RE: Scripts for /etc/init.d or /etc/rc.d

Will suggests a chkconfig-fragment to control the deployment of startup
scripts in /etc/init.d, /etc/rc1.d, etc.

>   <chkconfig-fragment><table>
>     <entry name="service">samba</entry>
>     <entry name="spec">234 21 82</entry>
>     <entry name="description">Provide file service to Windows 
>        hosts.</entry>
>   </table></chkconfig-fragment>

Jonathan suggests storing the preparation, start, and stop code in package
methods so the code can be executed under ark's control:

>     <prepare>
>         <code once-per="hosts-supported" recordable="no">
>             ...
>         </code>
>     </prepare>
> 
>     <start>
>         <constraints>
>             <dependency type="essential" name="." 
> on-method="prepare"/>
>         </constraints>
>         <code once-per="hosts-supported" recordable="no">
>             ...
>         </code>
>     </start>
> 
>     <stop>
>         <constraints>
>             <dependency type="essential" name="." 
> on-method="prepare"/>
>         </constraints>
>         <code once-per="hosts-supported" recordable="no">
>             ...
>         </code>
>     </stop>

(Jonathan also suggests how to achieve this with proto-packages.)

> You'd want to hide this sort of madness in a proto-package and
> use Will's usual trick of adding '-bits' methods that you then
> override in the actual packages ...

These two approaches could be combined.

There is enough information here for ark to assemble, install, and link
startup scripts in /etc/init.d and friends.  These standalone scripts can be
interspersed with OS-supplied scripts and can run before an ark-capable
environment is available.

The <start> and <stop> methods still can be run by ark.  Other packages'
methods can refer to them in constraints or invoke them from method code.


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