946 lines
36 KiB
Nix
946 lines
36 KiB
Nix
{ lib }:
|
||
|
||
let
|
||
inherit (lib)
|
||
all
|
||
any
|
||
attrByPath
|
||
attrNames
|
||
catAttrs
|
||
concatLists
|
||
concatMap
|
||
count
|
||
elem
|
||
filter
|
||
findFirst
|
||
flip
|
||
foldl
|
||
foldl'
|
||
getAttrFromPath
|
||
head
|
||
id
|
||
imap1
|
||
isAttrs
|
||
isBool
|
||
isFunction
|
||
isList
|
||
isString
|
||
length
|
||
mapAttrs
|
||
mapAttrsToList
|
||
mapAttrsRecursiveCond
|
||
min
|
||
optional
|
||
optionalAttrs
|
||
optionalString
|
||
recursiveUpdate
|
||
reverseList sort
|
||
setAttrByPath
|
||
toList
|
||
types
|
||
warnIf
|
||
;
|
||
inherit (lib.options)
|
||
isOption
|
||
mkOption
|
||
showDefs
|
||
showFiles
|
||
showOption
|
||
unknownModule
|
||
;
|
||
in
|
||
|
||
rec {
|
||
|
||
/* Evaluate a set of modules. The result is a set of two
|
||
attributes: ‘options’: the nested set of all option declarations,
|
||
and ‘config’: the nested set of all option values.
|
||
!!! Please think twice before adding to this argument list! The more
|
||
that is specified here instead of in the modules themselves the harder
|
||
it is to transparently move a set of modules to be a submodule of another
|
||
config (as the proper arguments need to be replicated at each call to
|
||
evalModules) and the less declarative the module set is. */
|
||
evalModules = { modules
|
||
, prefix ? []
|
||
, # This should only be used for special arguments that need to be evaluated
|
||
# when resolving module structure (like in imports). For everything else,
|
||
# there's _module.args. If specialArgs.modulesPath is defined it will be
|
||
# used as the base path for disabledModules.
|
||
specialArgs ? {}
|
||
, # This would be remove in the future, Prefer _module.args option instead.
|
||
args ? {}
|
||
, # This would be remove in the future, Prefer _module.check option instead.
|
||
check ? true
|
||
}:
|
||
let
|
||
# This internal module declare internal options under the `_module'
|
||
# attribute. These options are fragile, as they are used by the
|
||
# module system to change the interpretation of modules.
|
||
internalModule = rec {
|
||
_file = ./modules.nix;
|
||
|
||
key = _file;
|
||
|
||
options = {
|
||
_module.args = mkOption {
|
||
# Because things like `mkIf` are entirely useless for
|
||
# `_module.args` (because there's no way modules can check which
|
||
# arguments were passed), we'll use `lazyAttrsOf` which drops
|
||
# support for that, in turn it's lazy in its values. This means e.g.
|
||
# a `_module.args.pkgs = import (fetchTarball { ... }) {}` won't
|
||
# start a download when `pkgs` wasn't evaluated.
|
||
type = types.lazyAttrsOf types.unspecified;
|
||
internal = true;
|
||
description = "Arguments passed to each module.";
|
||
};
|
||
|
||
_module.check = mkOption {
|
||
type = types.bool;
|
||
internal = true;
|
||
default = check;
|
||
description = "Whether to check whether all option definitions have matching declarations.";
|
||
};
|
||
|
||
_module.freeformType = mkOption {
|
||
# Disallow merging for now, but could be implemented nicely with a `types.optionType`
|
||
type = types.nullOr (types.uniq types.attrs);
|
||
internal = true;
|
||
default = null;
|
||
description = ''
|
||
If set, merge all definitions that don't have an associated option
|
||
together using this type. The result then gets combined with the
|
||
values of all declared options to produce the final <literal>
|
||
config</literal> value.
|
||
|
||
If this is <literal>null</literal>, definitions without an option
|
||
will throw an error unless <option>_module.check</option> is
|
||
turned off.
