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#!/usr/bin/env python3
"""
Part of the BlackStar filesystem (bsfs) module.
A copy of the license is provided with the project.
Author: Matthias Baumgartner, 2022
"""
# imports
import argparse
import json
import logging
import sys
import typing
# bsfs imports
import bsfs
# exports
__all__: typing.Sequence[str] = (
'main',
)
## code ##
logger = logging.getLogger(__name__)
def main(argv):
"""Migrate a storage structure to a modified schema."""
parser = argparse.ArgumentParser(description=main.__doc__, prog='migrate')
parser.add_argument('--remove', action='store_true', default=False,
help='Remove classes that are not specified in the provided schema.')
parser.add_argument('config', type=str, default=None,
help='Path to the storage config file.')
parser.add_argument('schema', nargs=argparse.REMAINDER,
help='Paths to schema files. Reads from standard input if no file is supplied.')
args = parser.parse_args(argv)
# load storage config
with open(args.config, mode='rt', encoding='UTF-8') as ifile:
config = json.load(ifile)
# open bsfs storage
graph = bsfs.Open(config)
# initialize schema
schema = bsfs.schema.Schema()
if len(args.schema) == 0:
# assemble schema from standard input
schema = schema + bsfs.schema.from_string(sys.stdin.read())
else:
# assemble schema from input files
for pth in args.schema:
with open(pth, mode='rt', encoding='UTF-8') as ifile:
schema = schema + bsfs.schema.from_string(ifile.read())
# migrate schema
graph.migrate(schema, not args.remove)
# return the migrated storage
return graph
## main ##
if __name__ == '__main__':
main(sys.argv[1:])
## EOF ##
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