314e8e49ec
It's unused, and also a bad idea: because it recursively recomputes every function argument and there is no sharing, you can get an exponential (?) blowup in evaluation time. For example, evaluating ‘linuxPackages.kernel’ takes 0.09s and ~13 MiB, but evaluating ‘linuxPackages.kernel.deepOverride {}’ takes 3.6s and ~305 MiB.
150 lines
4.8 KiB
Nix
150 lines
4.8 KiB
Nix
let
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lib = import ./default.nix;
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inherit (builtins) 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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*/
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overrideDerivation = drv: f:
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let
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newDrv = derivation (drv.drvAttrs // (f drv));
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in addPassthru newDrv (
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{ meta = drv.meta or {};
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passthru = if drv ? passthru then drv.passthru else {};
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}
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//
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(drv.passthru or {})
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//
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(if (drv ? crossDrv && drv ? nativeDrv)
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then {
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crossDrv = overrideDerivation drv.crossDrv f;
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nativeDrv = overrideDerivation drv.nativeDrv f;
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}
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else { }));
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makeOverridable = f: origArgs:
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let
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ff = f origArgs;
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overrideWith = newArgs: origArgs // (if builtins.isFunction newArgs then newArgs origArgs else newArgs);
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in
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if builtins.isAttrs ff then (ff //
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{ override = newArgs: makeOverridable f (overrideWith newArgs);
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overrideDerivation = fdrv:
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makeOverridable (args: overrideDerivation (f args) fdrv) origArgs;
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})
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else if builtins.isFunction ff then
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{ override = newArgs: makeOverridable f (overrideWith newArgs);
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__functor = self: ff;
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overrideDerivation = throw "overrideDerivation not yet supported for functors";
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}
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else ff;
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/* Call the package function in the file `fn' with the required
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arguments automatically. The function is called with the
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arguments `args', but any missing arguments are obtained from
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`autoArgs'. This function is intended to be partially
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parameterised, e.g.,
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callPackage = callPackageWith pkgs;
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pkgs = {
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libfoo = callPackage ./foo.nix { };
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libbar = callPackage ./bar.nix { };
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};
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If the `libbar' function expects an argument named `libfoo', it is
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automatically passed as an argument. Overrides or missing
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arguments can be supplied in `args', e.g.
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libbar = callPackage ./bar.nix {
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libfoo = null;
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enableX11 = true;
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};
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*/
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callPackageWith = autoArgs: fn: args:
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let
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f = if builtins.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (builtins.functionArgs f) autoArgs;
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in makeOverridable f (auto // args);
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/* Add attributes to each output of a derivation without changing the derivation itself */
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addPassthru = drv: passthru:
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let
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outputs = drv.outputs or [ "out" ];
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commonAttrs = drv // (builtins.listToAttrs outputsList) //
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({ all = map (x: x.value) outputsList; }) // passthru;
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outputToAttrListElement = outputName:
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{ name = outputName;
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value = commonAttrs // {
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inherit (drv.${outputName}) outPath drvPath type outputName;
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};
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};
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outputsList = map outputToAttrListElement outputs;
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in commonAttrs.${drv.outputName};
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/* Strip a derivation of all non-essential attributes, returning
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only those needed by hydra-eval-jobs. Also strictly evaluate the
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result to ensure that there are no thunks kept alive to prevent
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garbage collection. */
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hydraJob = drv:
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let
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outputs = drv.outputs or ["out"];
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commonAttrs =
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{ inherit (drv) name system meta; inherit outputs; }
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// lib.optionalAttrs (drv._hydraAggregate or false) {
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_hydraAggregate = true;
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constituents = map hydraJob (lib.flatten drv.constituents);
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}
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// (lib.listToAttrs outputsList);
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makeOutput = outputName:
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let output = drv.${outputName}; in
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{ name = outputName;
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value = commonAttrs // {
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outPath = output.outPath;
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drvPath = output.drvPath;
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type = "derivation";
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inherit outputName;
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};
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};
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outputsList = map makeOutput outputs;
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drv' = (lib.head outputsList).value;
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in lib.deepSeq drv' drv';
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}
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