services.hydra-dev.package = hydra.packages.x86_64-linux.hydra;

error:
       … while evaluating attribute 'rhea'

       … while evaluating 'v' to select 'drvPath' on it
         at /nix/store/3kbrnq761r2bgyr4nr0jwk5imnzzdkzw-source/eval.nix:191:60:
          190|   evalSelected =             names: lib.filterAttrs (name: _: elem name names) toplevel;
          191|   evalSelectedDrvPaths =     names: lib.mapAttrs    (_: v: v.drvPath)          (evalSelected names);
             |                                                            ^
          192|   metaConfig = lib.filterAttrs (n: v: elem n metaConfigKeys) hive.meta;

       … while calling the 'head' builtin
         at /nix/store/r7vyiqj0zfk86lgkqcgn35lyv5xp92m6-source/lib/attrsets.nix:1575:11:
         1574|         || pred here (elemAt values 1) (head values) then
         1575|           head values
             |           ^
         1576|         else

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

       error: attribute 'hydra' missing
       at /nix/store/r7vyiqj0zfk86lgkqcgn35lyv5xp92m6-source/lib/modules.nix:508:28:
          507|         builtins.addErrorContext (context name)
          508|           (args.${name} or config._module.args.${name})
             |                            ^
          509|       ) (lib.functionArgs f);
Evaluation failed: Child process exited with error code: 1

nix-repl> inputs.hydra.packages.x86_64-linux.hydra
«derivation /nix/store/qisipbd2ajh4x11sri4dffwq1n5mxizw-hydra-0.1.20241008.c69e301.drv»

Hydra 0.1.20241008.c69e301 (using nix-2.24.8).

In reply to @hexa:lossy.network
which gets resolved to the version from nixpkgs

In reply to @hexa:lossy.network
John Ericson: and I've moved us back to hydra master now that we don't have anyone maintaining the h.n.o changes any longer