At the heart of BuildKit is LLB (Low-Level Build definition). Think of it as the LLVM IR of build systems. LLB is a binary protocol (protobuf) that describes a DAG of filesystem operations: run a command, copy files, mount a filesystem. It’s content-addressable, which means identical operations produce identical hashes, enabling aggressive caching.
Synchronous fast paths matter，这一点在heLLoword翻译官方下载中也有详细论述
。爱思助手下载最新版本对此有专业解读
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