runsvdir under runsv

[Lasse Kliemann <lasse-list-supervision-2007@plastictree.net>]

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I'd like to run a bunch of services in a kind of sub-hierarchy under 
`/service/sub'; more precisely the service in `/service/sub' shall be something 
like runsvdir managing services in a directory `/service/sub/service'.

The naive approach was to let `/service/sub/run' be like this:

   #!/bin/sh
   exec runsvdir service

One problem with this is that bringing down all services in 
`/service/sub/services' involves something like

   sv o /service/sub ; sv h /service/sub

meaning that a simple removal of `/service/sub' is not enough, for this only 
will essentially result in a `sv x /service/sub' (according to the 
documentation of runit). As a solution, I came up with putting

   #!/bin/sh
   sv h .

into `control/t'. It seems to work, but I am not sure whether this is a good 
solution, in particular whether it is free of race-conditions.

Comments are welcome.

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