|
||
'';
|
||
};
|
||
};
|
||
|
||
config = {
|
||
_module.args = args;
|
||
};
|
||
};
|
||
|
||
merged =
|
||
let collected = collectModules
|
||
(specialArgs.modulesPath or "")
|
||
(modules ++ [ internalModule ])
|
||
({ inherit lib options config specialArgs; } // specialArgs);
|
||
in mergeModules prefix (reverseList collected);
|
||
|
||
options = merged.matchedOptions;
|
||
|
||
config =
|
||
let
|
||
|
||
# For definitions that have an associated option
|
||
declaredConfig = mapAttrsRecursiveCond (v: ! isOption v) (_: v: v.value) options;
|
||
|
||
# If freeformType is set, this is for definitions that don't have an associated option
|
||
freeformConfig =
|
||
let
|
||
defs = map (def: {
|
||
file = def.file;
|
||
value = setAttrByPath def.prefix def.value;
|
||
}) merged.unmatchedDefns;
|
||
in if defs == [] then {}
|
||
else declaredConfig._module.freeformType.merge prefix defs;
|
||
|
||
in if declaredConfig._module.freeformType == null then declaredConfig
|
||
# Because all definitions that had an associated option ended in
|
||
# declaredConfig, freeformConfig can only contain the non-option
|
||
# paths, meaning recursiveUpdate will never override any value
|
||
else recursiveUpdate freeformConfig declaredConfig;
|
||
|
||
checkUnmatched =
|
||
if config._module.check && config._module.freeformType == null && merged.unmatchedDefns != [] then
|
||
let
|
||
firstDef = head merged.unmatchedDefns;
|
||
baseMsg = "The option `${showOption (prefix ++ firstDef.prefix)}' does not exist. Definition values:${showDefs [ firstDef ]}";
|
||
in
|
||
if attrNames options == [ "_module" ]
|
||
then throw ''
|
||
${baseMsg}
|
||
|
||
However there are no options defined in `${showOption prefix}'. Are you sure you've
|
||
declared your options properly? This can happen if you e.g. declared your options in `types.submodule'
|
||
under `config' rather than `options'.
|
||
''
|
||
else throw baseMsg
|
||
else null;
|
||
|
||
result = builtins.seq checkUnmatched {
|
||
inherit options;
|
||
config = removeAttrs config [ "_module" ];
|
||
inherit (config) _module;
|
||
};
|
||
in result;
|
||
|
||
# collectModules :: (modulesPath: String) -> (modules: [ Module ]) -> (args: Attrs) -> [ Module ]
|
||
#
|
||
# Collects all modules recursively through `import` statements, filtering out
|
||
# all modules in disabledModules.
|
||
collectModules = let
|
||
|
||
# Like unifyModuleSyntax, but also imports paths and calls functions if necessary
|
||
loadModule = args: fallbackFile: fallbackKey: m:
|
||
if isFunction m || isAttrs m then
|
||
unifyModuleSyntax fallbackFile fallbackKey (applyIfFunction fallbackKey m args)
|
||
else if isList m then
|
||
let defs = [{ file = fallbackFile; value = m; }]; in
|
||
throw "Module imports can't be nested lists. Perhaps you meant to remove one level of lists? Definitions: ${showDefs defs}"
|
||
else unifyModuleSyntax (toString m) (toString m) (applyIfFunction (toString m) (import m) args);
|
||
|
||
/*
|
||
Collects all modules recursively into the form
|
||
|
||
{
|
||
disabled = [ <list of disabled modules> ];
|
||
# All modules of the main module list
|
||
modules = [
|
||
{
|
||
key = <key1>;
|
||
module = <module for key1>;
|
||
# All modules imported by the module for key1
|
||
modules = [
|
||
{
|
||
key = <key1-1>;
|
||
module = <module for key1-1>;
|
||
# All modules imported by the module for key1-1
|
||
modules = [ ... ];
|
||
}
|
||
...
|
||
];
|
||
}
|
||
...
