Marelle: prolog for devops

Hi all,

You might find interesting an extremely practical SWI-Prolog project for
configuration management, Marelle.

http://larsyencken.github.io/marelle/

At it's core, you define a handful of rules which describe a target, how to
check if it's been met, and how to meet it. For example, to install
supervisor Ubuntu 12.04:

pkg(supervisor).
met(supervisor, linux(precise)) :-
    isfile('/usr/bin/supervisorctl').
meet(supervisor, linux(precise)) :-
    bash('sudo apt-get install -y supervisor').

In your shell, running:

$ marelle meet supervisor

will install it, only if it's missing. You can compose these targets using a
depends clause, which means you can manage quite complex setups using
Marelle.

Have a play, feedback is most welcome.

Lars



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