Functioning installation

nixos/installer.nix

@@ -1,6 +1,8 @@
 { lib, pkgs, modulesPath, config, ... }:
 let
-  inherit (lib) mkDefault mkForce;
+  inherit (lib) mkDefault mkForce mkImageMediaOverride;
+
+  installRoot = "/mnt";
 in
 {
   imports = [
@@ -10,18 +12,69 @@ in
     "${modulesPath}/profiles/base.nix"
   ];
 
-  # Some of this is yoinked from modules/profiles/installation-device.nix
   config = {
     my = {
       # Whatever installer mechanism is chosen will provied an appropriate `/`
       tmproot.enable = false;
       firewall.nat.enable = false;
       server.enable = true;
+      deploy.enable = false;
+      user.enable = false;
     };
 
+    environment.sessionVariables = {
+      INSTALL_ROOT = installRoot;
+    };
+    users.users.root.openssh.authorizedKeys.keyFiles = [ lib.my.authorizedKeys ];
+    home-manager.users.root = {
+      programs = {
+        starship.settings = {
+          hostname.ssh_only = false;
+        };
+      };
+
+      home.shellAliases = {
+        show-hw-config = "nixos-generate-config --show-hardware-config --root $INSTALL_ROOT";
+      };
+    };
+
+    services = {
+      openssh = {
+        permitRootLogin = mkImageMediaOverride "prohibit-password";
+      };
+    };
+
+    # Will be set dynamically
+    networking.hostName = "";
+
+    # This should be overridden by whatever boot mechanism is used
+    fileSystems."/" = mkDefault {
+      device = "none";
+      fsType = "tmpfs";
+    };
+
+    systemd.tmpfiles.rules = [
+      "d ${installRoot} 0755 root root"
+    ];
+    boot.postBootCommands =
+      ''
+        ${pkgs.nettools}/bin/hostname "installer-$(${pkgs.coreutils}/bin/head -c4 /dev/urandom | \
+          ${pkgs.coreutils}/bin/od -A none -t x4 | \
+          ${pkgs.gawk}/bin/awk '{ print $1 }')"
+      '';
+
+    environment.systemPackages = with pkgs; [
+      # We disable networking.useDHCP, so bring these in for the user
+      # dhcpcd probably has more features, but dhclient actually seems a bit more simple
+      (pkgs.writeShellScriptBin "dhclient" ''exec ${pkgs.dhcp}/bin/dhclient -v "$@"'')
+      dhcpcd
+    ];
+
+    # Much of this onwards is yoinked from modules/profiles/installation-device.nix
     # Good to have docs in the installer!
-    documentation.enable = mkForce true;
-    documentation.nixos.enable = mkForce true;
+    # TODO: docs rebuilding every time?
+    documentation.enable = mkForce false;
+    documentation.nixos.enable = mkForce false;
 
     # Enable wpa_supplicant, but don't start it by default.
     networking.wireless.enable = mkDefault true;
@@ -39,16 +92,5 @@ in
     # download-using-manifests.pl from forking even if there is
     # plenty of free memory.
     boot.kernel.sysctl."vm.overcommit_memory" = "1";
-
-    # This should be overridden by whatever boot mechanism is used
-    fileSystems."/" = mkDefault {
-      device = "none";
-      fsType = "tmpfs";
-    };
-
-    environment.systemPackages = with pkgs; [
-      # We disable networking.useDHCP, so bring this in for the user
-      dhcpcd
-    ];
   };
 }