[Buildroot] [RFC] Allow packages to create users

[Buildroot] [RFC] Allow packages to create users

[Yann E. MORIN]

Hello All!

Recently, I've had the need for a package to create a user to
run its daemon as:
    http://lists.busybox.net/pipermail/buildroot/2012-December/064044.html

The solution was ugly and very specific to this package, so it was
(rightfully!) refused, until there is a generic way for packages to
create users.

I now have a prototype that is working in simple cases:
    https://gitorious.org/buildroot/buildroot/commits/yem-package-create-user

(The commit titled 'package/foo: new package to test adding users' is a
dummy, temporary commit, it will be removed before a pull-request is made).

The documentation for this new feature is available at:
    http://ymorin.is-a-geek.org/download/tmp/br/manual/manual.html#generic-package-reference

The new variable is FOO_USERS, with its syntax defined here:
    http://ymorin.is-a-geek.org/download/tmp/br/manual/manual.html#makeuser-syntax

I'd appreciate comments, especially on the syntax.

Regards,
Yann E. MORIN.

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