On Fri, Jul 18, 2014 at 2:40 PM, Michael DeHaan <[email protected]> wrote:

There are cases (again, parameterized roles) - different roles can have the
> same dependency with different parameters, where that doesn't make sense.)
>
​AFAIU, this is exactly the use case for allow_duplicates=yes, isn’t it? It
would allow the role to be executed multiple times to accommodate the
different parameters. What doesn’t make sense here?

On the other hand, currently, setting allow_duplicates=no does not help
parameterized roles, nor does it help the *execute at most once* use case.​
It allows multiple executions if the role is listed explicitly and is also
a dependency.

it sounds like some people may like a role metadata parameter that is
> different from this, that is not allow_duplicates, that is something like
> once_per_play or something.
>
​What I’m after is not once_per_play, it’s absolutely once, no matter how
many times the role is listed in top-level or included plays, and no matter
how many times it’s pulled in as a dependency.​

If we forget about dependencies for a bit, and consider the case where a
role is listed in two plays, which are both included in a top-level role.
Should that role be executed multiple times even when allow_duplicates=no?
​

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