[PATCH] new feature: automatic services for host (v2)

[Ignacio Goyret]

Hi all,
Here is the updated patch that I promised a while back.

There are a few differences with the previous version of this patch:

- The automatic instantiation of services is now done from a function
  separate from xodtemplate_end_object_definition(), although it is
  still called at that time. Having it as a separate function should
  make it a bit easier to move where the auto-instantiation is done
  to a more suitable location so templates could be supported.

- Support for "+". This is a new concept in nagios.
  After listening to complaints from several of our people and
  looking at our own config files, the addition of the "+"
  functionality makes the config files a lot easier to read
  since each new line _adds_  to whatever was specified before.
  The support for "+" was written as a separate function that
  happens to be used by "services" but it can easily be used
  by other string properties.

- Cleanup, as recommended by review comments.


What does it do?

The patch adds a new directive "services" to the "host" definitions.
This new directive lists one or more "service" templates which
are used to automatically create "service" definitions for
the host.

The following sequence:

    define host{
        host_name         bogus
        address           192.168.1.254
        services          template-check-1, template-check-2
        ...
    }

is exactly equivalent to the following sequence:

    define host{
        host_name         bogus
        address           192.168.1.254
        ...
    }
    define service {
        host_name         bogus
        use               template-check-1
    }
    define service {
        host_name         bogus
        use               template-check-2
    }

Alternatively (using "+" support), you could write the above example
as follows:

    define host{
        host_name         bogus
        address           192.168.1.254
        services          + template-check-1
        services          + template-check-2
        ...
    }

Enjoy!
-Ignacio
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