zalfmas-capnp-schemas 0.1.67

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zalfmas-capnp-schemas

Containerized Cap'n Proto schema compiler with C++, C#, Go, Python, and capnp-offset support.

Build image

docker build -t capnp-gen .

Optional build arguments:

• CAPNP_VERSION (default 1.2.0)
• JOBS (parallel make jobs, default 6)
• CAPNPC_GO_PKG (Go plugin module path)
• CAPNPC_GO_VERSION (default v3.1.0-alpha.2)

Example:

docker build --build-arg CAPNP_VERSION=1.2.0 --build-arg JOBS=12 -t capnp-gen .

Basic usage

The image ENTRYPOINT is: python3 capnp_compile.py Default CMD: --lang c++ go csharp python capnp_offsets

docker run --rm -u $(id -u):$(id -g) \
  -v "$(pwd)":/workspace -w /workspace capnp-gen

Explicit (C++ + Go):

docker run --rm -u $(id -u):$(id -g) \
  -v "$(pwd)":/workspace -w /workspace capnp-gen --lang c++ go

Notes

• Schemas must be available inside the mounted workspace (default: current directory).
• Generated code is written relative to /workspace (your mounted directory).
• capnpc-go is on PATH (installed in /usr/local/bin).
• Go generation maintains a single module rooted at gen/go.
• gen/go/go.mod is preserved by the generator, and go mod tidy runs automatically after Go regeneration to refresh go.sum.
• Adjust UID/GID mapping with -u to avoid root-owned outputs.

Updating Go plugin only

Rebuild with a different CAPNPC_GO_VERSION:

docker build --build-arg CAPNPC_GO_VERSION=v3.0.0 -t capnp-gen .