|
||
];
|
||
}
|
||
*/
|
||
collectStructuredModules =
|
||
let
|
||
collectResults = modules: {
|
||
disabled = concatLists (catAttrs "disabled" modules);
|
||
inherit modules;
|
||
};
|
||
in parentFile: parentKey: initialModules: args: collectResults (imap1 (n: x:
|
||
let
|
||
module = loadModule args parentFile "${parentKey}:anon-${toString n}" x;
|
||
collectedImports = collectStructuredModules module._file module.key module.imports args;
|
||
in {
|
||
key = module.key;
|
||
module = module;
|
||
modules = collectedImports.modules;
|
||
disabled = module.disabledModules ++ collectedImports.disabled;
|
||
}) initialModules);
|
||
|
||
# filterModules :: String -> { disabled, modules } -> [ Module ]
|
||
#
|
||
# Filters a structure as emitted by collectStructuredModules by removing all disabled
|
||
# modules recursively. It returns the final list of unique-by-key modules
|
||
filterModules = modulesPath: { disabled, modules }:
|
||
let
|
||
moduleKey = m: if isString m then toString modulesPath + "/" + m else toString m;
|
||
disabledKeys = map moduleKey disabled;
|
||
keyFilter = filter (attrs: ! elem attrs.key disabledKeys);
|
||
in map (attrs: attrs.module) (builtins.genericClosure {
|
||
startSet = keyFilter modules;
|
||
operator = attrs: keyFilter attrs.modules;
|
||
});
|
||
|
||
in modulesPath: initialModules: args:
|
||
filterModules modulesPath (collectStructuredModules unknownModule "" initialModules args);
|
||
|
||
/* Massage a module into canonical form, that is, a set consisting
|
||
of ‘options’, ‘config’ and ‘imports’ attributes. */
|
||
unifyModuleSyntax = file: key: m:
|
||
let
|
||
addMeta = config: if m ? meta
|
||
then mkMerge [ config { meta = m.meta; } ]
|
||
else config;
|
||
addFreeformType = config: if m ? freeformType
|
||
then mkMerge [ config { _module.freeformType = m.freeformType; } ]
|
||
else config;
|
||
in
|
||
if m ? config || m ? options then
|
||
let badAttrs = removeAttrs m ["_file" "key" "disabledModules" "imports" "options" "config" "meta" "freeformType"]; in
|
||
if badAttrs != {} then
|
||
throw "Module `${key}' has an unsupported attribute `${head (attrNames badAttrs)}'. This is caused by introducing a top-level `config' or `options' attribute. Add configuration attributes immediately on the top level instead, or move all of them (namely: ${toString (attrNames badAttrs)}) into the explicit `config' attribute."
|
||
else
|
||
{ _file = toString m._file or file;
|
||
key = toString m.key or key;
|
||
disabledModules = m.disabledModules or [];
|
||
imports = m.imports or [];
|
||
options = m.options or {};
|
||
config = addFreeformType (addMeta (m.config or {}));
|
||
}
|
||
else
|
||
{ _file = toString m._file or file;
|
||
key = toString m.key or key;
|
||
disabledModules = m.disabledModules or [];
|
||
imports = m.require or [] ++ m.imports or [];
|
||
options = {};
|
||
config = addFreeformType (addMeta (removeAttrs m ["_file" "key" "disabledModules" "require" "imports" "freeformType"]));
|
||
};
|
||
|
||
applyIfFunction = key: f: args@{ config, options, lib, ... }: if isFunction f then
|
||
let
|
||
# Module arguments are resolved in a strict manner when attribute set
|
||
# deconstruction is used. As the arguments are now defined with the
|
||
# config._module.args option, the strictness used on the attribute
|
||
# set argument would cause an infinite loop, if the result of the
|
||
# option is given as argument.
|
||
#
|
||
# To work-around the strictness issue on the deconstruction of the
|
||
# attributes set argument, we create a new attribute set which is
|
||
# constructed to satisfy the expected set of attributes. Thus calling
|
||
# a module will resolve strictly the attributes used as argument but
|
||
# not their values. The values are forwarding the result of the
|
||
# evaluation of the option.
|
||
context = name: ''while evaluating the module argument `${name}' in "${key}":'';
|
||
extraArgs = builtins.mapAttrs (name: _:
|
||
builtins.addErrorContext (context name)
|
||
(args.${name} or config._module.args.${name})
|
||
) (lib.functionArgs f);
|
||
|
||
# Note: we append in the opposite order such that we can add an error
|
||
# context on the explicited arguments of "args" too. This update
|
||
# operator is used to make the "args@{ ... }: with args.lib;" notation
|
||
# works.
|
||
in f (args // extraArgs)
|
||
else
|
||
f;
|
||
|
||
/* Merge a list of modules. This will recurse over the option
|
||
declarations in all modules, combining them into a single set.
|
||
At the same time, for each option declaration, it will merge the
|
||
corresponding option definitions in all machines, returning them
|
||
in the ‘value’ attribute of each option.
|
||
|
||
This returns a set like
|
||
{
|
||
# A recursive set of options along with their final values
|
||
matchedOptions = {
|
||
foo = { _type = "option"; value = "option value of foo"; ... };
|
||
bar.baz = { _type = "option"; value = "option value of bar.baz"; ... };
|
||
...
