[Buildroot] integrating MariaDB Galera Cluster into BR

[Yann E. MORIN <yann.morin.1998@free.fr>]

Sylvain, All,

On 2015-04-24 16:49 +0200, Sylvain Raybaud spake thusly:
> I would like to integrate MariaDB Galera Cluster
> (https://mariadb.com/kb/en/mariadb/what-is-mariadb-galera-cluster/)
> into Buildroot. Before I prepare and submit patches I would like to
> ask a few questions about how to do things properly: MariaDB conflicts
> with MySQL (they install the same files). Should I:
> 
>  a) Create a meta-package, for example "mysql compatible DB", the
> selection of which would let the user choose between MariaDB Galera
> Cluster or MySQL?
> 
>  b) Integrate MariaDB Galera Cluster into MySQL package and let the
> user choose which implementation he wants?
> 
>  c) Make these packages mutually exclusive using "depends on !"?

I would say either b) or c). Which one depends on how MariaDB Galera is
seen with respect to MySQL:

 1- is it a completely different implementation that is 100% compatible?

 2- is it a fork that is 100% compatible?

 3- is it a fork that is not 100% compatible?

For 1 or 2, I'd say go with b), otherwise go for c).

If you decide for c), then only one can depend on not the ther
(otherwise you'd have a crcular dependency). That is, something like:

    config BR2_PKG_MYSQL
        bool "mysql"

    config BR2_PKG_MARIADB
        bool "mariadb"
        depends on !BR2_PKG_MYSQL

Anyway, if you're not sure, go for c); we will review the patch, and we
can guide you based on the details.

in any case, be sure to read:

  - the section(s) from the "Adding new packages to Buildroot" chapter,
    that applies to mariadb (e.g. generic, autotools, cmake...):
    http://buildroot.net/downloads/manual/manual.html#adding-packages

  - the section on how to send patches:
    http://buildroot.net/downloads/manual/manual.html#submitting-patches

Happy hacking! ;-)

Regards,
Yann E. MORIN.

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