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2016
Ericsson AB, 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,
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The Initial Developer of the Original Code is Ericsson AB.
relup
relup
Release upgrade file
The release upgrade file describes how a release is
upgraded in a running system.
This file is automatically generated by
systools:make_relup/3,4,
using a release resource file
(.rel), application resource files (.app), and
application upgrade files (.appup) as input.
File Syntax
In a target system, the release upgrade file is to be located in
directory $ROOT/releases/Vsn.
The relup file contains one single Erlang term, which
defines the instructions used to upgrade the release. The file has
the following syntax:
{Vsn,
[{UpFromVsn, Descr, Instructions}, ...],
[{DownToVsn, Descr, Instructions}, ...]}.
Vsn = string()
Current release version.
Earlier version of the release to upgrade from.
A user-defined parameter passed
from the function
systools:make_relup/3,4.
It is used in the return value of
release_handler:install_release/1,2.
A list of low-level release upgrade instructions, see
appup(4).
It consists of the release upgrade instructions from
the respective application upgrade files (high-level instructions
are translated to low-level instructions), in the same order
as in the start script.
Earlier version of the release to downgrade to.
app(4),
appup(4),
rel(4),
release_handler(3),
systools(3)