1177 lines
46 KiB
Nix
1177 lines
46 KiB
Nix
{ lib }:
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let
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inherit (lib)
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all
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any
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attrByPath
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attrNames
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catAttrs
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concatLists
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concatMap
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concatStringsSep
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elem
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filter
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foldl'
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getAttrFromPath
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head
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id
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imap1
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isAttrs
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isBool
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isFunction
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isList
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isString
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length
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mapAttrs
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mapAttrsToList
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mapAttrsRecursiveCond
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min
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optional
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optionalAttrs
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optionalString
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recursiveUpdate
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reverseList sort
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setAttrByPath
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types
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warnIf
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zipAttrsWith
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;
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inherit (lib.options)
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isOption
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mkOption
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showDefs
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showFiles
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showOption
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unknownModule
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;
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showDeclPrefix = loc: decl: prefix:
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" - option(s) with prefix `${showOption (loc ++ [prefix])}' in module `${decl._file}'";
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showRawDecls = loc: decls:
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concatStringsSep "\n"
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(sort (a: b: a < b)
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(concatMap
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(decl: map
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(showDeclPrefix loc decl)
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(attrNames decl.options)
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)
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decls
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));
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in
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rec {
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/*
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Evaluate a set of modules. The result is a set with the attributes:
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‘options’: The nested set of all option declarations,
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‘config’: The nested set of all option values.
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‘type’: A module system type representing the module set as a submodule,
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to be extended by configuration from the containing module set.
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This is also available as the module argument ‘moduleType’.
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‘extendModules’: A function similar to ‘evalModules’ but building on top
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of the module set. Its arguments, ‘modules’ and ‘specialArgs’ are
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added to the existing values.
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Using ‘extendModules’ a few times has no performance impact as long
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as you only reference the final ‘options’ and ‘config’.
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If you do reference multiple ‘config’ (or ‘options’) from before and
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after ‘extendModules’, performance is the same as with multiple
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‘evalModules’ invocations, because the new modules' ability to
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override existing configuration fundamentally requires a new
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fixpoint to be constructed.
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This is also available as a module argument.
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‘_module’: A portion of the configuration tree which is elided from
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‘config’. It contains some values that are mostly internal to the
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module system implementation.
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!!! Please think twice before adding to this argument list! The more
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that is specified here instead of in the modules themselves the harder
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it is to transparently move a set of modules to be a submodule of another
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config (as the proper arguments need to be replicated at each call to
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evalModules) and the less declarative the module set is. */
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evalModules = evalModulesArgs@
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{ modules
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, prefix ? []
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, # This should only be used for special arguments that need to be evaluated
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# when resolving module structure (like in imports). For everything else,
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# there's _module.args. If specialArgs.modulesPath is defined it will be
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# used as the base path for disabledModules.
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specialArgs ? {}
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, # This would be remove in the future, Prefer _module.args option instead.
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args ? {}
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, # This would be remove in the future, Prefer _module.check option instead.
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check ? true
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}:
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let
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withWarnings = x:
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lib.warnIf (evalModulesArgs?args) "The args argument to evalModules is deprecated. Please set config._module.args instead."
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lib.warnIf (evalModulesArgs?check) "The check argument to evalModules is deprecated. Please set config._module.check instead."
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x;
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legacyModules =
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optional (evalModulesArgs?args) {
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config = {
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_module.args = args;
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};
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}
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++ optional (evalModulesArgs?check) {
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config = {
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_module.check = mkDefault check;
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};
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};
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regularModules = modules ++ legacyModules;
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# This internal module declare internal options under the `_module'
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# attribute. These options are fragile, as they are used by the
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# module system to change the interpretation of modules.
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#
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# When extended with extendModules or moduleType, a fresh instance of
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# this module is used, to avoid conflicts and allow chaining of
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# extendModules.
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internalModule = rec {
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_file = "lib/modules.nix";
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key = _file;
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options = {
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_module.args = mkOption {
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# Because things like `mkIf` are entirely useless for
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# `_module.args` (because there's no way modules can check which
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# arguments were passed), we'll use `lazyAttrsOf` which drops
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# support for that, in turn it's lazy in its values. This means e.g.
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# a `_module.args.pkgs = import (fetchTarball { ... }) {}` won't
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# start a download when `pkgs` wasn't evaluated.
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type = types.lazyAttrsOf types.raw;
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# Only render documentation once at the root of the option tree,
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# not for all individual submodules.
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# Allow merging option decls to make this internal regardless.
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${if prefix == []
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then null # unset => visible
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else "internal"} = true;
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# TODO: Change the type of this option to a submodule with a
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# freeformType, so that individual arguments can be documented
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# separately
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description = lib.mdDoc ''
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Additional arguments passed to each module in addition to ones
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like `lib`, `config`,
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and `pkgs`, `modulesPath`.
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This option is also available to all submodules. Submodules do not
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inherit args from their parent module, nor do they provide args to
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their parent module or sibling submodules. The sole exception to
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this is the argument `name` which is provided by
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parent modules to a submodule and contains the attribute name
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the submodule is bound to, or a unique generated name if it is
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not bound to an attribute.
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Some arguments are already passed by default, of which the
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following *cannot* be changed with this option:
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- {var}`lib`: The nixpkgs library.
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- {var}`config`: The results of all options after merging the values from all modules together.
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- {var}`options`: The options declared in all modules.
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- {var}`specialArgs`: The `specialArgs` argument passed to `evalModules`.
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- All attributes of {var}`specialArgs`
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Whereas option values can generally depend on other option values
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thanks to laziness, this does not apply to `imports`, which
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must be computed statically before anything else.
