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.
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.
UpFromVsn = string()
Earlier version of the release to upgrade from.
Descr = term()
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
.
Instructions
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()
Earlier version of the release to downgrade to.
app(4)
, appup(4)
, rel(4)
, release_handler(3)
, systools(3)
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Licensed under the Apache License, Version 2.0.