lib.pushDownProperties

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.

Inputs

cfg

1. Function argument

Noogle detected

• lib.modules.pushDownProperties

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 ];