2009-06-26 07:53:31 -06:00
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# Definitions related to run-time type checking. Used in particular
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# to type-check NixOS configurations.
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2013-10-30 12:12:25 -06:00
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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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2017-02-08 18:52:13 -07:00
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let inherit (import ./modules.nix) mergeDefinitions filterOverrides; in
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2009-06-26 07:53:31 -06:00
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2015-03-12 16:01:47 -06:00
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rec {
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2009-06-26 07:53:31 -06:00
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2013-03-13 08:05:30 -06:00
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isType = type: x: (x._type or "") == type;
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2009-06-26 07:53:31 -06:00
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2009-11-19 10:19:39 -07:00
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setType = typeName: value: value // {
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_type = typeName;
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};
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2011-06-13 20:41:13 -06:00
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2016-09-06 19:03:32 -06:00
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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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2013-03-13 08:05:30 -06:00
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isOptionType = isType "option-type";
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2009-06-26 07:53:31 -06:00
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mkOptionType =
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2016-09-06 19:03:32 -06:00
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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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2013-10-28 12:48:30 -06:00
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name
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2017-04-19 13:41:28 -06:00
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, # Description of the type, defined recursively by embedding the wrapped type if any.
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2016-09-06 19:03:32 -06:00
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description ? null
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2013-10-28 12:48:30 -06:00
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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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2013-10-30 07:21:41 -06:00
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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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2013-10-28 12:48:30 -06:00
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merge ? mergeDefaultOption
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2016-03-01 12:47:08 -07:00
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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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2014-08-29 08:42:44 -06:00
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, # List of modules if any, or null if none.
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getSubModules ? null
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2016-09-06 19:03:32 -06:00
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, # Function for building the same option type with a different list of
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2014-08-29 08:42:44 -06:00
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# modules.
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substSubModules ? m: null
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2016-09-06 19:03:32 -06:00
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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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2017-03-11 15:39:40 -07:00
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# payload: values of the type, two payloads of the same type must be
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2016-09-06 19:03:32 -06:00
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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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2009-06-26 07:53:31 -06:00
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}:
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{ _type = "option-type";
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2016-09-06 19:03:32 -06:00
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inherit name check merge getSubOptions getSubModules substSubModules typeMerge functor;
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description = if description == null then name else description;
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2009-06-26 07:53:31 -06:00
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};
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2011-06-13 20:41:13 -06:00
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2009-11-06 18:58:56 -07:00
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types = rec {
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2009-06-26 07:53:31 -06:00
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2013-10-27 17:56:22 -06:00
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unspecified = mkOptionType {
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name = "unspecified";
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};
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2009-06-26 07:53:31 -06:00
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bool = mkOptionType {
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2016-09-06 19:03:32 -06:00
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name = "bool";
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description = "boolean";
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2013-11-12 05:48:19 -07:00
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check = isBool;
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2015-06-15 10:04:27 -06:00
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merge = mergeEqualOption;
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2009-06-26 07:53:31 -06:00
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};
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2016-09-06 19:03:32 -06:00
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int = mkOptionType rec {
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name = "int";
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description = "integer";
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2013-11-12 05:48:19 -07:00
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check = isInt;
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2013-10-30 07:21:41 -06:00
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merge = mergeOneOption;
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2009-06-26 07:53:31 -06:00
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};
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2013-10-29 06:45:30 -06:00
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str = mkOptionType {
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2016-09-06 19:03:32 -06:00
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name = "str";
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description = "string";
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2013-11-12 05:48:19 -07:00
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check = isString;
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2013-10-29 06:45:30 -06:00
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merge = mergeOneOption;
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};
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2013-10-30 07:21:41 -06:00
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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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2016-09-06 19:03:32 -06:00
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separatedString = sep: mkOptionType rec {
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name = "separatedString";
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description = "string";
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2013-11-12 05:48:19 -07:00
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check = isString;
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2016-03-01 12:47:08 -07:00
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merge = loc: defs: concatStringsSep sep (getValues defs);
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2016-09-06 19:03:32 -06:00
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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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2013-02-11 07:28:41 -07:00
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};
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2016-03-01 12:47:08 -07:00
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lines = separatedString "\n";
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commas = separatedString ",";
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envVar = separatedString ":";
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2013-10-28 09:14:15 -06:00
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2013-10-30 07:21:41 -06:00
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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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2016-03-01 12:47:08 -07:00
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string = separatedString "";
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2009-11-06 18:58:56 -07:00
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2009-06-26 07:53:31 -06:00
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attrs = mkOptionType {
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2016-09-06 19:03:32 -06:00
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name = "attrs";
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description = "attribute set";
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2013-10-27 17:56:22 -06:00
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check = isAttrs;
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2016-03-01 12:47:08 -07:00
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merge = loc: foldl' (res: def: mergeAttrs res def.value) {};
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2009-06-26 07:53:31 -06:00
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};
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# derivation is a reserved keyword.
