Consider fowarding inputs as extraSpecialArgs to home-manger modules by default home-manager.extraSpecialArgs.inputs = inputs;

[multivac61]

Is your feature request related to a problem? Please describe.

Spent half a day figuring out what this error message meant:

error:
       … while calling the 'head' builtin
         at /nix/store/s4s1whqp76y6jsaam6fw635gxdgi9gwc-source/lib/attrsets.nix:1575:11:
         1574|         || pred here (elemAt values 1) (head values) then
         1575|           head values
             |           ^
         1576|         else

       … while evaluating the attribute 'value'
         at /nix/store/s4s1whqp76y6jsaam6fw635gxdgi9gwc-source/lib/modules.nix:816:9:
          815|     in warnDeprecation opt //
          816|       { value = addErrorContext "while evaluating the option `${showOption loc}':" value;
             |         ^
          817|         inherit (res.defsFinal') highestPrio;

       … while evaluating the option `system.build.toplevel':

       … while evaluating definitions from `/nix/store/s4s1whqp76y6jsaam6fw635gxdgi9gwc-source/nixos/modules/system/activation/top-level.nix':

       … while evaluating the option `assertions':

       … while evaluating definitions from `/nix/store/vkv5170r6ajjgzffm9fly83mc4wc93by-source/nixos/common.nix':

       … while evaluating the module argument `inputs' in "/nix/store/72ld50ay4r2ngk2998sir8wgkgc48j1j-source/modules/home/myhome":

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: infinite recursion encountered
       at /nix/store/s4s1whqp76y6jsaam6fw635gxdgi9gwc-source/lib/modules.nix:515:28:
          514|         addErrorContext (context name)
          515|           (args.${name} or config._module.args.${name})
             |                            ^
          516|       ) (functionArgs f);

Turned out that my modules/home/myhome/default.nix was referencing inputs which hadn't been forwarded with extraSpedcialArgs

Describe the solution you'd like

inputs.self.homeModules.<...> to have access to inputs like other modules.