|
||
};
|
||
# A list of definitions that weren't matched by any option
|
||
unmatchedDefns = [
|
||
{ file = "file.nix"; prefix = [ "qux" ]; value = "qux"; }
|
||
...
|
||
];
|
||
}
|
||
*/
|
||
mergeModules = prefix: modules:
|
||
mergeModules' prefix modules
|
||
(concatMap (m: map (config: { file = m._file; inherit config; }) (pushDownProperties m.config)) modules);
|
||
|
||
mergeModules' = prefix: options: configs:
|
||
let
|
||
/* byName is like foldAttrs, but will look for attributes to merge in the
|
||
specified attribute name.
|
||
|
||
byName "foo" (module: value: ["module.hidden=${module.hidden},value=${value}"])
|
||
[
|
||
{
|
||
hidden="baz";
|
||
foo={qux="bar"; gla="flop";};
|
||
}
|
||
{
|
||
hidden="fli";
|
||
foo={qux="gne"; gli="flip";};
|
||
}
|
||
]
|
||
===>
|
||
{
|
||
gla = [ "module.hidden=baz,value=flop" ];
|
||
gli = [ "module.hidden=fli,value=flip" ];
|
||
qux = [ "module.hidden=baz,value=bar" "module.hidden=fli,value=gne" ];
|
||
}
|
||
*/
|
||
byName = attr: f: modules:
|
||
foldl' (acc: module:
|
||
if !(builtins.isAttrs module.${attr}) then
|
||
throw ''
|
||
You're trying to declare a value of type `${builtins.typeOf module.${attr}}'
|
||
rather than an attribute-set for the option
|
||
`${builtins.concatStringsSep "." prefix}'!
|
||
|
||
This usually happens if `${builtins.concatStringsSep "." prefix}' has option
|
||
definitions inside that are not matched. Please check how to properly define
|
||
this option by e.g. referring to `man 5 configuration.nix'!
|
||
''
|
||
else
|
||
acc // (mapAttrs (n: v:
|
||
(acc.${n} or []) ++ f module v
|
||
) module.${attr}
|
||
)
|
||
) {} modules;
|
||
# an attrset 'name' => list of submodules that declare ‘name’.
|
||
declsByName = byName "options" (module: option:
|
||
[{ inherit (module) _file; options = option; }]
|
||
) options;
|
||
# an attrset 'name' => list of submodules that define ‘name’.
|
||
defnsByName = byName "config" (module: value:
|
||
map (config: { inherit (module) file; inherit config; }) (pushDownProperties value)
|
||
) configs;
|
||
# extract the definitions for each loc
|
||
defnsByName' = byName "config" (module: value:
|
||
[{ inherit (module) file; inherit value; }]
|
||
) configs;
|
||
|
||
resultsByName = flip mapAttrs declsByName (name: decls:
|
||
# We're descending into attribute ‘name’.
|
||
let
|
||
loc = prefix ++ [name];
|
||
defns = defnsByName.${name} or [];
|
||
defns' = defnsByName'.${name} or [];
|
||
nrOptions = count (m: isOption m.options) decls;
|
||
in
|
||
if nrOptions == length decls then
|
||
let opt = fixupOptionType loc (mergeOptionDecls loc decls);
|
||
in {
|
||
matchedOptions = evalOptionValue loc opt defns';
|
||
unmatchedDefns = [];
|
||
}
|
||
else if nrOptions != 0 then
|
||
let
|
||
firstOption = findFirst (m: isOption m.options) "" decls;
|
||
firstNonOption = findFirst (m: !isOption m.options) "" decls;
|
||
in
|
||
throw "The option `${showOption loc}' in `${firstOption._file}' is a prefix of options in `${firstNonOption._file}'."
|
||
else
|
||
mergeModules' loc decls defns);
|
||
|
||
matchedOptions = mapAttrs (n: v: v.matchedOptions) resultsByName;
|
||
|
||
# an attrset 'name' => list of unmatched definitions for 'name'
|
||
unmatchedDefnsByName =
|
||
# Propagate all unmatched definitions from nested option sets
|
||
mapAttrs (n: v: v.unmatchedDefns) resultsByName
|
||
# Plus the definitions for the current prefix that don't have a matching option
|
||
// removeAttrs defnsByName' (attrNames matchedOptions);
|
||
in {
|
||
inherit matchedOptions;
|
||
|
||
# Transforms unmatchedDefnsByName into a list of definitions
|
||
unmatchedDefns = concatLists (mapAttrsToList (name: defs:
|
||
map (def: def // {
|
||
# Set this so we know when the definition first left unmatched territory
|
||
prefix = [name] ++ (def.prefix or []);
|
||
}) defs
|
||
) unmatchedDefnsByName);
|
||
};
|
||
|
||
/* Merge multiple option declarations into a single declaration. In
|
||
general, there should be only one declaration of each option.
