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693 lines
27 KiB
Nix
693 lines
27 KiB
Nix
{ lib }:
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with lib.lists;
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with lib.strings;
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with lib.trivial;
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with lib.attrsets;
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with lib.options;
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with lib.debug;
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with lib.types;
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rec {
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/* Evaluate a set of modules. The result is a set of two
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attributes: ‘options’: the nested set of all option declarations,
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and ‘config’: the nested set of all option values.
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!!! Please think twice before adding to this argument list! The more
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that is specified here instead of in the modules themselves the harder
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it is to transparently move a set of modules to be a submodule of another
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config (as the proper arguments need to be replicated at each call to
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evalModules) and the less declarative the module set is. */
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evalModules = { modules
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, prefix ? []
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, # This should only be used for special arguments that need to be evaluated
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# when resolving module structure (like in imports). For everything else,
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# there's _module.args. If specialArgs.modulesPath is defined it will be
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# used as the base path for disabledModules.
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specialArgs ? {}
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, # This would be remove in the future, Prefer _module.args option instead.
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args ? {}
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, # This would be remove in the future, Prefer _module.check option instead.
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check ? true
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}:
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let
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# This internal module declare internal options under the `_module'
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# attribute. These options are fragile, as they are used by the
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# module system to change the interpretation of modules.
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internalModule = rec {
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_file = ./modules.nix;
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key = _file;
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options = {
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_module.args = mkOption {
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type = types.attrsOf types.unspecified;
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internal = true;
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description = "Arguments passed to each module.";
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};
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_module.check = mkOption {
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type = types.bool;
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internal = true;
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default = check;
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description = "Whether to check whether all option definitions have matching declarations.";
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};
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};
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config = {
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_module.args = args;
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};
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};
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closed = closeModules (modules ++ [ internalModule ]) ({ inherit config options lib; } // specialArgs);
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options = mergeModules prefix (reverseList (filterModules (specialArgs.modulesPath or "") closed));
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# Traverse options and extract the option values into the final
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# config set. At the same time, check whether all option
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# definitions have matching declarations.
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# !!! _module.check's value can't depend on any other config values
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# without an infinite recursion. One way around this is to make the
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# 'config' passed around to the modules be unconditionally unchecked,
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# and only do the check in 'result'.
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config = yieldConfig prefix options;
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yieldConfig = prefix: set:
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let res = removeAttrs (mapAttrs (n: v:
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if isOption v then v.value
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else yieldConfig (prefix ++ [n]) v) set) ["_definedNames"];
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in
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if options._module.check.value && set ? _definedNames then
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foldl' (res: m:
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foldl' (res: name:
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if set ? ${name} then res else throw "The option `${showOption (prefix ++ [name])}' defined in `${m.file}' does not exist.")
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res m.names)
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res set._definedNames
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else
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res;
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result = { inherit options config; };
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in result;
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# Filter disabled modules. Modules can be disabled allowing
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# their implementation to be replaced.
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filterModules = modulesPath: modules:
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let
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moduleKey = m: if isString m then toString modulesPath + "/" + m else toString m;
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disabledKeys = map moduleKey (concatMap (m: m.disabledModules) modules);
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in
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filter (m: !(elem m.key disabledKeys)) modules;
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/* Close a set of modules under the ‘imports’ relation. */
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closeModules = modules: args:
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let
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toClosureList = file: parentKey: imap1 (n: x:
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if isAttrs x || isFunction x then
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let key = "${parentKey}:anon-${toString n}"; in
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unifyModuleSyntax file key (unpackSubmodule (applyIfFunction key) x args)
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else
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let file = toString x; key = toString x; in
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unifyModuleSyntax file key (applyIfFunction key (import x) args));
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in
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builtins.genericClosure {
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startSet = toClosureList unknownModule "" modules;
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operator = m: toClosureList m.file m.key m.imports;
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};
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/* Massage a module into canonical form, that is, a set consisting
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of ‘options’, ‘config’ and ‘imports’ attributes. */
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unifyModuleSyntax = file: key: m:
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let metaSet = if m ? meta
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then { meta = m.meta; }
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else {};
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in
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if m ? config || m ? options then
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let badAttrs = removeAttrs m ["_file" "key" "disabledModules" "imports" "options" "config" "meta"]; in
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if badAttrs != {} then
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throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'. This is caused by assignments to the top-level attributes `config' or `options'."
