681 lines
24 KiB
Nix
681 lines
24 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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functionArgs
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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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setFunctionArgs
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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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unique
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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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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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isCoercibleToString
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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) mergeDefinitions;
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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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, # Function applied to each definition that should return true if
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# its type-correct, false otherwise.
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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 list 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 name check merge emptyValue getSubOptions getSubModules substSubModules typeMerge functor deprecationMessage nestedTypes;
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description = if description == null then name else description;
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};
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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.xml!
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types = rec {
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anything = mkOptionType {
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name = "anything";
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description = "anything";
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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 && isCoercibleToString 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 ${showFiles (getFiles defs)}"
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) (getType (head defs).value) defs;
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mergeFunction = {
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# Recursively merge attribute sets
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set = (attrsOf anything).merge;
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# Safe and deterministic behavior for lists is to only accept one definition
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# listOf only used to apply mkIf and co.
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list =
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if length defs > 1
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then throw "The option `${showOption loc}' has conflicting definitions, in ${showFiles (getFiles defs)}."
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else (listOf anything).merge;
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# This is the type of packages, only accept a single definition
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stringCoercibleSet = mergeOneOption;
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# Otherwise fall back to only allowing all equal definitions
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}.${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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};
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bool = mkOptionType {
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name = "bool";
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description = "boolean";
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check = isBool;
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merge = mergeEqualOption;
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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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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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/* An int with a fixed range.
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*
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* Example:
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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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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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};
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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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};
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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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s8 = sign 8 256;
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s16 = sign 16 65536;
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s32 = sign 32 4294967296;
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};
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# Alias of u16 for a port number
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port = ints.u16;
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float = mkOptionType {
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name = "float";
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description = "floating point number";
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check = isFloat;
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merge = mergeEqualOption;
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};
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str = mkOptionType {
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name = "str";
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description = "string";
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check = isString;
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merge = mergeEqualOption;
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};
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nonEmptyStr = mkOptionType {
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name = "nonEmptyStr";
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description = "non-empty string";
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check = x: str.check x && builtins.match "[ \t\n]*" x == null;
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inherit (str) merge;
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};
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strMatching = pattern: mkOptionType {
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name = "strMatching ${escapeNixString pattern}";
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description = "string matching the pattern ${pattern}";
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check = x: str.check x && builtins.match pattern x != null;
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inherit (str) merge;
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};
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# Merge multiple definitions by concatenating them (with the given
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# separator between the values).
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separatedString = sep: mkOptionType rec {
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name = "separatedString";
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description = if sep == ""
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then "Concatenated string" # for types.string.
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else "strings concatenated with ${builtins.toJSON sep}"
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;
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check = isString;
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merge = loc: defs: concatStringsSep sep (getValues defs);
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functor = (defaultFunctor name) // {
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payload = sep;
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binOp = sepLhs: sepRhs:
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if sepLhs == sepRhs then sepLhs
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else null;
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};
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};
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lines = separatedString "\n";
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commas = separatedString ",";
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envVar = separatedString ":";
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# Deprecated; should not be used because it quietly concatenates
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# strings, which is usually not what you want.
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string = separatedString "" // {
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name = "string";
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deprecationMessage = "See https://github.com/NixOS/nixpkgs/pull/66346 for better alternative types.";
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};
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attrs = mkOptionType {
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name = "attrs";
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description = "attribute set";
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check = isAttrs;
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merge = loc: foldl' (res: def: res // def.value) {};
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emptyValue = { value = {}; };
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};
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# derivation is a reserved keyword.