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For this reason, callers of the module system can provide `specialArgs`
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which are available during import resolution.
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For NixOS, `specialArgs` includes
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{var}`modulesPath`, which allows you to import
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extra modules from the nixpkgs package tree without having to
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somehow make the module aware of the location of the
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`nixpkgs` or NixOS directories.
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```
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{ modulesPath, ... }: {
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imports = [
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(modulesPath + "/profiles/minimal.nix")
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];
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}
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```
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For NixOS, the default value for this option includes at least this argument:
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- {var}`pkgs`: The nixpkgs package set according to
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the {option}`nixpkgs.pkgs` option.
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'';
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};
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_module.check = mkOption {
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type = types.bool;
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internal = true;
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default = true;
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description = lib.mdDoc "Whether to check whether all option definitions have matching declarations.";
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};
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_module.freeformType = mkOption {
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type = types.nullOr types.optionType;
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internal = true;
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default = null;
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description = lib.mdDoc ''
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If set, merge all definitions that don't have an associated option
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together using this type. The result then gets combined with the
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values of all declared options to produce the final `
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config` value.
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If this is `null`, definitions without an option
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will throw an error unless {option}`_module.check` is
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turned off.
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'';
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};
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_module.specialArgs = mkOption {
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readOnly = true;
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internal = true;
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description = lib.mdDoc ''
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Externally provided module arguments that can't be modified from
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within a configuration, but can be used in module imports.
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'';
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};
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};
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config = {
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_module.args = {
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inherit extendModules;
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moduleType = type;
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};
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_module.specialArgs = specialArgs;
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};
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};
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merged =
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let collected = collectModules
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(specialArgs.modulesPath or "")
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(regularModules ++ [ internalModule ])
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({ inherit lib options config specialArgs; } // specialArgs);
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in mergeModules prefix (reverseList collected);
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options = merged.matchedOptions;
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config =
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let
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# For definitions that have an associated option
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declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
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# If freeformType is set, this is for definitions that don't have an associated option
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freeformConfig =
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let
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defs = map (def: {
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file = def.file;
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value = setAttrByPath def.prefix def.value;
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}) merged.unmatchedDefns;
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in if defs == [] then {}
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else declaredConfig._module.freeformType.merge prefix defs;
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in if declaredConfig._module.freeformType == null then declaredConfig
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# Because all definitions that had an associated option ended in
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# declaredConfig, freeformConfig can only contain the non-option
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# paths, meaning recursiveUpdate will never override any value
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else recursiveUpdate freeformConfig declaredConfig;
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checkUnmatched =
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if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
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let
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firstDef = head merged.unmatchedDefns;
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baseMsg =
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let
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optText = showOption (prefix ++ firstDef.prefix);
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defText =
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builtins.addErrorContext
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"while evaluating the error message for definitions for `${optText}', which is an option that does not exist"
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(builtins.addErrorContext
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"while evaluating a definition from `${firstDef.file}'"
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( showDefs [ firstDef ])
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);
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in
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"The option `${optText}' does not exist. Definition values:${defText}";
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in
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if attrNames options == [ "_module" ]
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then
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let
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optionName = showOption prefix;
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in
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if optionName == ""
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then throw ''
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${baseMsg}
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It seems as if you're trying to declare an option by placing it into `config' rather than `options'!
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''
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else
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throw ''
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${baseMsg}
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However there are no options defined in `${showOption prefix}'. Are you sure you've
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declared your options properly? This can happen if you e.g. declared your options in `types.submodule'
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under `config' rather than `options'.
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''
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else throw baseMsg
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else null;
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checked = builtins.seq checkUnmatched;
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extendModules = extendArgs@{
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modules ? [],
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specialArgs ? {},
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prefix ? [],
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}:
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evalModules (evalModulesArgs // {
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modules = regularModules ++ modules;
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specialArgs = evalModulesArgs.specialArgs or {} // specialArgs;
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prefix = extendArgs.prefix or evalModulesArgs.prefix or [];
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});
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type = lib.types.submoduleWith {
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inherit modules specialArgs;
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};
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result = withWarnings {
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options = checked options;
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config = checked (removeAttrs config [ "_module" ]);
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_module = checked (config._module);
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inherit extendModules type;
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};
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in result;
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# collectModules :: (modulesPath: String) -> (modules: [ Module ]) -> (args: Attrs) -> [ Module ]
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#
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# Collects all modules recursively through `import` statements, filtering out
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# all modules in disabledModules.
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collectModules = let
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# Like unifyModuleSyntax, but also imports paths and calls functions if necessary
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loadModule = args: fallbackFile: fallbackKey: m:
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if isFunction m || isAttrs m then
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unifyModuleSyntax fallbackFile fallbackKey (applyModuleArgsIfFunction fallbackKey m args)
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else if isList m then
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let defs = [{ file = fallbackFile; value = m; }]; in
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throw "Module imports can't be nested lists. Perhaps you meant to remove one level of lists? Definitions: ${showDefs defs}"
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else unifyModuleSyntax (toString m) (toString m) (applyModuleArgsIfFunction (toString m) (import m) args);
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/*
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Collects all modules recursively into the form
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{
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disabled = [ <list of disabled modules> ];
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# All modules of the main module list
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modules = [
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{
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key = <key1>;
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module = <module for key1>;
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# All modules imported by the module for key1
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modules = [
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{
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key = <key1-1>;
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module = <module for key1-1>;
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# All modules imported by the module for key1-1
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modules = [ ... ];
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}
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...
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];
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}
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...