|
||
The exception is the ‘options’ attribute, which specifies
|
||
sub-options. These can be specified multiple times to allow one
|
||
module to add sub-options to an option declared somewhere else
|
||
(e.g. multiple modules define sub-options for ‘fileSystems’).
|
||
|
||
'loc' is the list of attribute names where the option is located.
|
||
|
||
'opts' is a list of modules. Each module has an options attribute which
|
||
correspond to the definition of 'loc' in 'opt.file'. */
|
||
mergeOptionDecls =
|
||
let
|
||
packSubmodule = file: m:
|
||
{ _file = file; imports = [ m ]; };
|
||
coerceOption = file: opt:
|
||
if isFunction opt then packSubmodule file opt
|
||
else packSubmodule file { options = opt; };
|
||
in loc: opts:
|
||
foldl' (res: opt:
|
||
let t = res.type;
|
||
t' = opt.options.type;
|
||
mergedType = t.typeMerge t'.functor;
|
||
typesMergeable = mergedType != null;
|
||
typeSet = if (bothHave "type") && typesMergeable
|
||
then { type = mergedType; }
|
||
else {};
|
||
bothHave = k: opt.options ? ${k} && res ? ${k};
|
||
in
|
||
if bothHave "default" ||
|
||
bothHave "example" ||
|
||
bothHave "description" ||
|
||
bothHave "apply" ||
|
||
(bothHave "type" && (! typesMergeable))
|
||
then
|
||
throw "The option `${showOption loc}' in `${opt._file}' is already declared in ${showFiles res.declarations}."
|
||
else
|
||
let
|
||
/* Add the modules of the current option to the list of modules
|
||
already collected. The options attribute except either a list of
|
||
submodules or a submodule. For each submodule, we add the file of the
|
||
current option declaration as the file use for the submodule. If the
|
||
submodule defines any filename, then we ignore the enclosing option file. */
|
||
options' = toList opt.options.options;
|
||
|
||
getSubModules = opt.options.type.getSubModules or null;
|
||
submodules =
|
||
if getSubModules != null then map (packSubmodule opt._file) getSubModules ++ res.options
|
||
else if opt.options ? options then map (coerceOption opt._file) options' ++ res.options
|
||
else res.options;
|
||
in opt.options // res //
|
||
{ declarations = res.declarations ++ [opt._file];
|
||
options = submodules;
|
||
} // typeSet
|
||
) { inherit loc; declarations = []; options = []; } opts;
|
||
|
||
/* Merge all the definitions of an option to produce the final
|
||
config value. */
|
||
evalOptionValue = loc: opt: defs:
|
||
let
|
||
# Add in the default value for this option, if any.
|
||
defs' =
|
||
(optional (opt ? default)
|
||
{ file = head opt.declarations; value = mkOptionDefault opt.default; }) ++ defs;
|
||
|
||
# Handle properties, check types, and merge everything together.
|
||
res =
|
||
if opt.readOnly or false && length defs' > 1 then
|
||
let
|
||
# For a better error message, evaluate all readOnly definitions as
|
||
# if they were the only definition.
|
||
separateDefs = map (def: def // {
|
||
value = (mergeDefinitions loc opt.type [ def ]).mergedValue;
|
||
}) defs';
|
||
in throw "The option `${showOption loc}' is read-only, but it's set multiple times. Definition values:${showDefs separateDefs}"
|
||
else
|
||
mergeDefinitions loc opt.type defs';
|
||
|
||
# Apply the 'apply' function to the merged value. This allows options to
|
||
# yield a value computed from the definitions
|
||
value = if opt ? apply then opt.apply res.mergedValue else res.mergedValue;
|
||
|
||
warnDeprecation =
|
||
warnIf (opt.type.deprecationMessage != null)
|
||
"The type `types.${opt.type.name}' of option `${showOption loc}' defined in ${showFiles opt.declarations} is deprecated. ${opt.type.deprecationMessage}";
|
||
|
||
in warnDeprecation opt //
|
||
{ value = builtins.addErrorContext "while evaluating the option `${showOption loc}':" value;
|
||
inherit (res.defsFinal') highestPrio;
|
||
definitions = map (def: def.value) res.defsFinal;
|
||
files = map (def: def.file) res.defsFinal;
|
||
inherit (res) isDefined;
|
||
};