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else
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{ file = m._file or file;
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key = toString m.key or key;
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disabledModules = m.disabledModules or [];
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imports = m.imports or [];
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options = m.options or {};
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config = mkMerge [ (m.config or {}) metaSet ];
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}
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else
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{ file = m._file or file;
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key = toString m.key or key;
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disabledModules = m.disabledModules or [];
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imports = m.require or [] ++ m.imports or [];
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options = {};
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config = mkMerge [ (removeAttrs m ["_file" "key" "disabledModules" "require" "imports"]) metaSet ];
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};
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applyIfFunction = key: f: args@{ config, options, lib, ... }: if isFunction f then
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let
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# Module arguments are resolved in a strict manner when attribute set
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# deconstruction is used. As the arguments are now defined with the
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# config._module.args option, the strictness used on the attribute
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# set argument would cause an infinite loop, if the result of the
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# option is given as argument.
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#
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# To work-around the strictness issue on the deconstruction of the
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# attributes set argument, we create a new attribute set which is
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# constructed to satisfy the expected set of attributes. Thus calling
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# a module will resolve strictly the attributes used as argument but
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# not their values. The values are forwarding the result of the
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# evaluation of the option.
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requiredArgs = builtins.attrNames (lib.functionArgs f);
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context = name: ''while evaluating the module argument `${name}' in "${key}":'';
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extraArgs = builtins.listToAttrs (map (name: {
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inherit name;
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value = builtins.addErrorContext (context name)
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(args.${name} or config._module.args.${name});
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}) requiredArgs);
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# Note: we append in the opposite order such that we can add an error
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# context on the explicited arguments of "args" too. This update
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# operator is used to make the "args@{ ... }: with args.lib;" notation
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# works.
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in f (args // extraArgs)
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else
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f;
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/* We have to pack and unpack submodules. We cannot wrap the expected
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result of the function as we would no longer be able to list the arguments
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of the submodule. (see applyIfFunction) */
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unpackSubmodule = unpack: m: args:
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if isType "submodule" m then
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{ _file = m.file; } // (unpack m.submodule args)
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else unpack m args;
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packSubmodule = file: m:
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{ _type = "submodule"; file = file; submodule = m; };
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/* Merge a list of modules. This will recurse over the option
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declarations in all modules, combining them into a single set.
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At the same time, for each option declaration, it will merge the
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corresponding option definitions in all machines, returning them
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in the ‘value’ attribute of each option. */
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mergeModules = prefix: modules:
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mergeModules' prefix modules
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(concatMap (m: map (config: { inherit (m) file; inherit config; }) (pushDownProperties m.config)) modules);
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mergeModules' = prefix: options: configs:
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listToAttrs (map (name: {
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# We're descending into attribute ‘name’.
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inherit name;
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value =
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let
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loc = prefix ++ [name];
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# Get all submodules that declare ‘name’.
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decls = concatMap (m:
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if m.options ? ${name}
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then [ { inherit (m) file; options = m.options.${name}; } ]
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else []
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) options;
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# Get all submodules that define ‘name’.
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defns = concatMap (m:
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if m.config ? ${name}
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then map (config: { inherit (m) file; inherit config; })
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(pushDownProperties m.config.${name})
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else []
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) configs;
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nrOptions = count (m: isOption m.options) decls;
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# Extract the definitions for this loc
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defns' = map (m: { inherit (m) file; value = m.config.${name}; })
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(filter (m: m.config ? ${name}) configs);
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in
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if nrOptions == length decls then
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let opt = fixupOptionType loc (mergeOptionDecls loc decls);
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in evalOptionValue loc opt defns'
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else if nrOptions != 0 then
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let
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firstOption = findFirst (m: isOption m.options) "" decls;
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firstNonOption = findFirst (m: !isOption m.options) "" decls;
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in
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throw "The option `${showOption loc}' in `${firstOption.file}' is a prefix of options in `${firstNonOption.file}'."
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else
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mergeModules' loc decls defns;
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}) (concatMap (m: attrNames m.options) options))
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// { _definedNames = map (m: { inherit (m) file; names = attrNames m.config; }) configs; };
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/* Merge multiple option declarations into a single declaration. In
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general, there should be only one declaration of each option.
