mirror of
https://github.com/NixOS/nixpkgs.git
synced 2024-11-22 06:53:01 +00:00
e5e69b748f
Previously, for values of type list, the merge function would only retain the value if the number of option definitions was less than or equal to 1, and would throw an error for conflicting definitions to avoid potentially unwanted list merges. This change removes that logic, defaulting to the 'mergeEqualOption' function for values of type list. This approach maintains the same safeguard against merging different lists while allowing lists with identical values to be merged.
1045 lines
40 KiB
Nix
1045 lines
40 KiB
Nix
# Definitions related to run-time type checking. Used in particular
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# to type-check NixOS configurations.
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{ lib }:
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let
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inherit (lib)
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elem
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flip
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isAttrs
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isBool
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isDerivation
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isFloat
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isFunction
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isInt
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isList
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isString
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isStorePath
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throwIf
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toDerivation
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toList
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;
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inherit (lib.lists)
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all
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concatLists
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count
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elemAt
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filter
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foldl'
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head
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imap1
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last
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length
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tail
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;
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inherit (lib.attrsets)
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attrNames
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filterAttrs
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hasAttr
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mapAttrs
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optionalAttrs
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zipAttrsWith
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;
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inherit (lib.options)
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getFiles
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getValues
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mergeDefaultOption
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mergeEqualOption
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mergeOneOption
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mergeUniqueOption
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showFiles
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showOption
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;
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inherit (lib.strings)
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concatMapStringsSep
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concatStringsSep
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escapeNixString
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hasInfix
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isStringLike
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;
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inherit (lib.trivial)
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boolToString
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;
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inherit (lib.modules)
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mergeDefinitions
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fixupOptionType
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mergeOptionDecls
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;
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inAttrPosSuffix = v: name:
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let pos = builtins.unsafeGetAttrPos name v; in
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if pos == null then "" else " at ${pos.file}:${toString pos.line}:${toString pos.column}";
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outer_types =
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rec {
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isType = type: x: (x._type or "") == type;
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setType = typeName: value: value // {
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_type = typeName;
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};
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# Default type merging function
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# takes two type functors and return the merged type
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defaultTypeMerge = f: f':
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let wrapped = f.wrapped.typeMerge f'.wrapped.functor;
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payload = f.binOp f.payload f'.payload;
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in
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# cannot merge different types
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if f.name != f'.name
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then null
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# simple types
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else if (f.wrapped == null && f'.wrapped == null)
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&& (f.payload == null && f'.payload == null)
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then f.type
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# composed types
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else if (f.wrapped != null && f'.wrapped != null) && (wrapped != null)
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then f.type wrapped
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# value types
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else if (f.payload != null && f'.payload != null) && (payload != null)
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then f.type payload
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else null;
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# Default type functor
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defaultFunctor = name: {
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inherit name;
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type = types.${name} or null;
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wrapped = null;
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payload = null;
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binOp = a: b: null;
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};
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isOptionType = isType "option-type";
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mkOptionType =
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{ # Human-readable representation of the type, should be equivalent to
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# the type function name.
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name
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, # Description of the type, defined recursively by embedding the wrapped type if any.
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description ? null
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# A hint for whether or not this description needs parentheses. Possible values:
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# - "noun": a noun phrase
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# Example description: "positive integer",
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# - "conjunction": a phrase with a potentially ambiguous "or" connective
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# Example description: "int or string"
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# - "composite": a phrase with an "of" connective
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# Example description: "list of string"
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# - "nonRestrictiveClause": a noun followed by a comma and a clause
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# Example description: "positive integer, meaning >0"
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# See the `optionDescriptionPhrase` function.
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, descriptionClass ? null
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, # DO NOT USE WITHOUT KNOWING WHAT YOU ARE DOING!
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# Function applied to each definition that must return false when a definition
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# does not match the type. It should not check more than the root of the value,
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# because checking nested values reduces laziness, leading to unnecessary
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# infinite recursions in the module system.
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# Further checks of nested values should be performed by throwing in
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# the merge function.
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# Strict and deep type checking can be performed by calling lib.deepSeq on
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# the merged value.
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#
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# See https://github.com/NixOS/nixpkgs/pull/6794 that introduced this change,
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# https://github.com/NixOS/nixpkgs/pull/173568 and
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# https://github.com/NixOS/nixpkgs/pull/168295 that attempted to revert this,
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# https://github.com/NixOS/nixpkgs/issues/191124 and
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# https://github.com/NixOS/nixos-search/issues/391 for what happens if you ignore
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# this disclaimer.
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check ? (x: true)
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, # Merge a list of definitions together into a single value.
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# This function is called with two arguments: the location of
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# the option in the configuration as a list of strings
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# (e.g. ["boot" "loader "grub" "enable"]), and a list of
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# definition values and locations (e.g. [ { file = "/foo.nix";
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# value = 1; } { file = "/bar.nix"; value = 2 } ]).
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merge ? mergeDefaultOption
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, # Whether this type has a value representing nothingness. If it does,
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# this should be a value of the form { value = <the nothing value>; }
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# If it doesn't, this should be {}
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# This may be used when a value is required for `mkIf false`. This allows the extra laziness in e.g. `lazyAttrsOf`.
