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nixos/nixos-option: Show values inside aggregate options uniformly
1. This makes aggregates of submodules (including the very important "nixos-option users.users.<username>" case) behave the same way as any other you-need-to-keep-typing-to-get-to-an-option-leaf (eg: "nixos-option environment"). Before e0780c5: $ nixos-option users.users.root error: At 'root' in path 'users.users.root': Attribute not found An error occurred while looking for attribute names. Are you sure that 'users.users.root' exists? After e0780c5 but before this change, this query just printed out a raw thing, which is behavior that belongs in "nix eval", "nix-instantiate --eval", or "nix repl <<<": $ nixos-option users.users.root { _module = { args = { name = "root"; }; check = true; }; createHome = false; cryptHomeLuks = null; description = "System administrator"; ... After this change: $ nixos-option users.users.root This attribute set contains: createHome cryptHomeLuks description extraGroups group hashedPassword ... 2. For aggregates of other types (not submodules), print out the option that contains them rather than printing an error message. Before: $ nixos-option environment.shellAliases.l error: At 'l' in path 'environment.shellAliases.l': Attribute not found An error occurred while looking for attribute names. Are you sure that 'environment.shellAliases.l' exists? After: $ nixos-option environment.shellAliases.l Note: showing environment.shellAliases instead of environment.shellAliases.l Value: { l = "ls -alh"; ll = "ls -l"; ls = "ls --color=tty"; } ...
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