- Enforce that an option declaration has a "defaultText" if and only if the type of the option derives from "package", "packageSet" or "nixpkgsConfig" and if a "default" attribute is defined. - Enforce that the value of the "example" attribute is wrapped with "literalExample" if the type of the option derives from "package", "packageSet" or "nixpkgsConfig". - Warn if a "defaultText" is defined in an option declaration if the type of the option does not derive from "package", "packageSet" or "nixpkgsConfig". - Warn if no "type" is defined in an option declaration.
386 lines
14 KiB
Nix
386 lines
14 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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let lib = import ./default.nix; in
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with import ./lists.nix;
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with import ./attrsets.nix;
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with import ./options.nix;
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with import ./trivial.nix;
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with import ./strings.nix;
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with {inherit (import ./modules.nix) mergeDefinitions filterOverrides; };
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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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isOptionType = isType "option-type";
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mkOptionType =
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{ # Human-readable representation of the type.
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name
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, # Parseable representation of the type.
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typerep
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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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, # Return list of sub-options.
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getSubOptions ? {}
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, # Same as 'getSubOptions', but with extra information about the
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# location of the option which is used to generate documentation.
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getSubOptionsPrefixed ? null
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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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, # List of type representations (typerep) of all the elementary types
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# that are nested within the type. For an elementary type the list is
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# a singleton of the typerep of itself.
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# NOTE: Must be specified for every container type!
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nestedTypes ? null
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, # List of all default values, and an empty list if no default value exists.
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defaultValues ? []
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}:
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{ _type = "option-type";
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inherit name typerep check merge getSubOptions getSubModules substSubModules defaultValues;
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nestedTypes = if (isNull nestedTypes) then (singleton typerep) else nestedTypes;
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getSubOptionsPrefixed = if (isNull getSubOptionsPrefixed) then (prefix: getSubOptions) else getSubOptionsPrefixed;
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};
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types = rec {
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#
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# Elementary types
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#
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unspecified = mkOptionType {
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name = "unspecified";
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typerep = "(unspecified)";
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};
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bool = mkOptionType {
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name = "boolean";
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typerep = "(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 = "integer";
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typerep = "(integer)";
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check = isInt;
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merge = mergeOneOption;
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};
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str = mkOptionType {
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name = "string";
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typerep = "(string)";
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check = isString;
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merge = mergeOneOption;
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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 {
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name = "string" + (optionalString (sep != "") " separated by ${sep}");
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typerep = "(separatedString(${escape ["(" ")"] sep}))";
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check = isString;
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merge = _module: loc: defs: concatStringsSep sep (getValues defs);
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};
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lines = separatedString "\n" // { typerep = "(lines)"; };
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commas = separatedString "," // { typerep = "(commas)"; };
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envVar = separatedString ":" // { typerep = "(envVar)"; };
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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 "" // { typerep = "(string)"; };
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attrs = mkOptionType {
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name = "attribute set";
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typerep = "(attrs)";
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check = isAttrs;
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merge = _module: loc: foldl' (res: def: mergeAttrs res def.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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typerep = "(package)";
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check = x: isDerivation x || isStorePath x;
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merge = _module: loc: defs:
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let res = mergeOneOption _module loc defs;
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in if isDerivation res then res else toDerivation res;
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};
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# The correct type of packageSet would be:
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# packageSet = attrsOf (either package packageSet)
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# (Not sure if nix would allow to define a recursive type.)
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# However, currently it is not possible to check that a packageSet actually
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# contains packages (that is derivations). The check 'isDerivation' is too
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# eager for the current implementation of the assertion mechanism and of the
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# licenses control mechanism. That means it is not generally possible to go
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# into the attribute set of packages to check that every attribute would
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# evaluate to a derivation if the package would actually be evaluated. Maybe
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# that restriction can be lifted in the future, but for now the content of
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# the packageSet is not checked.
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# TODO: The 'merge' function is copied from 'mergeDefaultOption' to keep
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# backwards compatibility with the 'unspecified' type that was used for
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# package sets previously. Maybe review if the merge function has to change.