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emptyValue ? {}
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, # Return a flat attrset of sub-options. Used to generate
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# documentation.
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getSubOptions ? prefix: {}
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, # List of modules if any, or null if none.
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getSubModules ? null
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, # Function for building the same option type with a different list of
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# modules.
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substSubModules ? m: null
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, # Function that merge type declarations.
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# internal, takes a functor as argument and returns the merged type.
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# returning null means the type is not mergeable
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typeMerge ? defaultTypeMerge functor
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, # The type functor.
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# internal, representation of the type as an attribute set.
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# name: name of the type
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# type: type function.
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# wrapped: the type wrapped in case of compound types.
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# payload: values of the type, two payloads of the same type must be
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# combinable with the binOp binary operation.
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# binOp: binary operation that merge two payloads of the same type.
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functor ? defaultFunctor name
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, # The deprecation message to display when this type is used by an option
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# If null, the type isn't deprecated
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deprecationMessage ? null
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, # The types that occur in the definition of this type. This is used to
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# issue deprecation warnings recursively. Can also be used to reuse
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# nested types
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nestedTypes ? {}
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}:
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{ _type = "option-type";
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inherit
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name check merge emptyValue getSubOptions getSubModules substSubModules
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typeMerge functor deprecationMessage nestedTypes descriptionClass;
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description = if description == null then name else description;
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};
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# optionDescriptionPhrase :: (str -> bool) -> optionType -> str
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#
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# Helper function for producing unambiguous but readable natural language
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# descriptions of types.
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#
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# Parameters
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#
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# optionDescriptionPhase unparenthesize optionType
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#
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# `unparenthesize`: A function from descriptionClass string to boolean.
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# It must return true when the class of phrase will fit unambiguously into
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# the description of the caller.
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#
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# `optionType`: The option type to parenthesize or not.
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# The option whose description we're returning.
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#
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# Return value
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#
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# The description of the `optionType`, with parentheses if there may be an
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# ambiguity.
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optionDescriptionPhrase = unparenthesize: t:
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if unparenthesize (t.descriptionClass or null)
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then t.description
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else "(${t.description})";
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# When adding new types don't forget to document them in
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# nixos/doc/manual/development/option-types.section.md!
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types = rec {
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raw = mkOptionType {
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name = "raw";
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description = "raw value";
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descriptionClass = "noun";
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check = value: true;
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merge = mergeOneOption;
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};
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anything = mkOptionType {
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name = "anything";
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description = "anything";
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descriptionClass = "noun";
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check = value: true;
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merge = loc: defs:
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let
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getType = value:
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if isAttrs value && isStringLike value
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then "stringCoercibleSet"
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else builtins.typeOf value;
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# Returns the common type of all definitions, throws an error if they
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# don't have the same type
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commonType = foldl' (type: def:
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if getType def.value == type
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then type
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else throw "The option `${showOption loc}' has conflicting option types in ${showFiles (getFiles defs)}"
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) (getType (head defs).value) defs;
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mergeFunction = {
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# Recursively merge attribute sets
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set = (attrsOf anything).merge;
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# This is the type of packages, only accept a single definition
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stringCoercibleSet = mergeOneOption;
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lambda = loc: defs: arg: anything.merge
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(loc ++ [ "<function body>" ])
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(map (def: {
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file = def.file;
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value = def.value arg;
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}) defs);
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# Otherwise fall back to only allowing all equal definitions
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}.${commonType} or mergeEqualOption;
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in mergeFunction loc defs;
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};
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unspecified = mkOptionType {
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name = "unspecified";
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description = "unspecified value";
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descriptionClass = "noun";
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};
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bool = mkOptionType {
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name = "bool";
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description = "boolean";
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descriptionClass = "noun";
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check = isBool;
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merge = mergeEqualOption;
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};
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boolByOr = mkOptionType {
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name = "boolByOr";
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description = "boolean (merged using or)";
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descriptionClass = "noun";
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check = isBool;
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merge = loc: defs:
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foldl'
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(result: def:
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# Under the assumption that .check always runs before merge, we can assume that all defs.*.value
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# have been forced, and therefore we assume we don't introduce order-dependent strictness here
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result || def.value
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)
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false
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defs;
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};
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int = mkOptionType {
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name = "int";
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description = "signed integer";
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descriptionClass = "noun";
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check = isInt;
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merge = mergeEqualOption;
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};
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# Specialized subdomains of int
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ints =
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let
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betweenDesc = lowest: highest:
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"${toString lowest} and ${toString highest} (both inclusive)";
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between = lowest: highest:
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assert lib.assertMsg (lowest <= highest)
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"ints.between: lowest must be smaller than highest";
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addCheck int (x: x >= lowest && x <= highest) // {
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name = "intBetween";
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description = "integer between ${betweenDesc lowest highest}";
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};
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ign = lowest: highest: name: docStart:
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between lowest highest // {
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inherit name;
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description = docStart + "; between ${betweenDesc lowest highest}";
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};
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unsign = bit: range: ign 0 (range - 1)
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"unsignedInt${toString bit}" "${toString bit} bit unsigned integer";
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sign = bit: range: ign (0 - (range / 2)) (range / 2 - 1)
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"signedInt${toString bit}" "${toString bit} bit signed integer";
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in {
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# TODO: Deduplicate with docs in nixos/doc/manual/development/option-types.section.md
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/**
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An int with a fixed range.