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package = mkOptionType {
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2016-02-17 12:24:22 -07:00
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name = "package";
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2015-08-06 11:55:42 -06:00
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check = x: isDerivation x || isStorePath x;
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2016-03-01 12:47:08 -07:00
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merge = loc: defs:
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let res = mergeOneOption loc defs;
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2015-08-06 11:55:42 -06:00
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in if isDerivation res then res else toDerivation res;
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2009-06-26 07:53:31 -06:00
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};
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2016-06-12 13:03:14 -06:00
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shellPackage = package // {
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check = x: (package.check x) && (hasAttr "shellPath" x);
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};
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2012-05-25 11:19:07 -06:00
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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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2015-08-15 07:38:12 -06:00
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check = x: builtins.substring 0 1 (toString x) == "/";
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2013-10-28 12:48:30 -06:00
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merge = mergeOneOption;
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2012-05-25 11:19:07 -06:00
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};
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2013-08-22 00:45:22 -06:00
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# drop this in the future:
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2013-10-28 12:48:30 -06:00
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list = builtins.trace "`types.list' is deprecated; use `types.listOf' instead" types.listOf;
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2013-08-22 00:45:22 -06:00
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2016-09-06 19:03:32 -06:00
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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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2014-05-01 15:58:16 -06:00
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check = isList;
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2016-03-01 12:47:08 -07:00
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merge = loc: defs:
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2016-05-25 03:02:38 -06:00
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map (x: x.value) (filter (x: x ? value) (concatLists (imap (n: def:
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if isList def.value then
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imap (m: def':
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(mergeDefinitions
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(loc ++ ["[definition ${toString n}-entry ${toString m}]"])
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elemType
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[{ inherit (def) file; value = def'; }]
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).optionalValue
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) def.value
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else
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throw "The option value `${showOption loc}' in `${def.file}' is not a list.") defs)));
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2016-03-01 12:47:08 -07:00
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["*"]);
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2014-08-29 08:42:44 -06:00
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getSubModules = elemType.getSubModules;
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substSubModules = m: listOf (elemType.substSubModules m);
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2016-09-06 19:03:32 -06:00
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functor = (defaultFunctor name) // { wrapped = elemType; };
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2009-06-26 07:53:31 -06:00
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};
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2016-09-06 19:03:32 -06:00
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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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2014-05-01 16:13:06 -06:00
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check = isAttrs;
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2016-03-01 12:47:08 -07:00
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merge = loc: defs:
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2014-05-01 16:13:06 -06:00
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mapAttrs (n: v: v.value) (filterAttrs (n: v: v ? value) (zipAttrsWith (name: defs:
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2016-03-01 12:47:08 -07:00
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(mergeDefinitions (loc ++ [name]) elemType defs).optionalValue
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2015-03-12 16:01:47 -06:00
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)
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2013-10-30 07:21:41 -06:00
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# Push down position info.
