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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 5.
Version 5 of the definitions format adds a 'strip-commands' field that can
be set in chunk definitions.
Version 5 also allows deployment extensions to live in definitions.git instead
of morph.git. This greatly reduces the interface surface of the Baserock
definitions format specification, because we no longer have to mark a new
version of the definitions format each time an extension in morph.git is added,
removed, or changes its API in any way.
In commit 6f4929946 of git://git.baserock.org/baserock/baserock/definitions.git
the deployment extensions were moved into an extensions/ subdirectory, and the
system and cluster .morph files that referred to them were all updated to
prepend 'extension/' to the filenames. This migration doesn't (re)do that
change.
'''
import sys
import warnings
import migrations
TO_VERSION = 5
def check_strip_commands(contents, filename):
assert contents['kind'] == 'chunk'
valid = True
if 'strip-commands' in contents:
warnings.warn(
"%s has strip-commands, which are not valid until version 5" %
filename)
valid = False
return valid
try:
if migrations.check_definitions_version(TO_VERSION - 1):
safe_to_migrate = migrations.process_definitions(
kinds=['chunk'], validate_cb=check_strip_commands)
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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