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The exception is the ‘options’ attribute, which specifies
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sub-options. These can be specified multiple times to allow one
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module to add sub-options to an option declared somewhere else
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(e.g. multiple modules define sub-options for ‘fileSystems’).
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'loc' is the list of attribute names where the option is located.
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'opts' is a list of modules. Each module has an options attribute which
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correspond to the definition of 'loc' in 'opt.file'. */
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mergeOptionDecls = loc: opts:
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foldl' (res: opt:
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let t = res.type;
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t' = opt.options.type;
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mergedType = t.typeMerge t'.functor;
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typesMergeable = mergedType != null;
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typeSet = if (bothHave "type") && typesMergeable
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then { type = mergedType; }
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else {};
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bothHave = k: opt.options ? ${k} && res ? ${k};
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in
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if bothHave "default" ||
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bothHave "example" ||
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bothHave "description" ||
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bothHave "apply" ||
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(bothHave "type" && (! typesMergeable))
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then
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throw "The option `${showOption loc}' in `${opt.file}' is already declared in ${showFiles res.declarations}."
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else
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let
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/* Add the modules of the current option to the list of modules
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already collected. The options attribute except either a list of
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submodules or a submodule. For each submodule, we add the file of the
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current option declaration as the file use for the submodule. If the
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submodule defines any filename, then we ignore the enclosing option file. */
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options' = toList opt.options.options;
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coerceOption = file: opt:
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if isFunction opt then packSubmodule file opt
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else packSubmodule file { options = opt; };
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getSubModules = opt.options.type.getSubModules or null;
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submodules =
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if getSubModules != null then map (packSubmodule opt.file) getSubModules ++ res.options
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else if opt.options ? options then map (coerceOption opt.file) options' ++ res.options
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else res.options;
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in opt.options // res //
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{ declarations = res.declarations ++ [opt.file];
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options = submodules;
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} // typeSet
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) { inherit loc; declarations = []; options = []; } opts;
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/* Merge all the definitions of an option to produce the final
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config value. */
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evalOptionValue = loc: opt: defs:
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let
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# Add in the default value for this option, if any.
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defs' =
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(optional (opt ? default)
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{ file = head opt.declarations; value = mkOptionDefault opt.default; }) ++ defs;
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# Handle properties, check types, and merge everything together.
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res =
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if opt.readOnly or false && length defs' > 1 then
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throw "The option `${showOption loc}' is read-only, but it's set multiple times."
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else
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mergeDefinitions loc opt.type defs';
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# Check whether the option is defined, and apply the ‘apply’
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# function to the merged value. This allows options to yield a
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# value computed from the definitions.
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value =
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if !res.isDefined then
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throw "The option `${showOption loc}' is used but not defined."
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else if opt ? apply then
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opt.apply res.mergedValue
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else
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res.mergedValue;
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in opt //
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{ value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
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inherit (res.defsFinal') highestPrio;
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definitions = map (def: def.value) res.defsFinal;
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files = map (def: def.file) res.defsFinal;
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inherit (res) isDefined;
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};
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# Merge definitions of a value of a given type.
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mergeDefinitions = loc: type: defs: rec {
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defsFinal' =
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let
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# Process mkMerge and mkIf properties.
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defs' = concatMap (m:
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map (value: { inherit (m) file; inherit value; }) (dischargeProperties m.value)
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) defs;
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# Process mkOverride properties.
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defs'' = filterOverrides' defs';
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# Sort mkOrder properties.
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defs''' =
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# Avoid sorting if we don't have to.
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if any (def: def.value._type or "" == "order") defs''.values
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then sortProperties defs''.values
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else defs''.values;
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in {
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values = defs''';
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inherit (defs'') highestPrio;
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};
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defsFinal = defsFinal'.values;
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# Type-check the remaining definitions, and merge them.
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mergedValue = foldl' (res: def:
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if type.check def.value then res
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else throw "The option value `${showOption loc}' in `${def.file}' is not of type `${type.description}'.")
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(type.merge loc defsFinal) defsFinal;
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isDefined = defsFinal != [];
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optionalValue =
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if isDefined then { value = mergedValue; }
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else {};
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};
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/* Given a config set, expand mkMerge properties, and push down the
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other properties into the children. The result is a list of
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config sets that do not have properties at top-level. For
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example,
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mkMerge [ { boot = set1; } (mkIf cond { boot = set2; services = set3; }) ]
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is transformed into
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[ { boot = set1; } { boot = mkIf cond set2; services = mkIf cond set3; } ].
