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#!/usr/bin/env python
# Copyright (C) 2015 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/>.
'''Migration to Baserock Definitions format version 2.
In version 2, the processing of the 'morph:' field within stratum .morph files
became more strict. This migration checks whether definitions are valid
according to version 2 of the format.
'''
import os
import sys
import warnings
import migrations
TO_VERSION = 2
def check_missing_chunk_morphs(contents, filename):
assert contents['kind'] == 'stratum'
valid = True
for chunk_ref in contents.get('chunks', []):
if 'morph' in chunk_ref:
chunk_path = os.path.join('.', chunk_ref['morph'])
if not os.path.exists(chunk_path):
# There's no way we can really fix this, so
# just warn and say the migration failed.
warnings.warn(
"%s points to non-existant file %s" %
(contents['name'], chunk_ref['morph']))
valid = False
return valid
try:
if migrations.check_definitions_version(TO_VERSION - 1):
safe_to_migrate = migrations.process_definitions(
kinds=['stratum'], validate_cb=check_missing_chunk_morphs)
if not safe_to_migrate:
sys.stderr.write(
"Migration failed due to one or more warnings.\n")
sys.exit(1)
else:
migrations.set_definitions_version(TO_VERSION)
sys.stdout.write("Migration completed successfully.\n")
sys.exit(0)
else:
sys.stdout.write("Nothing to do.\n")
sys.exit(0)
except RuntimeError as e:
sys.stderr.write("Error: %s\n" % e.message)
sys.exit(1)
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