|
||
|
||
# Merge definitions of a value of a given type.
|
||
mergeDefinitions = loc: type: defs: rec {
|
||
defsFinal' =
|
||
let
|
||
# Process mkMerge and mkIf properties.
|
||
defs' = concatMap (m:
|
||
map (value: { inherit (m) file; inherit value; }) (builtins.addErrorContext "while evaluating definitions from `${m.file}':" (dischargeProperties m.value))
|
||
) defs;
|
||
|
||
# Process mkOverride properties.
|
||
defs'' = filterOverrides' defs';
|
||
|
||
# Sort mkOrder properties.
|
||
defs''' =
|
||
# Avoid sorting if we don't have to.
|
||
if any (def: def.value._type or "" == "order") defs''.values
|
||
then sortProperties defs''.values
|
||
else defs''.values;
|
||
in {
|
||
values = defs''';
|
||
inherit (defs'') highestPrio;
|
||
};
|
||
defsFinal = defsFinal'.values;
|
||
|
||
# Type-check the remaining definitions, and merge them. Or throw if no definitions.
|
||
mergedValue =
|
||
if isDefined then
|
||
if all (def: type.check def.value) defsFinal then type.merge loc defsFinal
|
||
else let allInvalid = filter (def: ! type.check def.value) defsFinal;
|
||
in throw "A definition for option `${showOption loc}' is not of type `${type.description}'. Definition values:${showDefs allInvalid}"
|
||
else
|
||
# (nixos-option detects this specific error message and gives it special
|
||
# handling. If changed here, please change it there too.)
|
||
throw "The option `${showOption loc}' is used but not defined.";
|
||
|
||
isDefined = defsFinal != [];
|
||
|
||
optionalValue =
|
||
if isDefined then { value = mergedValue; }
|
||
else {};
|
||
};
|
||
|
||
/* Given a config set, expand mkMerge properties, and push down the
|
||
other properties into the children. The result is a list of
|
||
config sets that do not have properties at top-level. For
|
||
example,
|
||
|
||
mkMerge [ { boot = set1; } (mkIf cond { boot = set2; services = set3; }) ]
|
||
|
||
is transformed into
|
||
|
||
[ { boot = set1; } { boot = mkIf cond set2; services = mkIf cond set3; } ].
|
||
|
||
This transform is the critical step that allows mkIf conditions
|
||
to refer to the full configuration without creating an infinite
|
||
recursion.
|
||
*/
|
||
pushDownProperties = cfg:
|
||
if cfg._type or "" == "merge" then
|
||
concatMap pushDownProperties cfg.contents
|
||
else if cfg._type or "" == "if" then
|
||
map (mapAttrs (n: v: mkIf cfg.condition v)) (pushDownProperties cfg.content)
|
||
else if cfg._type or "" == "override" then
|
||
map (mapAttrs (n: v: mkOverride cfg.priority v)) (pushDownProperties cfg.content)
|
||
else # FIXME: handle mkOrder?
|
||
[ cfg ];
|
||
|
||
/* Given a config value, expand mkMerge properties, and discharge
|
||
any mkIf conditions. That is, this is the place where mkIf
|
||
conditions are actually evaluated. The result is a list of
|
||
config values. For example, ‘mkIf false x’ yields ‘[]’,
|
||
‘mkIf true x’ yields ‘[x]’, and
|
||
|
||
mkMerge [ 1 (mkIf true 2) (mkIf true (mkIf false 3)) ]
|
||
|
||
yields ‘[ 1 2 ]’.