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];
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}
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*/
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collectStructuredModules =
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let
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collectResults = modules: {
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disabled = concatLists (catAttrs "disabled" modules);
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inherit modules;
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};
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in parentFile: parentKey: initialModules: args: collectResults (imap1 (n: x:
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let
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module = loadModule args parentFile "${parentKey}:anon-${toString n}" x;
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collectedImports = collectStructuredModules module._file module.key module.imports args;
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in {
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key = module.key;
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module = module;
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modules = collectedImports.modules;
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disabled = module.disabledModules ++ collectedImports.disabled;
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}) initialModules);
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# filterModules :: String -> { disabled, modules } -> [ Module ]
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#
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# Filters a structure as emitted by collectStructuredModules by removing all disabled
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# modules recursively. It returns the final list of unique-by-key modules
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filterModules = modulesPath: { disabled, modules }:
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let
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moduleKey = m: if isString m && (builtins.substring 0 1 m != "/")
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then toString modulesPath + "/" + m
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else toString m;
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disabledKeys = map moduleKey disabled;
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keyFilter = filter (attrs: ! elem attrs.key disabledKeys);
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in map (attrs: attrs.module) (builtins.genericClosure {
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startSet = keyFilter modules;
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operator = attrs: keyFilter attrs.modules;
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});
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in modulesPath: initialModules: args:
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filterModules modulesPath (collectStructuredModules unknownModule "" initialModules args);
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/* Wrap a module with a default location for reporting errors. */
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setDefaultModuleLocation = file: m:
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{ _file = file; imports = [ m ]; };
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/* Massage a module into canonical form, that is, a set consisting
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of ‘options’, ‘config’ and ‘imports’ attributes. */
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unifyModuleSyntax = file: key: m:
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let
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addMeta = config: if m ? meta
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then mkMerge [ config { meta = m.meta; } ]
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else config;
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addFreeformType = config: if m ? freeformType
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then mkMerge [ config { _module.freeformType = m.freeformType; } ]
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else config;
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in
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if m ? config || m ? options then
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let badAttrs = removeAttrs m ["_file" "key" "disabledModules" "imports" "options" "config" "meta" "freeformType"]; in
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if badAttrs != {} then
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throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'. This is caused by introducing a top-level `config' or `options' attribute. Add configuration attributes immediately on the top level instead, or move all of them (namely: ${toString (attrNames badAttrs)}) into the explicit `config' attribute."
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else
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{ _file = toString m._file or file;
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key = toString m.key or key;
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disabledModules = m.disabledModules or [];
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imports = m.imports or [];
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options = m.options or {};
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config = addFreeformType (addMeta (m.config or {}));
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}
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else
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# shorthand syntax
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lib.throwIfNot (isAttrs m) "module ${file} (${key}) does not look like a module."
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{ _file = toString m._file or file;
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key = toString m.key or key;
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disabledModules = m.disabledModules or [];
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imports = m.require or [] ++ m.imports or [];
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options = {};
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config = addFreeformType (removeAttrs m ["_file" "key" "disabledModules" "require" "imports" "freeformType"]);
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};
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applyModuleArgsIfFunction = key: f: args@{ config, options, lib, ... }: if isFunction f then
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let
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# Module arguments are resolved in a strict manner when attribute set
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# deconstruction is used. As the arguments are now defined with the
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# config._module.args option, the strictness used on the attribute
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# set argument would cause an infinite loop, if the result of the
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# option is given as argument.
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#
|
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# To work-around the strictness issue on the deconstruction of the
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# attributes set argument, we create a new attribute set which is
|
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# constructed to satisfy the expected set of attributes. Thus calling
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# a module will resolve strictly the attributes used as argument but
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# not their values. The values are forwarding the result of the
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# evaluation of the option.
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context = name: ''while evaluating the module argument `${name}' in "${key}":'';
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extraArgs = builtins.mapAttrs (name: _:
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builtins.addErrorContext (context name)
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(args.${name} or config._module.args.${name})
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) (lib.functionArgs f);
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||
|
||
# Note: we append in the opposite order such that we can add an error
|
||
# context on the explicit arguments of "args" too. This update
|
||
# operator is used to make the "args@{ ... }: with args.lib;" notation
|
||
# works.
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||
in f (args // extraArgs)
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||
else
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f;
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||
|
||
/* Merge a list of modules. This will recurse over the option
|
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declarations in all modules, combining them into a single set.
|
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At the same time, for each option declaration, it will merge the
|
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corresponding option definitions in all machines, returning them
|
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in the ‘value’ attribute of each option.
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||
|
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This returns a set like
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{
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# A recursive set of options along with their final values
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matchedOptions = {
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foo = { _type = "option"; value = "option value of foo"; ... };
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bar.baz = { _type = "option"; value = "option value of bar.baz"; ... };
|
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...
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};
|
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# A list of definitions that weren't matched by any option
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unmatchedDefns = [
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{ file = "file.nix"; prefix = [ "qux" ]; value = "qux"; }
|
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...
|
||
];
|
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}
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*/
|
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mergeModules = prefix: modules:
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mergeModules' prefix modules
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(concatMap (m: map (config: { file = m._file; inherit config; }) (pushDownProperties m.config)) modules);
|
||
|
||
mergeModules' = prefix: options: configs:
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let
|
||
/* byName is like foldAttrs, but will look for attributes to merge in the
|
||
specified attribute name.
