943592f698
Among other things, this will allow *2nix tools to output plain data while still being composable with the traditional callPackage/.override interfaces.
216 lines
7.6 KiB
Nix
216 lines
7.6 KiB
Nix
{ lib }:
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let
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inherit (builtins) attrNames;
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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 overridden
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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 ~/.config/nixpkgs/config.nix). For instance,
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if you want to "patch" the derivation returned by a package
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function in Nixpkgs to build another version than what the
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function itself 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 lib.flip (extendDerivation true) 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` takes a function from attribute set to attribute set and
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injects `override` attibute which can be used to override arguments of
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the function.
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nix-repl> x = {a, b}: { result = a + b; }
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nix-repl> y = lib.makeOverridable x { a = 1; b = 2; }
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nix-repl> y
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{ override = «lambda»; overrideDerivation = «lambda»; result = 3; }
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nix-repl> y.override { a = 10; }
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{ override = «lambda»; overrideDerivation = «lambda»; result = 12; }
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Please refer to "Nixpkgs Contributors Guide" section
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"<pkg>.overrideDerivation" to learn about `overrideDerivation` and caveats
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related to its use.
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*/
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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 lib.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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${if ff ? overrideAttrs then "overrideAttrs" else null} = fdrv:
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makeOverridable (args: (f args).overrideAttrs fdrv) origArgs;
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})
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else if lib.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 lib.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (lib.functionArgs f) autoArgs;
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in makeOverridable f (auto // args);
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/* Like callPackage, but for a function that returns an attribute
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set of derivations. The override function is added to the
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individual attributes. */
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callPackagesWith = autoArgs: fn: args:
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let
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f = if lib.isFunction fn then fn else import fn;
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auto = builtins.intersectAttrs (lib.functionArgs f) autoArgs;
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origArgs = auto // args;
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pkgs = f origArgs;
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mkAttrOverridable = name: pkg: makeOverridable (newArgs: (f newArgs).${name}) origArgs;
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in lib.mapAttrs mkAttrOverridable pkgs;
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/* Add attributes to each output of a derivation without changing
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the derivation itself and check a given condition when evaluating. */
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extendDerivation = condition: passthru: drv:
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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.${outputName}) type outputName;
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drvPath = assert condition; drv.${outputName}.drvPath;
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outPath = assert condition; drv.${outputName}.outPath;
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};
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};
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outputsList = map outputToAttrListElement outputs;
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in commonAttrs // {
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outputUnspecified = true;
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drvPath = assert condition; drv.drvPath;
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outPath = assert condition; drv.outPath;
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};
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/* Add attributes to each output of a derivation without changing
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the derivation itself. */
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addPassthru =
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lib.warn "`addPassthru drv passthru` is deprecated, replace with `extendDerivation true passthru drv`"
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(drv: passthru: extendDerivation true passthru drv);
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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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/* Make a set of packages with a common scope. All packages called
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with the provided `callPackage' will be evaluated with the same
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arguments. Any package in the set may depend on any other. The
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`overrideScope' function allows subsequent modification of the package
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set in a consistent way, i.e. all packages in the set will be
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called with the overridden packages. The package sets may be
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hierarchical: the packages in the set are called with the scope
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provided by `newScope' and the set provides a `newScope' attribute
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which can form the parent scope for later package sets. */
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makeScope = newScope: f:
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let self = f self // {
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newScope = scope: newScope (self // scope);
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callPackage = self.newScope {};
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overrideScope = g:
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makeScope newScope
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(self_: let super = f self_; in super // g super self_);
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packages = f;
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};
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in self;
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}
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