nixos-install: move to pkgs/by-name

nixos/modules/installer/tools/tools.nix

@@ -19,19 +19,7 @@ let
 
   inherit (pkgs) nixos-build-vms;
 
-  nixos-install = makeProg {
-    name = "nixos-install";
-    src = ./nixos-install.sh;
-    inherit (pkgs) runtimeShell;
-    nix = config.nix.package.out;
-    path = makeBinPath [
-      pkgs.jq
-      nixos-enter
-      pkgs.util-linuxMinimal
-    ];
-    manPage = ./manpages/nixos-install.8;
-  };
-
+  nixos-install = pkgs.nixos-install.override { nix = config.nix.package; };
   nixos-rebuild = pkgs.nixos-rebuild.override { nix = config.nix.package.out; };
 
   nixos-generate-config = makeProg {

pkgs/by-name/ni/nixos-install/package.nix

@@ -0,0 +1,33 @@
+{
+  lib,
+  substituteAll,
+  runtimeShell,
+  installShellFiles,
+  nix,
+  jq,
+  nixos-enter,
+  util-linuxMinimal,
+}:
+substituteAll {
+  name = "nixos-install";
+  src = ./nixos-install.sh;
+
+  inherit runtimeShell nix;
+
+  path = lib.makeBinPath [
+    jq
+    nixos-enter
+    util-linuxMinimal
+  ];
+
+  dir = "bin";
+  isExecutable = true;
+
+  nativeBuildInputs = [ installShellFiles ];
+
+  postInstall = ''
+    installManPage ${./nixos-install.8}
+  '';
+
+  meta.mainProgram = "nixos-install";
+}