|
||
*/
|
||
dischargeProperties = def:
|
||
if def._type or "" == "merge" then
|
||
concatMap dischargeProperties def.contents
|
||
else if def._type or "" == "if" then
|
||
if isBool def.condition then
|
||
if def.condition then
|
||
dischargeProperties def.content
|
||
else
|
||
[ ]
|
||
else
|
||
throw "‘mkIf’ called with a non-Boolean condition"
|
||
else
|
||
[ def ];
|
||
|
||
/* Given a list of config values, process the mkOverride properties,
|
||
that is, return the values that have the highest (that is,
|
||
numerically lowest) priority, and strip the mkOverride
|
||
properties. For example,
|
||
|
||
[ { file = "/1"; value = mkOverride 10 "a"; }
|
||
{ file = "/2"; value = mkOverride 20 "b"; }
|
||
{ file = "/3"; value = "z"; }
|
||
{ file = "/4"; value = mkOverride 10 "d"; }
|
||
]
|
||
|
||
yields
|
||
|
||
[ { file = "/1"; value = "a"; }
|
||
{ file = "/4"; value = "d"; }
|
||
]
|
||
|
||
Note that "z" has the default priority 100.
|
||
*/
|
||
filterOverrides = defs: (filterOverrides' defs).values;
|
||
|
||
filterOverrides' = defs:
|
||
let
|
||
getPrio = def: if def.value._type or "" == "override" then def.value.priority else defaultPriority;
|
||
highestPrio = foldl' (prio: def: min (getPrio def) prio) 9999 defs;
|
||
strip = def: if def.value._type or "" == "override" then def // { value = def.value.content; } else def;
|
||
in {
|
||
values = concatMap (def: if getPrio def == highestPrio then [(strip def)] else []) defs;
|
||
inherit highestPrio;
|
||
};
|
||
|
||
/* Sort a list of properties. The sort priority of a property is
|
||
1000 by default, but can be overridden by wrapping the property
|
||
using mkOrder. */
|
||
sortProperties = defs:
|
||
let
|
||
strip = def:
|
||
if def.value._type or "" == "order"
|
||
then def // { value = def.value.content; inherit (def.value) priority; }
|
||
else def;
|
||
defs' = map strip defs;
|
||
compare = a: b: (a.priority or 1000) < (b.priority or 1000);
|
||
in sort compare defs';
|
||
|
||
/* Hack for backward compatibility: convert options of type
|
||
optionSet to options of type submodule. FIXME: remove
|
||
eventually. */
|
||
fixupOptionType = loc: opt:
|
||
let
|
||
options = opt.options or
|
||
(throw "Option `${showOption loc}' has type optionSet but has no option attribute, in ${showFiles opt.declarations}.");
|
||
f = tp:
|
||
let optionSetIn = type: (tp.name == type) && (tp.functor.wrapped.name == "optionSet");
|
||
in
|
||
if tp.name == "option set" || tp.name == "submodule" then
|
||
throw "The option ${showOption loc} uses submodules without a wrapping type, in ${showFiles opt.declarations}."
|
||
else if optionSetIn "attrsOf" then types.attrsOf (types.submodule options)
|
||
else if optionSetIn "listOf" then types.listOf (types.submodule options)
|
||
else if optionSetIn "nullOr" then types.nullOr (types.submodule options)
|
||
else tp;
|
||
in
|
||
if opt.type.getSubModules or null == null
|
||
then opt // { type = f (opt.type or types.unspecified); }
|
||
else opt // { type = opt.type.substSubModules opt.options; options = []; };
|
||
|
||
|
||
/* Properties. */
|
||
|
||
mkIf = condition: content:
|
||
{ _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’
|
||
|
||
mkOrder = priority: content:
|
||
{ _type = "order";
|
||
inherit priority content;
|
||
};
|
||
|
||
mkBefore = mkOrder 500;
|
||
mkAfter = mkOrder 1500;
|
||
|
||
# The default priority for things that don't have a priority specified.
|
||
defaultPriority = 100;
|
||
|
||
# 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:
|
||
mkAliasIfDef option (wrap (mkMerge option.definitions));
|
||
|
||
# Similar to mkAliasAndWrapDefinitions but copies over the priority from the
|
||
# option as well.
|
||
#
|
||
# If a priority is not set, it assumes a priority of defaultPriority.
|
||
mkAliasAndWrapDefsWithPriority = wrap: option:
|
||
let
|
||
prio = option.highestPrio or defaultPriority;
|
||
defsWithPrio = map (mkOverride prio) option.definitions;
|
||
in mkAliasIfDef option (wrap (mkMerge defsWithPrio));
|
||
|
||
mkAliasIfDef = option:
|
||
mkIf (isOption option && option.isDefined);
|
||
|
||
/* 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 assertion 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;
|
||
apply = x: throw "The option `${showOption optionName}' can no longer be used since it's been removed. ${replacementInstructions}";
|
||
});
|
||
config.assertions =
|
||
let opt = getAttrFromPath optionName options; in [{
|
||
assertion = !opt.isDefined;
|
||
message = ''
|
||
The option definition `${showOption optionName}' in ${showFiles opt.files} no longer has any effect; please remove it.
