Implement data directory configuration and ensure its existence in the main application. Update README with comprehensive features, installation instructions, and usage guidelines for the Adastra Storage Appliance.

packaging/DEBIAN/postinst

@@ -0,0 +1,47 @@
+#!/bin/bash
+set -e
+
+# Post-installation script for adastra-storage
+
+INSTALL_DIR="/opt/adastra-storage"
+SERVICE_USER="adastra"
+SERVICE_GROUP="adastra"
+
+echo "Adastra Storage: Post-installation setup..."
+
+# Create service user if it doesn't exist
+if ! id "$SERVICE_USER" &>/dev/null; then
+    echo "Creating service user: $SERVICE_USER"
+    useradd -r -s /bin/false -d "$INSTALL_DIR" "$SERVICE_USER" || true
+fi
+
+# Set ownership
+chown -R "$SERVICE_USER:$SERVICE_GROUP" "$INSTALL_DIR" || true
+
+# Create data directory
+mkdir -p "$INSTALL_DIR/data"
+chown "$SERVICE_USER:$SERVICE_GROUP" "$INSTALL_DIR/data"
+
+# Enable and start systemd service
+if systemctl is-enabled adastra-storage.service >/dev/null 2>&1; then
+    echo "Service already enabled"
+else
+    systemctl daemon-reload
+    systemctl enable adastra-storage.service
+    echo "Service enabled. Start with: systemctl start adastra-storage"
+fi
+
+# Set permissions for ZFS commands (if needed)
+# Note: Service user may need sudo access or be in appropriate groups
+usermod -aG disk "$SERVICE_USER" || true
+
+echo "Adastra Storage installation complete!"
+echo "Default admin credentials: username=admin, password=admin"
+echo "Please change the default password after first login!"
+echo ""
+echo "Start the service: systemctl start adastra-storage"
+echo "Check status: systemctl status adastra-storage"
+echo "View logs: journalctl -u adastra-storage -f"
+
+exit 0
+