[Nix-dev] xorgReplacements broke in nix-0.12pre12474

[Michael Raskin]

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Eelco Dolstra wrote:
> BTW, can someone explain to me what xorgReplacements is for?  And why the crazy
> complexity of that function:

To have xserver job using non-default set of X.org packages.

> {stdenv, fetchurl, xorg, automake, autoconf, libtool, composedArgsAndFun, ...}:
> {
>   xf86videoati = {src, suffix, ...}:
>   composedArgsAndFun stdenv.mkDerivation {
> ...
> 
> and then the call site:
> 
>   xorgReplacements = composedArgsAndFun (import
> ../servers/x11/xorg/replacements.nix) {

Probably, overgeneralization.. I just tend to use these general cases
sometimes. Usually, a bit after writing original expression..

> I don't understand any of this stuff.  I have the impression that this is highly
> user-specific customization stuff that can be ripped from Nixpkgs entirely and
> placed in ~/.nixpkgs/config.nix, but I might be mistaken.  (This applies to

Maybe we could start a separate repo for such hacks - it makes sense. If
I find anything non-trivial while making a replacement package to work,
I'd like to commit it somewhere (so when the next one with Radeon Xpress
1100 = X200M comes asking for advice with 3D/Randr, I can tell "install
that expression with such parameters"). I don't think we want any
additional effort duplication inside NixOS for external
(non-Nix-specific) issues.

> almost all the recent complexity in all-packages.nix BTW: almost all getConfig
> calls, the selectVersion calls --- it's unnecessary because it can be done more
> easily in config.nix).

I am vary to use that overriding because I am not quite sure about its
evaluation behavior in some really weird testcase that I haven't yet
invented.. Also I just do not like config.nix whenever it can be
avoided, because it makes having a few different versions more difficult.

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