Automatically create a setup user

lib/modules/valhalla.nix

@@ -12,6 +12,20 @@
 
     options = {
       valhalla = {
+        setupUser = {
+          name = mkOption {
+            type = types.str;
+            description = "The name of the user used to set up the system.";
+            default = "heimdall";
+          };
+
+          id = mkOption {
+            type = types.int;
+            description = "The UID of the user used to set up the system.";
+            default = 420;
+          };
+        };
+
         timeZone = mkOption {
           type = types.nullOr types.str;
           description = "The time zone of the system.";

scripts/Arch/OS/setup.fish

@@ -1,14 +1,15 @@
 #!/bin/env fish
 begin
     set -l dir (status dirname)
-    source "$dir/../../Common/Scripts/wait-network.fish"
-    source "$dir/../../Common/Scripts/config.fish"
-    source "$dir/../../Common/Scripts/hooks.fish"
-
     set -q CONFIG_MODULE || set -l CONFIG_MODULE "$dir/config.nix"
+    source "$dir/../../Common/Scripts/config.fish"
 
     set -l mountDir (getConfig valhalla.partition.rootDir)
 
+    function setupOS -V dir -V CONFIG_MODULE -V mountDir
+        source "$dir/../../Common/Scripts/wait-network.fish"
+        source "$dir/../../Common/Scripts/hooks.fish"
+
         set -q USER_NAME || set -l USER_NAME manuel
         set -q USER_DISPLAYNAME
         set -q USER_GROUPS || set -l USER_GROUPS ""
@@ -106,3 +107,18 @@ begin
             end
         end
     end
+
+    function autologin -S
+        set -l file "/etc/systemd/system/getty@tty1.service.d/autologin.conf"
+        arch-chroot "$mountDir" mkdir -p (dirname "$file")
+
+        begin
+            printf %s\n \
+                "[Service]" \
+                "ExecStart=" \
+                "ExecStart=-/sbin/agetty -o '-p -f -- \\u' --noclear --autologin root %I \$TERM"
+        end | arch-chroot "$mountDir" tee "$file" > /dev/null
+    end
+
+    source "$dir/../../Common/OS/setup.fish"
+end

scripts/Common/OS/setup.fish

@@ -0,0 +1,32 @@
+#!/bin/env fish
+begin
+    set -l dir (status dirname)
+    source "$dir/../Scripts/config.fish"
+    source "$dir/../Scripts/hooks.fish"
+    set -l name (getConfig valhalla.setupUser.name)
+    set -l mountDir (getConfig valhalla.partition.rootDir)
+    runHook setupOS || true
+
+    and runHook createUser || \
+        begin
+            chroot "$mountDir" \
+                useradd \
+                    --comment "PortValhalla setup user" \
+                    --system \
+                    --no-user-group \
+                    --groups wheel \
+                    --create-home \
+                    --uid (getConfig valhalla.setupUser.id --json) \
+                    "$name"
+        end
+
+    chroot "$mountDir" usermod -aG wheel "$name"
+
+    begin
+        echo "$name ALL=(ALL:ALL) NOPASSWD: ALL"
+    end | chroot "$mountDir" tee "/etc/sudoers.d/PortValhalla" > /dev/null
+
+    and runHook autologin || true
+    and echo "Setup finished!"
+    and echo "Please reboot your machine"
+end