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473ac9692e
By allowing null, we allow code to avoid filterAttrs, improving laziness in real world use cases. Specifically, this strategy prevents infinite recursion errors, performance issues and possibly other errors that are unrelated to the user's code.
309 lines
12 KiB
Nix
309 lines
12 KiB
Nix
{ lib }:
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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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Note that in order to preserve evaluation errors, the new derivation's
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outPath depends on the old one's, which means that this function cannot
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be used in circular situations when the old derivation also depends on the
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new one.
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You should in general prefer `drv.overrideAttrs` over this function;
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see the nixpkgs manual for more information on overriding.
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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 (builtins.seq drv.drvPath 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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# TODO(@Artturin): remove before release 23.05 and only have __spliced.
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(lib.optionalAttrs (drv ? crossDrv && drv ? nativeDrv) {
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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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//
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lib.optionalAttrs (drv ? __spliced) {
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__spliced = {} // (lib.mapAttrs (_: sDrv: overrideDerivation sDrv f) drv.__spliced);
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});
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/* `makeOverridable` takes a function from attribute set to attribute set and
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injects `override` attribute 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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result = f origArgs;
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# Creates a functor with the same arguments as f
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copyArgs = g: lib.setFunctionArgs g (lib.functionArgs f);
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# Changes the original arguments with (potentially a function that returns) a set of new attributes
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overrideWith = newArgs: origArgs // (if lib.isFunction newArgs then newArgs origArgs else newArgs);
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# Re-call the function but with different arguments
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overrideArgs = copyArgs (newArgs: makeOverridable f (overrideWith newArgs));
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# Change the result of the function call by applying g to it
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overrideResult = g: makeOverridable (copyArgs (args: g (f args))) origArgs;
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in
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if builtins.isAttrs result then
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result // {
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override = overrideArgs;
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overrideDerivation = fdrv: overrideResult (x: overrideDerivation x fdrv);
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${if result ? overrideAttrs then "overrideAttrs" else null} = fdrv:
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overrideResult (x: x.overrideAttrs fdrv);
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}
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else if lib.isFunction result then
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# Transform the result into a functor while propagating its arguments
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lib.setFunctionArgs result (lib.functionArgs result) // {
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override = overrideArgs;
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}
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else result;
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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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fargs = lib.functionArgs f;
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# All arguments that will be passed to the function
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# This includes automatic ones and ones passed explicitly
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allArgs = builtins.intersectAttrs fargs autoArgs // args;
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# A list of argument names that the function requires, but
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# wouldn't be passed to it
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missingArgs = lib.attrNames
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# Filter out arguments that have a default value
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(lib.filterAttrs (name: value: ! value)
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# Filter out arguments that would be passed
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(removeAttrs fargs (lib.attrNames allArgs)));
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# Get a list of suggested argument names for a given missing one
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getSuggestions = arg: lib.pipe (autoArgs // args) [
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lib.attrNames
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# Only use ones that are at most 2 edits away. While mork would work,
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# levenshteinAtMost is only fast for 2 or less.
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(lib.filter (lib.strings.levenshteinAtMost 2 arg))
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# Put strings with shorter distance first
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(lib.sort (x: y: lib.strings.levenshtein x arg < lib.strings.levenshtein y arg))
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# Only take the first couple results
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(lib.take 3)
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# Quote all entries
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(map (x: "\"" + x + "\""))
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];
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prettySuggestions = suggestions:
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if suggestions == [] then ""
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else if lib.length suggestions == 1 then ", did you mean ${lib.elemAt suggestions 0}?"
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else ", did you mean ${lib.concatStringsSep ", " (lib.init suggestions)} or ${lib.last suggestions}?";
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errorForArg = arg:
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let
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loc = builtins.unsafeGetAttrPos arg fargs;
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# loc' can be removed once lib/minver.nix is >2.3.4, since that includes
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# https://github.com/NixOS/nix/pull/3468 which makes loc be non-null
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loc' = if loc != null then loc.file + ":" + toString loc.line
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else if ! lib.isFunction fn then
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toString fn + lib.optionalString (lib.sources.pathIsDirectory fn) "/default.nix"
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else "<unknown location>";
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in "Function called without required argument \"${arg}\" at "
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+ "${loc'}${prettySuggestions (getSuggestions arg)}";
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# Only show the error for the first missing argument
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error = errorForArg (lib.head missingArgs);
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in if missingArgs == [] then makeOverridable f allArgs else throw error;
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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: _: makeOverridable (newArgs: (f newArgs).${name}) origArgs;
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in
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if lib.isDerivation pkgs then throw
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("function `callPackages` was called on a *single* derivation "
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+ ''"${pkgs.name or "<unknown-name>"}";''
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+ " did you mean to use `callPackage` instead?")
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else 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.${outputName}) type outputName;
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outputSpecified = true;
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drvPath = assert condition; drv.${outputName}.drvPath;
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outPath = assert condition; drv.${outputName}.outPath;
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};
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};
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outputsList = map outputToAttrListElement outputs;
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in commonAttrs // {
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drvPath = assert condition; drv.drvPath;
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outPath = assert condition; drv.outPath;
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};
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/* Strip a derivation of all non-essential attributes, returning
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only those needed by hydra-eval-jobs. Also strictly evaluate the
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result to ensure that there are no thunks kept alive to prevent
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garbage collection. */
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hydraJob = drv:
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let
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outputs = drv.outputs or ["out"];
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commonAttrs =
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{ inherit (drv) name system meta; inherit outputs; }
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// lib.optionalAttrs (drv._hydraAggregate or false) {
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_hydraAggregate = true;
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constituents = map hydraJob (lib.flatten drv.constituents);
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}
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// (lib.listToAttrs outputsList);
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makeOutput = outputName:
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let output = drv.${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 if drv == null then null else
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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: lib.warn
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"`overrideScope` (from `lib.makeScope`) is deprecated. Do `overrideScope' (self: super: { … })` instead of `overrideScope (super: self: { … })`. All other overrides have the parameters in that order, including other definitions of `overrideScope`. This was the only definition violating the pattern."
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(makeScope newScope (lib.fixedPoints.extends (lib.flip g) f));
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overrideScope' = g: makeScope newScope (lib.fixedPoints.extends g f);
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packages = f;
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};
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in self;
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/* Like the above, but aims to support cross compilation. It's still ugly, but
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hopefully it helps a little bit. */
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makeScopeWithSplicing = splicePackages: newScope: otherSplices: keep: extra: f:
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let
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spliced0 = splicePackages {
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pkgsBuildBuild = otherSplices.selfBuildBuild;
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pkgsBuildHost = otherSplices.selfBuildHost;
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pkgsBuildTarget = otherSplices.selfBuildTarget;
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pkgsHostHost = otherSplices.selfHostHost;
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pkgsHostTarget = self; # Not `otherSplices.selfHostTarget`;
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pkgsTargetTarget = otherSplices.selfTargetTarget;
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};
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spliced = extra spliced0 // spliced0 // keep self;
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self = f self // {
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newScope = scope: newScope (spliced // scope);
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callPackage = newScope spliced; # == self.newScope {};
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# N.B. the other stages of the package set spliced in are *not*
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# overridden.
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overrideScope = g: makeScopeWithSplicing
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splicePackages
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newScope
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otherSplices
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keep
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extra
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(lib.fixedPoints.extends g f);
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packages = f;
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};
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in self;
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}
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