chore(nix): remove legacy non-flake configuration

default.nix

@@ -1,23 +0,0 @@
-{
-  sources ? import ./nix/sources.nix,
-  system ? builtins.currentSystem,
-  crossSystem ? null,
-  config ? {},
-  alejandraUnstable ? (import sources.nixpkgsUnstable {}).alejandra,
-  cardanoNodeProject ? import sources.cardano-node {},
-} @ args:
-with import ./nix args; {
-  shell = mkShell {
-    inherit (import sources.niv {}) niv;
-    buildInputs = [
-      alejandraUnstable # The Uncompromising Nix Code Formatter
-      cardanoNodeProject.cardano-cli # required for KES key rotation
-      niv
-      nixops_unstable_minimal # work around for issue #127423
-      tea # Gitea official CLI client
-      treefmt # one CLI to format the code tree
-    ];
-    NIX_PATH = "nixpkgs=${sources.nixpkgs}";
-    NIXOPS_DEPLOYMENT = "${globals.deploymentName}";
-  };
-}

globals-defaults.nix

@@ -1 +0,0 @@
-{}

globals.nix

@@ -1,11 +0,0 @@
-self: super: {
-  globals =
-    import ./globals-defaults.nix
-    // rec {
-      deploymentName = "mio-ops";
-
-      domain = "mcwhirter.io";
-
-      environment = "${deploymentName}";
-    };
-}

outputs.nix

@@ -8,13 +8,16 @@
   ...
 } @ inputs:
 (utils.lib.eachDefaultSystem (system: let
+  deploymentName = "mio-ops";
   pkgs = nixpkgs.legacyPackages."${system}";
+  nix_path = "nixpkgs=${nixpkgs}";
 in {
   devShell =
     pkgs.callPackage
     ./shell.nix {
       inherit (nix.packages."${pkgs.system}") nix;
-      inherit (nixpkgsUnstable.legacyPackages."${pkgs.system}") alejandra;
+      inherit deploymentName;
+      inherit nix_path;
     };
   nixopsConfigurations."${pkgs.system}".default = {
     inherit (inputs) nixpkgs;
@@ -23,6 +26,7 @@ in {
       enableRollback = true;
       storage.legacy = {databasefile = "~/.nixops/deployments.nixops";};
     };
+    defaults = {};
     airgead = import hosts/airgead.nix;
     brighde = import hosts/brighde.nix;
     ceilidh = import hosts/ceilidh.nix;

shell.nix

@@ -1,8 +1,9 @@
 {
   pkgs ? import <nixpkgs> {},
+  deploymentName,
   mkShell,
-  alejandra,
   nix,
+  nix_path,
 }:
 with pkgs;
   mkShell {
@@ -13,4 +14,8 @@ with pkgs;
       tea # Gitea official CLI client
       treefmt # one CLI to format the code tree
     ];
+    shellHook = ''
+      export NIX_PATH=${nix_path}
+      export NIXOPS_DEPLOYMENT=${deploymentName}
+    '';
   }