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This transform is the critical step that allows mkIf conditions
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to refer to the full configuration without creating an infinite
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recursion.
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*/
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pushDownProperties = cfg:
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if cfg._type or "" == "merge" then
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concatMap pushDownProperties cfg.contents
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else if cfg._type or "" == "if" then
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map (mapAttrs (n: v: mkIf cfg.condition v)) (pushDownProperties cfg.content)
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else if cfg._type or "" == "override" then
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map (mapAttrs (n: v: mkOverride cfg.priority v)) (pushDownProperties cfg.content)
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else # FIXME: handle mkOrder?
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[ cfg ];
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/* Given a config value, expand mkMerge properties, and discharge
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any mkIf conditions. That is, this is the place where mkIf
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conditions are actually evaluated. The result is a list of
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config values. For example, ‘mkIf false x’ yields ‘[]’,
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‘mkIf true x’ yields ‘[x]’, and
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mkMerge [ 1 (mkIf true 2) (mkIf true (mkIf false 3)) ]
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yields ‘[ 1 2 ]’.
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*/
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dischargeProperties = def:
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if def._type or "" == "merge" then
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concatMap dischargeProperties def.contents
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else if def._type or "" == "if" then
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if isBool def.condition then
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if def.condition then
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dischargeProperties def.content
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else
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[ ]
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else
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throw "‘mkIf’ called with a non-Boolean condition"
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else
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[ def ];
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/* Given a list of config values, process the mkOverride properties,
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that is, return the values that have the highest (that is,
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numerically lowest) priority, and strip the mkOverride
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properties. For example,
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[ { file = "/1"; value = mkOverride 10 "a"; }
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{ file = "/2"; value = mkOverride 20 "b"; }
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{ file = "/3"; value = "z"; }
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{ file = "/4"; value = mkOverride 10 "d"; }
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]
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yields
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[ { file = "/1"; value = "a"; }
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{ file = "/4"; value = "d"; }
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]
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Note that "z" has the default priority 100.
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*/
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filterOverrides = defs: (filterOverrides' defs).values;
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filterOverrides' = defs:
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let
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defaultPrio = 100;
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getPrio = def: if def.value._type or "" == "override" then def.value.priority else defaultPrio;
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highestPrio = foldl' (prio: def: min (getPrio def) prio) 9999 defs;
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strip = def: if def.value._type or "" == "override" then def // { value = def.value.content; } else def;
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in {
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values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
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inherit highestPrio;
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};
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/* Sort a list of properties. The sort priority of a property is
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1000 by default, but can be overridden by wrapping the property
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using mkOrder. */
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sortProperties = defs:
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let
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strip = def:
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if def.value._type or "" == "order"
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then def // { value = def.value.content; inherit (def.value) priority; }
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else def;
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defs' = map strip defs;
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compare = a: b: (a.priority or 1000) < (b.priority or 1000);
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in sort compare defs';
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/* Hack for backward compatibility: convert options of type
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optionSet to options of type submodule. FIXME: remove
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eventually. */
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fixupOptionType = loc: opt:
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let
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options = opt.options or
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(throw "Option `${showOption loc'}' has type optionSet but has no option attribute, in ${showFiles opt.declarations}.");
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f = tp:
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let optionSetIn = type: (tp.name == type) && (tp.functor.wrapped.name == "optionSet");
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in
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if tp.name == "option set" || tp.name == "submodule" then
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throw "The option ${showOption loc} uses submodules without a wrapping type, in ${showFiles opt.declarations}."
