[ptxdist] installing different config files for lighttpd depending on some config variable

[Alexander Dahl <post@lespocky.de>]

Hei hei, 

we build or BSP in different configurations depending on some options
in the menuconfig, see:

    choice
        prompt "Vendor name     "

        config VENDOR_FOO
            bool
            prompt "foo"

        config VENDOR_BAR
            bool
            prompt "bar"

        config VENDOR_BAZ
            bool
            prompt "baz"

    endchoice

This is evaluated in several rules and in combination with collections
works quite well. In all configurations we use lighttpd as webserver,
previously with equal lighttpd.conf, but now we need different webserver
configs for each vendor/collection.

I could copy the rules/lighttpd.make from ptxdist distribution to our
BSP now and adapt it, but this would require manual attention on merging
both with each migration to a new ptxdist release and I'd like to avoid
that. 

I came across the possibility of postinst/preinst scripts in
targetinstall stage and assume I could use this. A preinst script would
populate projectroot/etc/lighttpd/lighttpd.conf with the right config
just before install_alternative() is called inside the distributed rule.

If this is a reasonable idea, where do I find documentation to these
preinst/postinst stuff? The »Don't Panic« guide doesn't cover this
topic. :-/

Greets
Alex

-- 
»With the first link, the chain is forged. The first speech censured,
the first thought forbidden, the first freedom denied, chains us all
irrevocably.« (Jean-Luc Picard, quoting Judge Aaron Satie)
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