[Nix-dev] Re: Multiple packages from one source package

[Ludovic Courtès]

Hi,

Marc Weber <marco-oweber at gmx.de> writes:

> Then put all new files of
>   /usr/include
> into package
> libNAme-dev
>
> and all new files of
>   /usr/lib
> into package
> libNAme ?

Yes.

> So in this case you would create an expression the way it's now
>   package_lib_and_includes
>
> Then you would additionally create
>   package_lib (only copy lib to new destination and hope there are no
>               references left to the old destination)
>   package_dev_includes
>             (only copy includes to new destination and hope there are no
>               references left to the old destination)

Oh, right, so the builder of, say, `package_lib' would be along the
lines of "cp $package_lib_and_includes/lib/* $out/lib", right?  So
`package_lib_and_includes' would need to be an argument of
`package_lib'.

But then, would that really work?  `$package_lib_and_includes/lib/*' may
contain self-references to its store path that would need to be changed.
Is this done automatically?

Also, AIUI, there would be no sharing between `package_lib_and_includes'
on one hand and `package_lib' and `package_includes' on the other, since
each of them would end up having its own store path, right?  If so, that
would be an important limitation of this approach.

Thanks,
Ludovic.