Core data model for a RAM disk volume with backward-compatible decoding via decodeIfPresent, so old persisted configurations survive schema evolution. It also enforces a strict allowlist for volume names to prevent shell injection when those names are used in privileged command strings. This is a clean example of version-tolerant serialization combined with security-conscious input validation, and it can be extracted as a model pattern for any macOS utility that persists user-defined disk/volume metadata.

Shared module that generates and executes macOS disk commands for RAM disk creation, tmpfs mounts, ejection, indexing, and rsync-based folder synchronization. It centralizes the fragile command-line surface of the app and keeps command construction in one auditable place. The rsync sync-on-eject logic and parameterized diskutil/hdiutil command generation are reusable patterns for any macOS tool that needs to drive shell-level disk operations with careful escaping and error handling.

XPC server for a privileged helper tool that validates incoming connections using audit-token-based client checking before performing privileged disk operations. This demonstrates the correct macOS pattern for separating privileged work from an unprivileged UI app: a launchd-installed helper, a defined XPC protocol, and caller validation. It can be reused as a reference implementation for other macOS apps that need to perform privileged operations without prompting for a password on every call.

A lightweight argument parser for the command-line interface, handling subcommands such as create, eject, save, list, and help. It is self-contained and not coupled to the AppKit UI, making it a reusable pattern for Swift command-line tools that need deterministic, testable argument parsing without pulling in a heavyweight dependency.