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relup(5)


NAME

   relup - Release upgrade file

DESCRIPTION

   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.

     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(5). 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.

SEE ALSO

   app(5), appup(5), rel(5), release_handler(3erl), systools(3erl)



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