|
||
${replacementInstructions}
|
||
'';
|
||
}];
|
||
};
|
||
|
||
/* Return a module that causes a warning to be shown if the
|
||
specified "from" option is defined; the defined value is however
|
||
forwarded to the "to" option. This can be used to rename options
|
||
while providing backward compatibility. For example,
|
||
|
||
mkRenamedOptionModule [ "boot" "copyKernels" ] [ "boot" "loader" "grub" "copyKernels" ]
|
||
|
||
forwards any definitions of boot.copyKernels to
|
||
boot.loader.grub.copyKernels while printing a warning.
|
||
|
||
This also copies over the priority from the aliased option to the
|
||
non-aliased option.
|
||
*/
|
||
mkRenamedOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = false;
|
||
warn = true;
|
||
use = builtins.trace "Obsolete option `${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 `${showOption to}' documentation and update your configuration accordingly."
|
||
) from);
|
||
} // setAttrByPath to (mkMerge
|
||
(optional
|
||
(any (f: (getAttrFromPath f config) != "_mkMergedOptionModule") from)
|
||
(mergeFn config)));
|
||
};
|
||
|
||
/* Single "from" version of mkMergedOptionModule.
|
||
Return a module that causes a warning to be shown if the "from" option is
|
||
defined; the defined value can be used in the "mergeFn" to set the "to"
|
||
value.
|
||
This function can be used to change an option into another that has a
|
||
different type.
|
||
|
||
"mergeFn" takes the module "config" as a parameter and must return a value of
|
||
"to" option type.
|
||
|
||
mkChangedOptionModule [ "a" "b" "c" ] [ "x" "y" "z" ]
|
||
(config:
|
||
let value = getAttrFromPath [ "a" "b" "c" ] config;
|
||
in
|
||
if value > 100 then "high"
|
||
else "normal")
|
||
|
||
- options.a.b.c is a removed int option
|
||
- options.x.y.z is a new str option that supersedes a.b.c
|
||
|
||
This show a warning if a.b.c is set, and set the value of x.y.z to the
|
||
result of the change function
|
||
*/
|
||
mkChangedOptionModule = from: to: changeFn:
|
||
mkMergedOptionModule [ from ] to changeFn;
|
||
|
||
/* Like ‘mkRenamedOptionModule’, but doesn't show a warning. */
|
||
mkAliasOptionModule = from: to: doRename {
|
||
inherit from to;
|
||
visible = true;
|
||
warn = false;
|
||
use = id;
|
||
};
|
||
|
||
doRename = { from, to, visible, warn, use, withPriority ? true }:
|
||
{ config, options, ... }:
|
||
let
|
||
fromOpt = getAttrFromPath from options;
|
||
toOf = attrByPath to
|
||
(abort "Renaming error: option `${showOption to}' does not exist.");
|
||
toType = let opt = attrByPath to {} options; in opt.type or (types.submodule {});
|
||
in
|
||
{
|
||
options = setAttrByPath from (mkOption {
|
||
inherit visible;
|
||
description = "Alias of <option>${showOption to}</option>.";
|
||
apply = x: use (toOf config);
|
||
} // optionalAttrs (toType != null) {
|
||
type = toType;
|
||
});
|
||
config = mkMerge [
|
||
{
|
||
warnings = optional (warn && fromOpt.isDefined)
|
||
"The option `${showOption from}' defined in ${showFiles fromOpt.files} has been renamed to `${showOption to}'.";
|
||
}
|
||
(if withPriority
|
||
then mkAliasAndWrapDefsWithPriority (setAttrByPath to) fromOpt
|
||
else mkAliasAndWrapDefinitions (setAttrByPath to) fromOpt)
|
||
];
|
||
};
|
||
|
||
/* Use this function to import a JSON file as NixOS configuration.
|
||
|
||
importJSON -> path -> attrs
|
||
*/
|
||
importJSON = file: {
|
||
_file = file;
|
||
config = lib.importJSON file;
|
||
};
|
||
|
||
/* Use this function to import a TOML file as NixOS configuration.
|
||
|
||
importTOML -> path -> attrs
|
||
*/
|
||
importTOML = file: {
|
||
_file = file;
|
||
config = lib.importTOML file;
|
||
};
|
||
}
|