multi target openrc script

Hi,

I'm seeking advice regarding multi target OpenRC init scripts. I'm writing an
init script to deal with starting up dm-integrity targets, and I think I would
want to get it included in sys-fs/cryptsetup eventually.

However a user can have multiple disks with an integrity layer, and I think the
init should support setting up all of them.

My question: what is the recommended way of dealing with this? I've looked at
some existing documentation[1][2], but did not find a definitive answer for it.

It seems to me different packages deal with this differently. What I've seen so
far in practice:

- netfirc: Singular configuration file /etc/conf.d/net, but requires a
  net.<interface_name> symlink per device in /etc/init.d.

- dmcrypt (from sys-fs/cryptsetup): has a singular /etc/conf.d/dmcrypt, and a
  singular /etc/init.d/dmcrypt for setting up potentially multiple LUKS volumes.
  Additionally it also supports symlinks in /etc/init.d to dmcrypt under
  different names, but also requires and equivalent config file in /etc/conf.d,
  which again can set up multiple targets.

- spawn-fcgi: One config file per instance. Requires symlinking in /etc/init.d,
  one for each instance, and an accompanying config file in /etc/conf.d.

Thanks,
Zoltan

[1] https://wiki.gentoo.org/wiki/OpenRC
[2] https://github.com/OpenRC/openrc/blob/master/service-script-guide.md

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