66 lines
2.6 KiB
Nix
66 lines
2.6 KiB
Nix
let lib = import ./default.nix;
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inherit (builtins) getAttr attrNames isFunction;
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in
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rec {
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/* `overrideDerivation drv f' takes a derivation (i.e., the result
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of a call to the builtin function `derivation') and returns a new
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derivation in which the attributes of the original are overriden
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according to the function `f'. The function `f' is called with
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the original derivation attributes.
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`overrideDerivation' allows certain "ad-hoc" customisation
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scenarios (e.g. in ~/.nixpkgs/config.nix). For instance, if you
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want to "patch" the derivation returned by a package function in
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Nixpkgs to build another version than what the function itself
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provides, you can do something like this:
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mySed = overrideDerivation pkgs.gnused (oldAttrs: {
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name = "sed-4.2.2-pre";
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src = fetchurl {
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url = ftp://alpha.gnu.org/gnu/sed/sed-4.2.2-pre.tar.bz2;
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sha256 = "11nq06d131y4wmf3drm0yk502d2xc6n5qy82cg88rb9nqd2lj41k";
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};
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patches = [];
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});
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For another application, see build-support/vm, where this
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function is used to build arbitrary derivations inside a QEMU
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virtual machine. */
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overrideDerivation = drv: f:
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let
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# Filter out special attributes.
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drop = ["meta" "passthru" "outPath" "drvPath" "hostDrv" "buildDrv" "type" "override" "deepOverride" "origArgs"]
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# also drop functions such as .merge .override etc
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++ lib.filter (n: isFunction (getAttr n drv)) (attrNames drv);
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attrs = removeAttrs drv drop;
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newDrv = derivation (attrs // (f drv));
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in newDrv //
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{ meta = if drv ? meta then drv.meta else {};
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passthru = if drv ? passthru then drv.passthru else {};
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};
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# usage: (you can use override multiple times)
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# let d = makeOverridable stdenv.mkDerivation { name = ..; buildInputs; }
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# noBuildInputs = d.override { buildInputs = []; }
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# additionalBuildInputs = d.override ( args : args // { buildInputs = args.buildInputs ++ [ additional ]; } )
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makeOverridable = f: origArgs: f origArgs //
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{ override = newArgs:
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makeOverridable f (origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs));
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deepOverride = newArgs:
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makeOverridable f (lib.overrideExisting (lib.mapAttrs (deepOverrider newArgs) origArgs) newArgs);
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origArgs = origArgs;
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};
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deepOverrider = newArgs: name: x: if builtins.isAttrs x then (
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if x ? deepOverride then (x.deepOverride newArgs) else
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if x ? override then (x.override newArgs) else
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x) else x;
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}
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