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lib/modules: Add a function to create an option alias that respects the priority

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This commit adds a function `mkAliasOptionModuleWithPriority`.  This
function will make an alias to an existing option and copy over the
priority.

This functionality is needed for PRs like #53041.  In that case
`nixos-generate-config` added an option to `hardware-configuration.nix`
with `mkDefault`.  That option was then changed and an alias created for
the old name.

The end user should be able to set the non-alias option in their
`configuration.nix` and have everything work correctly.  Without this
function, the priority for the option won't be copied over correctly
and the end-user will get a message saying they have the same option
set to two different values.
This commit is contained in:
(cdep)illabout
2019-01-04 18:35:10 +09:00
parent da00ec4b45
commit b81b3ad1b0
3 changed files with 29 additions and 5 deletions
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lib/default.nix
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@@ -109,7 +109,7 @@ let
mkFixStrictness mkOrder mkBefore mkAfter mkAliasDefinitions
mkAliasAndWrapDefinitions fixMergeModules mkRemovedOptionModule
mkRenamedOptionModule mkMergedOptionModule mkChangedOptionModule
mkAliasOptionModule doRename filterModules;
mkAliasOptionModule mkAliasOptionModuleWithPriority doRename filterModules;
inherit (options) isOption mkEnableOption mkSinkUndeclaredOptions
mergeDefaultOption mergeOneOption mergeEqualOption getValues
getFiles optionAttrSetToDocList optionAttrSetToDocList'