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else if optionSetIn "attrsOf" then types.attrsOf (types.submodule options)
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else if optionSetIn "loaOf" then types.loaOf (types.submodule options)
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else if optionSetIn "listOf" then types.listOf (types.submodule options)
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else if optionSetIn "nullOr" then types.nullOr (types.submodule options)
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else tp;
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in
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if opt.type.getSubModules or null == null
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then opt // { type = f (opt.type or types.unspecified); }
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else opt // { type = opt.type.substSubModules opt.options; options = []; };
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/* Properties. */
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mkIf = condition: content:
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{ _type = "if";
|
||
inherit condition content;
|
||
};
|
||
|
||
mkAssert = assertion: message: content:
|
||
mkIf
|
||
(if assertion then true else throw "\nFailed assertion: ${message}")
|
||
content;
|
||
|
||
mkMerge = contents:
|
||
{ _type = "merge";
|
||
inherit contents;
|
||
};
|
||
|
||
mkOverride = priority: content:
|
||
{ _type = "override";
|
||
inherit priority content;
|
||
};
|
||
|
||
mkOptionDefault = mkOverride 1500; # priority of option defaults
|
||
mkDefault = mkOverride 1000; # used in config sections of non-user modules to set a default
|
||
mkForce = mkOverride 50;
|
||
mkVMOverride = mkOverride 10; # used by ‘nixos-rebuild build-vm’
|
||
|
||
mkStrict = builtins.trace "`mkStrict' is obsolete; use `mkOverride 0' instead." (mkOverride 0);
|
||
|
||
mkFixStrictness = id; # obsolete, no-op
|
||
|
||
mkOrder = priority: content:
|
||
{ _type = "order";
|
||
inherit priority content;
|
||
};
|
||
|
||
mkBefore = mkOrder 500;
|
||
mkAfter = mkOrder 1500;
|
||
|
||
|
||
# Convenient property used to transfer all definitions and their
|
||
# properties from one option to another. This property is useful for
|
||
# renaming options, and also for including properties from another module
|
||
# system, including sub-modules.
|
||
#
|
||
# { config, options, ... }:
|
||
#
|
||
# {
|
||
# # 'bar' might not always be defined in the current module-set.
|
||
# config.foo.enable = mkAliasDefinitions (options.bar.enable or {});
|
||
#
|
||
# # 'barbaz' has to be defined in the current module-set.
|
||
# config.foobar.paths = mkAliasDefinitions options.barbaz.paths;
|
||
# }
|
||
#
|
||
# Note, this is different than taking the value of the option and using it
|
||
# as a definition, as the new definition will not keep the mkOverride /
|
||
# mkDefault properties of the previous option.
|
||
#
|
||
mkAliasDefinitions = mkAliasAndWrapDefinitions id;
|
||
mkAliasAndWrapDefinitions = wrap: option:
|
||
mkIf (isOption option && option.isDefined) (wrap (mkMerge option.definitions));
|
||
|
||
|
||
/* Compatibility. */
|
||
fixMergeModules = modules: args: evalModules { inherit modules args; check = false; };
|
||
|
||
|
||
/* Return a module that causes a warning to be shown if the
|
||
specified option is defined. For example,
|
||
|
||
mkRemovedOptionModule [ "boot" "loader" "grub" "bootDevice" ] "<replacement instructions>"
|
||
|
||
causes a warning if the user defines boot.loader.grub.bootDevice.
|
||
|
||
replacementInstructions is a string that provides instructions on
|
||
how to achieve the same functionality without the removed option,
|
||
or alternatively a reasoning why the functionality is not needed.
|
||
replacementInstructions SHOULD be provided!
|
||
*/
|
||
mkRemovedOptionModule = optionName: replacementInstructions:
|
||
{ options, ... }:
|
||
{ options = setAttrByPath optionName (mkOption {
|
||
visible = false;
|
||
});
|
||
config.warnings =
|
||
let opt = getAttrFromPath optionName options; in
|
||
optional opt.isDefined ''
|
||
The option definition `${showOption optionName}' in ${showFiles opt.files} no longer has any effect; please remove it.
|
||
${replacementInstructions}'';
|
||
};
|
||
|
||
/* Return a module that causes a warning to be shown if the
|
||
specified "from" option is defined; the defined value is however
|
||
forwarded to the "to" option. This can be used to rename options
|
||
while providing backward compatibility. For example,
|
||
|
||
mkRenamedOptionModule [ "boot" "copyKernels" ] [ "boot" "loader" "grub" "copyKernels" ]
|
||
|
||
forwards any definitions of boot.copyKernels to
|
||
boot.loader.grub.copyKernels while printing a warning.
|
||
*/
|
||
mkRenamedOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = false;
|
||
warn = true;
|
||
use = builtins.trace "Obsolete option `${showOption from}' is used. It was renamed to `${showOption to}'.";
|
||
};
|
||
|
||
/* Return a module that causes a warning to be shown if any of the "from"
|
||
option is defined; the defined values can be used in the "mergeFn" to set
|
||
the "to" value.