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packageSet = mkOptionType {
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name = "derivation set";
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typerep = "(packageSet)";
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check = isAttrs;
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merge = _module: loc: defs: foldl' mergeAttrs {} (map (x: x.value) defs);
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};
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path = mkOptionType {
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name = "path";
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typerep = "(path)";
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# Hacky: there is no ‘isPath’ primop.
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check = x: builtins.substring 0 1 (toString x) == "/";
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merge = mergeOneOption;
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};
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#
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# Container types
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#
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# drop this in the future:
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list = builtins.trace "`types.list' is deprecated; use `types.listOf' instead" types.listOf;
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listOf = elemType: mkOptionType {
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name = "list of ${elemType.name}s";
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typerep = "(listOf${elemType.typerep})";
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check = isList;
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merge = _module: loc: defs:
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map (x: x.value) (filter (x: x ? value) (concatLists (imap (n: def: imap (m: def':
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(mergeDefinitions _module
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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) defs)));
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getSubOptions = elemType.getSubOptions;
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getSubOptionsPrefixed = prefix: elemType.getSubOptionsPrefixed (prefix ++ ["*"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: listOf (elemType.substSubModules m);
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nestedTypes = elemType.nestedTypes;
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defaultValues = [[]];
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};
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attrsOf = elemType: mkOptionType {
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name = "attribute set of ${elemType.name}s";
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typerep = "(attrsOf${elemType.typerep})";
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check = isAttrs;
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merge = _module: loc: defs:
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mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
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(mergeDefinitions _module (loc ++ [name]) elemType defs).optionalValue
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)
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# Push down position info.
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(map (def: listToAttrs (mapAttrsToList (n: def':
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{ name = n; value = { inherit (def) file; value = def'; }; }) def.value)) defs)));
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getSubOptions = elemType.getSubOptions;
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getSubOptionsPrefixed = prefix: elemType.getSubOptionsPrefixed (prefix ++ ["<name>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: attrsOf (elemType.substSubModules m);
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nestedTypes = elemType.nestedTypes;
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defaultValues = [{}];
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};
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# List or attribute set of ...
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loaOf = elemType:
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let
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convertIfList = defIdx: def:
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if isList def.value then
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{ inherit (def) file;
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value = listToAttrs (
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imap (elemIdx: elem:
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{ name = elem.name or "unnamed-${toString defIdx}.${toString elemIdx}";
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value = elem;
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}) def.value);
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}
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else
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def;
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listOnly = listOf elemType;
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attrOnly = attrsOf elemType;
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in mkOptionType {
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name = "list or attribute set of ${elemType.name}s";
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typerep = "(loaOf${elemType.typerep})";
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check = x: isList x || isAttrs x;
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merge = _module: loc: defs: attrOnly.merge _module loc (imap convertIfList defs);
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getSubOptions = elemType.getSubOptions;
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getSubOptionsPrefixed = prefix: elemType.getSubOptionsPrefixed (prefix ++ ["<name?>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: loaOf (elemType.substSubModules m);
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nestedTypes = elemType.nestedTypes;
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defaultValues = [{} []];
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};
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# List or element of ...
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loeOf = elemType: mkOptionType {
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name = "element or list of ${elemType.name}s";
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typerep = "(loeOf${elemType.typerep})";
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check = x: isList x || elemType.check x;
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merge = _module: loc: defs:
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let
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defs' = filterOverrides defs;
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res = (head defs').value;
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in
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if isList res then concatLists (getValues defs')
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else if lessThan 1 (length defs') then
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throw "The option `${showOption loc}' is defined multiple times, in ${showFiles (getFiles defs)}."
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else if !isString res then
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throw "The option `${showOption loc}' does not have a string value, in ${showFiles (getFiles defs)}."
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else res;
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nestedTypes = elemType.nestedTypes;
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defaultValues = [[]] ++ elemType.defaultValues;
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};
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uniq = elemType: mkOptionType {
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inherit (elemType) check;
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name = "unique ${elemType.name}";
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typerep = "(uniq${elemType.typerep})";
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merge = mergeOneOption;
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getSubOptions = elemType.getSubOptions;
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getSubOptionsPrefixed = prefix: elemType.getSubOptionsPrefixed prefix;
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getSubModules = elemType.getSubModules;
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substSubModules = m: uniq (elemType.substSubModules m);
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nestedTypes = elemType.nestedTypes;
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defaultValues = elemType.defaultValues;
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};
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nullOr = elemType: mkOptionType {
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name = "null or ${elemType.name}";
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typerep = "(nullOr${elemType.typerep})";
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check = x: x == null || elemType.check x;
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merge = _module: 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 ${showFiles (getFiles defs)}."
