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# Copyright 2019 VyOS maintainers and contributors <maintainers@vyos.io>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library. If not, see <http://www.gnu.org/licenses/>.
import os
import re
import sys
import json
import vyos.defaults
def get_system_versions():
"""
Get component versions from running system: read vyatta directory
structure for versions, then read vyos JSON file. It is a critical
error if either migration directory or JSON file is unreadable.
"""
system_versions = {}
try:
version_info = os.listdir(vyos.defaults.directories['current'])
except OSError as err:
print("OS error: {}".format(err))
sys.exit(1)
for info in version_info:
if re.match(r'[\w,-]+@\d+', info):
pair = info.split('@')
system_versions[pair[0]] = int(pair[1])
version_dict = {}
path = vyos.defaults.version_file
if os.path.isfile(path):
with open(path, 'r') as f:
try:
version_dict = json.load(f)
except ValueError as err:
print(f"\nValue error in {path}: {err}")
sys.exit(1)
for k, v in version_dict.items():
if not isinstance(v, int):
print(f"\nType error in {path}; expecting Dict[str, int]")
sys.exit(1)
existing = system_versions.get(k)
if existing is None:
system_versions[k] = v
elif v > existing:
system_versions[k] = v
return system_versions
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