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(map (def: listToAttrs (mapAttrsToList (n: def':
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2014-05-01 16:13:06 -06:00
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{ name = n; value = { inherit (def) file; value = def'; }; }) def.value)) defs)));
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2016-03-01 12:47:08 -07:00
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getSubOptions = prefix: elemType.getSubOptions (prefix ++ ["<name>"]);
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2014-08-29 08:42:44 -06:00
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getSubModules = elemType.getSubModules;
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substSubModules = m: attrsOf (elemType.substSubModules m);
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2016-09-06 19:03:32 -06:00
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functor = (defaultFunctor name) // { wrapped = elemType; };
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2009-06-26 07:53:31 -06:00
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};
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2011-06-13 20:41:13 -06:00
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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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2013-10-30 07:21:41 -06:00
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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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2014-02-20 08:40:49 -07:00
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{ name = elem.name or "unnamed-${toString defIdx}.${toString elemIdx}";
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2013-10-30 07:21:41 -06:00
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value = elem;
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}) def.value);
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}
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2011-06-13 20:41:13 -06:00
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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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2016-09-06 19:03:32 -06:00
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in mkOptionType rec {
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name = "loaOf";
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description = "list or attribute set of ${elemType.description}s";
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2014-05-01 18:17:03 -06:00
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check = x: isList x || isAttrs x;
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2016-03-01 12:47:08 -07:00
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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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2014-08-29 08:42:44 -06:00
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getSubModules = elemType.getSubModules;
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substSubModules = m: loaOf (elemType.substSubModules m);
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2016-09-06 19:03:32 -06:00
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functor = (defaultFunctor name) // { wrapped = elemType; };
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2013-10-27 17:56:22 -06:00
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};
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2011-06-13 20:41:13 -06:00
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2015-08-17 11:55:35 -06:00
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# List or element of ...
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2016-09-06 19:03:32 -06:00
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loeOf = elemType: mkOptionType rec {
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name = "loeOf";
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description = "element or list of ${elemType.description}s";
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2015-08-17 11:55:35 -06:00
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check = x: isList x || elemType.check x;
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2016-03-01 12:47:08 -07:00
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merge = loc: defs:
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2015-08-17 11:55:35 -06:00
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let
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defs' = filterOverrides defs;
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res = (head defs').value;
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in
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if isList res then concatLists (getValues defs')
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else if lessThan 1 (length defs') then
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throw "The option `${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;
|
2016-09-06 19:03:32 -06:00
|
|
|
|
functor = (defaultFunctor name) // { wrapped = elemType; };
|
2015-08-17 11:55:35 -06:00
|
|
|
|
};
|
|
|
|
|
|
2016-09-06 19:03:32 -06:00
|
|
|
|
uniq = elemType: mkOptionType rec {
|
|
|
|
|
name = "uniq";
|
|
|
|
|
inherit (elemType) description check;
|
2013-10-28 12:48:30 -06:00
|
|
|
|
merge = mergeOneOption;
|
2013-10-28 07:25:58 -06:00
|
|
|
|
getSubOptions = elemType.getSubOptions;
|
2014-08-29 08:42:44 -06:00
|
|
|
|
getSubModules = elemType.getSubModules;
|
|
|
|
|
substSubModules = m: uniq (elemType.substSubModules m);
|
2016-09-06 19:03:32 -06:00
|
|
|
|
functor = (defaultFunctor name) // { wrapped = elemType; };
|
2009-06-26 07:53:31 -06:00
|
|
|
|
};
|
|
|
|
|
|
2016-09-06 19:03:32 -06:00
|
|
|
|
nullOr = elemType: mkOptionType rec {
|
|
|
|
|
name = "nullOr";
|
|
|
|
|
description = "null or ${elemType.description}";
|
2015-12-03 21:22:57 -07:00
|
|
|
|
check = x: x == null || elemType.check x;
|
2016-03-01 12:47:08 -07:00
|
|
|
|
merge = loc: defs:
|
2015-12-03 21:22:57 -07:00
|
|
|
|
let nrNulls = count (def: def.value == null) defs; in
|
2013-10-30 07:21:41 -06:00
|
|
|
|
if nrNulls == length defs then null
|
|
|
|
|
else if nrNulls != 0 then
|
|
|
|
|
throw "The option `${showOption loc}' is defined both null and not null, in ${showFiles (getFiles defs)}."