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package = mkOptionType {
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name = "package";
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check = x: isDerivation x || isStorePath x;
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merge = loc: defs:
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let res = mergeOneOption loc defs;
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in if isDerivation res then res else toDerivation res;
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};
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shellPackage = package // {
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check = x: isDerivation x && hasAttr "shellPath" x;
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};
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path = mkOptionType {
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name = "path";
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check = x: isCoercibleToString x && builtins.substring 0 1 (toString x) == "/";
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merge = mergeEqualOption;
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};
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listOf = elemType: mkOptionType rec {
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name = "listOf";
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description = "list of ${elemType.description}s";
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check = isList;
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merge = loc: defs:
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map (x: x.value) (filter (x: x ? value) (concatLists (imap1 (n: def:
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imap1 (m: def':
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(mergeDefinitions
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(loc ++ ["[definition ${toString n}-entry ${toString m}]"])
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elemType
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[{ inherit (def) file; value = def'; }]
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).optionalValue
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) def.value
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) defs)));
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emptyValue = { value = {}; };
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["*"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: listOf (elemType.substSubModules m);
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functor = (defaultFunctor name) // { wrapped = elemType; };
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nestedTypes.elemType = elemType;
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};
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nonEmptyListOf = elemType:
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let list = addCheck (types.listOf elemType) (l: l != []);
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in list // {
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description = "non-empty " + list.description;
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# Note: emptyValue is left as is, because another module may define an element.
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};
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attrsOf = elemType: mkOptionType rec {
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name = "attrsOf";
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description = "attribute set of ${elemType.description}s";
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check = isAttrs;
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merge = loc: defs:
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mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
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(mergeDefinitions (loc ++ [name]) elemType defs).optionalValue
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)
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# Push down position info.
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(map (def: mapAttrs (n: v: { inherit (def) file; value = v; }) def.value) defs)));
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emptyValue = { value = {}; };
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: attrsOf (elemType.substSubModules m);
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functor = (defaultFunctor name) // { wrapped = elemType; };
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nestedTypes.elemType = elemType;
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};
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# A version of attrsOf that's lazy in its values at the expense of
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# conditional definitions not working properly. E.g. defining a value with
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# `foo.attr = mkIf false 10`, then `foo ? attr == true`, whereas with
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# attrsOf it would correctly be `false`. Accessing `foo.attr` would throw an
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# error that it's not defined. Use only if conditional definitions don't make sense.
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lazyAttrsOf = elemType: mkOptionType rec {
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name = "lazyAttrsOf";
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description = "lazy attribute set of ${elemType.description}s";
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check = isAttrs;
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merge = loc: defs:
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zipAttrsWith (name: defs:
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let merged = mergeDefinitions (loc ++ [name]) elemType defs;
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# mergedValue will trigger an appropriate error when accessed
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in merged.optionalValue.value or elemType.emptyValue.value or merged.mergedValue
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)
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# Push down position info.
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(map (def: mapAttrs (n: v: { inherit (def) file; value = v; }) def.value) defs);
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emptyValue = { value = {}; };
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: lazyAttrsOf (elemType.substSubModules m);
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functor = (defaultFunctor name) // { wrapped = elemType; };
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nestedTypes.elemType = elemType;
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};
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# TODO: drop this in the future:
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loaOf = elemType: types.attrsOf elemType // {
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name = "loaOf";
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deprecationMessage = "Mixing lists with attribute values is no longer"
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+ " possible; please use `types.attrsOf` instead. See"
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+ " https://github.com/NixOS/nixpkgs/issues/1800 for the motivation.";
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nestedTypes.elemType = elemType;
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};
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# Value of given type but with no merging (i.e. `uniq list`s are not concatenated).
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uniq = elemType: mkOptionType rec {
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name = "uniq";
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inherit (elemType) description check;
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merge = mergeOneOption;
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emptyValue = elemType.emptyValue;
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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: uniq (elemType.substSubModules m);
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functor = (defaultFunctor name) // { wrapped = elemType; };
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nestedTypes.elemType = elemType;
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};
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# Null or value of ...
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nullOr = elemType: mkOptionType rec {
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name = "nullOr";
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description = "null or ${elemType.description}";
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check = x: x == null || elemType.check x;
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merge = loc: defs:
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let nrNulls = count (def: def.value == null) defs; in
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if nrNulls == length defs then null
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else if nrNulls != 0 then
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throw "The option `${showOption loc}` is defined both null and not null, in ${showFiles (getFiles defs)}."