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# Example
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:::{.example}
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## `lib.types.ints.between` usage example
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```nix
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(ints.between 0 100).check (-1)
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=> false
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(ints.between 0 100).check (101)
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=> false
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(ints.between 0 0).check 0
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=> true
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```
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|
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:::
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*/
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inherit between;
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unsigned = addCheck types.int (x: x >= 0) // {
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name = "unsignedInt";
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description = "unsigned integer, meaning >=0";
|
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descriptionClass = "nonRestrictiveClause";
|
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};
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positive = addCheck types.int (x: x > 0) // {
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name = "positiveInt";
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description = "positive integer, meaning >0";
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descriptionClass = "nonRestrictiveClause";
|
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};
|
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u8 = unsign 8 256;
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u16 = unsign 16 65536;
|
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# the biggest int Nix accepts is 2^63 - 1 (9223372036854775808)
|
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# the smallest int Nix accepts is -2^63 (-9223372036854775807)
|
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u32 = unsign 32 4294967296;
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# u64 = unsign 64 18446744073709551616;
|
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|
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s8 = sign 8 256;
|
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s16 = sign 16 65536;
|
||
s32 = sign 32 4294967296;
|
||
};
|
||
|
||
# Alias of u16 for a port number
|
||
port = ints.u16;
|
||
|
||
float = mkOptionType {
|
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name = "float";
|
||
description = "floating point number";
|
||
descriptionClass = "noun";
|
||
check = isFloat;
|
||
merge = mergeEqualOption;
|
||
};
|
||
|
||
number = either int float;
|
||
|
||
numbers = let
|
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betweenDesc = lowest: highest:
|
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"${builtins.toJSON lowest} and ${builtins.toJSON highest} (both inclusive)";
|
||
in {
|
||
between = lowest: highest:
|
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assert lib.assertMsg (lowest <= highest)
|
||
"numbers.between: lowest must be smaller than highest";
|
||
addCheck number (x: x >= lowest && x <= highest) // {
|
||
name = "numberBetween";
|
||
description = "integer or floating point number between ${betweenDesc lowest highest}";
|
||
};
|
||
|
||
nonnegative = addCheck number (x: x >= 0) // {
|
||
name = "numberNonnegative";
|
||
description = "nonnegative integer or floating point number, meaning >=0";
|
||
descriptionClass = "nonRestrictiveClause";
|
||
};
|
||
positive = addCheck number (x: x > 0) // {
|
||
name = "numberPositive";
|
||
description = "positive integer or floating point number, meaning >0";
|
||
descriptionClass = "nonRestrictiveClause";
|
||
};
|
||
};
|
||
|
||
str = mkOptionType {
|
||
name = "str";
|
||
description = "string";
|
||
descriptionClass = "noun";
|
||
check = isString;
|
||
merge = mergeEqualOption;
|
||
};
|
||
|
||
nonEmptyStr = mkOptionType {
|
||
name = "nonEmptyStr";
|
||
description = "non-empty string";
|
||
descriptionClass = "noun";
|
||
check = x: str.check x && builtins.match "[ \t\n]*" x == null;
|
||
inherit (str) merge;
|
||
};
|
||
|
||
# Allow a newline character at the end and trim it in the merge function.
|
||
singleLineStr =
|
||
let
|
||
inherit (strMatching "[^\n\r]*\n?") check merge;
|
||
in
|
||
mkOptionType {
|
||
name = "singleLineStr";
|
||
description = "(optionally newline-terminated) single-line string";
|
||
descriptionClass = "noun";
|
||
inherit check;
|
||
merge = loc: defs:
|
||
lib.removeSuffix "\n" (merge loc defs);
|
||
};
|
||
|
||
strMatching = pattern: mkOptionType {
|
||
name = "strMatching ${escapeNixString pattern}";
|
||
description = "string matching the pattern ${pattern}";
|
||
descriptionClass = "noun";
|
||
check = x: str.check x && builtins.match pattern x != null;
|
||
inherit (str) merge;
|
||
};
|
||
|
||
# Merge multiple definitions by concatenating them (with the given
|
||
# separator between the values).
|
||
separatedString = sep: mkOptionType rec {
|
||
name = "separatedString";
|
||
description = if sep == ""
|
||
then "Concatenated string" # for types.string.
|
||
else "strings concatenated with ${builtins.toJSON sep}"
|
||
;
|
||
descriptionClass = "noun";
|
||
check = isString;
|
||
merge = loc: defs: concatStringsSep sep (getValues defs);
|
||
functor = (defaultFunctor name) // {
|
||
payload = sep;
|
||
binOp = sepLhs: sepRhs:
|
||
if sepLhs == sepRhs then sepLhs
|
||
else null;
|
||
};
|
||
};
|
||
|
||
lines = separatedString "\n";
|
||
commas = separatedString ",";
|
||
envVar = separatedString ":";
|
||
|
||
# Deprecated; should not be used because it quietly concatenates
|
||
# strings, which is usually not what you want.
|
||
# We use a lib.warn because `deprecationMessage` doesn't trigger in nested types such as `attrsOf string`
|
||
string = lib.warn
|
||
"The type `types.string` is deprecated. See https://github.com/NixOS/nixpkgs/pull/66346 for better alternative types."