|
2016-03-01 12:47:08 -07:00
|
|
|
|
else elemType.merge loc defs;
|
2013-10-28 07:25:58 -06:00
|
|
|
|
getSubOptions = elemType.getSubOptions;
|
2014-08-29 08:42:44 -06:00
|
|
|
|
getSubModules = elemType.getSubModules;
|
|
|
|
|
substSubModules = m: nullOr (elemType.substSubModules m);
|
2016-09-06 19:03:32 -06:00
|
|
|
|
functor = (defaultFunctor name) // { wrapped = elemType; };
|
2009-06-26 07:53:31 -06:00
|
|
|
|
};
|
|
|
|
|
|
2014-02-13 10:08:05 -07:00
|
|
|
|
submodule = opts:
|
2013-10-30 12:12:25 -06:00
|
|
|
|
let
|
|
|
|
|
opts' = toList opts;
|
|
|
|
|
inherit (import ./modules.nix) evalModules;
|
|
|
|
|
in
|
2013-10-28 07:25:58 -06:00
|
|
|
|
mkOptionType rec {
|
|
|
|
|
name = "submodule";
|
2013-11-12 05:48:19 -07:00
|
|
|
|
check = x: isAttrs x || isFunction x;
|
2016-03-01 12:47:08 -07:00
|
|
|
|
merge = loc: defs:
|
2013-10-28 07:25:58 -06:00
|
|
|
|
let
|
2013-11-12 05:48:19 -07:00
|
|
|
|
coerce = def: if isFunction def then def else { config = def; };
|
2016-03-01 12:47:08 -07:00
|
|
|
|
modules = opts' ++ map (def: { _file = def.file; imports = [(coerce def.value)]; }) defs;
|
2014-05-05 14:30:51 -06:00
|
|
|
|
in (evalModules {
|
|
|
|
|
inherit modules;
|
2016-03-01 12:47:08 -07:00
|
|
|
|
args.name = last loc;
|
2014-05-05 14:30:51 -06:00
|
|
|
|
prefix = loc;
|
|
|
|
|
}).config;
|
2016-03-01 12:47:08 -07:00
|
|
|
|
getSubOptions = prefix: (evalModules
|
|
|
|
|
{ modules = opts'; inherit prefix;
|
2013-10-28 08:48:20 -06:00
|
|
|
|
# FIXME: hack to get shit to evaluate.
|
2016-03-01 12:47:08 -07:00
|
|
|
|
args = { name = ""; }; }).options;
|
2014-08-29 08:42:44 -06:00
|
|
|
|
getSubModules = opts';
|
|
|
|
|
substSubModules = m: submodule m;
|
2016-09-06 19:03:32 -06:00
|
|
|
|
functor = (defaultFunctor name) // {
|
|
|
|
|
# Merging of submodules is done as part of mergeOptionDecls, as we have to annotate
|
|
|
|
|
# each submodule with its location.
|
|
|
|
|
payload = [];
|
|
|
|
|
binOp = lhs: rhs: [];
|
|
|
|
|
};
|
2013-10-28 07:25:58 -06:00
|
|
|
|
};
|
2013-10-27 17:56:22 -06:00
|
|
|
|
|
2016-03-01 12:47:08 -07:00
|
|
|
|
enum = values:
|
|
|
|
|
let
|
|
|
|
|
show = v:
|
|
|
|
|
if builtins.isString v then ''"${v}"''
|
|
|
|
|
else if builtins.isInt v then builtins.toString v
|
|
|
|
|
else ''<${builtins.typeOf v}>'';
|
|
|
|
|
in
|
2016-09-06 19:03:32 -06:00
|
|
|
|
mkOptionType rec {
|
|
|
|
|
name = "enum";
|
|
|
|
|
description = "one of ${concatMapStringsSep ", " show values}";
|
2016-03-01 12:47:08 -07:00
|
|
|
|
check = flip elem values;
|
|
|
|
|
merge = mergeOneOption;
|
2016-09-06 19:03:32 -06:00
|
|
|
|
functor = (defaultFunctor name) // { payload = values; binOp = a: b: unique (a ++ b); };
|
2016-03-01 12:47:08 -07:00
|
|
|
|
};
|
2014-05-01 09:30:20 -06:00
|
