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# Copyright (C) 2012-2016 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, see <http://www.gnu.org/licenses/>.
import hashlib
import logging
import morphlib
class CacheKeyComputer(object):
def __init__(self, build_env):
self._build_env = build_env
self._calculated = {}
self._hashed = {}
def _filterenv(self, env):
keys = ["LOGNAME", "MORPH_ARCH", "TARGET", "TARGET_STAGE1",
"USER", "USERNAME"]
return dict([(k, env[k]) for k in keys])
def compute_key(self, source):
try:
return self._hashed[source]
except KeyError:
ret = self._hash_id(self.get_cache_id(source))
self._hashed[source] = ret
logging.debug(
'computed cache key %s for artifact %s from source ',
ret, (source.repo_name, source.sha1, source.filename))
return ret
def _hash_id(self, cache_id):
sha = hashlib.sha256()
self._hash_dict(sha, cache_id)
return sha.hexdigest()
def _hash_thing(self, sha, thing):
if type(thing) == dict:
self._hash_dict(sha, thing)
elif type(thing) == list:
self._hash_list(sha, thing)
elif type(thing) == tuple:
self._hash_tuple(sha, thing)
else:
sha.update(str(thing))
def _hash_dict(self, sha, d):
for tup in sorted(d.iteritems()):
self._hash_thing(sha, tup)
def _hash_list(self, sha, l):
for item in l:
self._hash_thing(sha, item)
def _hash_tuple(self, sha, tup):
for item in tup:
self._hash_thing(sha, item)
def get_cache_id(self, source):
try:
ret = self._calculated[source]
return ret
except KeyError:
cacheid = self._calculate(source)
self._calculated[source] = cacheid
return cacheid
def _calculate(self, source):
keys = {
'env': self._filterenv(self._build_env.env),
'kids': [{'artifact': a.name,
'cache-key': self.compute_key(a.source)}
for a in source.dependencies],
'metadata-version': 1
}
morphology = source.morphology
kind = morphology['kind']
if kind == 'chunk':
keys['build-mode'] = source.build_mode
keys['prefix'] = source.prefix
keys['tree'] = source.tree
keys['split-rules'] = [(a, [rgx.pattern for rgx in r._regexes])
for (a, r) in source.split_rules]
# Include morphology contents, since it doesn't always come
# from the source tree
keys['devices'] = morphology.get('devices')
keys['max-jobs'] = morphology.get('max-jobs')
keys['system-integration'] = morphology.get('system-integration',
{})
# products is omitted as they are part of the split-rules
# include {pre-,,post-}{configure,build,test,install}-commands
# in morphology key
for prefix in ('pre-', '', 'post-'):
for cmdtype in ('configure', 'build', 'test',
'install', 'strip'):
cmd_field = prefix + cmdtype + '-commands'
if cmd_field in morphology:
keys[cmd_field] = morphology[cmd_field]
elif kind in ('system', 'stratum'):
morph_dict = dict((k, morphology[k]) for k in morphology.keys())
# Disregard all fields of a morphology that aren't important
ignored_fields = (
'description', # purely cosmetic, doesn't change builds
# Configuration extensions don't run at build time, therefore
# they don't have to be included in the cache key.
'configuration-extensions',
# The following are used to determine dependencies,
# so are already handled by the 'kids' field.
'strata', 'build-depends', 'chunks',
'products')
for key in morph_dict:
if key not in ignored_fields:
keys[key] = morph_dict[key]
if kind == 'chunk':
keys['chunk-compatibility-version'] = 1
elif kind == 'stratum':
keys['stratum-format-version'] = 1
elif kind == 'system':
keys['system-compatibility-version'] = "2~ (upgradable, root rw)"
return keys
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