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lib: fix and simplify doRename

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Before this change `mkRenamedOptionModule` would override option defaults
even when the old option name is left unused. For instance

```nix
{
  optios = {
    services.name.new = mkOption {
      default = { one = {}; };
    };
  };
  imports = [
    (mkRenamedOptionModule [ "services" "name" "old" ] [ "services" "name" "new" "two" ])
  ];
  config = {};
}
```

would evaluate to

`{ config.services.name.new = { two = {}; }; }`

when you'd expect it to evaluate to

`{ config.services.name.new = { one = {}; }; }`.
This commit is contained in:
Jan Malakhovski 2018-04-28 20:16:37 +00:00
parent c0c43e9c07
commit 449d43fe01
1 changed files with 17 additions and 13 deletions
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30
lib/modules.nix
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@ -667,22 +667,26 @@ rec {
};
doRename = { from, to, visible, warn, use }:
{ config, options, ... }:
let
fromOpt = getAttrFromPath from options;
toOpt = getAttrFromPath to options;
toOf = attrByPath to
(abort "Renaming error: option `${showOption to}' does not exist.");
in
{ config, options, ... }:
{ options = setAttrByPath from (mkOption {
inherit visible;
description = "Alias of <option>${showOption to}</option>.";
apply = x: use (toOf config);
});
config = {
warnings =
let opt = getAttrFromPath from options; in
optional (warn && opt.isDefined)
"The option `${showOption from}' defined in ${showFiles opt.files} has been renamed to `${showOption to}'.";
} // setAttrByPath to (mkAliasDefinitions (getAttrFromPath from options));
};
{
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)
];
};
}