0a0a29fd0b
Ideally the module system could be configured pretty much completely by the contents of the modules themselves, so add comments about avoiding complicating it further and possibly removing now-redundant configurability from the existing interface.
242 lines
8 KiB
Nix
242 lines
8 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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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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let
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inherit (import ./modules.nix) mergeDefinitions;
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in 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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, # 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 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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}:
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{ _type = "option-type";
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inherit name check merge getSubOptions getSubModules substSubModules;
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};
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types = rec {
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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 = "boolean";
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check = isBool;
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merge = loc: fold (x: y: x.value || y) false;
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};
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int = mkOptionType {
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name = "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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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";
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check = isString;
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merge = loc: defs: concatStringsSep sep (getValues defs);
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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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attrs = mkOptionType {
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name = "attribute set";
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check = isAttrs;
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merge = loc: fold (def: mergeAttrs 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 = "derivation";
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check = isDerivation;
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merge = mergeOneOption;
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};
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path = mkOptionType {
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name = "path";
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# Hacky: there is no ‘isPath’ primop.
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check = x: builtins.unsafeDiscardStringContext (builtins.substring 0 1 (toString x)) == "/";
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merge = mergeOneOption;
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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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check = isList;
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merge = 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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let
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inherit (mergeDefinitions (loc ++ ["[definition ${toString n}-entry ${toString m}]"])
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elemType [{ inherit (def) file; value = def'; }]
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) defsFinal mergedValue;
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in if defsFinal == [] then {} else { value = mergedValue; }) def.value) defs)));
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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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};
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attrsOf = elemType: mkOptionType {
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name = "attribute set of ${elemType.name}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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let
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inherit (mergeDefinitions (loc ++ [name]) elemType defs)
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defsFinal mergedValue;
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in if defsFinal == [] then {} else { value = mergedValue; })
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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 = 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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};
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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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check = x: isList x || isAttrs x;
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merge = loc: defs: attrOnly.merge loc (imap convertIfList defs);
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name?>"]);
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getSubModules = elemType.getSubModules;
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substSubModules = m: loaOf (elemType.substSubModules m);
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};
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uniq = elemType: mkOptionType {
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inherit (elemType) name check;
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merge = mergeOneOption;
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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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};
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nullOr = elemType: mkOptionType {
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name = "null or ${elemType.name}";
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check = x: builtins.isNull x || elemType.check x;
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merge = loc: defs:
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let nrNulls = count (def: isNull def.value) defs; in
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if nrNulls == length defs then null
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else if nrNulls != 0 then
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throw "The option `${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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getSubOptions = elemType.getSubOptions;
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getSubModules = elemType.getSubModules;
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substSubModules = m: nullOr (elemType.substSubModules m);
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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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in
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mkOptionType rec {
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name = "submodule";
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check = x: isAttrs x || isFunction x;
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merge = loc: defs:
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let
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coerce = def: if isFunction def then def else { config = def; };
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modules = opts' ++ 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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# !!! See comment about args in lib/modules.nix
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args.name = last loc;
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prefix = loc;
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}).config;
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getSubOptions = prefix: (evalModules
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{ modules = opts'; inherit prefix;
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# FIXME: hack to get shit to evaluate.
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args = { name = ""; }; }).options;
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getSubModules = opts';
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substSubModules = m: submodule m;
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};
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enum = values: mkOptionType {
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name = "one of ${concatStringsSep ", " values}";
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check = flip elem values;
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merge = mergeOneOption;
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};
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either = t1: t2: mkOptionType {
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name = "${t1.name} or ${t2.name}";
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check = x: t1.check x || t2.check x;
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merge = mergeOneOption;
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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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};
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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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