph'])
if source_name == name:
return info
raise KeyError('"%s" not found' % name)
def _set_defaults(self):
if 'max-jobs' in self:
self._dict['max-jobs'] = int(self['max-jobs'])
if 'disk-size' in self:
size = self['disk-size']
self._dict['_disk-size'] = size
self._dict['disk-size'] = self._parse_size(size)
for name, value in self.static_defaults[self['kind']]:
if name not in self._dict:
self._dict[name] = value
if self['kind'] == 'stratum':
self._set_stratum_defaults()
def _set_stratum_defaults(self):
for source in self['chunks']:
if 'repo' not in source:
source['repo'] = source['name']
if 'morph' not in source:
source['morph'] = source['name']
if 'build-depends' not in source:
source['build-depends'] = None
def _parse_size(self, size):
if isinstance(size, basestring):
size = size.lower()
if size.endswith('g'):
return int(size[:-1]) * 1024 ** 3
elif size.endswith('m'): # pragma: no cover
return int(size[:-1]) * 1024 ** 2
elif size.endswith('k'): # pragma: no cover
return int(size[:-1]) * 1024
return int(size) # pragma: no cover
def write_to_file(self, f): # pragma: no cover
# Recreate dict without the empty default values, with a few kind
# specific hacks to try and edit standard morphologies as
# non-destructively as possible
as_dict = OrderedDict()
for key in self.keys():
if self['kind'] == 'stratum' and key == 'chunks':
value = copy.copy(self[key])
for chunk in value:
if chunk["morph"] == chunk["name"]:
del chunk["morph"]
if self['kind'] == 'system' and key == 'disk-size':
# Use human-readable value (assumes we never programmatically
# change this value within morph)
value = self['_disk-size']
else:
value = self[key]
if value and key[0] != '_':
as_dict[key] = value
self._dumper(as_dict, f)
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