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lib/modules: Scope module evaluation variables more tightly 

This is a purely cosmetic change so it's easier to see dependencies
between variables.
This commit is contained in:
Silvan Mosberger 2020-03-19 23:45:23 +01:00
parent b3f869febb
commit b02a3d7b08
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1 changed files with 29 additions and 26 deletions
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55
lib/modules.nix
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@ -65,34 +65,37 @@ rec {
}; };
}; };
collected = collectModules options =
(specialArgs.modulesPath or "") let collected = collectModules
(modules ++ [ internalModule ]) (specialArgs.modulesPath or "")
({ inherit config options lib; } // specialArgs); (modules ++ [ internalModule ])
({ inherit lib options config; } // specialArgs);
in mergeModules prefix (reverseList collected);
options = mergeModules prefix (reverseList collected); config =
let
# Traverse options and extract the option values into the final
# config set. At the same time, check whether all option
# definitions have matching declarations.
# !!! _module.check's value can't depend on any other config values
# without an infinite recursion. One way around this is to make the
# 'config' passed around to the modules be unconditionally unchecked,
# and only do the check in 'result'.
yieldConfig = prefix: set:
let res = removeAttrs (mapAttrs (n: v:
if isOption v then v.value
else yieldConfig (prefix ++ [n]) v) set) ["_definedNames"];
in
if options._module.check.value && set ? _definedNames then
foldl' (res: m:
foldl' (res: name:
if set ? ${name} then res else throw "The option `${showOption (prefix ++ [name])}' defined in `${m.file}' does not exist.")
res m.names)
res set._definedNames
else
res;
in yieldConfig prefix options;
# Traverse options and extract the option values into the final
# config set. At the same time, check whether all option
# definitions have matching declarations.
# !!! _module.check's value can't depend on any other config values
# without an infinite recursion. One way around this is to make the
# 'config' passed around to the modules be unconditionally unchecked,
# and only do the check in 'result'.
config = yieldConfig prefix options;
yieldConfig = prefix: set:
let res = removeAttrs (mapAttrs (n: v:
if isOption v then v.value
else yieldConfig (prefix ++ [n]) v) set) ["_definedNames"];
in
if options._module.check.value && set ? _definedNames then
foldl' (res: m:
foldl' (res: name:
if set ? ${name} then res else throw "The option `${showOption (prefix ++ [name])}' defined in `${m.file}' does not exist.")
res m.names)
res set._definedNames
else
res;
result = { result = {
inherit options; inherit options;
config = removeAttrs config [ "_module" ]; config = removeAttrs config [ "_module" ];