|
||
(separatedString "" // {
|
||
name = "string";
|
||
});
|
||
|
||
passwdEntry = entryType: addCheck entryType (str: !(hasInfix ":" str || hasInfix "\n" str)) // {
|
||
name = "passwdEntry ${entryType.name}";
|
||
description = "${optionDescriptionPhrase (class: class == "noun") entryType}, not containing newlines or colons";
|
||
descriptionClass = "nonRestrictiveClause";
|
||
};
|
||
|
||
attrs = mkOptionType {
|
||
name = "attrs";
|
||
description = "attribute set";
|
||
check = isAttrs;
|
||
merge = loc: foldl' (res: def: res // def.value) {};
|
||
emptyValue = { value = {}; };
|
||
};
|
||
|
||
# A package is a top-level store path (/nix/store/hash-name). This includes:
|
||
# - derivations
|
||
# - more generally, attribute sets with an `outPath` or `__toString` attribute
|
||
# pointing to a store path, e.g. flake inputs
|
||
# - strings with context, e.g. "${pkgs.foo}" or (toString pkgs.foo)
|
||
# - hardcoded store path literals (/nix/store/hash-foo) or strings without context
|
||
# ("/nix/store/hash-foo"). These get a context added to them using builtins.storePath.
|
||
# If you don't need a *top-level* store path, consider using pathInStore instead.
|
||
package = mkOptionType {
|
||
name = "package";
|
||
descriptionClass = "noun";
|
||
check = x: isDerivation x || isStorePath x;
|
||
merge = loc: defs:
|
||
let res = mergeOneOption loc defs;
|
||
in if builtins.isPath res || (builtins.isString res && ! builtins.hasContext res)
|
||
then toDerivation res
|
||
else res;
|
||
};
|
||
|
||
shellPackage = package // {
|
||
check = x: isDerivation x && hasAttr "shellPath" x;
|
||
};
|
||
|
||
pkgs = addCheck
|
||
(unique { message = "A Nixpkgs pkgs set can not be merged with another pkgs set."; } attrs // {
|
||
name = "pkgs";
|
||
descriptionClass = "noun";
|
||
description = "Nixpkgs package set";
|
||
})
|
||
(x: (x._type or null) == "pkgs");
|
||
|
||
path = mkOptionType {
|
||
name = "path";
|
||
descriptionClass = "noun";
|
||
check = x: isStringLike x && builtins.substring 0 1 (toString x) == "/";
|
||
merge = mergeEqualOption;
|
||
};
|
||
|
||
pathInStore = mkOptionType {
|
||
name = "pathInStore";
|
||
description = "path in the Nix store";
|
||
descriptionClass = "noun";
|
||
check = x: isStringLike x && builtins.match "${builtins.storeDir}/[^.].*" (toString x) != null;
|
||
merge = mergeEqualOption;
|
||
};
|
||
|
||
listOf = elemType: mkOptionType rec {
|
||
name = "listOf";
|
||
description = "list of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
|
||
descriptionClass = "composite";
|
||
check = isList;
|
||
merge = loc: defs:
|
||
map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
|
||
imap1 (m: def':
|
||
(mergeDefinitions
|
||
(loc ++ ["[definition ${toString n}-entry ${toString m}]"])
|
||
elemType
|
||
[{ inherit (def) file; value = def'; }]
|
||
).optionalValue
|
||
) def.value
|
||
) defs)));
|
||
emptyValue = { value = []; };
|
||
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["*"]);
|
||
getSubModules = elemType.getSubModules;
|
||
substSubModules = m: listOf (elemType.substSubModules m);
|
||
functor = (defaultFunctor name) // { wrapped = elemType; };
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
nonEmptyListOf = elemType:
|
||
let list = addCheck (types.listOf elemType) (l: l != []);
|
||
in list // {
|
||
description = "non-empty ${optionDescriptionPhrase (class: class == "noun") list}";
|
||
emptyValue = { }; # no .value attr, meaning unset
|
||
substSubModules = m: nonEmptyListOf (elemType.substSubModules m);
|
||
};
|
||
|
||
attrsOf = elemType: mkOptionType rec {
|
||
name = "attrsOf";
|
||
description = "attribute set of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
|
||
descriptionClass = "composite";
|
||
check = isAttrs;
|
||
merge = loc: defs:
|
||
mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
|
||
(mergeDefinitions (loc ++ [name]) elemType defs).optionalValue
|
||
)
|
||
# Push down position info.
|
||
(map (def: mapAttrs (n: v: { inherit (def) file; value = v; }) def.value) defs)));
|
||
emptyValue = { value = {}; };
|
||
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
|
||
getSubModules = elemType.getSubModules;
|
||
substSubModules = m: attrsOf (elemType.substSubModules m);
|
||
functor = (defaultFunctor name) // { wrapped = elemType; };