|
||
|
||
byName "foo" (module: value: ["module.hidden=${module.hidden},value=${value}"])
|
||
[
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{
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hidden="baz";
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||
foo={qux="bar"; gla="flop";};
|
||
}
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||
{
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hidden="fli";
|
||
foo={qux="gne"; gli="flip";};
|
||
}
|
||
]
|
||
===>
|
||
{
|
||
gla = [ "module.hidden=baz,value=flop" ];
|
||
gli = [ "module.hidden=fli,value=flip" ];
|
||
qux = [ "module.hidden=baz,value=bar" "module.hidden=fli,value=gne" ];
|
||
}
|
||
*/
|
||
byName = attr: f: modules:
|
||
zipAttrsWith (n: concatLists)
|
||
(map (module: let subtree = module.${attr}; in
|
||
if !(builtins.isAttrs subtree) then
|
||
throw ''
|
||
You're trying to declare a value of type `${builtins.typeOf subtree}'
|
||
rather than an attribute-set for the option
|
||
`${builtins.concatStringsSep "." prefix}'!
|
||
|
||
This usually happens if `${builtins.concatStringsSep "." prefix}' has option
|
||
definitions inside that are not matched. Please check how to properly define
|
||
this option by e.g. referring to `man 5 configuration.nix'!
|
||
''
|
||
else
|
||
mapAttrs (n: f module) subtree
|
||
) modules);
|
||
# an attrset 'name' => list of submodules that declare ‘name’.
|
||
declsByName = byName "options" (module: option:
|
||
[{ inherit (module) _file; options = option; }]
|
||
) options;
|
||
# an attrset 'name' => list of submodules that define ‘name’.
|
||
defnsByName = byName "config" (module: value:
|
||
map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
|
||
) configs;
|
||
# extract the definitions for each loc
|
||
defnsByName' = byName "config" (module: value:
|
||
[{ inherit (module) file; inherit value; }]
|
||
) configs;
|
||
|
||
# Convert an option tree decl to a submodule option decl
|
||
optionTreeToOption = decl:
|
||
if isOption decl.options
|
||
then decl
|
||
else decl // {
|
||
options = mkOption {
|
||
type = types.submoduleWith {
|
||
modules = [ { options = decl.options; } ];
|
||
# `null` is not intended for use by modules. It is an internal
|
||
# value that means "whatever the user has declared elsewhere".
|
||
# This might become obsolete with https://github.com/NixOS/nixpkgs/issues/162398
|
||
shorthandOnlyDefinesConfig = null;
|
||
};
|
||
};
|
||
};
|
||
|
||
resultsByName = mapAttrs (name: decls:
|
||
# We're descending into attribute ‘name’.
|
||
let
|
||
loc = prefix ++ [name];
|
||
defns = defnsByName.${name} or [];
|
||
defns' = defnsByName'.${name} or [];
|
||
optionDecls = filter (m: isOption m.options) decls;
|
||
in
|
||
if length optionDecls == length decls then
|
||
let opt = fixupOptionType loc (mergeOptionDecls loc decls);
|
||
in {
|
||
matchedOptions = evalOptionValue loc opt defns';
|
||
unmatchedDefns = [];
|
||
}
|
||
else if optionDecls != [] then
|
||
if all (x: x.options.type.name == "submodule") optionDecls
|
||
# Raw options can only be merged into submodules. Merging into
|
||
# attrsets might be nice, but ambiguous. Suppose we have
|
||
# attrset as a `attrsOf submodule`. User declares option
|
||
# attrset.foo.bar, this could mean:
|
||
# a. option `bar` is only available in `attrset.foo`
|
||
# b. option `foo.bar` is available in all `attrset.*`
|
||
# c. reject and require "<name>" as a reminder that it behaves like (b).
|
||
# d. magically combine (a) and (c).
|
||
# All of the above are merely syntax sugar though.
|
||
then
|
||
let opt = fixupOptionType loc (mergeOptionDecls loc (map optionTreeToOption decls));
|
||
in {
|
||
matchedOptions = evalOptionValue loc opt defns';
|
||
unmatchedDefns = [];
|
||
}
|
||
else
|
||
let
|
||
nonOptions = filter (m: !isOption m.options) decls;
|
||
in
|
||
throw "The option `${showOption loc}' in module `${(lib.head optionDecls)._file}' would be a parent of the following options, but its type `${(lib.head optionDecls).options.type.description or "<no description>"}' does not support nested options.\n${
|
||
showRawDecls loc nonOptions
|
||
}"
|
||
else
|
||
mergeModules' loc decls defns) declsByName;
|
||
|
||
matchedOptions = mapAttrs (n: v: v.matchedOptions) resultsByName;
|
||
|
||
# an attrset 'name' => list of unmatched definitions for 'name'
|
||
unmatchedDefnsByName =
|
||
# Propagate all unmatched definitions from nested option sets
|
||
mapAttrs (n: v: v.unmatchedDefns) resultsByName
|
||
# Plus the definitions for the current prefix that don't have a matching option
|
||
// removeAttrs defnsByName' (attrNames matchedOptions);
|
||
in {
|
||
inherit matchedOptions;
|
||
|
||
# Transforms unmatchedDefnsByName into a list of definitions
|
||
unmatchedDefns =
|
||
if configs == []
|
||
then
|
||
# When no config values exist, there can be no unmatched config, so
|
||
# we short circuit and avoid evaluating more _options_ than necessary.
|
||
[]
|
||
else
|
||
concatLists (mapAttrsToList (name: defs:
|
||
map (def: def // {
|
||
# Set this so we know when the definition first left unmatched territory
|
||
prefix = [name] ++ (def.prefix or []);
|
||
}) defs
|
||
) unmatchedDefnsByName);
|
||
};
|
||
|
||
/* Merge multiple option declarations into a single declaration. In
|
||
general, there should be only one declaration of each option.
