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/usr/bin/calendarserver_upgrade is in calendarserver 5.2+dfsg-1.

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#! /usr/bin/python

##
# Copyright (c) 2006-2014 Apple Inc. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
##

import sys

#PYTHONPATH

if __name__ == "__main__":
    if "PYTHONPATH" in globals():
        sys.path.insert(0, PYTHONPATH)
    else:
        try:
            import _calendarserver_preamble
        except ImportError:
            sys.exc_clear()

    from calendarserver.tools.upgrade import main
    main()