diff options
author | Nicolas B. Pierron <nicolas.b.pierron@gmail.com> | 2015-01-01 06:59:42 -0800 |
---|---|---|
committer | Nicolas B. Pierron <nicolas.b.pierron@gmail.com> | 2015-01-01 06:59:42 -0800 |
commit | 816229593a521e420f5ce7b9f7e8f183aabb390c (patch) | |
tree | 92781572fd876556837956d9760e29a69ac2a08e /lib | |
parent | 1d835a2cbdd64e7b257c513904be9d17706c38e9 (diff) | |
parent | d7f29acd48f27f3ad0aa13b47c489f3d4bfda362 (diff) |
Merge pull request #5441 from nbp/mkAlias
modules: Extract mkAliasDefinition from the rename.nix NixOS module.
Diffstat (limited to 'lib')
-rw-r--r-- | lib/modules.nix | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/lib/modules.nix b/lib/modules.nix index fdee8824493dd..d0b8f90e5ce67 100644 --- a/lib/modules.nix +++ b/lib/modules.nix @@ -356,6 +356,31 @@ rec { 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: + mkMerge + (optional (isOption option && option.isDefined) + (wrap (mkMerge option.definitions))); + /* Compatibility. */ fixMergeModules = modules: args: evalModules { inherit modules args; check = false; }; |