|
||
The exception is the ‘options’ attribute, which specifies
|
||
sub-options. These can be specified multiple times to allow one
|
||
module to add sub-options to an option declared somewhere else
|
||
(e.g. multiple modules define sub-options for ‘fileSystems’).
|
||
|
||
'loc' is the list of attribute names where the option is located.
|
||
|
||
'opts' is a list of modules. Each module has an options attribute which
|
||
correspond to the definition of 'loc' in 'opt.file'. */
|
||
mergeOptionDecls =
|
||
loc: opts:
|
||
foldl' (res: opt:
|
||
let t = res.type;
|
||
t' = opt.options.type;
|
||
mergedType = t.typeMerge t'.functor;
|
||
typesMergeable = mergedType != null;
|
||
typeSet = if (bothHave "type") && typesMergeable
|
||
then { type = mergedType; }
|
||
else {};
|
||
bothHave = k: opt.options ? ${k} && res ? ${k};
|
||
in
|
||
if bothHave "default" ||
|
||
bothHave "example" ||
|
||
bothHave "description" ||
|
||
bothHave "apply" ||
|
||
(bothHave "type" && (! typesMergeable))
|
||
then
|
||
throw "The option `${showOption loc}' in `${opt._file}' is already declared in ${showFiles res.declarations}."
|
||
else
|
||
let
|
||
getSubModules = opt.options.type.getSubModules or null;
|
||
submodules =
|
||
if getSubModules != null then map (setDefaultModuleLocation opt._file) getSubModules ++ res.options
|
||
else res.options;
|
||
in opt.options // res //
|
||
{ declarations = res.declarations ++ [opt._file];
|
||
options = submodules;
|
||
} // typeSet
|
||
) { inherit loc; declarations = []; options = []; } opts;
|
||
|
||
/* Merge all the definitions of an option to produce the final
|
||
config value. */
|
||
evalOptionValue = loc: opt: defs:
|
||
let
|
||
# Add in the default value for this option, if any.
|
||
defs' =
|
||
(optional (opt ? default)
|
||
{ file = head opt.declarations; value = mkOptionDefault opt.default; }) ++ defs;
|
||
|
||
# Handle properties, check types, and merge everything together.
|
||
res =
|
||
if opt.readOnly or false && length defs' > 1 then
|
||
let
|
||
# For a better error message, evaluate all readOnly definitions as
|
||
# if they were the only definition.
|
||
separateDefs = map (def: def // {
|
||
value = (mergeDefinitions loc opt.type [ def ]).mergedValue;
|
||
}) defs';
|
||
in throw "The option `${showOption loc}' is read-only, but it's set multiple times. Definition values:${showDefs separateDefs}"
|
||
else
|
||
mergeDefinitions loc opt.type defs';
|
||
|
||
# Apply the 'apply' function to the merged value. This allows options to
|
||
# yield a value computed from the definitions
|
||
value = if opt ? apply then opt.apply res.mergedValue else res.mergedValue;
|
||
|
||
warnDeprecation =
|
||
warnIf (opt.type.deprecationMessage != null)
|
||
"The type `types.${opt.type.name}' of option `${showOption loc}' defined in ${showFiles opt.declarations} is deprecated. ${opt.type.deprecationMessage}";
|
||
|
||
in warnDeprecation opt //
|
||
{ value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
|
||
inherit (res.defsFinal') highestPrio;
|
||
definitions = map (def: def.value) res.defsFinal;
|
||
files = map (def: def.file) res.defsFinal;
|
||
definitionsWithLocations = res.defsFinal;
|
||
inherit (res) isDefined;
|
||
# This allows options to be correctly displayed using `${options.path.to.it}`
|
||
__toString = _: showOption loc;
|
||
};
|
||
|
||
# Merge definitions of a value of a given type.
|
||
mergeDefinitions = loc: type: defs: rec {
|
||
defsFinal' =
|
||
let
|
||
# Process mkMerge and mkIf properties.
|
||
defs' = concatMap (m:
|
||
map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
|
||
) defs;
|
||
|
||
# Process mkOverride properties.
|
||
defs'' = filterOverrides' defs';
|
||
|
||
# Sort mkOrder properties.
|
||
defs''' =
|
||
# Avoid sorting if we don't have to.
|
||
if any (def: def.value._type or "" == "order") defs''.values
|
||
then sortProperties defs''.values
|
||
else defs''.values;
|
||
in {
|
||
values = defs''';
|
||
inherit (defs'') highestPrio;
|
||
};
|
||
defsFinal = defsFinal'.values;
|
||
|
||
# Type-check the remaining definitions, and merge them. Or throw if no definitions.
|
||
mergedValue =
|
||
if isDefined then
|
||
if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
|
||
else let allInvalid = filter (def: ! type.check def.value) defsFinal;
|
||
in throw "A definition for option `${showOption loc}' is not of type `${type.description}'. Definition values:${showDefs allInvalid}"
|
||
else
|
||
# (nixos-option detects this specific error message and gives it special
|
||
# handling. If changed here, please change it there too.)
|
||
throw "The option `${showOption loc}' is used but not defined.";
|
||
|
||
isDefined = defsFinal != [];
|
||
|
||
optionalValue =
|
||
if isDefined then { value = mergedValue; }
|
||
else {};
|
||
};
|
||
|
||
/* Given a config set, expand mkMerge properties, and push down the
|
||
other properties into the children. The result is a list of
|
||
config sets that do not have properties at top-level. For
|
||
example,
|
||
|
||
mkMerge [ { boot = set1; } (mkIf cond { boot = set2; services = set3; }) ]
|
||
|
||
is transformed into
|
||
|
||
[ { boot = set1; } { boot = mkIf cond set2; services = mkIf cond set3; } ].