|
|
|
|
2016-09-06 19:03:32 -06:00
|
|
|
|
either = t1: t2: mkOptionType rec {
|
|
|
|
|
name = "either";
|
|
|
|
|
description = "${t1.description} or ${t2.description}";
|
2016-03-01 12:47:08 -07:00
|
|
|
|
check = x: t1.check x || t2.check x;
|
2016-11-06 16:34:06 -07:00
|
|
|
|
merge = loc: defs:
|
|
|
|
|
let
|
|
|
|
|
defList = map (d: d.value) defs;
|
|
|
|
|
in
|
|
|
|
|
if all (x: t1.check x) defList
|
|
|
|
|
then t1.merge loc defs
|
|
|
|
|
else if all (x: t2.check x) defList
|
|
|
|
|
then t2.merge loc defs
|
|
|
|
|
else mergeOneOption loc defs;
|
2016-09-06 19:03:32 -06:00
|
|
|
|
typeMerge = f':
|
|
|
|
|
let mt1 = t1.typeMerge (elemAt f'.wrapped 0).functor;
|
|
|
|
|
mt2 = t2.typeMerge (elemAt f'.wrapped 1).functor;
|
|
|
|
|
in
|
|
|
|
|
if (name == f'.name) && (mt1 != null) && (mt2 != null)
|
|
|
|
|
then functor.type mt1 mt2
|
|
|
|
|
else null;
|
|
|
|
|
functor = (defaultFunctor name) // { wrapped = [ t1 t2 ]; };
|
2016-03-01 12:47:08 -07:00
|
|
|
|
};
|
2014-08-19 05:13:51 -06:00
|
|
|
|
|
2017-01-13 18:14:01 -07:00
|
|
|
|
coercedTo = coercedType: coerceFunc: finalType:
|
|
|
|
|
assert coercedType.getSubModules == null;
|
|
|
|
|
mkOptionType rec {
|
|
|
|
|
name = "coercedTo";
|
|
|
|
|
description = "${finalType.description} or ${coercedType.description}";
|
|
|
|
|
check = x: finalType.check x || coercedType.check x;
|
|
|
|
|
merge = loc: defs:
|
|
|
|
|
let
|
|
|
|
|
coerceVal = val:
|
|
|
|
|
if finalType.check val then val
|
|
|
|
|
else let
|
|
|
|
|
coerced = coerceFunc val;
|
|
|
|
|
in assert finalType.check coerced; coerced;
|
|
|
|
|
|
|
|
|
|
in finalType.merge loc (map (def: def // { value = coerceVal def.value; }) defs);
|
|
|
|
|
getSubOptions = finalType.getSubOptions;
|
|
|
|
|
getSubModules = finalType.getSubModules;
|
|
|
|
|
substSubModules = m: coercedTo coercedType coerceFunc (finalType.substSubModules m);
|
|
|
|
|
typeMerge = t1: t2: null;
|
|
|
|
|
functor = (defaultFunctor name) // { wrapped = finalType; };
|
|
|
|
|
};
|
|
|
|
|
|
2013-10-27 17:56:22 -06:00
|
|
|
|
# Obsolete alternative to configOf. It takes its option
|
|
|
|
|
# declarations from the ‘options’ attribute of containing option
|
|
|
|
|
# declaration.
|
|
|
|
|
optionSet = mkOptionType {
|
2016-09-06 19:03:32 -06:00
|
|
|
|
name = builtins.trace "types.optionSet is deprecated; use types.submodule instead" "optionSet";
|
|
|
|
|
description = "option set";
|
2009-06-26 07:53:31 -06:00
|
|
|
|
};
|
|
|
|
|
|
2013-10-30 08:33:20 -06:00
|
|
|
|
# Augment the given type with an additional type check function.
|
|
|
|
|
addCheck = elemType: check: elemType // { check = x: elemType.check x && check x; };
|
|
|
|
|
|
2009-06-26 07:53:31 -06:00
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
}
|