[erlang-questions] Erlang release names and versions

Sam Bobroff <>
Wed Sep 21 06:32:15 CEST 2011


Thanks a lot for the tips but I already knew most of it -- I must
admit that I was attempting to provoke a more "official" answer from
one of the OTP people ;-)

Does anyone from the OTP team wish to comment on my original question?

All I can get so far is: the provided code and documentation is either
wrong or doesn't work so you have to build your own, although some
other people have started doing that.

That's a pretty poor official answer for how to release Erlang
applications, especially when it is strongly tied to code reloading
(one of Erlang's "killer features"... if only anyone could understand
how to use it).

Thanks,
Sam.

On 13 September 2011 21:43, Samuel Elliott <> wrote:
> Did you see this? It may have answers to some of your questions
> http://learnyousomeerlang.com/relups
> (including if you need to move generated files)
>
> Sam
>
> On Tue, Sep 13, 2011 at 6:17 AM, Sam Bobroff <> wrote:
>>
>> Hi Erlangers,
>> I'm trying to package up some Erlang projects for distribution,
>> possibly by creating Releases, and I'm getting quite confused. I'd
>> like to do it the "correct" way because we may want to use
>> release_handler to perform upgrades.
>>
>> Maybe someone can help me out :-)
>>
>> The documentation for Releases
>> (http://www.erlang.org/doc/design_principles/release_structure.html)
>> shows a sample directory structure produced by make_tar, which
>> includes this part:
>>
>> releases/A/start.boot
>> releases/ch_rel-1.rel
>>
>> Where ch_rel-1 is the name of the release and A is the version of the
>> release.
>>
>> Question 1: If the release file is placed in releases/ch_rel-1.rel,
>> then isn't installing a second version of the release (say, "B") going
>> to overwrite the file? Isn't this a problem? Is the addition of "-1"
>> to the release name supposed to address this? Shouldn't the release
>> name appear somewhere in the path?
>>
>> Question 2: If another release, say "foo", is installed with the same
>> version (say "A"), isn't it going to overwrite the start.boot file
>> from release "ch_rel-1"?
>>
>> Question 3: Should I even be trying to install more than one release
>> at once? Would I need a completely new Erlang install directory (or at
>> least, releases directory, by using RELDIR)?
>>
>> (I have, incidentally, seen somewhere that the placement of the .rel
>> file directly under releases/ by make_tar is a bug. Is this so? It
>> certainly doesn't seem to match the structure created by
>> create_target.)
>>
>> Thanks in advance for any help,
>> Sam.
>> _______________________________________________
>> erlang-questions mailing list
>> 
>> http://erlang.org/mailman/listinfo/erlang-questions
>
>
>
> --
> Samuel Elliott
> 
> http://lenary.co.uk/
> +44 (0)7891 993 664
>
>



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