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* Quick proof-of-concept of making it easy to override package

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configuration options in ~/.nixpkgs/config.nix.  Example:

  {
    packageOverrides = pkgs: {
      subversion = pkgs.subversion.function (origArgs: {
        bdbSupport = false;
        pythonBindings = !origArgs.pythonBindings;
      });
    };
  }

  I.e. pkgs.subversion.function is the original function call to the
  Subversion function in all-packages.nix.

  This requires the "subversion" attribute to use makeOverridable,
  which stores the original function and function arguments in the
  "function" attribute of the result.

svn path=/nixpkgs/trunk/; revision=12728
This commit is contained in:
Eelco Dolstra 2008-08-26 16:50:33 +00:00
parent 6dbbd93d03
commit 5e5eeedaa6
1 changed files with 16 additions and 4 deletions
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20
pkgs/top-level/all-packages.nix
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@ -63,12 +63,20 @@ let
# configuration option, which must be a function that takes `pkgs'
# as an argument and returns a set of new or overriden packages.
# `__overrides' is a magic attribute that causes the attributes in
# its value to be added to the surrounding `rec'.
__overrides = (getConfig ["packageOverrides"] (pkgs: {})) pkgs;
# its value to be added to the surrounding `rec'. The
# `packageOverrides' function is called with the *original*
# (un-overriden) set of packages, allowing packageOverrides
# attributes to refer to the original attributes (e.g. "foo =
# ... pkgs.foo ...").
__overrides = (getConfig ["packageOverrides"] (pkgs: {})) pkgsOrig;
pkgsOrig = pkgsFun {}; # the un-overriden packages, passed to packageOverrides
pkgsOverriden = pkgsFun __overrides; # the overriden, final packages
pkgs = pkgsOverriden;
# The package compositions. Yes, this isn't properly indented.
pkgs = rec {
pkgsFun = __overrides: rec {
inherit __overrides;
@ -294,7 +302,11 @@ let
in
import (dir + "/${pVersion}.nix") (args // { version = pVersion; });
makeOverridable = f: origArgs: f origArgs //
{ function = newArgsFun: makeOverridable f (origArgs // (newArgsFun origArgs));
};
### STANDARD ENVIRONMENT
@ -6691,7 +6703,7 @@ let
subversion = subversion14;
subversion14 = import ../applications/version-management/subversion-1.4.x {
subversion14 = makeOverridable (import ../applications/version-management/subversion-1.4.x) {
inherit fetchurl stdenv apr aprutil expat swig zlib jdk;
neon = neon026;
bdbSupport = getConfig ["subversion" "bdbSupport"] true;