|
||
|
||
This transform is the critical step that allows mkIf conditions
|
||
to refer to the full configuration without creating an infinite
|
||
recursion.
|
||
*/
|
||
pushDownProperties = cfg:
|
||
if cfg._type or "" == "merge" then
|
||
concatMap pushDownProperties cfg.contents
|
||
else if cfg._type or "" == "if" then
|
||
map (mapAttrs (n: v: mkIf cfg.condition v)) (pushDownProperties cfg.content)
|
||
else if cfg._type or "" == "override" then
|
||
map (mapAttrs (n: v: mkOverride cfg.priority v)) (pushDownProperties cfg.content)
|
||
else # FIXME: handle mkOrder?
|
||
[ cfg ];
|
||
|
||
/* Given a config value, expand mkMerge properties, and discharge
|
||
any mkIf conditions. That is, this is the place where mkIf
|
||
conditions are actually evaluated. The result is a list of
|
||
config values. For example, ‘mkIf false x’ yields ‘[]’,
|
||
‘mkIf true x’ yields ‘[x]’, and
|
||
|
||
mkMerge [ 1 (mkIf true 2) (mkIf true (mkIf false 3)) ]
|
||
|
||
yields ‘[ 1 2 ]’.
|
||
*/
|
||
dischargeProperties = def:
|
||
if def._type or "" == "merge" then
|
||
concatMap dischargeProperties def.contents
|
||
else if def._type or "" == "if" then
|
||
if isBool def.condition then
|
||
if def.condition then
|
||
dischargeProperties def.content
|
||
else
|
||
[ ]
|
||
else
|
||
throw "‘mkIf’ called with a non-Boolean condition"
|
||
else
|
||
[ def ];
|
||
|
||
/* Given a list of config values, process the mkOverride properties,
|
||
that is, return the values that have the highest (that is,
|
||
numerically lowest) priority, and strip the mkOverride
|
||
properties. For example,
|
||
|
||
[ { file = "/1"; value = mkOverride 10 "a"; }
|
||
{ file = "/2"; value = mkOverride 20 "b"; }
|
||
{ file = "/3"; value = "z"; }
|
||
{ file = "/4"; value = mkOverride 10 "d"; }
|
||
]
|
||
|
||
yields
|
||
|
||
[ { file = "/1"; value = "a"; }
|
||
{ file = "/4"; value = "d"; }
|
||
]
|
||
|
||
Note that "z" has the default priority 100.
|
||
*/
|
||
filterOverrides = defs: (filterOverrides' defs).values;
|
||
|
||
filterOverrides' = defs:
|
||
let
|
||
getPrio = def: if def.value._type or "" == "override" then def.value.priority else defaultOverridePriority;
|
||
highestPrio = foldl' (prio: def: min (getPrio def) prio) 9999 defs;
|
||
strip = def: if def.value._type or "" == "override" then def // { value = def.value.content; } else def;
|
||
in {
|
||
values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
|
||
inherit highestPrio;
|
||
};
|
||
|
||
/* Sort a list of properties. The sort priority of a property is
|
||
defaultOrderPriority by default, but can be overridden by wrapping the property
|
||
using mkOrder. */
|
||
sortProperties = defs:
|
||
let
|
||
strip = def:
|
||
if def.value._type or "" == "order"
|
||
then def // { value = def.value.content; inherit (def.value) priority; }
|
||
else def;
|
||
defs' = map strip defs;
|
||
compare = a: b: (a.priority or defaultOrderPriority) < (b.priority or defaultOrderPriority);
|
||
in sort compare defs';
|
||
|
||
# This calls substSubModules, whose entire purpose is only to ensure that
|
||
# option declarations in submodules have accurate position information.
|
||
# TODO: Merge this into mergeOptionDecls
|
||
fixupOptionType = loc: opt:
|
||
if opt.type.getSubModules or null == null
|
||
then opt // { type = opt.type or types.unspecified; }
|
||
else opt // { type = opt.type.substSubModules opt.options; options = []; };
|
||
|
||
|
||
/* Properties. */
|
||
|
||
mkIf = condition: content:
|
||
{ _type = "if";
|
||
inherit condition content;
|
||
};
|
||
|
||
mkAssert = assertion: message: content:
|
||
mkIf
|
||
(if assertion then true else throw "\nFailed assertion: ${message}")
|
||
content;
|
||
|
||
mkMerge = contents:
|
||
{ _type = "merge";
|
||
inherit contents;
|
||
};
|
||
|
||
mkOverride = priority: content:
|
||
{ _type = "override";
|
||
inherit priority content;
|
||
};
|
||
|
||
mkOptionDefault = mkOverride 1500; # priority of option defaults
|
||
mkDefault = mkOverride 1000; # used in config sections of non-user modules to set a default
|
||
defaultOverridePriority = 100;
|
||
mkImageMediaOverride = mkOverride 60; # image media profiles can be derived by inclusion into host config, hence needing to override host config, but do allow user to mkForce
|
||
mkForce = mkOverride 50;
|
||
mkVMOverride = mkOverride 10; # used by ‘nixos-rebuild build-vm’
|
||
|
||
defaultPriority = lib.warnIf (lib.isInOldestRelease 2305) "lib.modules.defaultPriority is deprecated, please use lib.modules.defaultOverridePriority instead." defaultOverridePriority;
|
||
|
||
mkFixStrictness = lib.warn "lib.mkFixStrictness has no effect and will be removed. It returns its argument unmodified, so you can just remove any calls." id;
|
||
|
||
mkOrder = priority: content:
|
||
{ _type = "order";
|
||
inherit priority content;
|
||
};
|
||
|
||
mkBefore = mkOrder 500;
|
||
defaultOrderPriority = 1000;
|
||
mkAfter = mkOrder 1500;
