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let
stdenvFun = { }: { name = "stdenv"; };
stdenv2Fun = { }: { name = "stdenv2"; };
fetchurlFun = { stdenv }: assert stdenv.name == "stdenv"; { name = "fetchurl"; };
atermFun = { stdenv, fetchurl }: { name = "aterm-${stdenv.name}"; };
aterm2Fun = { stdenv, fetchurl }: { name = "aterm2-${stdenv.name}"; };
nixFun = { stdenv, fetchurl, aterm }: { name = "nix-${stdenv.name}-${aterm.name}"; };
mplayerFun =
{ stdenv, fetchurl, enableX11 ? false, xorg ? null, enableFoo ? true, foo ? null }:
assert stdenv.name == "stdenv2";
assert enableX11 -> xorg.libXv.name == "libXv";
assert enableFoo -> foo != null;
{ name = "mplayer-${stdenv.name}.${xorg.libXv.name}-${xorg.libX11.name}"; };
makeOverridable = f: origArgs: f origArgs //
{ override = newArgs:
makeOverridable f (origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs));
};
callPackage_ = pkgs: f: args:
makeOverridable f ((builtins.intersectAttrs (builtins.functionArgs f) pkgs) // args);
allPackages =
{ overrides ? (pkgs: pkgsPrev: { }) }:
let
callPackage = callPackage_ pkgs;
pkgs = pkgsStd // (overrides pkgs pkgsStd);
pkgsStd = {
inherit pkgs;
stdenv = callPackage stdenvFun { };
stdenv2 = callPackage stdenv2Fun { };
fetchurl = callPackage fetchurlFun { };
aterm = callPackage atermFun { };
xorg = callPackage xorgFun { };
mplayer = callPackage mplayerFun { stdenv = pkgs.stdenv2; enableFoo = false; };
nix = callPackage nixFun { };
};
in pkgs;
libX11Fun = { stdenv, fetchurl }: { name = "libX11"; };
libX11_2Fun = { stdenv, fetchurl }: { name = "libX11_2"; };
libXvFun = { stdenv, fetchurl, libX11 }: { name = "libXv"; };
xorgFun =
{ pkgs }:
let callPackage = callPackage_ (pkgs // pkgs.xorg); in
{
libX11 = callPackage libX11Fun { };
libXv = callPackage libXvFun { };
};
in
let
pkgs = allPackages { };
pkgs2 = allPackages {
overrides = pkgs: pkgsPrev: {
stdenv = pkgs.stdenv2;
nix = pkgsPrev.nix.override { aterm = aterm2Fun { inherit (pkgs) stdenv fetchurl; }; };
xorg = pkgsPrev.xorg // { libX11 = libX11_2Fun { inherit (pkgs) stdenv fetchurl; }; };
};
};
in
[ pkgs.stdenv.name
pkgs.fetchurl.name
pkgs.aterm.name
pkgs2.aterm.name
pkgs.xorg.libX11.name
pkgs.xorg.libXv.name
pkgs.mplayer.name
pkgs2.mplayer.name
pkgs.nix.name
pkgs2.nix.name
]
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