|
||
This function can be used to merge multiple options into one that has a
|
||
different type.
|
||
|
||
"mergeFn" takes the module "config" as a parameter and must return a value
|
||
of "to" option type.
|
||
|
||
mkMergedOptionModule
|
||
[ [ "a" "b" "c" ]
|
||
[ "d" "e" "f" ] ]
|
||
[ "x" "y" "z" ]
|
||
(config:
|
||
let value = p: getAttrFromPath p config;
|
||
in
|
||
if (value [ "a" "b" "c" ]) == true then "foo"
|
||
else if (value [ "d" "e" "f" ]) == true then "bar"
|
||
else "baz")
|
||
|
||
- options.a.b.c is a removed boolean option
|
||
- options.d.e.f is a removed boolean option
|
||
- options.x.y.z is a new str option that combines a.b.c and d.e.f
|
||
functionality
|
||
|
||
This show a warning if any a.b.c or d.e.f is set, and set the value of
|
||
x.y.z to the result of the merge function
|
||
*/
|
||
mkMergedOptionModule = from: to: mergeFn:
|
||
{ config, options, ... }:
|
||
{
|
||
options = foldl recursiveUpdate {} (map (path: setAttrByPath path (mkOption {
|
||
visible = false;
|
||
# To use the value in mergeFn without triggering errors
|
||
default = "_mkMergedOptionModule";
|
||
})) from);
|
||
|
||
config = {
|
||
warnings = filter (x: x != "") (map (f:
|
||
let val = getAttrFromPath f config;
|
||
opt = getAttrFromPath f options;
|
||
in
|
||
optionalString
|
||
(val != "_mkMergedOptionModule")
|
||
"The option `${showOption f}' defined in ${showFiles opt.files} has been changed to `${showOption to}' that has a different type. Please read `${showOption to}' documentation and update your configuration accordingly."
|
||
) from);
|
||
} // setAttrByPath to (mkMerge
|
||
(optional
|
||
(any (f: (getAttrFromPath f config) != "_mkMergedOptionModule") from)
|
||
(mergeFn config)));
|
||
};
|
||
|
||
/* Single "from" version of mkMergedOptionModule.
|
||
Return a module that causes a warning to be shown if the "from" option is
|
||
defined; the defined value can be used in the "mergeFn" to set the "to"
|
||
value.
|
||
This function can be used to change an option into another that has a
|
||
different type.
|
||
|
||
"mergeFn" takes the module "config" as a parameter and must return a value of
|
||
"to" option type.
|
||
|
||
mkChangedOptionModule [ "a" "b" "c" ] [ "x" "y" "z" ]
|
||
(config:
|
||
let value = getAttrFromPath [ "a" "b" "c" ] config;
|
||
in
|
||
if value > 100 then "high"
|
||
else "normal")
|
||
|
||
- options.a.b.c is a removed int option
|
||
- options.x.y.z is a new str option that supersedes a.b.c
|
||
|
||
This show a warning if a.b.c is set, and set the value of x.y.z to the
|
||
result of the change function
|
||
*/
|
||
mkChangedOptionModule = from: to: changeFn:
|
||
mkMergedOptionModule [ from ] to changeFn;
|
||
|
||
/* Like ‘mkRenamedOptionModule’, but doesn't show a warning. */
|
||
mkAliasOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = true;
|
||
warn = false;
|
||
use = id;
|
||
};
|
||
|
||
doRename = { from, to, visible, warn, use }:
|
||
{ config, options, ... }:
|
||
let
|
||
fromOpt = getAttrFromPath from options;
|
||
toOpt = getAttrFromPath to options;
|
||
toOf = attrByPath to
|
||
(abort "Renaming error: option `${showOption to}' does not exist.");
|
||
in
|
||
{
|
||
options = setAttrByPath from (mkOption {
|
||
inherit visible;
|
||
description = "Alias of <option>${showOption to}</option>.";
|
||
apply = x: use (toOf config);
|
||
});
|
||
config = mkMerge [
|
||
{
|
||
warnings = optional (warn && fromOpt.isDefined)
|
||
"The option `${showOption from}' defined in ${showFiles fromOpt.files} has been renamed to `${showOption to}'.";
|
||
}
|
||
(mkAliasAndWrapDefinitions (setAttrByPath to) fromOpt)
|
||
];
|
||
};
|
||
|
||
}
|