|
||
|
||
# Convenient property used to transfer all definitions and their
|
||
# properties from one option to another. This property is useful for
|
||
# renaming options, and also for including properties from another module
|
||
# system, including sub-modules.
|
||
#
|
||
# { config, options, ... }:
|
||
#
|
||
# {
|
||
# # 'bar' might not always be defined in the current module-set.
|
||
# config.foo.enable = mkAliasDefinitions (options.bar.enable or {});
|
||
#
|
||
# # 'barbaz' has to be defined in the current module-set.
|
||
# config.foobar.paths = mkAliasDefinitions options.barbaz.paths;
|
||
# }
|
||
#
|
||
# Note, this is different than taking the value of the option and using it
|
||
# as a definition, as the new definition will not keep the mkOverride /
|
||
# mkDefault properties of the previous option.
|
||
#
|
||
mkAliasDefinitions = mkAliasAndWrapDefinitions id;
|
||
mkAliasAndWrapDefinitions = wrap: option:
|
||
mkAliasIfDef option (wrap (mkMerge option.definitions));
|
||
|
||
# Similar to mkAliasAndWrapDefinitions but copies over the priority from the
|
||
# option as well.
|
||
#
|
||
# If a priority is not set, it assumes a priority of defaultOverridePriority.
|
||
mkAliasAndWrapDefsWithPriority = wrap: option:
|
||
let
|
||
prio = option.highestPrio or defaultOverridePriority;
|
||
defsWithPrio = map (mkOverride prio) option.definitions;
|
||
in mkAliasIfDef option (wrap (mkMerge defsWithPrio));
|
||
|
||
mkAliasIfDef = option:
|
||
mkIf (isOption option && option.isDefined);
|
||
|
||
/* Compatibility. */
|
||
fixMergeModules = modules: args: evalModules { inherit modules args; check = false; };
|
||
|
||
|
||
/* Return a module that causes a warning to be shown if the
|
||
specified option is defined. For example,
|
||
|
||
mkRemovedOptionModule [ "boot" "loader" "grub" "bootDevice" ] "<replacement instructions>"
|
||
|
||
causes a assertion if the user defines boot.loader.grub.bootDevice.
|
||
|
||
replacementInstructions is a string that provides instructions on
|
||
how to achieve the same functionality without the removed option,
|
||
or alternatively a reasoning why the functionality is not needed.
|
||
replacementInstructions SHOULD be provided!
|
||
*/
|
||
mkRemovedOptionModule = optionName: replacementInstructions:
|
||
{ options, ... }:
|
||
{ options = setAttrByPath optionName (mkOption {
|
||
visible = false;
|
||
apply = x: throw "The option `${showOption optionName}' can no longer be used since it's been removed. ${replacementInstructions}";
|
||
});
|
||
config.assertions =
|
||
let opt = getAttrFromPath optionName options; in [{
|
||
assertion = !opt.isDefined;
|
||
message = ''
|
||
The option definition `${showOption optionName}' in ${showFiles opt.files} no longer has any effect; please remove it.
|
||
${replacementInstructions}
|
||
'';
|
||
}];
|
||
};
|
||
|
||
/* Return a module that causes a warning to be shown if the
|
||
specified "from" option is defined; the defined value is however
|
||
forwarded to the "to" option. This can be used to rename options
|
||
while providing backward compatibility. For example,
|
||
|
||
mkRenamedOptionModule [ "boot" "copyKernels" ] [ "boot" "loader" "grub" "copyKernels" ]
|
||
|
||
forwards any definitions of boot.copyKernels to
|
||
boot.loader.grub.copyKernels while printing a warning.
|
||
|
||
This also copies over the priority from the aliased option to the
|
||
non-aliased option.
|
||
*/
|
||
mkRenamedOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = false;
|
||
warn = true;
|
||
use = builtins.trace "Obsolete option `${showOption from}' is used. It was renamed to `${showOption to}'.";
|
||
};
|
||
|
||
mkRenamedOptionModuleWith = {
|
||
/* Old option path as list of strings. */
|
||
from,
|
||
/* New option path as list of strings. */
|
||
to,
|
||
|
||
/*
|
||
Release number of the first release that contains the rename, ignoring backports.
|
||
Set it to the upcoming release, matching the nixpkgs/.version file.
|
||
*/
|
||
sinceRelease,
|
||
|
||
}: doRename {
|
||
inherit from to;
|
||
visible = false;
|
||
warn = lib.isInOldestRelease sinceRelease;
|
||
use = lib.warnIf (lib.isInOldestRelease sinceRelease)
|
||
"Obsolete option `${showOption from}' is used. It was renamed to `${showOption to}'.";
|
||
};
|
||
|
||
/* Return a module that causes a warning to be shown if any of the "from"
|
||
option is defined; the defined values can be used in the "mergeFn" to set
|
||
the "to" value.
|
||
This function can be used to merge multiple options into one that has a
|
||
different type.
|
||
|
||
"mergeFn" takes the module "config" as a parameter and must return a value
|
||
of "to" option type.
