$ show stefanprodan/timoni
Timoni is a Kubernetes package manager CLI tool powered by the CUE configuration language. It provides a workflow for defining, packaging, and deploying Kubernetes applications as OCI-distributed modules with typed schemas, health checks, and server-side apply. The architecture is a single binary CLI implemented in Go using Cobra for commands, with core logic in internal packages for module building (CUE compilation with overlay injection), OCI artifact management (push/pull/tag/sign), instance reconciliation (dry-run, diff, apply, wait, prune), and bundle composition for multi-instance multi-cluster deployments. The system relies on Flux CD's ssa package for Kubernetes server-side apply and inventory tracking via Secrets, and integrates with Cosign for signing and verification. The codebase is well-structured with a clear separation of concerns across engine, reconciler, runtime, and oci packages, and benefits from extensive integration tests using envtest and an in-memory OCI registry. While tightly coupled to the Kubernetes and CUE ecosystems, several internal components demonstrate high craftsmanship and potential for reuse.
The LLM identified 5 files worth highlighting for reuse:
Portable directory copy utility that preserves symlinks, follows symlinks up to a configurable depth, detects cycles, and enforces a maximum number of entries. Supports ignore patterns via a .gitignore-style file and requires no external dependencies beyond the standard library. Could be extracted and reused in any Go project requiring safe recursive directory copying.
Builds CUE value overlays by creating in-memory virtual filesystems from Go structs (e.g., values, schemas) and merging them into a CUE build context. This pattern allows injecting configuration without modifying source files on disk, enabling clean separation of user values from module defaults. The approach is non-trivial due to CUE's virtual filesystem APIs and is reusable for any CUE-based configuration system.
Manages Cosign subprocesses for signing and verifying OCI artifacts, handling key and keyless modes with ephemeral Docker configuration files. Isolates the complex interaction with Cosign binary (stdout, stderr, exit codes) behind a clean Go interface. This component could be reused in any Go application needing Cosign signing capabilities without requiring direct library dependencies.
Masks sensitive data (Secret resources) in rendered Kubernetes manifests by replacing all `data` and `stringData` field values with `***`. Simple, focused, and dependency-free logic that can be trivially reused in any YAML/JSON processing tool to prevent accidental secrets exposure in output or logs.
Implements automated version updates in CUE bundle files by parsing the CUE AST, resolving module versions from OCI registries using semver policies, rewriting string literals at exact byte offsets, and verifying the updated bundle compiles. Uses atomic writes with rollback. This pattern demonstrates non-obvious CUE AST manipulation and is reusable for any tool that needs to programmatically update version fields in CUE configuration files.