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else elemType.merge _module loc defs;
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getSubOptions = elemType.getSubOptions;
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getSubOptionsPrefixed = prefix: elemType.getSubOptionsPrefixed prefix;
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getSubModules = elemType.getSubModules;
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substSubModules = m: nullOr (elemType.substSubModules m);
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nestedTypes = elemType.nestedTypes;
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defaultValues = [null] ++ elemType.defaultValues;
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};
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enum = values:
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let
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show = v:
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if builtins.isString v then ''"${v}"''
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else if builtins.isInt v then builtins.toString v
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else ''<${builtins.typeOf v}>'';
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in
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mkOptionType {
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name = "one of ${concatMapStringsSep ", " show values}";
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typerep = "(enum${concatMapStrings (x: "(${escape ["(" ")"] (builtins.toString x)})") values})";
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check = flip elem values;
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merge = mergeOneOption;
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nestedTypes = [];
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};
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either = t1: t2: mkOptionType {
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name = "${t1.name} or ${t2.name}";
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typerep = "(either${t1.typerep}${t2.typerep})";
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check = x: t1.check x || t2.check x;
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merge = mergeOneOption;
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nestedTypes = t1.nestedTypes ++ t2.nestedTypes;
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defaultValues = t1.defaultValues ++ t2.defaultValues;
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};
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#
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# Complex types
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#
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submodule = opts:
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let
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opts' = toList opts;
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inherit (import ./modules.nix) evalModules;
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filterVisible = filter (opt: (if opt ? visible then opt.visible else true) && (if opt ? internal then !opt.internal else true));
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in
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mkOptionType rec {
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name = "submodule";
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typerep = "(submodule)";
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check = x: isAttrs x || isFunction x;
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merge = _module: loc: defs:
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let
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internalModule = [ { inherit _module; } { _module.args.name = lib.mkForce (last loc); } ];
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coerce = def: if isFunction def then def else { config = def; };
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modules = opts' ++ internalModule ++ map (def: { _file = def.file; imports = [(coerce def.value)]; }) defs;
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in (evalModules {
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inherit modules;
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prefix = loc;
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}).config;
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getSubOptions = getSubOptionsPrefixed [];
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getSubOptionsPrefixed = prefix: _module:
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let
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# FIXME: hack to get shit to evaluate.
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internalModule = [ { inherit _module; } { _module.args.name = lib.mkForce ""; } ];
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in (evalModules {
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modules = opts' ++ internalModule;
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inherit prefix;
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}).options;
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getSubModules = opts';
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substSubModules = m: submodule m;
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nestedTypes = concatMap (opt: opt.type.nestedTypes) (collect (lib.isType "option") (getSubOptions {}));
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defaultValues = [{}];
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};
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#
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# Legacy types
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#
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# Obsolete alternative to configOf. It takes its option
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# declarations from the ‘options’ attribute of containing option
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# declaration.
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optionSet = mkOptionType {
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name = /* builtins.trace "types.optionSet is deprecated; use types.submodule instead" */ "option set";
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typerep = "(optionSet)";
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};
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# Try to remove module options of that type wherever possible.
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# A module option taking a function can not be introspected and documented properly.
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functionTo = resultType:
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mkOptionType {
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name = "function to ${resultType.name}";
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typerep = "(function${resultType.typerep})";
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check = builtins.isFunction;
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merge = mergeOneOption;
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nestedTypes = resultType.nestedTypes;
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defaultValues = map (x: {...}:x) resultType.nestedTypes; # INFO: It seems as nix can't compare functions, yet.
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};
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#
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# misc
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#
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# Augment the given type with an additional type check function.
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addCheck = elemType: check: elemType // { check = x: elemType.check x && check x; };
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};
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}
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