Extract cidata loading into a standalone omarchy-cidata-load command

The loader now settles udev before probing, so a fast boot cannot miss
the drive and silently drop a headless install into the wizard. All the
files come over in a single cp, and a failed copy removes anything it
already copied and falls back to the wizard: the wizard cleans up only
what it writes itself, so a half-copied ssh.json would otherwise leak
into the interactive install that follows. The command takes an optional
path prefix so tests can run it against a sandbox instead of the live
system.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

configs/airootfs/usr/local/bin/omarchy-cidata-load

@@ -0,0 +1,57 @@
+#!/bin/bash
+#
+# Autoinstall: a drive labeled cidata (the cloud-init NoCloud label, so Proxmox,
+# libvirt and Packer all know how to attach one) carrying the configurator's own
+# output files stands in for the wizard. Copy those files into /root and
+# everything downstream runs the ordinary path against ordinary inputs.
+#
+# Exits 0 when an autoinstall drive was loaded and the configurator can be
+# skipped. The required pair is the same one the orchestrator treats as
+# mandatory; the rest are optional there too, so don't be stricter here.
+# Anything less than the pair means this isn't an autoinstall drive, and the
+# caller falls back to the wizard.
+#
+# The optional argument prefixes every path the script touches; tests use it to
+# run against a sandbox instead of the live system.
+
+set -uo pipefail
+
+root=${1:-}
+by_label=$root/dev/disk/by-label
+dest=$root/root
+mnt=$root/run/cidata
+
+# The by-label symlinks come from udev, and on a fast boot this can run before
+# device enumeration has finished. Wait for the queue to drain instead of
+# racing it and silently dropping a headless install into the wizard.
+udevadm settle 2>/dev/null || true
+
+device=""
+for label in cidata CIDATA; do
+  [[ -e $by_label/$label ]] && { device=$by_label/$label; break; }
+done
+[[ -n $device ]] || exit 1
+
+mkdir -p "$mnt"
+mount -o ro "$device" "$mnt" || exit 1
+
+loaded=1
+if [[ -f $mnt/user_configuration.json && -f $mnt/user_credentials.json ]]; then
+  files=("$mnt"/user_configuration.json "$mnt"/user_credentials.json)
+  for file in user_full_name.txt user_email_address.txt user_encrypt_installation.txt ssh.json; do
+    [[ -f $mnt/$file ]] && files+=("$mnt/$file")
+  done
+  if cp "${files[@]}" "$dest"/; then
+    loaded=0
+  else
+    # A partial copy must not leave files behind: the wizard cleans up only
+    # what it writes itself, so a half-copied ssh.json would leak into the
+    # interactive install that follows.
+    for file in "${files[@]}"; do
+      rm -f "$dest/${file##*/}"
+    done
+  fi
+fi
+
+umount "$mnt"
+exit $loaded