fix: wire webinstaller to archinstall 4.x config schema

Walking-skeleton install on a real VM surfaced two archinstall 4.x
schema breakages that the wizard hit only at runtime:

- `use_entire_disk` was removed as a `config_type`. Now builds a full
  `default_layout` disk_config by calling `suggest_single_disk_layout`
  (forced ext4 + no separate /home, which bypasses its interactive
  prompts) and serializing the returned DeviceModification.
- Credentials keys renamed to plaintext sentinels: `!root-password`
  and `!password`. Users with neither `!password` nor `enc_password`
  are silently dropped by `User.parse_arguments` — which is why the
  first real install booted but wouldn't log in.

Also rolls in Robert's UX feedback quick-wins: `(Recommended)` prefix
on the default boot entry across GRUB/syslinux/systemd-boot, and
less-jargon hints on the step-1 hostname/username fields. iso/README
loses three stale bullets that described pre-15b876c behaviour.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

iso/README.md

@@ -49,8 +49,5 @@ mDNS (`proksi.local`) via avahi is installed but not yet wired. First milestone
 ## Known rough edges
 
 - **Disk space**: the first time you build on a fresh host, the squashfs/xorriso steps need ~15 GB free. If the host's LVM-root is smaller, `xorriso` silently dies at the very end with "Image size exceeds free space on media".
-- **Flask `/` route** returns "Hello World" instead of redirecting to `/install/step1`. Harmless but surprising; will be cleaned up when we wire up screens 4–8.
 - **No HTTPS yet**. The Furtka plan is "local CA + green padlock on `https://proksi.local`" — that's a later milestone. For now, plain HTTP.
-- **archinstall is not invoked**. The wizard collects input but doesn't write to disk yet. Still a walking skeleton, not an installer.
 - **Drive list includes `/dev/loop0` and `/dev/sr0`**. `/dev/loop0` is the live ISO's own squashfs mounted in RAM; `/dev/sr0` is the CD-ROM itself. Both appear as install targets, which is wrong. Filter lives in `webinstaller/drives.py` and hasn't been added yet.
-- **GRUB menu still says "Arch Linux install medium"**. We inherit releng's bootloader config. Cosmetic, fix when we care about end-user polish.

iso/build.sh

@@ -55,6 +55,16 @@ find "$PROFILE_WORK/grub" "$PROFILE_WORK/syslinux" "$PROFILE_WORK/efiboot" \
   | xargs -0 sed -i \
     -e 's/Arch Linux install medium/Furtka Live Installer/g'
 
+# Mark the default entry as (Recommended) so first-time users know which to
+# pick. Targets the main entry only — speech/accessibility variants stay
+# unlabeled to avoid suggesting they're the normal choice.
+sed -i 's/^title    Furtka Live Installer (%ARCH%, UEFI)$/title    (Recommended) Furtka Live Installer (%ARCH%, UEFI)/' \
+  "$PROFILE_WORK/efiboot/loader/entries/01-archiso-linux.conf"
+sed -i 's/^MENU LABEL Furtka Live Installer (%ARCH%, BIOS)$/MENU LABEL (Recommended) Furtka Live Installer (%ARCH%, BIOS)/' \
+  "$PROFILE_WORK/syslinux/archiso_sys-linux.cfg"
+sed -i "/--id 'archlinux'/s/menuentry \"Furtka Live Installer/menuentry \"(Recommended) Furtka Live Installer/" \
+  "$PROFILE_WORK/grub/grub.cfg" "$PROFILE_WORK/grub/loopback.cfg"
+
 mkdir -p "$PROFILE_WORK/airootfs/opt/furtka"
 cp -a "$REPO_ROOT/webinstaller/." "$PROFILE_WORK/airootfs/opt/furtka/"
 rm -rf "$PROFILE_WORK/airootfs/opt/furtka/__pycache__"

webinstaller/app.py

@@ -57,24 +57,52 @@ def validate_step1(form):
     return errors, values
 
 
+def build_disk_config(boot_drive):
+    # archinstall 4.x dropped the `use_entire_disk` shortcut — `default_layout`
+    # now requires fully-specified partitions. We call suggest_single_disk_layout
+    # with ext4 + no separate /home, which short-circuits its interactive prompts.
+    import asyncio
+
+    from archinstall.lib.disk.device_handler import device_handler
+    from archinstall.lib.disk.disk_menu import suggest_single_disk_layout
+    from archinstall.lib.models.device import (
+        DiskLayoutConfiguration,
+        DiskLayoutType,
+        FilesystemType,
+    )
+
+    device_handler.load_devices()
+    device = device_handler.get_device(Path(boot_drive))
+    if device is None:
+        raise RuntimeError(f"archinstall could not resolve device {boot_drive!r}")
+
+    device_mod = asyncio.run(
+        suggest_single_disk_layout(
+            device,
+            filesystem_type=FilesystemType.Ext4,
+            separate_home=False,
+        )
+    )
+    layout = DiskLayoutConfiguration(
+        config_type=DiskLayoutType.Default,
+        device_modifications=[device_mod],
+    )
+    return layout.json()
+
+
 def build_archinstall_config(s):
     return {
         "archinstall-language": "English",
         "timezone": "Europe/Berlin",
         "ntp": True,
         "bootloader": "Systemd-boot",
-        "disk_config": {
-            "config_type": "use_entire_disk",
-            "device": s["boot_drive"],
-            "filesystem": "ext4",
-        },
+        "disk_config": build_disk_config(s["boot_drive"]),
         "hostname": s["hostname"],
         "kernels": ["linux"],
         "packages": ["docker", "docker-compose", "vim", "git", "htop", "curl"],
         "profile": {"type": "server"},
         "services": ["docker"],
         "network_config": {"type": "iso"},
-        "users": [{"username": s["username"], "sudo": True, "groups": ["docker"]}],
         "ssh": True,
         "audio_config": None,
         "locale_config": {
@@ -85,9 +113,19 @@ def build_archinstall_config(s):
 
 
 def build_archinstall_creds(s):
+    # archinstall 4.x expects `!root-password` and `!password` (plaintext
+    # sentinels). Users with neither `!password` nor `enc_password` are
+    # silently dropped by User.parse_arguments — hence login failures.
     return {
-        "root_password": s["password"],
-        "users": [{"username": s["username"], "password": s["password"]}],
+        "!root-password": s["password"],
+        "users": [
+            {
+                "username": s["username"],
+                "!password": s["password"],
+                "sudo": True,
+                "groups": ["docker"],
+            }
+        ],
     }
 
 

webinstaller/templates/install/step1.html

@@ -20,12 +20,12 @@
     <div class="field">
         <label for="hostname">Hostname</label>
         <input type="text" id="hostname" name="hostname" required value="{{ values.hostname }}" autocomplete="off" />
-        <span class="hint">Lowercase letters, digits, hyphens. Used on the local network.</span>
+        <span class="hint">The name your server shows up as on your home network. Lowercase letters, numbers, and dashes only.</span>
     </div>
     <div class="field">
         <label for="username">Admin username</label>
         <input type="text" id="username" name="username" required value="{{ values.username }}" autocomplete="username" />
-        <span class="hint">Linux user account with sudo + docker access.</span>
+        <span class="hint">Your login name on the server. You'll use this to sign in after installation.</span>
     </div>
     <div class="field">
         <label for="password">Password</label>