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else elemType.merge loc defs;
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emptyValue = { value = null; };
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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: nullOr (elemType.substSubModules m);
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functor = (defaultFunctor name) // { wrapped = elemType; };
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nestedTypes.elemType = elemType;
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};
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functionTo = elemType: mkOptionType {
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name = "functionTo";
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description = "function that evaluates to a(n) ${elemType.name}";
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check = isFunction;
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merge = loc: defs:
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fnArgs: (mergeDefinitions (loc ++ [ "[function body]" ]) elemType (map (fn: { inherit (fn) file; value = fn.value fnArgs; }) defs)).mergedValue;
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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: functionTo (elemType.substSubModules m);
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};
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# A submodule (like typed attribute set). See NixOS manual.
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submodule = modules: submoduleWith {
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shorthandOnlyDefinesConfig = true;
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modules = toList modules;
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};
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submoduleWith =
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{ modules
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, specialArgs ? {}
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, shorthandOnlyDefinesConfig ? false
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}@attrs:
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let
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inherit (lib.modules) evalModules;
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coerce = unify: value: if isFunction value
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then setFunctionArgs (args: unify (value args)) (functionArgs value)
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else unify (if shorthandOnlyDefinesConfig then { config = value; } else value);
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allModules = defs: modules ++ imap1 (n: { value, file }:
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if isAttrs value || isFunction value then
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# Annotate the value with the location of its definition for better error messages
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coerce (lib.modules.unifyModuleSyntax file "${toString file}-${toString n}") value
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else value
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) defs;
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freeformType = (evalModules {
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inherit modules specialArgs;
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args.name = "‹name›";
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})._module.freeformType;
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in
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mkOptionType rec {
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name = "submodule";
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||
description = freeformType.description or name;
|
||
check = x: isAttrs x || isFunction x || path.check x;
|
||
merge = loc: defs:
|
||
(evalModules {
|
||
modules = allModules defs;
|
||
inherit specialArgs;
|
||
args.name = last loc;
|
||
prefix = loc;
|
||
}).config;
|
||
emptyValue = { value = {}; };
|
||
getSubOptions = prefix: (evalModules
|
||
{ inherit modules prefix specialArgs;
|
||
# This is a work-around due to the fact that some sub-modules,
|
||
# such as the one included in an attribute set, expects a "args"
|
||
# attribute to be given to the sub-module. As the option
|
||
# evaluation does not have any specific attribute name, we
|
||
# provide a default one for the documentation.
|
||
#
|
||
# This is mandatory as some option declaration might use the
|
||
# "name" attribute given as argument of the submodule and use it
|
||
# as the default of option declarations.
|
||
#
|
||
# Using 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.
|
||
args.name = "‹name›";
|
||
}).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 = {
|
||
modules = modules;
|
||
specialArgs = specialArgs;
|
||
shorthandOnlyDefinesConfig = shorthandOnlyDefinesConfig;
|
||
};
|
||
binOp = lhs: rhs: {
|
||
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 == rhs.shorthandOnlyDefinesConfig
|
||
then lhs.shorthandOnlyDefinesConfig
|
||
else throw "A submoduleWith option is declared multiple times with conflicting shorthandOnlyDefinesConfig values";
|
||
};
|
||
};
|
||
};
|
||
|
||
# A value from a set of allowed ones.
|
||
enum = values:
|
||
let
|
||
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 ${concatMapStringsSep ", " show values}";
|
||
check = flip elem values;
|
||
merge = mergeEqualOption;
|
||
functor = (defaultFunctor name) // { payload = values; binOp = a: b: unique (a ++ b); };
|
||
};
|
||
|
||
# Either value of type `t1` or `t2`.
|
||
either = t1: t2: mkOptionType rec {
|
||
name = "either";
|
||
description = "${t1.description} or ${t2.description}";
|
||
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 ${
|
||
coercedType.description})";
|
||
mkOptionType rec {
|
||
name = "coercedTo";
|
||
description = "${finalType.description} or ${coercedType.description} 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;
|
||
};
|
||
|
||
# Obsolete alternative to configOf. It takes its option
|
||
# declarations from the ‘options’ attribute of containing option
|
||
# declaration.
|
||
optionSet = mkOptionType {
|
||
name = "optionSet";
|
||
description = "option set";
|
||
deprecationMessage = "Use `types.submodule' instead";
|
||
};
|
||
# 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
|