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2013
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.
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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 should be located in
the OTP_ROOT/erts-EVsn/Vsn directory.
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() is the current version of the release.
-
UpFromVsn = string() is an earlier version of the release
to upgrade from.
-
Descr = term() is a user defined parameter passed
from the systools:make_relup/3,4 function. It will
be used in the return value of
release_handler:install_release/1,2.
-
Instructions is 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.
-
DownToVsn = string() is an earlier version of the release
to downgrade to.
When upgrading from UpFromVsn with
release_handler:install_release/1,2, there does not have to be
an exact match of versions, but UpFromVsn can be a sub-string
of the current release version.
SEE ALSO
app(4), appup(4), rel(4), release_handler(3), systools(3)