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# Copyright 2017 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/>.
"""
VyOS version data access library.
VyOS stores its version data, which include the version number and some
additional information in a JSON file. This module provides a convenient
interface to reading it.
Example of the version data dict::
{
'built_by': 'autobuild@vyos.net',
'build_id': '021ac2ee-cd07-448b-9991-9c68d878cddd',
'version': '1.2.0-rolling+201806200337',
'built_on': 'Wed 20 Jun 2018 03:37 UTC'
}
"""
import os
import json
import vyos.defaults
version_file = os.path.join(vyos.defaults.directories['data'], 'version.json')
def get_version_data(file=version_file):
"""
Get complete version data
Args:
file (str): path to the version file
Returns:
dict: version data, if it can not be found and empty dict
The optional ``file`` argument comes in handy in upgrade scripts
that need to retrieve information from images other than the running image.
It should not be used on a running system since the location of that file
is an implementation detail and may change in the future, while the interface
of this module will stay the same.
"""
try:
with open(file, 'r') as f:
version_data = json.load(f)
return version_data
except FileNotFoundError:
return {}
def get_version(file=None):
"""
Get the version number, or an empty string if it could not be determined
"""
version_data = None
if file:
version_data = get_version_data(file=file)
else:
version_data = get_version_data()
return version_data.get('version','')

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