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
# A version of attrsOf that's lazy in its values at the expense of
|
||
# conditional definitions not working properly. E.g. defining a value with
|
||
# `foo.attr = mkIf false 10`, then `foo ? attr == true`, whereas with
|
||
# attrsOf it would correctly be `false`. Accessing `foo.attr` would throw an
|
||
# error that it's not defined. Use only if conditional definitions don't make sense.
|
||
lazyAttrsOf = elemType: mkOptionType rec {
|
||
name = "lazyAttrsOf";
|
||
description = "lazy attribute set of ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
|
||
descriptionClass = "composite";
|
||
check = isAttrs;
|
||
merge = loc: defs:
|
||
zipAttrsWith (name: defs:
|
||
let merged = mergeDefinitions (loc ++ [name]) elemType defs;
|
||
# mergedValue will trigger an appropriate error when accessed
|
||
in merged.optionalValue.value or elemType.emptyValue.value or merged.mergedValue
|
||
)
|
||
# Push down position info.
|
||
(map (def: mapAttrs (n: v: { inherit (def) file; value = v; }) def.value) defs);
|
||
emptyValue = { value = {}; };
|
||
getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
|
||
getSubModules = elemType.getSubModules;
|
||
substSubModules = m: lazyAttrsOf (elemType.substSubModules m);
|
||
functor = (defaultFunctor name) // { wrapped = elemType; };
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
# TODO: deprecate this in the future:
|
||
loaOf = elemType: types.attrsOf elemType // {
|
||
name = "loaOf";
|
||
deprecationMessage = "Mixing lists with attribute values is no longer"
|
||
+ " possible; please use `types.attrsOf` instead. See"
|
||
+ " https://github.com/NixOS/nixpkgs/issues/1800 for the motivation.";
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
attrTag = tags:
|
||
let tags_ = tags; in
|
||
let
|
||
tags =
|
||
mapAttrs
|
||
(n: opt:
|
||
builtins.addErrorContext "while checking that attrTag tag ${lib.strings.escapeNixIdentifier n} is an option with a type${inAttrPosSuffix tags_ n}" (
|
||
throwIf (opt._type or null != "option")
|
||
"In attrTag, each tag value must be an option, but tag ${lib.strings.escapeNixIdentifier n} ${
|
||
if opt?_type then
|
||
if opt._type == "option-type"
|
||
then "was a bare type, not wrapped in mkOption."
|
||
else "was of type ${lib.strings.escapeNixString opt._type}."
|
||
else "was not."}"
|
||
opt // {
|
||
declarations = opt.declarations or (
|
||
let pos = builtins.unsafeGetAttrPos n tags_;
|
||
in if pos == null then [] else [ pos.file ]
|
||
);
|
||
declarationPositions = opt.declarationPositions or (
|
||
let pos = builtins.unsafeGetAttrPos n tags_;
|
||
in if pos == null then [] else [ pos ]
|
||
);
|
||
}
|
||
))
|
||
tags_;
|
||
choicesStr = concatMapStringsSep ", " lib.strings.escapeNixIdentifier (attrNames tags);
|
||
in
|
||
mkOptionType {
|
||
name = "attrTag";
|
||
description = "attribute-tagged union";
|
||
descriptionClass = "noun";
|
||
getSubOptions = prefix:
|
||
mapAttrs
|
||
(tagName: tagOption: {
|
||
"${lib.showOption prefix}" =
|
||
tagOption // {
|
||
loc = prefix ++ [ tagName ];
|
||
};
|
||
})
|
||
tags;
|
||
check = v: isAttrs v && length (attrNames v) == 1 && tags?${head (attrNames v)};
|
||
merge = loc: defs:
|
||
let
|
||
choice = head (attrNames (head defs).value);
|
||
checkedValueDefs = map
|
||
(def:
|
||
assert (length (attrNames def.value)) == 1;
|
||
if (head (attrNames def.value)) != choice
|
||
then throw "The option `${showOption loc}` is defined both as `${choice}` and `${head (attrNames def.value)}`, in ${showFiles (getFiles defs)}."
|
||
else { inherit (def) file; value = def.value.${choice}; })
|
||
defs;
|
||
in
|
||
if tags?${choice}
|
||
then
|
||
{ ${choice} =
|
||
(lib.modules.evalOptionValue
|
||
(loc ++ [choice])
|
||
tags.${choice}
|
||
checkedValueDefs
|
||
).value;
|
||
}
|
||
else throw "The option `${showOption loc}` is defined as ${lib.strings.escapeNixIdentifier choice}, but ${lib.strings.escapeNixIdentifier choice} is not among the valid choices (${choicesStr}). Value ${choice} was defined in ${showFiles (getFiles defs)}.";
|
||
nestedTypes = tags;
|
||
functor = defaultFunctor "attrTag" // {
|
||
type = { tags, ... }: types.attrTag tags;
|
||
payload = { inherit tags; };
|
||
binOp =
|
||
let
|
||
# Add metadata in the format that submodules work with
|
||
wrapOptionDecl =
|
||
option: { options = option; _file = "<attrTag {...}>"; pos = null; };
|
||
in
|
||
a: b: {
|
||
tags = a.tags // b.tags //
|
||
mapAttrs
|
||
(tagName: bOpt:
|
||
lib.mergeOptionDecls
|
||
# FIXME: loc is not accurate; should include prefix
|
||
# Fortunately, it's only used for error messages, where a "relative" location is kinda ok.
|
||
# It is also returned though, but use of the attribute seems rare?
|
||
[tagName]
|
||
[ (wrapOptionDecl a.tags.${tagName}) (wrapOptionDecl bOpt) ]
|
||
// {
|
||
# mergeOptionDecls is not idempotent in these attrs:
|
||
declarations = a.tags.${tagName}.declarations ++ bOpt.declarations;
|
||
declarationPositions = a.tags.${tagName}.declarationPositions ++ bOpt.declarationPositions;
|
||
}
|
||
)
|
||
(builtins.intersectAttrs a.tags b.tags);
|
||
};
|
||
};
|
||
};
|
||
|
||
uniq = unique { message = ""; };
|
||
|
||
unique = { message }: type: mkOptionType rec {
|
||
name = "unique";
|
||
inherit (type) description descriptionClass check;
|
||
merge = mergeUniqueOption { inherit message; inherit (type) merge; };
|
||
emptyValue = type.emptyValue;
|
||
getSubOptions = type.getSubOptions;
|
||
getSubModules = type.getSubModules;
|
||
substSubModules = m: uniq (type.substSubModules m);
|
||
functor = (defaultFunctor name) // { wrapped = type; };
|
||
nestedTypes.elemType = type;
|
||
};
|
||
|
||
# Null or value of ...
|
||
nullOr = elemType: mkOptionType rec {
|
||
name = "nullOr";
|
||
description = "null or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") elemType}";
|
||
descriptionClass = "conjunction";
|
||
check = x: x == null || elemType.check x;
|
||
merge = loc: defs:
|
||
let nrNulls = count (def: def.value == null) defs; in
|
||
if nrNulls == length defs then null
|
||
else if nrNulls != 0 then
|
||
throw "The option `${showOption loc}` is defined both null and not null, in ${showFiles (getFiles defs)}."
|
||
else elemType.merge loc defs;
|
||
emptyValue = { value = null; };
|
||
getSubOptions = elemType.getSubOptions;
|
||
getSubModules = elemType.getSubModules;
|
||
substSubModules = m: nullOr (elemType.substSubModules m);
|
||
functor = (defaultFunctor name) // { wrapped = elemType; };
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
functionTo = elemType: mkOptionType {
|
||
name = "functionTo";
|
||
description = "function that evaluates to a(n) ${optionDescriptionPhrase (class: class == "noun" || class == "composite") elemType}";
|
||
descriptionClass = "composite";
|
||
check = isFunction;
|
||
merge = loc: defs:
|
||
fnArgs: (mergeDefinitions (loc ++ [ "<function body>" ]) elemType (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs)).mergedValue;
|
||
getSubOptions = prefix: elemType.getSubOptions (prefix ++ [ "<function body>" ]);
|
||
getSubModules = elemType.getSubModules;
|
||
substSubModules = m: functionTo (elemType.substSubModules m);
|
||
functor = (defaultFunctor "functionTo") // { wrapped = elemType; };
|
||
nestedTypes.elemType = elemType;
|
||
};
|
||
|
||
# A submodule (like typed attribute set). See NixOS manual.
|
||
submodule = modules: submoduleWith {
|
||
shorthandOnlyDefinesConfig = true;
|
||
modules = toList modules;
|
||
};
|
||
|
||
# A module to be imported in some other part of the configuration.
|
||
deferredModule = deferredModuleWith { };
|
||
|
||
# A module to be imported in some other part of the configuration.
|
||
# `staticModules`' options will be added to the documentation, unlike
|
||
# options declared via `config`.
|
||
deferredModuleWith = attrs@{ staticModules ? [] }: mkOptionType {
|
||
name = "deferredModule";
|
||
description = "module";
|
||
descriptionClass = "noun";
|
||
check = x: isAttrs x || isFunction x || path.check x;
|
||
merge = loc: defs: {
|
||
imports = staticModules ++ map (def: lib.setDefaultModuleLocation "${def.file}, via option ${showOption loc}" def.value) defs;
|
||
};
|
||
inherit (submoduleWith { modules = staticModules; })
|
||
getSubOptions
|
||
getSubModules;
|
||
substSubModules = m: deferredModuleWith (attrs // {
|
||
staticModules = m;
|
||
});
|
||
functor = defaultFunctor "deferredModuleWith" // {
|
||
type = types.deferredModuleWith;
|
||
payload = {
|
||
inherit staticModules;
|
||
};
|
||
binOp = lhs: rhs: {
|
||
staticModules = lhs.staticModules ++ rhs.staticModules;
|
||
};
|
||
};
|
||
};