|
||
|
||
mkMergedOptionModule
|
||
[ [ "a" "b" "c" ]
|
||
[ "d" "e" "f" ] ]
|
||
[ "x" "y" "z" ]
|
||
(config:
|
||
let value = p: getAttrFromPath p config;
|
||
in
|
||
if (value [ "a" "b" "c" ]) == true then "foo"
|
||
else if (value [ "d" "e" "f" ]) == true then "bar"
|
||
else "baz")
|
||
|
||
- options.a.b.c is a removed boolean option
|
||
- options.d.e.f is a removed boolean option
|
||
- options.x.y.z is a new str option that combines a.b.c and d.e.f
|
||
functionality
|
||
|
||
This show a warning if any a.b.c or d.e.f is set, and set the value of
|
||
x.y.z to the result of the merge function
|
||
*/
|
||
mkMergedOptionModule = from: to: mergeFn:
|
||
{ config, options, ... }:
|
||
{
|
||
options = foldl' recursiveUpdate {} (map (path: setAttrByPath path (mkOption {
|
||
visible = false;
|
||
# To use the value in mergeFn without triggering errors
|
||
default = "_mkMergedOptionModule";
|
||
})) from);
|
||
|
||
config = {
|
||
warnings = filter (x: x != "") (map (f:
|
||
let val = getAttrFromPath f config;
|
||
opt = getAttrFromPath f options;
|
||
in
|
||
optionalString
|
||
(val != "_mkMergedOptionModule")
|
||
"The option `${showOption f}' defined in ${showFiles opt.files} has been changed to `${showOption to}' that has a different type. Please read `${showOption to}' documentation and update your configuration accordingly."
|
||
) from);
|
||
} // setAttrByPath to (mkMerge
|
||
(optional
|
||
(any (f: (getAttrFromPath f config) != "_mkMergedOptionModule") from)
|
||
(mergeFn config)));
|
||
};
|
||
|
||
/* Single "from" version of mkMergedOptionModule.
|
||
Return a module that causes a warning to be shown if the "from" option is
|
||
defined; the defined value can be used in the "mergeFn" to set the "to"
|
||
value.
|
||
This function can be used to change an option into another that has a
|
||
different type.
|
||
|
||
"mergeFn" takes the module "config" as a parameter and must return a value of
|
||
"to" option type.
|
||
|
||
mkChangedOptionModule [ "a" "b" "c" ] [ "x" "y" "z" ]
|
||
(config:
|
||
let value = getAttrFromPath [ "a" "b" "c" ] config;
|
||
in
|
||
if value > 100 then "high"
|
||
else "normal")
|
||
|
||
- options.a.b.c is a removed int option
|
||
- options.x.y.z is a new str option that supersedes a.b.c
|
||
|
||
This show a warning if a.b.c is set, and set the value of x.y.z to the
|
||
result of the change function
|
||
*/
|
||
mkChangedOptionModule = from: to: changeFn:
|
||
mkMergedOptionModule [ from ] to changeFn;
|
||
|
||
/* Like ‘mkRenamedOptionModule’, but doesn't show a warning. */
|
||
mkAliasOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = true;
|
||
warn = false;
|
||
use = id;
|
||
};
|
||
|
||
/* mkDerivedConfig : Option a -> (a -> Definition b) -> Definition b
|
||
|
||
Create config definitions with the same priority as the definition of another option.
|
||
This should be used for option definitions where one option sets the value of another as a convenience.
|
||
For instance a config file could be set with a `text` or `source` option, where text translates to a `source`
|
||
value using `mkDerivedConfig options.text (pkgs.writeText "filename.conf")`.
|
||
|
||
It takes care of setting the right priority using `mkOverride`.
|
||
*/
|
||
# TODO: make the module system error message include information about `opt` in
|
||
# error messages about conflicts. E.g. introduce a variation of `mkOverride` which
|
||
# adds extra location context to the definition object. This will allow context to be added
|
||
# to all messages that report option locations "this value was derived from <full option name>
|
||
# which was defined in <locations>". It can provide a trace of options that contributed
|
||
# to definitions.
|
||
mkDerivedConfig = opt: f:
|
||
mkOverride
|
||
(opt.highestPrio or defaultOverridePriority)
|
||
(f opt.value);
|
||
|
||
doRename = { from, to, visible, warn, use, withPriority ? true }:
|
||
{ config, options, ... }:
|
||
let
|
||
fromOpt = getAttrFromPath from options;
|
||
toOf = attrByPath to
|
||
(abort "Renaming error: option `${showOption to}' does not exist.");
|
||
toType = let opt = attrByPath to {} options; in opt.type or (types.submodule {});
|
||
in
|
||
{
|
||
options = setAttrByPath from (mkOption {
|
||
inherit visible;
|
||
description = lib.mdDoc "Alias of {option}`${showOption to}`.";
|
||
apply = x: use (toOf config);
|
||
} // optionalAttrs (toType != null) {
|
||
type = toType;
|
||
});
|
||
config = mkMerge [
|
||
(optionalAttrs (options ? warnings) {
|
||
warnings = optional (warn && fromOpt.isDefined)
|
||
"The option `${showOption from}' defined in ${showFiles fromOpt.files} has been renamed to `${showOption to}'.";
|
||
})
|
||
(if withPriority
|
||
then mkAliasAndWrapDefsWithPriority (setAttrByPath to) fromOpt
|
||
else mkAliasAndWrapDefinitions (setAttrByPath to) fromOpt)
|
||
];
|
||
};
|
||
|
||
/* Use this function to import a JSON file as NixOS configuration.
|
||
|
||
modules.importJSON :: path -> attrs
|
||
*/
|
||
importJSON = file: {
|
||
_file = file;
|
||
config = lib.importJSON file;
|
||
};
|
||
|
||
/* Use this function to import a TOML file as NixOS configuration.
|
||
|
||
modules.importTOML :: path -> attrs
|
||
*/
|
||
importTOML = file: {
|
||
_file = file;
|
||
config = lib.importTOML file;
|
||
};
|
||
}
|