Reducto

Reducto is a high-performance, distributed build cache designed to cut CI build times by 30–80% through deterministic, content-addressable artifact storage and cross-job/branch reuse.

Think of it as a language-agnostic, S3-backed, build artifact cache with adapters for your favorite tools and CI systems.

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🚀 Goals

• Speed up builds by reusing outputs across jobs, branches, and CI runs.
• Be language/tool agnostic via adapters for Node, Rust, Docker, Java, Python, Go, and more.
• Integrate easily with GitHub Actions, GitLab, Jenkins, and other CI platforms.
• Be cloud-portable — works with S3, MinIO, GCS, Azure Blob, or local disk.

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🔑 Core Concepts

• Cache Key — Deterministic hash of all build inputs:
  SHA256(build_tool_version, os/arch, env_matrix, dependency_lock, source_fingerprints, build_flags, secrets_salt)
• Artifact Manifest — JSON metadata describing produced files, digests, sizes, and related tool metadata.
• CAS Objects — Stored by digest (SHA256), optionally zstd-compressed and split into 4–32 MiB chunks for resumable I/O.

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📌 Status

Early development — no code yet.

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