|
||
|
||
# The type of a type!
|
||
optionType = mkOptionType {
|
||
name = "optionType";
|
||
description = "optionType";
|
||
descriptionClass = "noun";
|
||
check = value: value._type or null == "option-type";
|
||
merge = loc: defs:
|
||
if length defs == 1
|
||
then (head defs).value
|
||
else let
|
||
# Prepares the type definitions for mergeOptionDecls, which
|
||
# annotates submodules types with file locations
|
||
optionModules = map ({ value, file }:
|
||
{
|
||
_file = file;
|
||
# There's no way to merge types directly from the module system,
|
||
# but we can cheat a bit by just declaring an option with the type
|
||
options = lib.mkOption {
|
||
type = value;
|
||
};
|
||
}
|
||
) defs;
|
||
# Merges all the types into a single one, including submodule merging.
|
||
# This also propagates file information to all submodules
|
||
mergedOption = fixupOptionType loc (mergeOptionDecls loc optionModules);
|
||
in mergedOption.type;
|
||
};
|
||
|
||
submoduleWith =
|
||
{ modules
|
||
, specialArgs ? {}
|
||
, shorthandOnlyDefinesConfig ? false
|
||
, description ? null
|
||
, class ? null
|
||
}@attrs:
|
||
let
|
||
inherit (lib.modules) evalModules;
|
||
|
||
allModules = defs: map ({ value, file }:
|
||
if isAttrs value && shorthandOnlyDefinesConfig
|
||
then { _file = file; config = value; }
|
||
else { _file = file; imports = [ value ]; }
|
||
) defs;
|
||
|
||
base = evalModules {
|
||
inherit class specialArgs;
|
||
modules = [{
|
||
# This is a work-around for the fact that some sub-modules,
|
||
# such as the one included in an attribute set, expects an "args"
|
||
# attribute to be given to the sub-module. As the option
|
||
# evaluation does not have any specific attribute name yet, we
|
||
# provide a default for the documentation and the freeform type.
|
||
#
|
||
# This is necessary as some option declaration might use the
|
||
# "name" attribute given as argument of the submodule and use it
|
||
# as the default of option declarations.
|
||
#
|
||
# We use lookalike unicode single angle quotation marks because
|
||
# of the docbook transformation the options receive. In all uses
|
||
# > and < wouldn't be encoded correctly so the encoded values
|
||
# would be used, and use of `<` and `>` would break the XML document.
|
||
# It shouldn't cause an issue since this is cosmetic for the manual.
|
||
_module.args.name = lib.mkOptionDefault "‹name›";
|
||
}] ++ modules;
|
||
};
|
||
|
||
freeformType = base._module.freeformType;
|
||
|
||
name = "submodule";
|
||
|
||
in
|
||
mkOptionType {
|
||
inherit name;
|
||
description =
|
||
if description != null then description
|
||
else freeformType.description or name;
|
||
check = x: isAttrs x || isFunction x || path.check x;
|
||
merge = loc: defs:
|
||
(base.extendModules {
|
||
modules = [ { _module.args.name = last loc; } ] ++ allModules defs;
|
||
prefix = loc;
|
||
}).config;
|
||
emptyValue = { value = {}; };
|
||
getSubOptions = prefix: (base.extendModules
|
||
{ inherit prefix; }).options // optionalAttrs (freeformType != null) {
|
||
# Expose the sub options of the freeform type. Note that the option
|
||
# discovery doesn't care about the attribute name used here, so this
|
||
# is just to avoid conflicts with potential options from the submodule
|
||
_freeformOptions = freeformType.getSubOptions prefix;
|
||
};
|
||
getSubModules = modules;
|
||
substSubModules = m: submoduleWith (attrs // {
|
||
modules = m;
|
||
});
|
||
nestedTypes = lib.optionalAttrs (freeformType != null) {
|
||
freeformType = freeformType;
|
||
};
|
||
functor = defaultFunctor name // {
|
||
type = types.submoduleWith;
|
||
payload = {
|
||
inherit modules class specialArgs shorthandOnlyDefinesConfig description;
|
||
};
|
||
binOp = lhs: rhs: {
|
||
class =
|
||
# `or null` was added for backwards compatibility only. `class` is
|
||
# always set in the current version of the module system.
|
||
if lhs.class or null == null then rhs.class or null
|
||
else if rhs.class or null == null then lhs.class or null
|
||
else if lhs.class or null == rhs.class then lhs.class or null
|
||
else throw "A submoduleWith option is declared multiple times with conflicting class values \"${toString lhs.class}\" and \"${toString rhs.class}\".";
|
||
modules = lhs.modules ++ rhs.modules;
|
||
specialArgs =
|
||
let intersecting = builtins.intersectAttrs lhs.specialArgs rhs.specialArgs;
|
||
in if intersecting == {}
|
||
then lhs.specialArgs // rhs.specialArgs
|
||
else throw "A submoduleWith option is declared multiple times with the same specialArgs \"${toString (attrNames intersecting)}\"";
|
||
shorthandOnlyDefinesConfig =
|
||
if lhs.shorthandOnlyDefinesConfig == null
|
||
then rhs.shorthandOnlyDefinesConfig
|
||
else if rhs.shorthandOnlyDefinesConfig == null
|
||
then lhs.shorthandOnlyDefinesConfig
|
||
else if lhs.shorthandOnlyDefinesConfig == rhs.shorthandOnlyDefinesConfig
|
||
then lhs.shorthandOnlyDefinesConfig
|
||
else throw "A submoduleWith option is declared multiple times with conflicting shorthandOnlyDefinesConfig values";
|
||
description =
|
||
if lhs.description == null
|
||
then rhs.description
|
||
else if rhs.description == null
|
||
then lhs.description
|
||
else if lhs.description == rhs.description
|
||
then lhs.description
|
||
else throw "A submoduleWith option is declared multiple times with conflicting descriptions";
|
||
};
|
||
};
|
||
};
