Improve update and migration flow

bin/omarchy-migrate-system

@@ -0,0 +1,74 @@
+#!/bin/bash
+
+# omarchy:summary=Run pending Omarchy system migrations as root.
+# omarchy:args=[--pending]
+# omarchy:requires-sudo=true
+
+set -euo pipefail
+
+mode="run"
+while (($#)); do
+  case "$1" in
+    --pending|--check)
+      mode="pending"
+      shift
+      ;;
+    -h|--help)
+      echo "Usage: omarchy-migrate-system [--pending]"
+      exit 0
+      ;;
+    *)
+      echo "Unknown option: $1" >&2
+      exit 1
+      ;;
+  esac
+done
+
+OMARCHY_PATH="${OMARCHY_PATH:-/usr/share/omarchy}"
+STATE_DIR="${OMARCHY_SYSTEM_MIGRATION_STATE:-/var/lib/omarchy/migrations/system}"
+MIGRATIONS_DIR="$OMARCHY_PATH/migrations/system"
+
+pending_migrations() {
+  [[ -d $MIGRATIONS_DIR ]] || return 0
+
+  for file in "$MIGRATIONS_DIR"/*.sh; do
+    [[ -f $file ]] || continue
+    filename=$(basename "$file")
+
+    if [[ ! -f $STATE_DIR/$filename ]]; then
+      printf '%s\n' "$filename"
+    fi
+  done
+}
+
+if [[ $mode == "pending" ]]; then
+  pending_output=$(pending_migrations)
+  if [[ -n $pending_output ]]; then
+    printf '%s\n' "$pending_output"
+    exit 0
+  else
+    exit 1
+  fi
+fi
+
+if (( EUID != 0 )) && [[ -z ${OMARCHY_SYSTEM_MIGRATION_STATE:-} ]]; then
+  if ! "$0" --pending >/dev/null; then
+    exit 0
+  fi
+
+  exec sudo --preserve-env=OMARCHY_PATH "$0" "$@"
+fi
+
+mkdir -p "$STATE_DIR"
+[[ -d $MIGRATIONS_DIR ]] || exit 0
+
+for file in "$MIGRATIONS_DIR"/*.sh; do
+  [[ -f $file ]] || continue
+  filename=$(basename "$file")
+
+  if [[ ! -f $STATE_DIR/$filename ]]; then
+    echo -e "\e[32m\nRunning system migration (${filename%.sh})\e[0m"
+    OMARCHY_PATH="$OMARCHY_PATH" bash -euo pipefail "$file"
+    touch "$STATE_DIR/$filename"
+  fi
+done