Additional build instructions

[Sjors]

It's not very clear currently how to build this.

The instructions here only describe dependencies, but not the actual build process: https://github.com/Blockstream/greenlight/tree/main/libs/gl-client-py

After looking through some other issues and trial and error, I think you need to do (tried with PyEnv, and avoiding virtual env stuff):

cd libs/gl-client-py
maturin build
cd ../..
cd target/wheels
pip3 install target/wheels/*.whl
cd ../../tools/glcli
pip install .

For general sanity it would be nice if there was a way to just build the Rust application and avoid Python environment hell.

[arcadeJHS]

Same here.
I was trying to install the library on a Mac M2, in a Docker instance, using the imagepython:3.10-slim, which (I am not sure) is not yet a supported platform.

So i built it from source.

In addition to the dependencies listed here https://github.com/Blockstream/greenlight/tree/main/libs/gl-client-py, I also had to install protobuf-compiler.

The following is the significant part of my Dockerfile:

FROM python:3.11-slim

# Install dependencies
RUN apt-get update && \
    apt-get install -y \
    curl \
    build-essential \
    git \
    pkg-config \
    libssl-dev \
    libgmp-dev \
    libsqlite3-dev \
    libtool \
    valgrind \
    protobuf-compiler

# Install Rust
RUN curl https://sh.rustup.rs -sSf | sh -s -- -y
ENV PATH="/root/.cargo/bin:${PATH}"

# Install maturin
RUN pip install --no-cache-dir maturin
ENV PATH="/root/.local/bin:${PATH}"

# Manually build and install gl-client Python binding and glcli tool
RUN git clone https://github.com/Blockstream/greenlight.git && \
    cd greenlight/libs/gl-client-py && \
    maturin build && \
    cd greenlight/libs/gl-cli && \
    maturin build && \
    pip install /greenlight/target/wheels/gl*.whl