|
||
|
||
# A value from a set of allowed ones.
|
||
enum = values:
|
||
let
|
||
inherit (lib.lists) unique;
|
||
show = v:
|
||
if builtins.isString v then ''"${v}"''
|
||
else if builtins.isInt v then builtins.toString v
|
||
else if builtins.isBool v then boolToString v
|
||
else ''<${builtins.typeOf v}>'';
|
||
in
|
||
mkOptionType rec {
|
||
name = "enum";
|
||
description =
|
||
# Length 0 or 1 enums may occur in a design pattern with type merging
|
||
# where an "interface" module declares an empty enum and other modules
|
||
# provide implementations, each extending the enum with their own
|
||
# identifier.
|
||
if values == [] then
|
||
"impossible (empty enum)"
|
||
else if builtins.length values == 1 then
|
||
"value ${show (builtins.head values)} (singular enum)"
|
||
else
|
||
"one of ${concatMapStringsSep ", " show values}";
|
||
descriptionClass =
|
||
if builtins.length values < 2
|
||
then "noun"
|
||
else "conjunction";
|
||
check = flip elem values;
|
||
merge = mergeEqualOption;
|
||
functor = (defaultFunctor name) // { payload = values; binOp = a: b: unique (a ++ b); };
|
||
};
|
||
|
||
# Either value of type `t1` or `t2`.
|
||
either = t1: t2: mkOptionType rec {
|
||
name = "either";
|
||
description =
|
||
if t1.descriptionClass or null == "nonRestrictiveClause"
|
||
then
|
||
# Plain, but add comma
|
||
"${t1.description}, or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") t2}"
|
||
else
|
||
"${optionDescriptionPhrase (class: class == "noun" || class == "conjunction") t1} or ${optionDescriptionPhrase (class: class == "noun" || class == "conjunction" || class == "composite") t2}";
|
||
descriptionClass = "conjunction";
|
||
check = x: t1.check x || t2.check x;
|
||
merge = loc: defs:
|
||
let
|
||
defList = map (d: d.value) defs;
|
||
in
|
||
if all (x: t1.check x) defList
|
||
then t1.merge loc defs
|
||
else if all (x: t2.check x) defList
|
||
then t2.merge loc defs
|
||
else mergeOneOption loc defs;
|
||
typeMerge = f':
|
||
let mt1 = t1.typeMerge (elemAt f'.wrapped 0).functor;
|
||
mt2 = t2.typeMerge (elemAt f'.wrapped 1).functor;
|
||
in
|
||
if (name == f'.name) && (mt1 != null) && (mt2 != null)
|
||
then functor.type mt1 mt2
|
||
else null;
|
||
functor = (defaultFunctor name) // { wrapped = [ t1 t2 ]; };
|
||
nestedTypes.left = t1;
|
||
nestedTypes.right = t2;
|
||
};
|
||
|
||
# Any of the types in the given list
|
||
oneOf = ts:
|
||
let
|
||
head' = if ts == [] then throw "types.oneOf needs to get at least one type in its argument" else head ts;
|
||
tail' = tail ts;
|
||
in foldl' either head' tail';
|
||
|
||
# Either value of type `coercedType` or `finalType`, the former is
|
||
# converted to `finalType` using `coerceFunc`.
|
||
coercedTo = coercedType: coerceFunc: finalType:
|
||
assert lib.assertMsg (coercedType.getSubModules == null)
|
||
"coercedTo: coercedType must not have submodules (it’s a ${
|
||
coercedType.description})";
|
||
mkOptionType rec {
|
||
name = "coercedTo";
|
||
description = "${optionDescriptionPhrase (class: class == "noun") finalType} or ${optionDescriptionPhrase (class: class == "noun") coercedType} convertible to it";
|
||
check = x: (coercedType.check x && finalType.check (coerceFunc x)) || finalType.check x;
|
||
merge = loc: defs:
|
||
let
|
||
coerceVal = val:
|
||
if coercedType.check val then coerceFunc val
|
||
else val;
|
||
in finalType.merge loc (map (def: def // { value = coerceVal def.value; }) defs);
|
||
emptyValue = finalType.emptyValue;
|
||
getSubOptions = finalType.getSubOptions;
|
||
getSubModules = finalType.getSubModules;
|
||
substSubModules = m: coercedTo coercedType coerceFunc (finalType.substSubModules m);
|
||
typeMerge = t1: t2: null;
|
||
functor = (defaultFunctor name) // { wrapped = finalType; };
|
||
nestedTypes.coercedType = coercedType;
|
||
nestedTypes.finalType = finalType;
|
||
};
|
||
|
||
# Augment the given type with an additional type check function.
|
||
addCheck = elemType: check: elemType // { check = x: elemType.check x && check x; };
|
||
|
||
};
|
||
};
|
||
|
||
in outer_types // outer_types.types
|